NOTE Nº 0597 · REV B

Construction Law for Homeowners: The Complete Guide

The complete UK guide to construction law for homeowners: Consumer Rights Act 2015, Defective Premises Act, Building Safety Act and limitation periods.

By The Renovation Notes Team · 7 min read · Published 20 August 2026 · updated within the last month · Sources checked 30 September 2026

Carpenter cutting wood with a circular saw at an outdoor construction site, showcasing craftsmanship.

In short

Homeowners have more legal protection on building work than most realise: the Consumer Rights Act 2015 implies quality terms into every job, the Defective Premises Act 1972 covers work that makes a dwelling unfit to live in, and since the Building Safety Act 2022 some claims reach back 30 years. This guide maps the statutes, the time limits, and which route fits which problem.

You don’t need a law degree to run a building project, but knowing which laws sit behind your contract changes how confidently you handle deposits, defects and disputes. This pillar maps the framework in plain English: what each statute does, when it applies, and how long you have. It covers England and Wales; Scotland and Northern Ireland differ in places.

The Consumer Rights Act 2015: your everyday protection

For any building work you commission as a consumer, the law writes terms into the contract whether or not anything is on paper:

the work must be done with reasonable care and skill;¹
if no price was fixed, you pay only a reasonable price;²
if no timescale was fixed, the work must be done in a reasonable time;³
things the trader said that you relied on, “that beam won’t need building control”, “we always include making good”, are treated as binding terms.⁴

The primary remedy for substandard work is repeat performance: the trader fixes it at their own cost, in reasonable time, without significant inconvenience.⁵ If they can’t or won’t, you’re entitled to a price reduction, which in practice is the legal basis for paying someone else to correct the work and claiming the cost.⁶ The Act also polices small print: under its unfair terms rules, one-sided clauses (unlimited cancellation fees, “no liability for anything” wording) simply don’t bind you.⁷

The Defective Premises Act 1972: the fitness backstop

Anyone who takes on work “for or in connection with the provision of a dwelling”, builders, developers, architects, engineers, owes a statutory duty that the work is done in a workmanlike or professional manner, with proper materials, so the dwelling is fit for habitation when complete.⁸ It bites on serious matters: structural failure, pervasive damp, dangerous services. Crucially, the duty is owed not just to the person who commissioned the work but to later owners, which is why it matters when you’ve bought a house with a botched conversion you never contracted for.⁸

The Building Safety Act 2022: longer memories

The BSA transformed time limits for Defective Premises Act claims: 15 years for work completed on or after 28 June 2022, and a retrospective 30 years for work completed before it.⁹ A defective 2005 loft conversion that would have been long out of time under the old six-year rule may now be actionable. The Act also toughened enforcement under the Building Act 1984, the regime behind building control: notices requiring non-compliant work to be altered or removed can now be served up to 10 years after completion, instead of 12 months.¹⁰

Contract, negligence, and which to use

Most claims against your own builder run in contract (six years from the breach, usually completion of the defective work; twelve if the contract was signed as a deed).¹¹¹² Negligence matters when contract is unavailable: claims against professionals, damage discovered late (the Latent Damage Act allows three years from when you could have known, capped by a 15-year longstop), or defects in work someone else commissioned.¹³¹⁴ The routes overlap; the dispute guides in this series cover picking between them.

Route	Typical time limit
Contract (simple)	6 years from breach
Contract (deed)	12 years from breach
Negligence	6 years from damage, or 3 from knowledge
Defective Premises Act	15 years (30 retrospective)

CDM 2015: the duties you didn’t know you had

The Construction (Design and Management) Regulations apply to all building work, including domestic jobs.¹⁵ The good news: as a domestic client your duties transfer automatically, to the contractor on a single-contractor job, or the principal contractor where there’s more than one.¹⁶ What remains worth knowing: a project is notifiable to HSE if it is scheduled to last more than 30 working days with more than 20 workers on site at the same time, or to exceed 500 person-days.¹⁷ If you engage several trades directly and appoint no one to lead, the regulations treat the contractor in control of the construction phase as the principal contractor, and the designer in control of the pre-construction phase as the principal designer, so agree in writing who is taking that role.¹⁶ Our project-management guides cover how to set that up.

Enforcement by the council

Building control failures have their own regime under the Building Act 1984, including notices requiring non-compliant work to be altered or removed, and prosecution of those who carried it out.¹⁸ If you’re on the receiving end (often after buying a house with unauthorised work), regularisation and indemnity insurance are usually the practical fixes; the enforcement guide in this series covers the formal process. Planning breaches run under a separate regime, see our planning permission guides.

Using this in real life

Statutes are leverage, not first resorts. The practical order remains: raise it, document it, escalate formally, and let the legal framework above decide how hard you can push and for how long.

In this series

The detailed law guides behind this page:

This guide is general information for homeowners in England and Wales, not legal advice on a specific dispute.

