Opinion
Petitioner Prudential-LMI Commercial Insurance (Prudential) and real parties in interest (plaintiffs) each seek review of a Court of Appeal decision issuing a writ of mandate directing summary judgment in favor of Prudential. The action involves progressive property damage to an apartment house owned by plaintiffs and insured over the years by successive insurers, including Prudential. We granted review to address three issues: (i) when does the standard one-year limitation period (hereafter one-year suit provision) contained in all fire policies (pursuant to Ins. Code, § 2071) 1 begin to run in a progressive property damage case; (ii) should a rule of equitable tolling be imposed to postpone the running of the one-year suit provision from the date notice of loss is given to the insurer until formal denial of the claim; and (iii) when there are successive insurers, who is responsible for indemnifying the insured for a covered loss when the loss is not discovered until several years after it commences? The last issue can be resolved by placing responsibility on (a) the insurer insuring the risk at the time the damage began, (b) the insurer insuring the risk at the time the damage manifested itself, or (c) all insurers on the risk, under an allocation (or exposure) theory of recovery.
As explained below, we hold that the one-year suit provision begins to run on the date of inception of the loss, defined as that point in time when appreciable damage occurs and is or should be known to the insured, such that a reasonable insured would be aware that his notification duty under the policy has been triggered. We also hold that this limitation period should be equitably tolled from the time the insured files a timely notice, pursuant to policy notice provisions, to the time the insurer formally denies the claim in writing. In addition, we conclude that in a first party property damage case (i.e., one involving no third party liability claims), the carrier *679 insuring the property at the time of manifestation of property damage is solely responsible for indemnification once coverage is found to exist.
As we explain further below, we emphasize that our holding is limited in application to the first party progressive property loss cases in the context of a homeowners insurance policy. As we recognized in
Garvey
v.
State Farm Fire & Casualty Co.
(1989)
Background
1. The Policy
Plaintiffs, as trustees of a family trust, built an apartment house in 1970-1971 and insured it with four successive fire and extended coverage property insurers between 1971 and 1986. Prudential insured the risk between October 27, 1977, and October 27, 1980. It issued an all-risk homeowners policy which insured against “All Risks of Direct Physical Loss except as hereinafter excluded.” The policy insured for both property loss and liability.
As noted above, we are concerned here only with the first party property loss portion of plaintiffs’ policy. It insured against all risks of direct physical loss subject to the terms and conditions set forth in the policy, which provided definitions and general policy provisions explaining to the insured the coverages and exclusions of the policy. The specified exclusions included loss “caused by, resulting from, contributed to or aggravated by any earth movement, including but not limited to earthquake, mudflow, earth sinking, rising or shifting; unless loss by fire or explosion ensues, and this Company shall then be liable only for such ensuing loss.”
The policy contained several standard provisions adopted from the “California Standard Form Fire Insurance Policy” and section 2071, entitled “Requirements in case loss occurs.” The provisions in relevant part required the insured to: “give written notice . . . without unnecessary delay, protect the property from further damage . . . and within 60 days after the loss, unless such time is extended in writing by this company, the insured shall render to this company a proof of loss, signed and sworn to by the insured, stating the knowledge and belief of the insured as to the following: the time and origin of the loss, [and] the interest of the insured and all others in the property . . . .” In the same section of the policy, the *680 provision entitled “When loss payable” required the insurer to pay the amount of loss for which the company may be liable “60 days after proof of loss ... is received by this company and ascertainment of the loss is made whether by agreement between the insured and this company expressed in writing or by the filing with this company of an award as [otherwise provided in the policy—i.e., pursuant to the policy arbitration and appraisal provisions].”
Plaintiffs’ рolicy also contained the standard one-year suit provision first adopted by the Legislature in 1909 as part of the “California Standard Form Fire Insurance Policy.” (See §§ 2070, 2071.) It provided: “No suit or action on this policy for the recovery of any claim shall be sustainable in any court of law or equity unless all the requirements of this policy shall have been complied with, and unless commenced within 12 months next after inception of the loss.” 2 With this background in mind, we turn to the facts underlying this claim.
