By complaint filed August 7,1979, Mark Solomon and Pauline Solomon (the “buyers”) alleged that on December 9, 1968, i.e., eleven years previously, Marvin Birger and Eleanor Birger (the “sellers”) had induced them through misrepresentation to buy a defective house. A Superior Court judge entered summary judgment in favor of the defendant sellers.3 This appeal followed. The basis urged by the defendants in favor of summary judgment was that the plaintiffs’ action was long time-barred.
We summarize certain undisputed facts which we are able to deduce from a mass of affidavits, answers to interrogatories, responses to notices to admit facts, and depositions. The house in question is located at 104 Oldham Road, Newton, and was built in 1954, i.e., twenty-five years before this action was brought, by a home builder, Dorchester House Remodeling, Inc. Marvin Birger, one of the defendants, was the first buyer and resident owner. In 1959 Marvin Birger conveyed the property to himself and his wife as tenants-by-the-entirety. They continued to occupy the premises as their home until 1968, the year they sold the house to the plaintiffs.
On June 3, 1968, the Birgers, who were building a new home in Weston, placed their property for sale with a real estate brokerage firm. A broker from that firm took the Solomons through the house on June 22, 1968. There was no conversation of consequence between the prospective buyers and Mrs. Birger, who was at home during the tour. The Solomons were free to inspect the premises. About a month later, on July 5, 1968, the Solomons made a written offer to buy the Birger house for $36,000, an offer which the Birgers accepted. The offer form contemplated execution of a purchase and sale agreement and the parties, under date of July, 1968,4 executed an agreement on the Greater Boston Real Estate Board *636form (1962 rev.). Once again, the record discloses no conversation of consequence between the buyers and the sellers, and, indeed, neither of the sellers was present when the Solomons signed the agreement.
Delivery of the deed occurred on December 9, 1968. During the interim, the Solomons made a number of visits to the house. On one such visit Mrs. Birger took a painter through the house to estimate painting work to be done. Above an archway leading to the bedrooms, the painter noticed a crack five feet long and about an eighth of an inch wide. “What is this crack?” he inquired. Mrs. Birger replied, “Oh, it is probably from sonic boom.” Mrs. Solomon construed that remark as “kind of’ facetious. That statement is the one upon which the plaintiffs have fixed as the Birgers’ oral misrepresentation of the condition of the house.5 There is no record of any other statement by the Birgers regarding the structural integrity of the house. So far as appears, neither the Solomons nor anyone on their behalf made a physical inspection, other than the walk through with the painter.
Within a few months after they moved in, Mr. Solomon discovered a large crack in the basement slab when he pulled back a rug. In 1970, the Solomons replaced a lower retaining wall, and, in 1973, they added a buttress wall at the rear of the house in an attempt to arrest movement of the back wall. In 1974, the Solomons noticed cracks in their front and rear foundation walls. There followed a series of consultations with engineers, contractors, and building consultants. One of the first of these, Tsiang Engineering, Inc., in 1975 reported that the house was settling because of, among other reasons, poor soil condition, horizontal soil pressure, poor fill material, and insufficient compaction of fill.
*637During the discovery phase of the case, the battle was fought over the buyers’ charge that the sellers had misrepresented and concealed the condition of the premises. The plaintiffs have conceded that a tort claim based on misrepresentation is time-barred, even giving effect to the extension provision which G. L. c. 260, § 12, makes available in case of fraudulent concealment.6 Rather, the plaintiffs urge two theories of recovery linked to the purchase and sale agreement, an instrument expressed by its terms as under seal, and upon which the plaintiffs argue they can, therefore, maintain an action within twenty years of the date the cause of action accrued. G. L. c. 260, § 1. The first of those theories is that the Birgers committed fraud in the inducement of the contract when Mrs. Birger made the “sonic boom” response to the painter’s inquiry about the crack in the arch. A second theory relies on a clause in the contract which required delivery of possession of the premises “not in violation of . . . building laws.”
