The hidden defects time limit in Dutch property law consists of two separate deadlines, and a buyer who misses either one loses the claim however serious the defect. Under Article 7:23(1) of the Dutch Civil Code (BW) the buyer must notify the seller within a reasonable time (bekwame tijd) after discovering that the property does not conform to the contract. Under Article 7:23(2) BW any claim based on that non-conformity then lapses two years after that notification, unless the limitation period is validly interrupted. Both clocks are triggered by discovery, not by the transfer of the property.

This guide explains what qualifies as a hidden defect (verborgen gebrek), how the two periods run, how the buyer’s duty to investigate interacts with the seller’s duty to disclose, and what has changed for new-build purchases since the Quality Assurance Act came into force. It is written for buyers and sellers of Dutch residential and commercial property, and for anyone advising them.

What counts as a hidden defect under Dutch law

Dutch real estate law does not use the term hidden defect as a statutory concept. The underlying rule is conformity: under Article 7:17 BW the property delivered must possess the characteristics the buyer was entitled to expect on the basis of the contract. In the model purchase deed used for most Dutch home sales the seller additionally warrants that the property has the characteristics needed for normal use as a dwelling, and it is that warranty of normal use around which almost all disputes turn.

A defect is hidden where it existed before transfer, was not visible on a reasonable inspection, and is serious enough to stand in the way of that normal use. Severe foundation subsidence concealed behind new plasterwork is the classic example. Structural rot, an unsafe electrical installation, serious soil contamination, an extension built without the required permit, or an infestation that makes part of the house unusable can all qualify. A squeaking floorboard, a dripping tap or dated decoration cannot, because none of them prevents the property from being lived in.

Four conditions have to be satisfied together before a claim succeeds. The defect must have been present at the time of transfer of title. It must not have been reasonably discoverable by the buyer in the course of a proper pre-purchase investigation. It must genuinely obstruct normal use, or otherwise depart from what the contract promised. And the buyer must not have accepted the risk of it, whether expressly through an as-is or age clause or implicitly by buying with knowledge of the problem.

The threshold of normal use is higher than buyers expect. A defect that is expensive to repair is not automatically a defect that prevents normal use, and Dutch courts regularly reject claims for substantial repair bills on that ground alone. The severity of the consequence, not the size of the invoice, is what the test measures.

The two deadlines that decide a hidden defects claim

The moment of discovery starts both clocks. Managing that sequence correctly is the single most common reason strong claims succeed or fail.

The duty to complain (klachtplicht)

Article 7:23(1) BW requires the buyer to notify the seller within a reasonable time after discovering the non-conformity, or after the moment the buyer ought reasonably to have discovered it. There is no fixed statutory period for the purchase of a house. The two-month safe harbour that also appears in Article 7:23(1) BW applies to a consumer purchase (consumentenkoop), and under Article 7:5(1) BW a consumer purchase concerns movable goods, so it does not apply directly to the sale of an existing property.

What a reasonable time amounts to therefore depends on the circumstances: the nature and seriousness of the defect, the investigation the buyer reasonably needed in order to establish what was wrong, the expertise of the parties, and above all whether the delay has prejudiced the seller, for example by making the cause of the damage harder to establish or by depriving the seller of the chance to limit it. In practice a buyer who notifies within roughly two months of a clear discovery is rarely criticised, a buyer who takes six months without explanation usually is, and a buyer who is waiting for an expert report should say so in writing at once rather than waiting for the report itself.

The notification must be in writing and must be specific. A message stating that the buyer is not satisfied is not enough: the letter should describe the defect, state when and how it was discovered, invoke the seller’s non-conformity and hold the seller liable. Send it by registered post or by another means that produces proof of receipt, because the burden of showing that the seller was notified in time falls on the buyer.

The limitation period (verjaringstermijn)

Article 7:23(2) BW provides that claims and defences based on non-conformity lapse two years after the notification given under the first paragraph. The period runs from the notification, not from discovery and not from transfer, which means that a prompt complaint also starts the countdown on the litigation.

Two years is short, and it expires while negotiations are still running more often than anything else. It does not, however, have to be spent in court. Under Article 3:317(1) BW the limitation period is interrupted by a written communication in which the buyer unambiguously reserves the right to performance, and a new two-year period begins the following day. A buyer who is negotiating with the seller or waiting for an insurer should therefore send a short interruption letter (stuitingsbrief) well before each expiry date and keep proof of it. Relying on the seller’s acknowledgement of the problem, or on the fact that talks are ongoing, is not enough.

The two periods at a glance

Our guide to the prescription of claims under Dutch law sets out how limitation and interruption work more generally.

The buyer’s duty to investigate and the seller’s duty to disclose

Liability for a defect discovered after transfer is decided by weighing two duties against each other: the buyer’s duty to investigate (onderzoeksplicht) and the seller’s duty to disclose (mededelingsplicht). Neither is absolute, and the outcome is a matter of degree rather than a rule that can be applied mechanically.