2. The Facts
While replacing the floor covering in an apartment unit in November 1985, plaintiffs discovered an extensive crack in the foundation and floor slab of the building. In December 1985, they filed a claim with their brokers, who immediately notified Prudential and the other companies that had issued insurance policies on the property during plaintiffs’ period of ownership. Prudential conducted an investigation of the claim, which included an examination under oath of plaintiffs in February 1987. Prudential concluded the crack was caused by expansive soil that caused stress, rupturing the foundation of the building. In August 1987, shortly before receiving formal written notice that their claim had been denied under the policy’s eаrth movement exclusion, 3 plaintiffs sued Prudential, the three other insur *681 ers that had insured the property between 1971 and 1986, and their insurance brokers or agents, alleging theories of breach of contract, bad faith, breach of fiduciary duties and negligence.
Prudential sought summary judgment and, alternatively, summary adjudication of 16 issues arising out of the complaint, contending there was no evidence any loss was suffered during its policy period and hence it could not be required to indemnify plaintiffs. Prudential observed that carpeting had been installed in 1982, covering the area later damaged, but asserted that at the time of installation (nearly two years after Prudential’s coverage had ended), plaintiffs observed no damage or evidence of cracking. Prudential also claimed that because plaintiffs filed suit 20 months after filing their claim, the action was barred by the standard one-year suit provision contained in its policy, pursuant to section 2071.
The court denied the motion in its entirety, stating that triable issues existed as to whether the earth movement exclusion applied, whether the damage occurred during the policy period, and when the crack first appeared. Prudential sought a writ of mandatе to review the denial of the motion, arguing only that the action was time-barred because plaintiffs failed to comply with the policy’s notice-of-claim requirement and one-year suit provision.
The Court of Appeal issued a peremptory writ of mandate directing the trial court to vacate its order denying the insurer’s summary judgment motion and to enter another order granting the relief requested. In so holding, the court adopted a “delayed discovery” rule: The one-year suit provision begins to run when damage to property is sufficient to put a reasonable person on notice of the possibility of property loss. It determined that a delayed discovery rule must be applied to the policy requirement that a claim be made without unnecessary delay. The court explained that to rule otherwise would require claimants to pursue their rights under the policy even if still “blamelessly ignorant” of the objective facts underlying the claim. (See also, e.g.,
April Enterprises, Inc.
v.
KTTV
(1983)
Thus, the policy requirement of notice of loss without unnеcessary delay, and the further provision calling for the commencement of suit within 12 months from the “inception of the loss,” were relaxed in cases of continuous and progressive loss by the application of a delayed discovery rule. The court based its reasoning on the fact that progressive property loss can occur and cause damage long before its discovery by the insured.
*682 After adopting the delayed discovery rule, however, the Court of Appeal held that plaintiffs were nonetheless too late in filing their action under the one-year suit provision. The court explained that although factual issues remained unresolved as to whether plaintiffs’ failure to earlier discover the damage to the property was reasonable, the issue need not be resolved because plaintiffs failed to bring their action on the policy within the limitations period of 12 months after “a reasonable person” would have been placed on notice of property damage.
Next, the Court of Appeal noted that in property cases involving progressive loss, the period over which the damage took place may have occurred within one or several policy periods. The court reasoned that because it is often difficult to detect progressive property loss and such damage may occur over several policy periods without detection, equity demands an apportionment of damages between those insurers on the risk during the entire period the damage progressed. The court discussed two cases we examine further below:
Home Ins. Co.
v.
Landmark Ins. Co.
