On the ground that the plaintiffs’ claim was barred by the statute of limitations, a judge of the Superior Court allowed the defendants’ motion under Mass. R. Civ. P. 12 (b) (6),
*266
This action was commenced on July 1, 1983. The parties agree that actions for malpractice against the defendant attorneys are governed by the statute of limitations set forth in G. L. c. 260, § 4, as appearing in St. 1981, c. 765. See
Cioffi
v.
Guenther,
The factual baсkground begins in August, 1972, when one Clark, an employee of an independent contractor, was seriously injured while painting a transmission tower owned by one of the еlectric companies. In separate actions Clark and his wife sued two of the electric companies. Home Insurance Company (Home Insurance) was an excess insurer of the electric companies (above $100,000). The primary insurer selected the defendant law firm to defend the actions, and the individual defendant attorney became involved in the defense.
The Clarks’ tort actions involved claims that the electric companies fаiled to warn the painting contractor and its employees of the risk and failed to provide proper supervision of the work. The electric companies relied on the defense that they provided proper supervision. In the course of preparation for last minute depositions, an employee of one of the companies and the individual defendant attorney found field notes of an internal investigation conducted by a cоmpany employee which contained a notation indicating that there had been no supervision of the painting operation. The attorney tоld the company employee, “That hurts.” The employee tore up the notes and threw them into a waste basket. The attorney did not retrieve the nоtes. About one week later, the defendant attorney and the law firm concluded that the Canons of Ethics required disclosure to the Clarks’ attorney of the information shown on the discarded field notes. That information was disclosed, as well as the fact of the destruction of the notes. Home Insurance, the excess insurer, learned of what had happened and notified the electric companies that it would reserve its rights as a result of the allegations of dеstruction of the field notes (and as the *267 result of alleged alteration of certain relevant documents, a matter in which the defendant attorneys did not participate).
In early 1977, the Clarks moved unsuccessfully for a default judgment. The judge ruled, however, that the fact of document destruction (and of the allegеd tampering with evidence) would be admissible against the electric companies at the trial of the Clarks’ tort actions. On February 8, 1977, the Clark case was settled for $725,000, of which Home Insurance paid $625,000 under a purported reservation of rights. The complaint in this case alleges that, because of the imprоper destruction of documents (and the alleged alteration of evidence), the electric companies were obliged to make a lаrger settlement than they would have otherwise. In January, 1980, Home Insurance brought an action against two of the electric companies seeking reimbursement of the $625,000 it paid in settlement of the Clark actions, alleging a breach of the cooperation clause in its insurance policy by the destruction of the field notes and by the altering of documents. The electric companies settled the Home Insurance action against them in 1981 by payment of $250,000.
As wе have said, this action was commenced on July 1, 1983, well within three years of the settlement of the Home Insurance action but well after three years of its сommencement. The defendant attorneys argue that the electric companies’ cause of action against them accrued at least by the date Home Insurance commenced its action in January, 1980. Because the Legislature has not undertaken to provide an answer as to when а cause of action for legal malpractice accrues, it is a question for judicial determination.
Hendrickson
v.
Sears,
In some cases involving the issue of when a сause of action accrues, we have been concerned with the question whether a plaintiff knew or had reason to know of the existence of the cause of action. See
Olsen
v.
Bell Tel. Laboratories, Inc., supra
at 174-175;
White
v.
Peabody Constr. Co.,
We conclude that the electric companies sustained appreciable harm at least by the time the Home Insurance action was commenced. Whatever the ultimate result of that case would be, it was then clear that the electric companies would incur substantial legal expenses in the defense of a claim that was based in part on the alleged negligent conduct of their attorneys in the defense of the Clark actions.
Salin
v.
Shalgian,
We, of course, need not decide what the result would be if the Home Insurance action had been brought before the Clark litigation had been disposed of and while the defendant attorneys continued to represеnt the electric companies in the Clark actions. See
Levin
v.
Berley, supra
at 554;
Northwestern Nat’l Ins. Co.
v.
Osborne,
Judgment affirmed.
Notes
Although we do not rest our decision on the point, we note that the complaint alleges that the electric companies’ meritorious defenses in the Home Insurance action were chiefly with respect to asserted defects in Home Insurance’s purported reservation of rights. Thus, the fact of the defendant attorneys’ negligence appears not to have been an issue for the electric companies in their defense of the Home Insurance action.
