Building Regulations UK: Approval, Completion Certificates and Enforcement by Nation

Building regulations approval is a separate requirement from planning permission, and each UK nation runs its own regime: England and Wales share the Building Act 1984 mechanism, Scotland uses a building warrant and completion certificate system under its own 2003 Act, and Northern Ireland runs its own 1979 Order with a shorter enforcement time limit than England or Wales.

Building regulations and planning permission are different approvals

Planning permission controls whether a development is allowed at all: its use, scale, appearance and impact on neighbours. Building regulations approval is a separate, technical check on how the work is actually built, covering matters such as structural safety, fire safety, damp proofing, ventilation, drainage, electrical safety and energy efficiency. A single project, such as a home extension, can need both approvals at once, one without the other, or neither. See planning permission for the separate consent controlling whether the development itself is allowed.

What typically needs building regulations approval

Common homeowner projects that generally need approval include replacing a fuse box and its connected electrics, installing a bathroom that involves new plumbing, changing electrics near a bath or shower, fitting a fixed air conditioning system, replacing windows and doors, replacing roof coverings on a pitched or flat roof, installing or replacing a heating system, and adding extra radiators to an existing heating system. Without approval, a homeowner will not have the compliance certificate that can matter when selling the property later (gov.uk: building regulations approval). You can arrange approval through either your local authority's building control department, or a private registered building control approver, same source. You do not need to get approval yourself if you use someone registered with a competent person scheme (same source).

England and Wales: the Building Act 1984 regime

England and Wales share the Building Act 1984 and the Building Regulations 2010 made under it. The enforcement mechanism is a section 36 notice: the building control authority (the local authority, or the Building Safety Regulator for higher-risk buildings in England), not a private approver, can require the removal or alteration of work that contravenes the regulations. The original 1984 Act gave a 12 month time limit from completion of the work for issuing that notice (legislation.gov.uk: Building Act 1984, section 36).

The Building Safety Act 2022 substituted a 10 year limit for that 12 month figure. Commencement did not happen at the same time in both nations: the change took full effect in England from 1 October 2023, but in Wales the 10 year limit did not fully commence until 1 July 2026, after an earlier partial commencement in September 2023 covered only specified purposes (same source). As of 28 September 2026, both nations are now on the 10 year limit, but they reached it roughly 33 months apart under the same Act.

Scotland: building warrant and completion certificate

Scotland runs an entirely different Act: the Building (Scotland) Act 2003 (legislation.gov.uk: Building (Scotland) Act 2003). Instead of building control approving work after the fact, Scotland requires a building warrant before work starts, and a completion certificate once it finishes, both checked by a verifier, which at present is always the local authority for the area; approved certifiers of design and of construction are a separate role under the Act and are not verifiers (legislation.gov.uk: Building (Scotland) Act 2003, section 7; gov.scot: building standards procedural handbook, section 12).

Occupying or using a building constructed or converted under a warrant (or without one where a warrant was required), other than for construction or conversion purposes, knowing that no completion certificate has been accepted or without any regard for whether one has, and without a temporary permission from the verifier, is its own criminal offence under section 21 of the Act (construction here does not include alteration), carrying a fine up to the statutory maximum on summary conviction, or an unlimited fine on indictment (legislation.gov.uk: Building (Scotland) Act 2003, section 21). There is no equivalent standalone "moving in early is a crime" offence for ordinary homes and extensions in England, Wales or Northern Ireland: their offence is contravening the building regulations themselves, not occupying the building before sign off. The exception is England's higher-risk building regime: the accountable person commits an offence if homes in a newly built or newly created higher-risk building (at least 18 metres or 7 storeys, with at least 2 homes) are occupied before a completion certificate is issued (legislation.gov.uk: Building Safety Act 2022, section 76; section 65).

Northern Ireland: its own regime, and no 10 year extension

Northern Ireland runs the Building Regulations (Northern Ireland) Order 1979, administered by district councils. A contravention notice cannot be served after a prescribed period that is not more than 12 months from the date of completion of the work in question (legislation.gov.uk: Building Regulations (Northern Ireland) Order 1979, Article 18). Unlike England and Wales, this limit was not extended to 10 years by the Building Safety Act 2022, which does not apply to Northern Ireland's Order. Northern Ireland's offence, under Article 21, is also contravention based, breaching the regulations or a contravention notice, and has no standalone occupation offence matching Scotland's section 21 (legislation.gov.uk: Building Regulations (Northern Ireland) Order 1979, Article 21).

A separate civil claim: the Defective Premises Act 1972

The Building Safety Act 2022 also extended the limitation period for a civil claim over a badly built or converted dwelling under the Defective Premises Act 1972. This is a different mechanism from the regulatory enforcement notices above: it is a claim a homeowner can bring in the civil courts, not a council's own enforcement power. The new limitation period is 15 years for a claim accruing on or after 28 June 2022, and 30 years for a claim that had already accrued before that date (legislation.gov.uk: Limitation Act 1980, section 4B). This extension applies in England and Wales only. The longer retrospective period does not reopen a claim that was settled by agreement, or finally decided by a court or arbitration, before 28 June 2022 (legislation.gov.uk: Building Safety Act 2022, section 135).

Related reading

For whether your project needs a separate planning consent as well, see planning permission. For the wider set of property topics, see the UK property law hub.

Frequently Asked Questions

Is building regulations approval the same as planning permission?

No. Planning permission controls whether a development is allowed at all. Building regulations approval is a separate, technical check on how the work is actually built, covering matters such as structure, fire safety and electrics. A project can need one, the other, or both.

How long does a council have to take enforcement action over a building regulations breach in England?

10 years from completion of the work, since 1 October 2023, up from the original 12 month limit. Wales reached the same 10 year limit later, from 1 July 2026.

Is it illegal to move into a property before building control signs it off?

In Scotland, it can be: occupying or using a building constructed or converted under a warrant before its completion certificate is accepted, knowing that none has been accepted or without any regard for whether it has, and without temporary permission from the verifier, is a criminal offence under section 21 of the Building (Scotland) Act 2003. In England, Wales and Northern Ireland there is no equivalent offence for ordinary homes and extensions; the offence there is contravening the regulations themselves. England does make it an offence for the accountable person to let homes in a new higher-risk building (at least 18 metres or 7 storeys, with at least 2 homes) be occupied before a completion certificate is issued.

Does Northern Ireland have a 10 year building regulations enforcement limit like England?

No. Northern Ireland's contravention notice time limit stays capped at not more than 12 months from completion of the work, under the Building Regulations (Northern Ireland) Order 1979. It was not extended by the Building Safety Act 2022, which does not apply to Northern Ireland's Order.

How long can I be sued over defective building work under the Defective Premises Act 1972?

15 years from when the right of action accrued, for a claim accruing on or after 28 June 2022. If the claim had already accrued before that date, the limitation period is 30 years instead. This applies in England and Wales only.

Who checks building work in Scotland instead of building control?

A verifier, which at present is always the local authority for the area, grants the building warrant before work starts and accepts the completion certificate once it finishes; approved certifiers can certify some design or construction work, but the council remains the verifier. This is a different structure from the local authority or registered building control approver model used in England and Wales.