(1988)
Discussion
1. Section 2071: One-year Suit Provision—History of the Limitations Period
Under California law, all fire insurance policies must be on a standard form and, except for specified exceptions, may not contain additions thereto. (§ 2070.) This standard form provides that no suit or action for recovery of any claim shall be sustainable unless commenced within 12 months after the “inception of thе loss.” (§ 2071.) Section 2071 was adopted by the Legislature in 1909 (with a 15-month suit provision) as part of the “California Standard Form Fire Insurance Policy.” The provision was amended in 1949 to reflect the nearly uniform adoption (by 45 states at the time) of a 1-year limitations period in the “Model New York Standard Fire Form Policy.” (Sen. Bill No. 1282 (1949 Reg. Sess.); see Sen. Insurance Com. Rep. to Governor (May 24, 1949).)
The one-year suit provision was first adopted by the New York Legislature (in 1887 and again in 1918) to prevent fraudulent fire claims.
(Proc
v.
*683
Home Ins. Co.
(1966)
California’s version of the model New York policy, section 2071, has remained substantially unchanged since its amendment in 1949. The only significant modification occurred in the 1988 adoption of section 2070.1, which requires insurance companies to notify insureds, in writing, at least 30 days before expiration of the one-year suit provision, of the statute’s applicability to the insured’s claim in corrosive soil loss cases. Under section 2070.1, failure to provide such written notice results in an automatic tolling of the limitations period of 30 days from the date the written notice is actually provided. Section 2071.1 also provides that notice of the statute of limitations is not necessary if the insured is represented by an attorney. The provision is applicable only to corrosive soil loss claims presented and not denied prior to January 1, 1989, and to claims presented on or after that date.
The validity of the statutory limitations period was discussed in
C & H Foods Co.
v.
Hartford Ins. Co.
(1984)
When a clause in an insurance policy is authorized by statute, it is deemed consistent with public policy as established by the Legislature.
(Jensen
v.
Traders & General Ins. Co.
(1959)
2. Delayed Discovery and Inception of the Loss
The purpose of a statute of limitations is “ ‘to promote justice by preventing surprises through the revival of claims that have been allowed to slumber until evidence has been lost, memories hаve faded, and witnesses have disappeared. The theory is that even if one has a just claim it is unjust not to put the adversary on notice to defend within the period of limitation and the right to be free of stale claims in time comes to prevail over the right to prosecute them.’ ”
(Bollinger, supra,
25 Cal.2d at pp. 406-407, quoting
Order of Railroad Telegraphers
v.
Railway Express Agency
(1944)
Although the concept of a standard policy was intended to provide policyholders with a clear indication of their duties under the policy, courts have not uniformly agreed when the limitation period begins to run in cases involving property damage not discovered until years after damage actually occurs. All courts recognize, however, that determination of when the statute of limitations period commences depends on the interpretation of the phrase “inception of the loss” in section 2071.
Some courts, strictly construing “inception of the loss,” define it as the occurrence of the physical event causing the loss. (See Annot., Validity of Contractual Time Period, Shorter Than Statute of Limitations, for Bringing Action (1966)
California courts have more leniently interpreted the provision in property loss cases not involving fire. In
Zurn Engineers
v.
Eagle Star Ins. Co.
(1976)
As the present Court of Appeal observed, the
Zurn
court confined its holding to the context of the policy and factual situation in that case.
(Zurn, supra,
Several first party cases have acknowledged support for a delayed discovery rule that holds an insured responsible for initiating a claim based on the date on which the insured could reasonably have concluded his property suffered a loss. These cases agree that the term “inception of the loss” means that point in time at which appreciable damage occurs so that a reasonable insured would be on notice of a potentially insured loss. For example, in
Lawrence
v.
Western Mutual Ins. Co.
(1988)
Next, in
Abari
v.
State Farm Fire & Casualty Co.
(1988)
The
Abari
court ruled in favor of the insurer. The court emphasized thаt in first party property loss cases, it is the occurrence of some cognizable event rather than knowledge of its legal significance that triggers the insured’s notice duties under the policy. The court believed that the insured reasonably could have found the cracks so trivial that he would not have been alerted to the gravity of the damage.