1. Fraud. Actions for damages based on deceit sound in tort, a fact reflected in reported cases where the gravamen was that the plaintiff had been induced into a real estate transaction through the misrepresentation of a material fact by the defendant. See, e.g., Sheffer v. Rudnick, 291 Mass. 205, 205 (1935); Forman v. Hamilburg, 300 Mass. 138, 139 (1938) (wherein it is noted, however, at 142, that upon discovery of the fraud the plaintiff could have elected to rescind the contract); Swinton v. Whitinsville Sav. Bank, 311 Mass. 677, 677-678 (1942); Kabatchnick v. Hanover-Elm Bldg. Corp., 328 Mass. 341, 342 (1952); Fogarty v. Van Loan, 344 Mass. 530 (1962) (whether action for breach of warranty will lie for oral representation of quality of real estate not decided); Friedman v. Jablonski, 371 Mass. 482, 483-484 (1976); Nei v. Burley, 388 *638Mass. 307, 310 (1983); Henshaw v. Cabeceiras, 14 Mass. App. Ct. 225, 225-226 (1982).7
If we were to apply to the normal statute of limitations of three years8 the extension which G. L. c. 260, § 12, affords, the latest the plaintiffs could have brought a tort action was within three years after they received the Tsiang report dated August 12, 1975. From that report the plaintiffs learned that their house suffered from a serious foundation defect, even if they may have been uncertain of its precise extent and nature. See Mansfield v. GAF Corp., 5 Mass. App. Ct. 551, 555 (1977). It will be recalled that the plaintiffs did not file their action until August 7, 1979. Conscious of that hurdle, the plaintiffs, after substantial discovery, filed with the court an election to abandon all actions other than those “based upon contract under seal.” They did not, however, opt for rescission, a contract remedy that is available as an alternative to a tort action for deceit, although generally in circumstances where there has been only partial or relatively recent performance of the contract. See Forman v. Hamilburg, 300 Mass. at 142; Geoffrion v. Lucier, 336 Mass. 532, 537 (1957); McMahon v. M & D Builders, Inc., 360 Mass. 54 (1971); 12 Williston, Contracts § 1523 (3d ed. 1970). Cf. National Academy of Sciences v. Cambridge Trust Co., 370 Mass. 303, 309 (1976). Actions for rescission must be brought with reasonable promptness. 12 Williston, supra, § 1526, at 622. Cf. Restatement *639(Second) of Contracts §§ 164 and 380 (2) (1979). Rather, the plaintiffs argue that since the defendants’ alleged misrepresentation served to induce the plaintiffs to sign the purchase and sale agreement as an instrument under seal, they may sue for damages on the basis of the misrepresentation at any time within twenty years of the performance of that contract.
An action on a written contract under seal enjoys a long statute of limitations because “the writing is clear evidence in permanent form of the terms of the agreement. . . .”18 Willis-ton, Contracts § 2020, at 678 (3d ed. 1978). A misrepresentation of the sort here alleged is not written into the agreement and such evidence as the plaintiffs proffer is entirely oral.
The ephemeral nature of unwritten representations and the natural tendency of persons to reconstruct history in a self-justifying manner are considerations which militate in favor of restricting the time in which an action may be founded on them. In choosing the correct limitations period we look to the essential nature of the action, not its form. Hendrickson v. Sears, 365 Mass. 83, 85 (1974). Here the essential nature is deceit. The plaintiffs’ theory would stretch the limitations period far beyond the extension already worked in cases of fraudulent concealment by the remedial provisions of G. L. c. 260, § 12. It is a theory we do not endorse. Even were we to adopt the plaintiffs’ reasoning, it would not help them. The asserted misleading statement was made several months after the parties signed the purchase and sale agreement and, therefore, could not have induced the plaintiffs to enter into the contract.
That the defendants failed to mention the house had developed cracks, including one in the basement obscured by floor covering, does not constitute fraudulent concealment. Homeowners who sell their houses are not liable for bare nondisclosure in circumstances where no inquiry by a prospective buyer imposes a duty to speak. Swinton v. Whitinsville Sav. Bank, 311 Mass. at 678-679. Nei v. Burley, 388 Mass. at 310-311. Henshaw v. Cabeceiras, 14 Mass. App. Ct. at 227. There must be some affirmative act of concealment of the cause of action. Salinsky v. Perma-Home Corp., 15 Mass. *640App. Ct. 193, 197 (1983). Compare Kannavos v. Annino, 356 Mass. 42, 50 (1969).
2. The building law clause. It requires a very expansive, indeed, imaginative, reading of the complaint to find a statement of the claim based on the building law clause in the purchase and sale agreement. The complaint never mentions any clause of the purchase and sale agreement which purports to make a representation. Rather, paragraphs 11 and 12 of the complaint make only general allegations of warranty by the sellers, without reference to any writing. As the defendants have elected to meet the plaintiffs on substantive rather than pleading grounds, and in view of the liberal amendment provisions of Mass.R.Civ.P. 15, 365 Mass. 761 (1974), we consider the issue which the plaintiffs press. It is based on sections 4 and 9 of the purchase and sale agreement, which was, as we have said, prepared on the January 1, 1962, revision of the form published by the Greater Boston Real Estate Board.
