The Defective Premises Act: Why Work You Did Years Ago Could Come Back to Bite You

SiteKiln gives you plain-English information, not legal advice. If you're facing a DPA claim or want to understand your exposure, talk to a construction solicitor.

‍‌‌​‌​‌​​​‌‌‌​‌‌‌‌‌​​‌​​‌​‌‌‌​​‌‌‍# The Defective Premises Act, Why Work You Did Years Ago Could Come Back to Bite You

You can think of the Defective Premises Act as a long tail on your work. Jobs you did years ago -- even ones you barely remember -- can, in some cases, still come back at you.

1. What the Defective Premises Act actually says

The Defective Premises Act 1972 (DPA) puts a legal duty on anyone who takes on work "for or in connection with the provision of a dwelling".

In plain terms, if you're involved in building or altering somewhere people live, you must:

• Do the work in a workmanlike or professional way
• Use proper materials
• Make sure that as far as your work goes, the dwelling will be fit for habitation when completed

It applies to:

• Builders and main contractors
• Trades: bricklayers, roofers, plumbers, electricians, window fitters, dryliners, etc. -- if your work is part of providing a dwelling
• Designers: architects, engineers, consultants can also owe duties under the DPA for their design work
• Developers and landlords involved in the provision of dwellings

Originally, DPA was mainly about new dwellings and conversions (new houses, new flats).

The Building Safety Act 2022 (BSA) added section 2A, which extends the duty to work on existing dwellings -- extensions, loft conversions, refurbishments and structural alterations.

2. "Fit for habitation" -- what does that mean?

The Act itself doesn't define "fit for habitation", so the courts have had to spell it out.

Cases like Rendlesham and later guidance say a dwelling is fit for habitation if, on completion, it can be occupied for a reasonable time:

• Without risk to the health or safety of the occupants
• Without undue inconvenience or discomfort

Points to pull out:

• It's about the dwelling as a place to live, not just whether a detail is to a perfect standard
• Multiple smaller defects can add up to make somewhere unfit -- roof leaks, bad damp, dangerous electrics, missing fire protection, serious cold/condensation
• Purely cosmetic issues or minor inconvenience on their own will usually not make a dwelling unfit

So DPA is aimed at real habitability problems -- structural, water ingress, fire safety, serious services defects -- not just a bit of rough mastic.

3. New builds vs refurb -- what changed?

Before the Building Safety Act: DPA mainly covered construction of new dwellings, and certain conversions where a new dwelling was created.

After the Building Safety Act 2022: new Section 2A extends the duty to work to any part of a building that contains one or more dwellings -- including extensions, lofts, refurbishments and structural alterations to existing homes.

So your extension, loft conversion, flat refurb, fire upgrade work can now fall under the DPA duty, not just full new builds.

This extension applies in England and Wales to work completed after 28 June 2022 for the 15-year forward period.

4. Limitation periods -- the 6 / 15 / 30-year story

Originally, DPA claims had a 6-year limitation period, in line with normal contract claims.

The Building Safety Act 2022 changed that by inserting section 4B into the Limitation Act 1980:

For DPA claims where the right to sue arose before 28 June 2022 (old defects): limitation is extended retrospectively to 30 years.

For DPA claims where the right to sue arises on or after 28 June 2022 (newer work): limitation is 15 years from completion.

"Retrospective 30 years" means: if a cause of action under DPA existed at any time in the 30 years before 28 June 2022, a claim can now be brought, even if it would previously have been out of time. In practice, that reaches back to work completed from around June 1992 onwards.

So yes, work you did in, say, 1995 on a block of flats or housing development could in principle still be within scope.

That is the scary bit for long-trading builders and designers.