References (18)

Figures in this note were checked against the sources below on 30 September 2026. Superscript numbers in the text point to them. Every source the site cites, by topic.

1technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-F06Z1FSection 49(1), in Part 1 Chapter 4 of the Consumer Rights Act 2015, states that every contract to supply a service is to be treated as including a term that the trader must perform the service with reasonable care and skill. Section 49(2) directs the reader to section 54 for the consumer's rights when that implied term is breached. This is the single provision that makes poor workmanship by a builder a breach of contract without the homeowner having to prove anything was written down, and it cannot be excluded to the extent it would stop the section 54 to 56 remedies applying.
2technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-BXZ3F2Section 51 of the Consumer Rights Act 2015 governs the case where no price was ever fixed. It applies where (a) the consumer has not paid a price or other consideration, (b) the contract does not expressly fix a price or say how it is to be fixed, and (c) nothing treated as included under section 50 fixes one either. Where all three apply, subsection (2) treats the contract as including a term that the consumer must pay a reasonable price and no more, and subsection (3) makes what is reasonable a question of fact. This is the provision a homeowner relies on when a trade started work on a handshake and later issued an inflated invoice: the invoice is not automatically the price.
3technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-WUJM74Section 52(1) applies where the contract does not expressly fix the time for the service to be performed or say how it is to be fixed, and where no information treated as included under section 50 fixes the time either. In that case section 52(2) treats the contract as including a term that the trader must perform the service within a reasonable time, and section 52(3) makes what is reasonable a question of fact. Section 52(4) points to section 54; the remedy for breach of the reasonable time term is a price reduction under section 56, not repeat performance. This is the provision to cite when a builder has no contractual completion date and has overrun.
4technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-EQVKC0Section 50(1) treats anything said or written to the consumer by or on behalf of the trader about the trader or the service as a term of the contract, if the consumer took it into account when deciding to enter into the contract or when making any later decision about the service. Section 50(2) subjects that to anything said on the same occasion that qualified it, and to any change expressly agreed. Section 50(3) treats information provided under regulations 9, 10 or 13 of the Consumer Contracts (Information, Cancellation and Additional Charges) Regulations 2013 (SI 2013/3134) as contract terms, and section 50(4) makes any change to that information ineffective unless expressly agreed. This is the basis for holding a builder to a verbal promise, a written quotation figure or a stated completion date.
5technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-H89TBVSection 55(1) defines repeat performance as requiring the trader to perform the service again to the extent necessary to complete it in conformity with the contract. Section 55(2) requires the trader to provide it within a reasonable time and without significant inconvenience to the consumer, and to bear any necessary costs incurred in doing so, expressly including the cost of any labour or materials. Section 55(3) removes the right where completing performance in conformity with the contract is impossible. Section 55(4) says what counts as a reasonable time or significant inconvenience is judged by the nature of the service and the purpose for which it was to be performed. This is the legal answer to a builder who offers to come back but wants paying again for the return visit.
6technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-CPGOMASection 56(1) gives the consumer the right to require the trader to reduce the price by an appropriate amount, including a refund of anything already paid above the reduced amount, and section 56(2) allows the reduction to be the full price where appropriate. Section 56(3) restricts the choice: a consumer who also has the right to repeat performance may only take a price reduction where repeat performance is impossible under section 55(3), or where the consumer required repeat performance and the trader failed to do it within a reasonable time and without significant inconvenience. Section 56(4) requires any refund without undue delay and in any event within 14 days beginning with the day the trader agrees the consumer is entitled to it, section 56(5) requires the same means of payment unless the consumer expressly agrees otherwise, and section 56(6) forbids any fee for making the refund.
7technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-8QHXF5Section 62(1) and 62(2) make an unfair term of a consumer contract and an unfair consumer notice not binding on the consumer, while 62(3) still lets the consumer rely on the term if they choose. Section 62(4) sets the test: a term is unfair if, contrary to the requirement of good faith, it causes a significant imbalance in the parties' rights and obligations under the contract to the detriment of the consumer. Section 62(5) requires fairness to be judged by the nature of the subject matter and by all the circumstances existing when the term was agreed, together with all the other terms of that contract or any contract it depends on; 62(6) and 62(7) apply the same test to notices. Section 62(8) preserves the separate exclusion-of-liability rules in sections 31, 47, 57 and 65. This is the provision for challenging a non-refundable deposit clause or a one-sided variation clause in a builder's terms.
8technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-TD41J9Section 1(1) imposes a duty on anyone taking on work for or in connection with the provision of a dwelling, whether by erection, conversion or enlargement, owed both to the person to whose order the dwelling is provided and to every person who later acquires a legal or equitable interest in it, to see that the work is done in a workmanlike or professional manner, with proper materials, and so that the dwelling will be fit for habitation when completed. Section 1(2) treats a person working to another's instructions as discharging the duty to the extent the work follows them properly, except where they owed and failed in a duty to warn of defects in the instructions; section 1(3) says merely agreeing to a specified manner, materials or design is not giving instructions. Section 1(4) brings a business that arranges for another to do the work within the duty. Section 1(5) fixes the accrual of the cause of action at the date the dwelling was completed for Limitation Act 1980 purposes, with a fresh accrual for any later rectification work when that further work is finished. The duty runs to subsequent owners, which contract claims do not.
9technicalvery strongThe National Archives, guidance.RN-2HF4ITThe limitation section inserted by the Building Safety Act 2022 on 28 June 2022. It sets a 15-year limit for Defective Premises Act s.1 and s.2A claims, and 30 years for s.1 claims that accrued before that date.
10technicalvery strongThe National Archives, guidance.RN-E88EH4The section that replaced the penalty in s.35 of the Building Act 1984, making contravention of building regulations triable on indictment, and extended the s.36 notice period from 12 months to 10 years.
11technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-AUJII4Section 8 of the Limitation Act 1980 explains why a building contract executed as a deed is worth insisting on. Subsection (1): an action upon a specialty shall not be brought after the expiration of twelve years from the date on which the cause of action accrued. Subsection (2) confirms this does not override any shorter period prescribed elsewhere in the Act. A specialty is a contract executed as a deed, so where a homeowner and contractor sign the building contract as a deed the claim window for breach is twelve years from breach rather than the six years that section 5 gives for a simple contract. That difference matters for defects that take years to surface, such as inadequate foundations, failed damp proofing or a roof that only leaks under sustained driving rain. Read alongside section 14B, which imposes a fifteen year longstop on negligence claims, and the Defective Premises Act 1972 periods extended by the Building Safety Act 2022.
12technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-L5C0B9Section 5 of the Limitation Act 1980: an action founded on simple contract cannot be brought more than six years after the cause of action accrued. This is the six-year limit on suing a builder over a contract that was not executed as a deed, and it runs from the breach, not from when the defect was discovered. The single most important date in a dispute about defective work.
13technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-NT0BCVSection 14B of the Limitation Act 1980 is the absolute cut-off for negligence claims against a builder, designer or engineer where no personal injury is involved. Subsection (1): an action for damages for negligence, other than one to which section 11 or 11ZA applies, shall not be brought after the expiration of fifteen years from the date, or if more than one from the last of the dates, on which there occurred any act or omission alleged to constitute negligence and to which the damage is alleged to be attributable. The fifteen years runs from the negligent act itself, not from the date the homeowner discovered the problem, and it overrides the more generous three-year date-of-knowledge extension in section 14A. In practice a latent defect discovered sixteen years after the work was done is out of time in negligence however reasonable the delay in noticing it.
14technicalvery strongThe National Archives, guidance.RN-MHLPHLThe latent damage rule inserted by the Latent Damage Act 1986: a negligence claim for damage other than personal injury may be brought within six years of accrual or three years from the date of knowledge, whichever is later.
15technicalvery strongHealth and Safety Executive, guidance.RN-D7GLU7HSE page (updated 7 October 2025) defining a domestic client under CDM 2015 as any individual having construction work done on their own home or a family member's home that is not part of a business. On a single-contractor project the contractor automatically takes on the client's legal duties; where there is more than one contractor the principal contractor takes them on, unless the client makes a written agreement for the designer to act as principal designer.
16technicalvery strongThe National Archives, legislation.RN-MEXGZNRegulation 7 of CDM 2015, application to domestic clients. A homeowner's client duties pass automatically to the contractor where there is one contractor, to the principal contractor where there is more than one, or to the principal designer under a written agreement. This is the provision that means a householder does not personally carry CDM duties, and it is also why appointing several trades directly quietly makes somebody the principal contractor.
17technicalvery strongThe National Archives, legislation.RN-3XA3FCRegulation 6 of CDM 2015, notification. A project is notifiable to HSE if the construction work is scheduled to last more than 30 working days with more than 20 workers at any one time, or to exceed 500 person days. Below those thresholds no F10 notification is needed, which is why almost no domestic job is notifiable and why a contractor asking for one on a house extension is usually mistaken.
18technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-NKK4KZSection 36(1) lets the building control authority, without prejudice to prosecuting for a fine, serve notice on the owner requiring work that contravenes building regulations to be pulled down or removed, or at the owner's election altered so as to comply. Section 36(2) applies the same power where work was executed without an application for building control approval, despite refusal of one, or otherwise than in accordance with the requirements of a granted application. Section 36(3) gives the owner 28 days, or longer if the appropriate court or tribunal allows, before the authority may carry out the work itself and recover the reasonable expenses. Section 36(4) is the key protection: a section 36 notice may not be given after 10 years from the date the work was completed. Sections 36(5) and 36(5A) bar a section 36 notice where a building control approval application for work that is not higher-risk building work was granted and the work was executed in accordance with the approved plans and any requirement imposed.