Section 4 of that agreement calls upon the seller to convey a good and clear record and marketable title, free from encumbrances, except, among other things, provisions of existing building and zoning laws. Section 9, upon which the plaintiffs heavily rely, provides: “Full possession of said premises free of all tenants and occupants . . . is to be delivered at the time of the delivery of the deed, said premises to be then (a) in the same condition as they now are, reasonable use and wear thereof excepted, and (b) not in violation of said building and zoning laws. . . .” Into this latter section, i.e., § 9, the plaintiffs read a warranty by the sellers that the premises at the time of delivery of the deed will conform to the building code of the city of Newton. If the agreement so warrants, the materials submitted by the plaintiffs in opposition to the defendants’ motion for summary judgment are sufficient to raise a question of fact whether at the closing between the parties a building code violation existed.9
*641We do not think that the purchase and sale agreement so warrants. Sections 4 and 9 of the agreement are interdependent. Section 4 deals fundamentally with the state of the title. It does so expressly and mentions building and zoning laws, party wall agreements, taxes, and betterments as aspects of title considerations. There is a blank subparagraph in which counsel tailoring the agreement may insert references to such things as easements. Under § 4, certain fundamental criteria for conveyance of title are established so that the buyer, between the time of execution of the purchase and sale agreement and delivery of the deed, can investigate what kind of pig is in the poke. If the buyer discovers a building or zoning law violation, the buyer may, under § 9, opt out of the agreement, unless the defect is cured in accordance with the provisions of § 10. Section 9 is not expressed in terms of warranty, but rather in terms of the conditions upon which the buyer may accept or refuse conveyance.
It is difficult to imagine that an agreement designed by a real estate association would contain a twenty-year warranty about a fact of which the seller is likely to have imperfect knowledge, i.e., whether his structure, at the time of sale, conforms in every respect with the building code. Whatever doubt might exist about the meaning of the agreement is, however, resolved by the merger provision which appears in § 13. That section is carefully drawn: “The acceptance of a deed by the Buyer or his nominee as the case may be, shall be deemed to be full performance and discharge of every agreement and obligation herein contained or expressed, except such as are, by the terms hereof, to be performed after the delivery of said deed.” This language embodies the doctrine that acceptance of a deed ordinarily merges all obligations in the purchase and sale agreement, except those specified in the deed itself. Pybus v. Grasso, 317 Mass. 716, 717 (1945). Snyder v. Sperry & Hutchinson Co., 368 Mass. 433, 441-442 (1975).
*642To this general rule, Massachusetts decisions have carved an exception given expression in Lipson v. Southgate Park Corp., 345 Mass. 621, 625-626 (1963), Holihan v. Rabenius Builders, Inc., 355 Mass. 639, 642 (1969), and McMahon v. M & D Builders, Inc., 360 Mass. at 59-60. All three cases involve house builders, i.e., there was a separate agreement to construct or repair a building upon the premises to be conveyed. In those circumstances it was plausible to reason that the obligation to build was collateral to the undertaking to convey. It was also reasonable to suppose that a purchaser from a builder-vendor would rely on the contractor’s possessing the skill to build a house which is habitable. For a discussion of illustrative cases, see 12 Williston, supra, § 1506A. In the case now before us there is no undertaking collateral to conveyance of the premises. The seller had no obligation to fix anything, to remove anything, or to add something. Nothing needed doing if the buyers decided, after investigation, that the conditions of conveyance had been met.
Moreover, the language of the merger clause in the agreement in this case is more carefully drawn than that considered in the Lipson, Holihan, and McMahon cases. The language in the instant case merges into the deed every agreement and obligation except “such as are, by the terms hereof, to be performed after the delivery of said deed.” No provision appears in the agreement which by its terms calls for performance of an obligation after delivery of the deed. It is also worth noting that the form of agreement which the parties used was, unlike the form construed in the Lipson, Holihan, and McMahon line of cases, designed to cover the case of land with buildings on it. The sellers, who must surely have been surprised to be on the business end of a law suit eleven years after they passed a deed to their house, are entitled to the benefit of the language of their agreement.