5. What types of defects are covered (and what aren't)?

Covered -- if they make the dwelling unfit:

• Structural issues -- subsidence from poor foundations, dangerous alterations, inadequate support to new openings
• Damp / water ingress -- failed tanking, roof detailing, balconies, badly detailed junctions leading to mould/rot
• Drainage -- defective foul/grey water drainage causing health/sanitation problems
• Electrical -- dangerous wiring, non-compliant installations risking fire or shock
• Fire safety -- missing cavity barriers, inadequate fire stopping, unsafe cladding or compartmentation -- a big focus post-Grenfell

Probably not covered on their own:

• Minor cosmetic defects -- hairline cracks, poor paint finish, a single wonky tile -- unless they tie into bigger underlying problems
• Inconvenience without health/safety impact

The courts look at the defects as a whole and ask whether they make the dwelling unsafe or unreasonably difficult to live in for normal occupants (including vulnerable people).

6. DPA vs negligence vs breach of contract

Think of three overlapping routes:

Breach of contract -- between you and your client. Time limit generally 6 years from breach (or 12 years under deed). They must show you didn't do what the contract said.

Negligence -- duty of care breached, causing reasonably foreseeable loss or damage. Often also 6-year limitation from when damage occurs, subject to latent damage rules. Needs proof of duty, breach, causation and loss.

Defective Premises Act -- statutory duty to make dwelling fit for habitation, potentially to people further down the line (later owners), not just your direct client. Now with longer limitation (15/30 years).

DPA is particularly important where:

• The direct contract is long gone or out of time
• Later leaseholders or buyers want to go up the chain to builders or designers directly
• The defect is serious enough to make the dwelling unfit

You can easily face all three in a bigger case (contract, negligence, DPA) pleaded alongside each other.

7. Defences and mitigating factors

DPA is strict in some ways -- you can't exclude it in your contract. But you're not defenceless.

Things that may help:

• Compliance with building regulations -- not a total defence, but helps show your work was to accepted standards
• Building control sign-off -- again, not bulletproof, but useful evidence that the work was inspected and passed at the time
• Following competent design -- if you built strictly to a design by an architect/engineer, there could be scope to redirect liability towards them (as in cases confirming designers owe DPA duties too)
• Client instructions -- if the client overrode your advice and insisted on a solution that later proves defective, that can be relevant, especially if you warned them in writing

But: the DPA duty is yours as a person "taking on work" -- you can't just say "the architect told me to" and wash your hands entirely. Courts will look at who did what, and often big claims spread liability across developer, main contractor, specialist subs and designers.

8. Insurance -- the uncomfortable bit

Most small firms assume "I've got insurance, I'm covered" -- but DPA + 30-year retrospective periods doesn't sit well with standard policies.

Professional indemnity (PI): PI is generally claims-made -- it responds to claims made during the policy period, regardless of when the work was done, but only back as far as the retroactive date on the policy. If you've only carried PI with a retroactive date of, say, 2015, it probably won't respond to a DPA claim about something you did in 2000. Some policies offer unlimited retroactive cover, but many don't, or they restrict historic cladding/fire claims.

Public liability (PL): PL typically responds to accidental injury or property damage occurring during the policy period, not to pure economic loss or historic defects post-completion. It's rarely designed to backstop DPA claims about historic design/construction.

So for lots of small builders: the new 30-year retrospective DPA exposure is largely uninsured, especially for work long before their PI retro date or where cover has lapsed.

That's the hard truth many insurers and trade bodies are flagging -- the law changed, but historic insurance doesn't automatically expand to cover it.

9. What you can do now to protect yourself (as far as possible)

You can't change the law or buy retrospective cover for the 1990s. What you can do is improve your position from today onwards.

Tight records: keep job files for longer -- not just 6 years. For significant residential projects, consider digital archiving for at least 15 years, maybe 30 where practical. Include contracts, drawings, specs, RFIs, building control correspondence, test certificates, photos.

Photographs and as-builts: systematically photograph work before it's covered up -- fire stopping, structure, drainage, waterproofing, insulation. Store photos in labelled folders by project and date.

Written specs and variations: avoid major work on just "builder's scope" and handshakes. Get key requirements and any client-driven changes in writing; keep your warnings if they reject best practice.

Regulatory sign-off: make sure building control, warranty providers (NHBC etc.) and inspectors formally sign off their stages. Keep copies of completion certificates and warranty docs.