(Abari, supra,
We agree that “inception of the loss” should be determined by reference to reasonable discovery of the loss and not necessarily turn on the occurrence of the physical event causing the loss. Accordingly, we find that California law supports the application of the following delayed discovery rule for purposes of the accrual of a cause of action under section 2071: The insured’s suit on the policy will be deemed timely if it is filed within one
*687
year after “inception of the loss,” defined as that point in time when appreciable damage occurs and is or should be known to the insured, such that a reasonable insured would be aware that his notification duty under the policy has been triggered. To take advantage of the benefits of a delayed discovery rule, however, the insured is required to be diligent in the face of discovered facts. The more substantial or unusual the nature of the damage discovered by the insured (e.g., the greater its deviation from what a reasonable person would consider normal wear and tear), the greater the insured’s duty to notify his insurer of the loss promptly and diligently. (See, e.g.,
April Enterprises, Inc.
v.
KTTV, supra,
Determining when appreciable damage occurs such that a reasonable insured would be on notice of a potentially insured loss is a factual matter for the trier of fact. The insured’s unreasonableness in delaying notification of the loss until a particular point in time may be raised as a separate affirmative defense by an insurer in response to a complaint by the insured for recovery of benefits under the policy. The insurer has the burden of proving those allegations by a preponderance of the evidence. (See, e.g.,
Olson
v.
Standard Marine Ins. Co.
(1952)
In this case, plaintiffs’ policy required notice of loss to be given “without unnecessary delay,” and proof of loss to be filed within 60 days of the loss. A factual question remains as to the properly calculated accrual date under the delayed discovery principles announced above. Plaintiffs therefore should be allowed to amend their complaint to allege facts showing their discovery of the loss was reasonable.
3. Doctrine of Equitable Tolling
Our inquiry does not end with adoption of a delayed discovery rule. After filing their notice of loss, plaintiffs waited more than 18 months to file the present action. Thus, even under our delayed discovery rule, the one-year suit provision would, unless otherwise inapplicable or excused, bar plaintiffs from pursuing the present action. The seemingly anomalous conclusion— that an insured must file a lawsuit before the insurer has completed its investigation and denied the claim—has been questioned in other jurisdictions that have the identical statutory scheme as California.
Two divergent views have developed. Several state courts have strictly interpreted the standard limitation clauses.
(Naghten
v.
Maryland Casualty Company, supra,
197 N.E.2d at pp. 490-492 [dismissed claim, for loss
*688
caused by pressure of underground water, based on one-year suit provision in homeowner’s policy];
Proc, supra,
Other state courts have devised rules to equitably toll the limitation period until an insurer’s formal denial of the claim by the insured. The leading case for this view is
Peloso
v.
Hartford Fire Insurance Co., supra,
The facts of
Peloso
illustrate the anomalous result that would fоllow a literal interpretation of the one-year suit provision. The insured’s building and its contents sustained damage from a fire on the premises, and he gave the insurer prompt notice of the fire. The insurer denied the claim nine months after the loss, but the insured waited approximately nine more months before instituting suit for coverage under the policy. He argued his suit was timely because the statute of limitations did not begin to run until liability was formally denied. After the trial court granted the insurer’s summary judgment motion on the one-year suit provision, the New Jersey Supreme Court reversed, holding that the “fair resolution of the statutory incongruity is to allow the period of limitation to run from the date of the casualty but to toll it from the time an insured gives notice until liability is formally declined.”
(Peloso, supra,
The
Peloso
court recognized that although the limitation period purports to provide the insured with one year in which to institute suit, other policy provisions greatly affect what occurs during this period. As
Peloso
observed, “the central idea of the limitation provision was that an insured [had] 12 months to commence suit.” (
Other states have followed Peloso's lead. (See, e.g.,
Ford Motor Co.
v.
