This is an appeal by Balboa Insurance Company from an adverse summary judgment rendered against it on a surety bond and in favor of the obligee on the bond, K & D and Associates. K & D and Associates, a general contractor, sued P & L Construction Enterprises, Inc., its framing and carpentry subcontractor, and P & L’s surety, Balboa, for losses sustained by K & D when P & L abandoned the job. Judgment was entered against P & L for the total amount of the loss and against Balboa to the extent of its bond. Only Balboa appeals.
On appeal, Balboa contends that the trial court erred in rendering summary judgment as to liability 1 because: (1) the language of the bond and documents relating thereto are ambiguous with respect to thе bonded obligation, thus creating a fact issue as to the intent of the parties; (2) there was a mutual mistake in the language of the bond; (3) Balboa has been discharged under its bond because of material alterations to the bonded subcontract; (4) no default ocсurred under the letter of intent, which K & D contends was the bonded indebtedness; and (5) Balboa has been discharged by reason of a novation arising from the execution by K & D and P & L of two subcontracts after the letter of intent which K & D asserts is the bonded indebtedness. Because we find no merit in these contentions, we affirm.
The relevant facts are undisputed. K & D had a contract with the United States Air Force to build two hundred houses at Sheppard Air Force Base. On November 22, 1974, K & D and P & L Construction Enterprises signed a document designated “Letter of Intent” by which P & L agreed to perform the carpentry subcontract work. This document consisted of five pagеs and set forth in some detail the work to be done. The “Letter of Intent,” contemplated another contract for the work to be executed since it provided: “It is agreed that the printed form in blank hereto attached, the printed terms and conditions of which is аcceptable, is the form to be used in the preparation of the subcontract, and that special clauses will be inserted as indicated by the attached sheet or sheets.” .The sheets were a formal A.I.A. contract form. It also stated: “The undersigned agrеe to execute a subcontract in accordance with this proposal.”
This letter of intent also required P & L to obtain a combination payment and performance bond in the amount of $378,200. Although P & L sought a bond in this sum, it was only able to obtain a bond for $200,-000 from Balboa naming P & L as principal and K & D as obligee. This was the mаximum amount permitted by Balboa to be written by the insurance agency through which P & L obtained the bond. The bond in the amount of $200,000 was issued and delivered to K & D on November 26, 1974, *756 four days after the “Letter of Intent” was signed. With respect to its obligations, the letter stated:
That the above bound Principal (P & L) has entered into a contract with K & D and Associates dated Novembеr 22, 1974, to do framing and carpentry work in connection with Federal Contract No. F41612 75 90011.
Thereafter, on December 26,1974, K & D and P & L entered into two formal subcontracts (using the blank printed form attached to the letter of intent), each of which required P & L to perform the carpentry work on 100 units for a lump sum of $189,100. Thus, taken together, each subcontract required P & L to do the work on 200 houses for $378,200, as set forth in the “letter of intent.” P & L commenced work on the 200 houses but defaulted and left the job on July 14,1975. K & D made demand on Balboa, as P & L’s surety, to complete the performance of the obligations undertaken by Balboa in aсcordance with its bond on November 26,1974. Balboa refused and K & D completed the project at a loss to it in excess of $200,000, the penal limit of the bond. This litigation ensued.
AMBIGUITY
Balboa asserts that the language of the letter of intent was ambiguous, creating a material fact issue as to the intent of the parties. However, it did not raise this point in its response to K & D’s motion for summary judgment. We cannot reverse a summary judgment on issues not presented to the trial judge by written motion for summary judgment, answer or other response. Tex.R.Civ.P. 166-A.
Moreover, as wе read the letter of intent and the bond, there is no ambiguity. The letter of intent, dated November 22, 1974, sets out in tedious detail the carpentry and framing work to be performed on 200 housing units. The bond specifically refers to the contract between K & D and P & L dated November 22 and to K & D’s government contract number. It is undisputed that no agreements other than the letter of intent between K & D and P & L were executed on November 22.
The construction of an unambiguous written instrument is a question of law for the court.
City of Pinehurst v. Spooner Addition Water Co.,
[the] standard of interpretation of an integration, except where it produces an ambiguous result, or is excluded by a rule of law establishing a definite meaning is the meaning that would be attached to the integration by a reasonably intelligent person acquainted with all operative usages and knowing all the circumstances prior to and contemporaneous with the making of the integration, other than oral statements by the parties of what they intended it to mean.432 S.W.2d at 518 . [Emphasis added].