Insurance housekeeping: talk to your broker about your PI retroactive date and whether extended or unlimited retro cover is realistic. Avoid gaps in cover if you're doing any design or spec work, however small.

Scope clarity: be explicit in contracts about what you are and are not responsible for. It might not stop a DPA claim, but it helps frame expectations and responsibility.

10. Wider Building Safety Act context

The DPA changes sit inside a bigger Building Safety Act picture, mainly aimed at higher-risk residential buildings:

• The Act creates a Building Safety Regulator and a regime for higher-risk buildings (HRBs) -- generally residential buildings at least 18m or 7+ storeys with 2+ residential units
• Dutyholders in HRBs must maintain a "golden thread" of safety-critical information -- a digital record that supports fire and structural safety management through the whole life of the building

For smaller builders on low-rise homes and extensions, that might feel distant, but the cultural shift is towards traceability, documented decisions, and accountability at every level of the supply chain. The DPA extension is a clear example -- making sure owners and leaseholders can go back to the people who built or altered their homes, not just the party at the top.

11. Scotland and Northern Ireland

Scotland: Scotland doesn't use the DPA in the same way -- it has its own system under the Prescription and Limitation (Scotland) Act 1973 and case law for construction defects. Generally, claims prescribe after 5 years from when loss is known about, but recent changes (including around building safety) have adjusted some long-stop rules. You still face long-running liabilities, but the detail is different to DPA in England and Wales.

Northern Ireland: NI doesn't directly follow the DPA either; liability is driven by contract, negligence and local limitation law. There are similar Building Safety Act-style reforms on cladding/product liability beginning to feed through.

If you work across borders, you need advice specific to Scotland/NI rather than assuming the English DPA rules just copy over.

12. Reality check for small builders

The unpleasant but honest summary:

• There is now up to 30 years' potential exposure under DPA for certain residential defects in England and Wales
• Many small firms never knew about DPA, and their insurance likely doesn't cover all historic work, especially pre-retroactive date
• You can't contract out of DPA, and there's no magic insurance bolt-on that fixes 30 years of history overnight

What's in your control:

• Build properly now -- compliant, documented, and with good records
• Understand where your biggest risk sits (e.g. multi-unit residential, structural work, fire safety)
• Stay in touch with trade body guidance (FMB, NFB etc.) as early DPA/BSA cases come through and give more clarity on how aggressively the 30-year window will be used

What to do next

• Check your insurance: talk to your broker specifically about your PI retroactive date and whether DPA claims are covered. Don't assume -- ask.
• Start archiving properly: for any residential project from now on, keep digital records (photos, specs, building control, contracts) for at least 15 years
• Read the Building Safety Act guide for the broader picture on the new regulator, golden thread and competence requirements
• Read the warranty and guarantee obligations guide -- DPA sits alongside your contractual warranty obligations
• If you've received a claim: don't respond in writing until you've spoken to your insurer and a construction solicitor. Anything you say can be used.

A construction solicitor would typically charge £300-500/hour for DPA liability advice. This guide is free. If SiteKiln helped, buy us a brew.

Sources

• Defective Premises Act 1972 -- legislation.gov.uk/ukpga/1972/35 -- statutory duty to build dwellings fit for habitation
• Building Safety Act 2022, Section 134 -- legislation.gov.uk/ukpga/2022/30 -- insertion of section 2A extending DPA to work on existing dwellings
• Limitation Act 1980, Section 4B -- legislation.gov.uk/ukpga/1980/58 -- as inserted by BSA 2022, extending limitation to 15/30 years for DPA claims
• Prescription and Limitation (Scotland) Act 1973 -- legislation.gov.uk/ukpga/1973/52 -- Scottish limitation regime for construction defects
• Rendlesham Estates plc v Barr Ltd [2014] EWHC 3968 (TCC) -- guidance on "fit for habitation" under DPA

How this site is funded →

Spotted something wrong or out of date? Email us at hello@kilnguides.co.uk.

In crisis? Samaritans 116 123 · Mental health support

How this site is funded →