That language, of course, has a purpose. The real estate market is unorganized in the sense that it has a vast number of individual buyers and sellers, some of whom participate in the market once or twice in their lives and move elsewhere thereafter. It is a market in which amateurs are the preponderant *643players. See Capezzuto v. John Hancock Mut. Life Ins. Co., 394 Mass. 399, 404 (1985). Buyers can — and well advised ones do — arrange for title searches and home inspections. They may also ask specific questions about the condition of the property, which sellers are bound to answer honestly. Kannavos v. Annino, 356 Mass. at 48. Once the transaction is completed, the parties are well served by being allowed to go their separate ways. This does not mean that sellers have a license to lie and cheat. If there have been misrepresentations, there is an adequate remedy in tort, and to the extent that the misrepresentation has been fraudulently concealed, the time for action is extended by G. L. c. 260, § 12, as well as by those cases which deal with the inherently unknowable. See and" compare Graveline v. BayBank Valley Trust Co., ante 253 (1985). Beyond that remedy for misconduct, we do not think we should encourage persons to litigate about their leaking roofs, faltering furnaces, inadequate drainage, and cracking walls long after the fact.10
3. The deed. In a final effort to come within a twenty-year statute of limitations, the plaintiffs argue that they were induced by fraud to accept a deed, a sealed instrument. The deed delivered, however, was a short form quitclaim deed. See G. L. c. 183, §§ 8 & 11. Such a deed covenants no more than that the grantor conveys the premises free from encumbrances made by him. Silverblatt v. Livadas, 340 Mass. 474, 477-478 (1960). Mendler, Massachusetts Conveyancers’ Handbook § 18.1 (3d ed. 1984).
The motion judge rightly concluded that, on the facts as to which there was no material dispute, the plaintiffs’ action was time-barred. He correctly allowed the defendant’s motion for summary judgment.
Judgment affirmed.
The buyers had earlier filed a stipulation of dismissal of a claim against Abraham Zibit, the real estate broker in the transaction.
If the day in July was ever filled in on the agreement form, it is not possible to make it out on the copy of the agreement which appears in the record. It is of poor quality but apparently the best which the sellers could produce. The buyers had no copy of the agreement at all.
The painter was a graduate student in the department of geological sciences at Harvard University, in which Mrs. Solomon worked. In a response to a notice to admit facts put by the plaintiffs, the Birgers deny the painter’s question and the response attributed to Mrs. Birger. For purposes of considering the Birgers’ motion for summary judgment, however, the question and answer must be taken as uncontested by the Birgers.
General Laws c. 260, § 12, has the effect of tolling the limitations period in cases of fraudulent concealment until the cause of action is discovered. At the latest, the Solomons were aware of a serious defect in the foundation of their house in August, 1975, when they received the Tsiang report (the report is dated August 12, 1975).
To be distinguished are cases, such as those relied upon by the plaintiffs, which recognize a cause of action in contract by a buyer against a builder-seller based on an implied warranty of habitability or an analogous theory. See, e.g., Duncan v. Schuster-Graham Homes, Inc., 194 Colo. 441, 442-444 (1978); Crowder v. Vandendeale, 564 S.W. 2d 879 (Mo. 1978) (en banc). Warranties of habitability are not normally implied in the transfer of a home from one purchaser to a subsequent one. See Crowder v. Vandendeale, supra at 881-882; Casavant v. Campopiano, 114 R.I. 24, 26-27 (1974). Compare Roberts, The Case of the Unwary Home Buyer: The Housing Merchant Did It, 52 Cornell L.Q. 835, 841-843 (1967); 12 Williston, Contracts §§ 1506A, 1523 (3d ed. 1970). Others of the plaintiffs’ cases involve equitable relief, e.g., Wolford v. Freeman, 150 Neb. 537 (1948) (rescission), which if sought — as it was not here — would be subject to equitable time limitations. See 12 Williston, supra § 1526.
G. L. c. 260, § 2A, as amended by St. 1973, c. 777, § 1.
The applicable building code is not in the record. There is evidence in the record suggesting that when the house was erected in 1954, the building failed to comply with soil compaction standards prescribed by the code. At the time of the sale to the Solomons, the house was already fourteen years *641old. Lacking the code provisions, we do not know whether those provisions after a certain period of time bar the building commissioner of Newton from charging a code violation incident to the construction of a house that was built pursuant to a duly issued permit and duly inspected by the Newton building department during construction.
There is a suggestion of what the Legislature considers appropriate public policy in this area of activity in G. L. c. 260, § 2B, as amended by St. 1973, c. 777, § 2. That statute precludes actions of tort “arising out of any deficiency or neglect in the design, planning, construction or general administration of an improvement to real property” after six years following the completion of the work. See generally Klein v. Catalano, 386 Mass. 701 (1982).