Lumbermens Mut. Cas. Co.
(1982)
*689 In addition, as the parties observe, a few states have enacted statutes that expressly extend the one-year limitation provision. New York recently extended its suit provision to twenty-four months. (N.Y. Ins. Law § 168 (McKinney Supp. 1982-1983).) Illinois enacted a statutory tolling provision that states: “Whenever any policy or contract for insurance . . . contains a provision limiting the period within which the insured may bring suit, the running of such period is tolled from the date proof of loss is filed, in whatever form is required by the policy, until the date the claim is denied in whole or in part.” (Ill. Rev. Stat. ch. 73, 755.1; see also Mass. Ann. Laws ch. 175, § 22 (1977) [limitation period runs two years from time cause of action accrues]; Me. Rev. Stat. Ann. tit. 24-A, § 2433 (1969) [two years from time cause of action accrues against foreign insurers]; see Reader & Polk, The One-Year Suit Limitation In Fire Insurance Policies: Challenges and Counterpunches (Fall 1983) 19 Forum 24, 26-28.)
Early California cases tоok inconsistent approaches to the issue. (Compare
Case
v.
Sun Insurance Co.
(1890)
More recent cases have applied the equitable doctrines of waiver and estoppel to allow a suit filed after the limitation period expired to proceed. It is settled law that a waiver exists whenever an insurer intentionally relinquishes its right to rely on the limitations provision.
(Elliano
v.
Assurance Co. of America
(1970)
For example, if the insurer expressly extends the one-year suit provision during its claim investigation, the insurer waives its right to raise a timeliness defense to the insured’s action.
5
(Elliano, supra,
3 Cal.App.3d at pp. 452-453.) Similarly, an insurer that leads its insured to believe that an amicable adjustment of the claim will be made, thus delaying the insured’s suit, will be estopped from asserting a limitation defense. (See, e.g.,
Benner
v.
Industrial Acc. Com.
(1945)
By contrast, equitable tolling has most often been applied in California when the plaintiff first files a claim before an administrative agency and then files a second proceeding after the limitation period has expired. Under these circumstances, courts have held the policy underlying the statute of limitations—prompt notice to permit complete and adequate defense—has been satisfied and that the period should be tolled in equity to preserve the plaintiff’s claim.
(Collier
v.
City of Pasadena
(1983)
One commentator has called it “unconscionable” to permit the limitation period to run while the insured is pursuing its rights in the claims process. (18A Couch, Insurance (2d ed. 1983) § 75:88, at pp. 99-100.) Couch also observes that some jurisdictions have tolled the limitation period until the expiration of the 60-day waiting period following the filing of formal proofs of loss. (Id., § 75:91, at p. 106.) This approach effectively allows the insured *691 an additional two months, or a total of fourteen months, to bring his lawsuit.
Another commentator has suggested that insurers be required to give special notice to insured claimants of the running of the limitation period during the claims process. (20A Appleman, Insurance Law and Practice (1980) § 11601, pp. 435-436.) Appleman notes that, as a practical matter, the insured is usually unaware of and would not reasonably expect such a short limitation period to run while his insurer is still examining the claim. (Ibid.)
Like the
Peloso
court, we conclude the Legislature’s intent to provide insureds with a full year (excluding the tolled period) in which to commence suit can be inferred from the fact that the period provided by section 2071 is considerably shorter than the usual four years for ordinary contracts (Code Civ. Proc., § 337) and ten years for an action against developers for property damage caused by latent defects.
(Id.,
§ 337.15;
Peloso, supra,
4. Policy Considerations
Persuasive policy considerations support equitable tolling of the limitations period: Prudential suggests that suspension of the one-year suit provision during the time the insurer investigates the loss will frustrate the provision’s primary purpose of preventing the revival of stale claims. (See
Elkins
v.