The buyer is expected to carry out the investigation a reasonable purchaser would carry out. For residential property that normally means commissioning a technical survey (bouwtechnische keuring) before the cooling-off period expires or before any resolutive condition lapses. A survey does two things. It identifies visible defects, which then cease to be hidden. And it flags indications of a deeper problem, which enlarge the duty to investigate that specific point: once a report recommends further investigation of the roof or the foundations, a buyer who does nothing will find it very hard to say afterwards that the resulting defect was undiscoverable.

Against that stands the seller’s duty to disclose what the seller actually knows. Where the two duties collide, the duty to disclose generally prevails: a seller who knows the cellar floods every winter cannot defend a claim by arguing that the buyer should have noticed the water marks. That priority exists to prevent a seller profiting from silence, and it applies with particular force where the seller has answered a question in the standard information list (vragenlijst) inaccurately.

The practical difficulty is proof. The buyer must show what the seller knew, and knowledge is rarely documented. Correspondence, earlier quotations for repairs, statements from neighbours or previous tenants, insurance claims and the seller’s own answers on the information list are the material that decides these cases. It is also why the independent expert report matters so much: an expert who can date the origin of the damage to a period well before the sale makes the inference about the seller’s knowledge far easier to draw.

How contract clauses shift the risk

The purchase agreement can move the balance considerably in either direction, and the clauses that do so are standard rather than exotic.

A specific guarantee works in the buyer’s favour. Where the seller warrants in writing that the roof was replaced in a given year and is free from leaks, the buyer’s duty to investigate that element falls away almost entirely, and a leak that appears afterwards is a straightforward breach of warranty rather than a contested question of normal use.

An age clause (ouderdomsclausule) works the other way. It is common in the sale of older properties and records that the buyer accepts that the building’s age means that construction quality, installations and materials may not meet current standards. It raises the buyer’s duty to investigate substantially and makes claims for age-related deterioration, such as outdated wiring or perished plumbing, very difficult. It does not, however, cover defects that go beyond ordinary ageing, and it never covers what the seller knew and concealed.

An as-is clause (verkocht in de staat waarin het zich bevindt) shifts risk in the same way but is not a shield against everything. It cannot be relied on by a seller who deliberately withheld a known and serious defect, because the duty to disclose overrides it, and a clause that purports to exclude liability for the seller’s own intentional concealment will not be upheld. Where the buyer is a consumer and the seller a professional party, such exclusions are also open to challenge as unreasonably onerous general terms.

The principle underlying all three is simple: what the seller has disclosed, the buyer need not investigate as thoroughly, and every clause that limits the seller’s liability increases what the buyer is expected to have checked. Where a defect turns out to relate to recent building work rather than to the sale, our article on liability for construction defects sets out who can be held accountable.

New-build property: the Quality Assurance Act and Article 7:758 BW

A buyer of a newly built home is not in the position described above, because the counterparty is a contractor rather than a private seller and the applicable rules are those on contracting for work. The Quality Assurance Act (Wet kwaliteitsborging voor het bouwen, Wkb) changed those rules with effect from 1 January 2024, and it did so in the buyer’s favour.

Before that date, a contractor was in principle discharged on delivery from liability for defects the client ought reasonably to have discovered at that moment, and the client carried the burden of showing that a defect discovered later was hidden and attributable to the contractor. The Wkb added a new paragraph to Article 7:758 BW under which the contractor remains liable for defects that were not discovered on delivery, unless those defects cannot be attributed to it. The burden of proof therefore lies with the contractor, which is a substantial reversal.

Two qualifications matter. The new rule applies to construction contracts entered into on or after 1 January 2024, so for older contracts the previous regime continues to govern. And the rule can be departed from by agreement between professional parties, but not to the detriment of a client who is a natural person not acting in the course of a business or profession. A consumer buying a new-build home cannot validly be asked to contract out of it.

The standard construction conditions have been brought into line. The Uniform Administrative Conditions for the Execution of Works (Uniforme Administratieve Voorwaarden, UAV 2012) were amended in the version published in the Staatscourant on 3 March 2025: the provisions in paragraph 12 that conflicted with the new statutory rule were deleted, so that Article 7:758 BW now applies by default unless the parties expressly agree otherwise within the limits described above. Contractors should read this as a documentation obligation: the only reliable defence to a post-delivery claim is a complete record of the design decisions, the materials used and the inspections carried out.

Expiry clauses in standard building terms: a contested question

Separate from the statutory limitation period, standard building conditions have long contained contractual expiry periods (vervaltermijnen) of, for example, five years from delivery, after which the client’s rights lapse regardless of when a defect appears. These clauses are contested rather than settled, and anyone advised that the point is now decided has been advised too confidently.

On 17 December 2024 the Amsterdam Court of Appeal (ECLI:NL:GHAMS:2024:3490) held that the expiry period in the AVA 2013 general conditions is unreasonably onerous towards a consumer client. The court’s reasoning was that the clause is shorter than the statutory limitation period, cannot be interrupted in the way a limitation period can, and begins to run before the defect has been discovered, while offering the consumer nothing in return. On that basis the clause could be annulled and set aside.

