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The paperwork your building work should have produced

Every notifiable home improvement in England ends with a certificate. Pick the job to see exactly which documents you should hold, who issues each one, how to reorder a lost copy, and the honest options when the paperwork never existed. Every fact cited to the official source, checked on 2026-07-17.

New windows or doorsReplacement windows and external doors have needed building regulations sign off since 1 April 2002. Done properly, the job produces one certificate that buyers' solicitors ask for by name.New boiler or gas applianceA gas boiler installation should leave you with two pieces of paper: the building regulations certificate that arrives by post, and the commissioning checklist that keeps the warranty alive.Electrical workNew circuits, a replacement consumer unit, and work in bathroom zones are notifiable in England. Done properly, the job produces an installation certificate from the electrician plus a building regulations certificate from their scheme.Loft conversion or extensionStructural projects cannot be self certified by any scheme: building control follows the build and issues the completion certificate that every buyer's solicitor asks for. An uncertified loft room cannot safely be sold as a bedroom.Solar panelsA proper solar installation produces three things: the MCS certificate that export payments depend on, the network operator's connection paperwork, and the electrical certificates.Heat pumpHeat pump paperwork mirrors solar: the MCS certificate carries the grant and the resale value, alongside commissioning records and building regulations sign off through the installer's scheme.

Worth knowing before anything else

  • An installer registered with a government authorised competent person scheme signs off their own work instead of a building control application. You should receive the compliance certificate within 8 weeks of the work finishing, and the notification is what shows up in searches when you sell. GOV.UK: use a competent person scheme (opens in new tab)
  • The rules on unauthorised building work changed in 2023 and many guides are still wrong about it. A council can now serve a section 36 notice requiring work to be pulled apart or fixed for 10 years after completion (it used to be 12 months), and prosecution for breaching building regulations carries an unlimited fine and up to 2 years with no time limit. Missing paperwork does not quietly expire. Building Act 1984, sections 35 and 36, as amended by the Building Safety Act 2022 (opens in new tab)
  • If notifiable work was done without building control or a scheme installer, you can apply to the council for regularisation: a retrospective check and certificate, available for work done after 11 November 1985. The council can require parts to be opened up, and the fee pays for the inspection whether or not it passes. Building Regulations 2010, regularisation procedure (council guidance) (opens in new tab)
  • Indemnity insurance is a product solicitors sometimes discuss for missing certificates (roughly £20 to £300). Whether it applies is a question for your solicitor: it does not make the work compliant or safe, and because contacting the council about the work can affect eligibility, talk to your solicitor before making any calls. HomeOwners Alliance: no building regulations approval (opens in new tab)
  • When you sell, the Law Society TA6 property information form asks you to disclose alterations and attach the paperwork: planning permissions, building regulations approvals, completion certificates and scheme certificates such as FENSA. The TA6 6th edition becomes mandatory for accredited firms on 30 March 2026. Law Society: TA6 6th edition (opens in new tab)
  • Planning permission and building regulations are separate systems. A Lawful Development Certificate covers planning only and does not remove the need to comply with building regulations, and a building regulations certificate is not planning permission. GOV.UK: lawful development certificates (opens in new tab)

Common questions

What is a building regulations compliance certificate?

It is the document proving notifiable building work was signed off, either by council building control or by an installer registered with a government authorised competent person scheme (FENSA for windows, Gas Safe for boilers, NICEIC or NAPIT for electrics and others). You should receive it within 8 weeks of the work finishing, and buyers' solicitors ask for it when you sell.

How long can the council enforce against unauthorised building work?

The law changed in 2023 and many guides still state the old position. A council can now serve a section 36 notice for 10 years after completion (it used to be 12 months), and prosecution for breaching building regulations has an unlimited fine, up to 2 years, and no time limit. Missing paperwork does not quietly expire.

I lost a certificate. Do I have to redo the work?

Almost never. Most schemes reissue certificates cheaply by address or reference: FENSA charges £30, Gas Safe £7.92, and MCS £36. Council building control can copy a completion certificate for a small admin fee. Reordering is the first move before anything more drastic.

The work was never signed off at all. What are the options?

For work done after 11 November 1985 you can apply to the council for regularisation, a retrospective inspection and certificate. Solicitors sometimes discuss indemnity insurance instead; whether it applies is for your solicitor, and contacting the council first can affect it, so take advice before making calls.

This is guidance from the public rules, not legal or conveyancing advice. Your council, the scheme body and your solicitor have the final say on your situation.

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