Derby
(1974)
*692
Moreover, the principle of equitable tolling presents several advantages in eliminating the unfair results that often occur in progressive property damage cases. First, it allows the claims process to function effectively, instead of requiring the insured to file suit
before
the claim has been investigated and determined by the insurer. Next, it protects the reasonable expectations of the insured by requiring the insurer to investigate the claim without later invoking a technical rule that often results in an unfair forfeiture of policy benefits. Although an insurer is not required to pay a claim that is not covered or to advise its insureds concerning what legal arguments to make, good faith and fair dealing require an insurer to investigate claims diligently before denying liability. (See, e.g.,
California Shoppers, Inc.
v.
Royal Globe Ins. Co.
(1985)
Equitable tolling is also consistent with the policies underlying the claim and limitation periods—e.g., the insurer is entitled to receive prompt notice of a claim and the insured is penalized for waiting too long after discovery to make a claim. For example, if an insured waits 11 months after discovering the loss to make his claim, he will have only 1 month to file his action after the claim is denied before it is time-barred under section 2071. (See e.g.,
Peloso, supra,
Finally, the anomaly caused by a literal application of the one-year suit provision is demonstrated by the facts of this case. Plaintiffs allege they notified Prudential of their loss in December 1985, one month after it was discovered. Assuming this delayed discovery was reasonable, they then had 60 days to file a proof of loss and Prudential had another 60 days to dеtermine liability under the policy. During this time, any suit on the policy filed by plaintiffs would have been premature. (See
Bollinger, supra,
We conclude that proper resolution of the foregoing anomaly is to allow the one-year suit provision of section 2071 to run from the date of “inception of the loss,” as defined above, but to toll it from the time an insured gives notice of the damage to his insurer, pursuant to applicable policy notice provisions, until coverage is denied. As
Peloso, supra,
In the present case, plaintiffs allege that approximately one month had elapsed between the date the loss was discovered and the date notice thereof was given to Prudential. As stated above, we conclude plaintiffs should be allowed to amend their complaint to allege facts showing their action was filed within one year of their delayed discovery of the loss. If, on remand, it is determined that the delayed discovery of the loss was reasonable, the one-year suit provision would be tolled from December 1985 until September 1987, when plaintiffs were notified by Prudential that coveragе was denied. Plaintiffs would then have had 11 months to institute suit against Prudential, so that any suit filed before September 1988 would be considered timely.
5. Progressive Loss Rule
We next examine allocation of indemnity between successive first party property insurers when the loss is continuous and progressive throughout successive policy periods, but is not discovered until it becomes appreciable, for a reasonable insured to be aware that his notification duty under the policy has been triggered. Although the Court of Appeal here held that plaintiffs’ claim was time-barred under section 2071, it observed in dictum that apportionment of damages between all insurers who insured the risk during the time of the development of the injury would be the “equitable result.” The court based its reasoning on a line of cases applying the “continuous exposure theory” of loss allocation, which apportions payment between those insurers whose policies insured the risk during the *694 period from the date when damage first occurred to the date of its discovery by the insured. 6
The foregoing theory was first announced in the context of a third party construction defect case
(Gruol Construction Co.
v.
Insurance Co. of North America
(1974)
Prudential argues that even assuming the applicable one-year suit provision does not bar the suit, it should not be responsible for any covered loss because plaintiffs presented no evidence that a loss was suffered during the period of its policy term (Oct. 27, 1977, to Oct. 27, 1980). It also asserts that because its policy period ended in 1980—five years before the damage was allegedly discovered by plaintiffs—it should not be responsible for indemnification of
any
covered loss. Prudential asks the court to adopt a “manifestation rule” of property coverage that fixes liability for first party property losses solely on the insurer whose policy was in force at the time the progressive damage became appreciable or “manifest.” (See
Home Ins. Co., supra,
The Manifestation and Exposure Theories
The first case to discuss a manifestation theory in the first party property context was
Snapp
v.