The Raad van Arbitrage in Bouwgeschillen, which decides the majority of Dutch construction disputes under arbitration clauses in those same conditions, has since taken the opposite view, holding that such expiry periods remain reasonably long and are not unfair. Cassation proceedings against the Court of Appeal judgment are pending before the Hoge Raad, and until that judgment is given the position depends in part on which forum a dispute ends up in.

The practical consequence for a consumer client is not to rely on the argument but to act as though the expiry period is valid: complain in writing as soon as a defect appears, and issue proceedings or interrupt the period in good time. The argument that the clause is unfair is a fallback, not a plan.

What to do when you discover a hidden defect

The order of the steps matters as much as the steps themselves, because the first two protect the evidence and the third protects the deadline.

Record the defect before anything else. Photograph and film it from several distances, note the exact date and time of discovery, and describe factually what can be seen, heard or smelled without speculating about the cause. Keep the survey report, the purchase deed, the information list completed by the seller and the estate agent’s particulars together, because all four will be read against each other later.

Do not start repairs. Repair destroys the evidence of what caused the damage and how long it had been developing, and a seller faced with a claim will say so. Where an emergency measure cannot be avoided, such as isolating a water supply or making a structure safe, take photographs first and record what was done and why. Keep any material that is removed.

Instruct an independent expert. A report that identifies the defect, establishes its likely cause and the period in which it arose, and quantifies the cost of repair turns a complaint into a claim. The dating of the defect is the crucial element, because it is what shows that the problem existed before transfer and supports the inference that the seller knew.

Notify the seller in writing without waiting for the report to be finished. This is where claims are lost. Send a letter, by registered post or another traceable method, that describes the defect, states when it was discovered, invokes the non-conformity, holds the seller liable and gives a reasonable period in which to respond. If the expert investigation is still running, say that in the letter and confirm that the notification is given now to preserve the position. Where the seller has to be given the opportunity to remedy the defect, a formal notice of default (ingebrekestelling) with a reasonable deadline is also needed before damages can be claimed.

Then take legal advice, and diarise the limitation date. A real estate lawyer can assess the strength of the claim against the contract, the survey report and the expert findings, advise whether the claim is for repair costs, price reduction, damages or rescission, and keep the two-year period alive while negotiations continue. If the defect relates to recent building work rather than to the sale itself, the position may be governed by the rules on contracting for work instead, and our article on your rights when a contractor delivers poor work explains what those rules require.

Frequently asked questions about hidden defects

What if the defect was mentioned in the survey report?

Then it is not hidden. A defect recorded in the bouwtechnische keuring is known information, and the law assumes the buyer took it into account in agreeing the price. The same applies to a report that identifies a risk or recommends further investigation: that recommendation transfers the duty to investigate to the buyer, and ignoring it will usually defeat the claim even if the eventual damage is far worse than the report suggested.

Does an as-is clause protect the seller from everything?

No. It moves risk to the buyer for defects neither party knew about, but it does not protect a seller who concealed a known and serious defect. The duty to disclose overrides the clause, and a court will not allow a standard exclusion to be used to shelter deliberate non-disclosure. Where the buyer is a consumer and the seller acts professionally, the clause may also be challenged as an unreasonably onerous general term.

What is the difference between a defect and non-conformity?

Non-conformity is the broader concept: the property does not have the characteristics the buyer was entitled to expect under Article 7:17 BW. That covers physical defects, but also matters such as a missing permit, an undisclosed encumbrance or a floor area materially smaller than represented. A hidden defect is one species of non-conformity, namely a physical flaw that was present at transfer and could not reasonably have been discovered. The deadlines in Article 7:23 BW apply to non-conformity as a whole, not only to physical defects.

Can I still claim if I discover the defect years after the purchase?

Possibly. The klachtplicht runs from discovery, not from transfer, so a defect that genuinely could not have been discovered earlier can still be raised years later. The practical obstacles grow with time: the buyer must show that the defect existed at transfer, that it could not reasonably have been found sooner, and that the seller was not prejudiced by the delay, and all three become harder to prove as the years pass.

What can I actually claim from the seller?

Where non-conformity is established, the usual remedy is damages equal to the cost of restoring the property to the condition it should have had, or a reduction of the purchase price. Rescission of the sale is possible in principle but is reserved for defects serious enough to justify unwinding the transaction, which is rare. The seller may also be entitled to be given the opportunity to carry out the repair, which is another reason to notify in writing before the work is commissioned.

Advice on hidden defects and the applicable time limits

Law & More advises buyers and sellers of Dutch property on hidden defects claims: assessing whether a defect meets the normal use threshold, drafting the notification and interruption letters that keep a claim alive, instructing and challenging expert reports, and conducting negotiations and proceedings against a seller, a contractor or an insurer. We also advise sellers who are faced with a claim and need to know whether the buyer complained in time.

Because both deadlines run from discovery, the value of advice falls quickly once a defect has come to light. If you have found a defect, or received a letter alleging one, you are welcome to contact us to discuss your position.