Buy a house with a rotten conversion and you meet the cruel gap in ordinary law: the contract for that botched work was someone else’s, so contract claims aren’t yours to bring. A 1972 statute exists for exactly this gap, and a 2022 one quietly turned it into one of the most powerful tools in residential construction law.
The duty
Section 1 of the Defective Premises Act: anyone who takes on work “for or in connection with the provision of a dwelling” owes a duty to do the work in a workmanlike (or professional) manner, with proper materials, so that the dwelling is fit for habitation when completed. Three limbs, and claimants must ultimately land the third: the defect renders the home unfit to live in, structural inadequacy, serious damp and mould, dangerous services, failed waterproofing. Cosmetic and middling defects don’t reach the bar; this is the statute for the serious end.
“Provision of a dwelling” covers building new homes and works that create dwellings (conversions); substantial refurbishment sits in a greyer zone the courts assess on facts, but loft conversions and major remodels creating habitable space have the right shape.
Who owes it: and to whom
The duty catches the whole delivery chain: the builder, the developer who commissioned, the architect and engineer who designed, specialist subcontractors for their piece. And it is owed “to every person who acquires an interest in the dwelling”, the original client and every later buyer. That second half is the Act’s superpower: it hands a claim to the person who never had a contract with anyone involved. It cannot be excluded by contract terms, either, s.6 voids attempts to contract out.
The time limits that changed everything
Historically claims ran six years from completion, expiring before many serious defects surfaced. The Building Safety Act 2022 rewrote this for s.1 claims:
- work completed after 28 June 2022: 15 years;
- work completed before 28 June 2022: 30 years, retrospectively revived, meaning defective work from the 1990s onwards became actionable again in 2022.
A structurally inadequate 2005 conversion, long out of time under every other route, may today be a live DPA claim against the firm that built it (existence and solvency permitting, the practical catch with any claim against a long-ago builder). The full limitation landscape sits in our limitation periods guide.
Running a DPA claim in practice
The shape mirrors any serious defects claim: an expert report establishing the defect, its cause in the original work, and unfitness for habitation; identification of who took on the work (building control records, planning files, warranty documents and Land Registry all help reconstruct old projects); then the standard escalation, though claims of this seriousness usually justify a construction solicitor early. Damages cover putting the dwelling right and consequential losses.
Where it sits in your toolkit
Against your own recent builder, the Consumer Rights Act and contract are simpler routes. The DPA matters when you bought the problem (no contract of your own), when time has beaten contract claims, or when the target worth suing is the developer or designer rather than an evaporated building company. For dwellings with serious defects and a solvent defendant somewhere in the chain, the 1972 Act, with its 2022 time machine, is often the last door still open, which is exactly why it belongs in the construction law pillar’s map.
This guide is general information for homeowners in England and Wales, not legal advice.