State Farm Fire & Cas. Co.
(1962)
The loss “materialized” and thus became “ascertainable” during State Farm’s policy period and continued to progress after the policy term expired. (Sn
app, supra,
The court rejected this argument, however, and held that although the loss may have been “inevitable,” such inevitability did not alter the fact that “at the time the contract of insurance was entered into, the event was only a
contingency
or
risk
that might or might not occur within the term of the policy.”
(Snapp, supra,
State Farm next asserted that even assuming it was responsible for the loss, its liability became “terminable” on the date its policy expired and therefore it was not liable for the “continuing damage or loss” after expiration. (S
napp, supra,
Next, in
Sabella
v.
Wisler
(1963)
The next California case to address the problems arising in progressive property damage cases presented the issue of which carrier should indemnify insureds for a loss that occurred over two separate policy periods. In
California Union Ins. Co., supra,
Because the case involved liability policies, the Court of Appeal relied on three out-of-state liability cases that had apportioned payment between successive insurers when the damage or injury had continued, during the separate policy periods. One case involved construction damage
(Gruol Construction Co.
v.
Insurance Co. of North America, supra,
The
California Union Ins. Co.
court determined that it was faced with a “one occurrence” case, involving continuous, progressive and deteriorating damage, notwithstanding the fact that new damage occurred to the pool after certain repairs had been made
(California Union Ins. Co., supra,
In
Home Ins. Co., supra,
The Court of Appeal affirmed, holding that the “date of manifestation determines which carrier must provide indemnity for a loss suffered by its
*698
insured.”
(Home Ins. Co., supra,
Because
California Union Ins. Co., supra,
*699 As stated by the Home Ins. Co. court, the manifestation rule in the first party context “promotes certainty in the insurance industry and allows insurers to gauge premiums with greater accuracy. Presumably this should reduce costs for consumers because insurers will be able to set aside proper reserves for well-defined coverages and avoid increasing such reserves to cover potential financial losses caused by uncertainty in the definition of coverage.” (Home Ins. Co., supra, 205 Cal.App.3d at pp. 1395-1396.)
Based on the reasoning set forth in Snapp, Sabella and Home Ins. Co., we conclude that in first party progressive property loss cases, when, as in the present case, the loss occurs over several policy periods and is not discovered until several years after it commences, the manifestation rule applies. As stated above, prior to the manifestation of damage, the loss is still a contingency under the policy and the insured has not suffered a compensable loss. (Snapp, supra, 206 Cal.App.2d at pp. 831-832.) Once the loss is manifested, however, the risk is no longer contingent; rather, an event has occurred that triggers indemnity unless such event is specifically excluded under the policy terms. Correspondingly, in conformity with the loss-in-progress rule, insurers whose policy terms commence after initial manifestation of the loss are not responsible for any potential claim relating to the previously discovered and manifested loss. Under this rule, the reasonable expectations of the insureds are met because they look to their present carrier for coverage. At the same time, the underwriting practices of the insurer can be made predictable because the insurer is not liable for a loss once its contract with the insured ends unless the manifestation of loss occurred during its contract term. (Id. at p. 832.)
One final question must be addressed regarding the application of a manifestation rule of coverage in progressive loss cases: how does the rule relate to our rules of delayed discovery and equitable tolling announced above? We have previously defined the term “inception of the loss” as that point in time when appreciable damage occurs and is or should be known to the insured, such that a reasonable insured would be aware that his notification duty under the policy has been triggered. We conclude that the definition of “manifestation of the loss” must be the same. Under this standard, the date of manifestation and hence the date of inception of the loss will, in many cases, be an issue of fact for the jury to decide. When, however, the evidence supports only one conclusion, summary judgment may be appropriate. For example, when the undisputed evidence establishes that no damage had been discovered before a given date (i.e., no manifestation occurred), then insurers whose policies expired prior to that date could not be liable for the loss and would be entitled to summary judgment. The litigation can then be narrowed to include only the insurers whose policies were in effect when the damage became manifest.
