Building regulations have teeth, mostly polite ones, occasionally sharp, and the homeowners who meet them usually do so by inheritance: the survey that finds the undocumented loft conversion, the sale that stalls on a missing completion certificate. Understanding the actual enforcement machinery turns a frightening letter into a manageable process.
The two main levers
Prosecution. Carrying out building work in breach of the regulations is an offence, committed by the person who did the work (builder) and potentially those who commissioned it. Fines are unlimited, and the Building Safety Act stretched the window from two years to 10. Prosecution targets the doer; buying a house with dodgy work doesn’t make you prosecutable for it.
Section 36 notices. The property-facing power: the council requires the owner to alter or remove work that contravenes the regulations. This one does attach to you as current owner, whoever did the work. Non-compliance lets the council do the works and recover costs. The traditional 12-month service window from completion of the work also moved to 10 years for work under the post-2023 regime, the practical reason “it’s been a few years, they can’t touch it now” is a weaker comfort than it was.
Dangerous structures run on separate, faster powers: where a building is dangerous, councils can require immediate remedy or act themselves, the emergency lane, not the routine one.
The routine reality
Councils enforce with proportion: their goal is compliant buildings, not maximum prosecutions, and the overwhelming majority of cases resolve through the compliance routes below without a notice ever being served. The letter that opens “it has come to our attention…” is an invitation to engage, the expensive mistakes are ignoring it, or covering up work mid-project after a stop request. Engage early, and building control officers are generally constructive to deal with; our building regulations guide covers the approval process itself.
Inherited unauthorised work: your options
Found (or been found with) work that never went through building control?
- Regularisation, retrospective approval: the council inspects (some opening-up is normal), requires any upgrading needed, and issues a regularisation certificate. The clean fix, available for work done after 1985; costs the application fee plus whatever compliance work is found. Right answer when you plan to stay, remortgage or sell without a cloud.
- Indemnity insurance, the conveyancing patch: a one-off premium insuring against the financial consequences of enforcement, not against the wall actually falling down. Standard in sales; understand what it does and doesn’t do before relying on it.
- Remedy or remove, where the work is genuinely poor, fixing it properly (with building control involved) is both the safe answer and the one that restores full value; a surveyor’s assessment tells you which category you’re in.
Live notice on the table? Take it seriously and take advice: notices carry appeal routes (to the magistrates’ court, on grounds including that the work actually complies) with short deadlines, and negotiated compliance schedules are common.
If you’re the one who commissioned the work
The builder who assured you “we don’t need building control for this” on notifiable work has exposed you to exactly this machinery, and breached the competence and care you were owed. Enforcement costs, regularisation fees and remedial works are all claimable losses through the normal dispute routes; the red-flags guide exists so the assurance gets challenged before the plasterboard goes on, not after.
This guide is general information for homeowners in England and Wales, not legal advice.