Balboa has adduced deposition testimony as tо the subjective intent of the parties in executing the bond and letter of intent. This testimony does not raise a fact issue as to the intent of the parties and, indeed, is inadmissible under the parol evidence rule. Since the writing is unambiguous, the intent of the parties is objectively determined from its content, applying the Pinehurst standard. Deposition testimony of subjective intent is irrelevant and cannot raise a fact issue as to the intent of the parties in executing the bond and letter of intent. We find no merit in Balboa’s contentions as to ambiguity. Even if meritorious, we are required to reject them because they were not presented to the trial judge in response to K & D’s motion for summary judgment.
MUTUAL MISTAKE
Balboa next contends that it raised a material fact issue on its affirmative defense of mutual mistake, precluding summary judgment. Even though it was the non-movant, Bаlboa, who had the burden of raising a fact issue on all elements of its affirmative defense,
Torres v. Western Casu
*757
alty and Surety Co.,
Balboa’s mutual mistake defense was that the actual agreement was to bond the framing and carpentry work on 100 housing units rather than 200 units. In this respect Balboa asserts that it was only through some inadvertence that the written bond was not limited to 100 units. In order to establish this affirmative defensе by proper summary judgment evidence, Balboa had to establish that the agreement between P & L and Balboa was to bond the work on 100 units and that K & D knew of this agreement. The latter element must be established because a secret understanding between the principal and the surety cannot alter the legal effect of the bond.
Lloyds Casualty Insurer v. Farrar,
THE BONDED OBLIGATION
Next, Balboa contends that the bonded obligation was the first subcontract covering work on 100 housing units, and that its obligation as surety was discharged by expansion of the obligation to cover 200 units. We cannot agree and hold that the bonded obligation was the framing and carрentry work on all 200 housing units, as set forth in the “letter of intent.” Thus, it is unnecessary to discuss Balboa’s contentions that it was released by material alteration to the first 100 units subcontract.
The proper standard of construction of the bond and letter of intent is the interpretation of a reasonable man with knowledge of operative usage and surrounding circumstances.
City of Pinehurst,
*758 CONSTRUCTION OF THE LETTER OF INTENT
Balboa asserts that the letter of intent requirеd only the execution of subcontracts, not the performance of carpentry and framing work. Since P & L in fact executed the subcontracts, Balboa claims no event of default occurred under the letter of intent and thus it is not liable to K & D on the bond. This construction of Balboa’s obligation is untenable. It flies in the face of a reasonable construction of the bond to assert that the bonded obligation was the execution of a subcontract. In considering the circumstances surrounding the execution of the bond as authorized by
Pinehurst,
we judicially notice that the purpose of a surety bond for a construction subcontractor is to provide for performance of the subcontractor’s construction obligation if the subcontractor defaults. If Balboa’s interpretation of the letter of intent was adopted, then Balboa’s obligation under the $200,000 surety bond was discharged when P & L signed the subcontract.. Thus, K & D would have to rely solely on the credit of P & L to perform its obligation under the subcontract and the bond would fail in its essential purpose. Construing the letter of intent and bond together, the only reasonable interpretation is that the letter of intent obligated P & L to perform carpentry and framing work and that Balboa bonded P & L’s performance. Indeed, the letter of intent was complete in that it left nothing upon which the parties had not agreed. The fact that P & L and K & D termed the obligation a letter of intent rather than a. contract does not control the legal effect of their agreement.
Houston Chronicle Publishing Co. v. McNair Trucklease, Inc.,
DEFAULT UNDER THE LETTER OF INTENT
Balboa argues that the trial court erred in finding that P & L defaulted under the letter of intent and thus it is not liable on its bond. Balboa asserts that, “. . .a contract of suretyship will be strictly construed so as to impose on the surety only such burdens or obligations as clearly come within the terms of the contract, and such contract will not be extended by implication or presumption.”
Standard Accident Insurance Co. v. Knox,
NOVATION
Balboa next argues that execution of the two subcоntracts with essentially the same terms as the letter of intent is a novation that supersedes the letter of intent, thus releasing the surety. Balboa cites no authority to support this contention. The rule regarding supersession of a contract by a subsequent agreement is set out in
Willeke v. Bailey,
Affirmed.
Notes
. The parties stipulated as to damages.