*700 Conclusion
Based on the principles discussed above, we conclude plaintiffs should be allowed to amend their complaint to allege that their delayed discovery of the loss at issue was reasonable, and that they timely notified Prudential of the loss without unnecessary delay following its manifestation. If it is found that plaintiffs’ delayed discovery of the loss was reasonable, then the rule of equitable tolling would operate to toll the one-year suit provision from the date the insured filed a timely notice of loss to Prudential’s formal denial of coverage. Whether Prudential must then indemnify plaintiffs for any covered claim under the policy necessarily depends on whether that insurer was the carrier of record on the date of manifestation of the loss. Although it appears from the present record that manifestation of loss occurred in November 1985, after Prudential’s policy had expired, we note that plaintiffs have joined other insurers in the litigation. Therefore, in the absence of conclusive evidence, we decline to speculate concerning the date manifestation of loss occurred. The decision of the Court of Appeal is reversed and the cause remanded for proceedings consistent with our opinion.
Mosk, J., Broussard, J., Panelli, J., Eagleson, J., Kennard, J., and Arabian, J., concurred.
On December 13, 1990, the opinion was modified to read as printed above.
Notes
All further statutory references are to the Insurance Code unless otherwise noted.
We note plaintiffs’ policy contained an additional provision termed “Suit or Action Agаinst the Company.” That provision read: “No suit or action on this policy for the recovery of any claim shall be sustainable in any court of law or equity unless the insured shall have fully complied with all the requirements of this policy, nor unless commenced within twelve (12) months next after the happening of the loss, unless a longer period of time is provided by applicable statute of the state wherein this policy is issued.” This modified version of the standard one-year suit provision is incorporated into many policy forms currently in use and recognizes that some states have adopted two-year limitation periods. (Cal. Insurance Law and Practice (Matthew Bender 1989) § 36.67, “Suit Against Us” at pp. 64-65.) We perceive no legal difference between “inception” and “happening” for purposes of resolving the questions presented.
Whether the loss was the result of a covered peril was not a ground of the petitions for review, nor was it argued or adequately briefed in either the Court of Appeal or this court. Accordingly, we do not address material coverage issues, leaving causation to be determined in the appropriate forum. (See
Garvey
v.
State Farm Fire & Casualty Co., supra,
Similarly, in applying California law, the United States District Court for the Northern District of California upheld a strict application of the one-year suit provision in a homeowners policy to bar the insured’s suit against the insurer where there was no evidence the insureds were prevented from timely bringing their claim within twelve months of the policy’s termination.
(Stinson
v.
Home Ins. Co.
(N.D.Cal. 1988)
As amicus curiae observe, however, similar conduct by the insurer
after
the limitation period has run—such as failing to cite the limitation provision when it denies the claim, failing to advise the insured of the existence of the limitation provision, or failing to specifically plead the time bar as a defense—cannot, as a matter of law, amount to a waiver or estoppel. (See, e.g.,
Becker
v.
State Farm Fire and Cas. Co.
(N.D.Cal. 1987)
Amici curiae Mid-America Legal Foundation, Pfizer, Inc., W. R. Grace & Co., Keene Corp., McKesson Corp., GenCorp, and Rhеem Manufacturing Co., have filed a request for judicial notice pursuant to Evidence Code sections 452, subdivision (d), and 459. The request involves several briefs and other supporting papers filed on behalf of different parties in various stages of litigation in different state and federal courts. Because we do not find the information necessary to our decision, we deny the request.
The loss-in-progress rule codifies a fundamental principle of insurance law that an insurer cannot insure against a loss that is known or apparent to the insured. (See
Bartholomew
v.
Appalachian Ins. Co.
(1st Cir. 1981)
Home Ins. Co., supra,
