Updated 17 July 2026. This guide explains the usual building-regulations route for home renovations in England. Building control is devolved, so projects in Wales, Scotland, and Northern Ireland must use the rules and authorities for that nation. It is practical planning information, not a substitute for advice from your building control body or a qualified designer.
Building regulations set minimum standards for matters such as structure, fire safety, ventilation, sanitation, drainage, energy efficiency, electrical safety, and access. They are separate from planning permission: a renovation can need building-regulations approval even when it does not need planning permission, and some projects need both.
Which renovation work commonly needs approval?
According to the current GOV.UK building-regulations guidance, approval may be required for extensions and structural changes as well as many alterations. The list below is a starting point, not a complete legal test.
| Renovation work | Why building control may be involved | What to check before work |
|---|---|---|
| Removing or altering a load-bearing wall | Structure, loads, support, and fire separation | Structural design and the approval route |
| Loft or garage conversion | Structure, stairs, escape, insulation, ventilation, and fire safety | Whether planning permission is also needed |
| New bathroom or plumbing alterations | Sanitation, water safety, drainage, ventilation, and electrics near a bath or shower | Drainage route, ventilation, and notifiable electrical work |
| Replacement windows or external doors | Thermal performance, safety glazing, ventilation, and means of escape | Building control or a registered competent-person installer |
| New or replacement heating system | Energy efficiency, combustion safety, and controls | Whether a registered installer can self-certify |
| Fuse box replacement or certain electrical work | Electrical safety under Part P | Notification and certification route |
| Roof covering replacement or major insulation work | Structure, moisture, fire performance, and energy efficiency | Extent of replacement and applicable exemptions |
GOV.UK specifically lists work such as replacing fuse boxes, installing bathrooms involving plumbing, changing electrics near a bath or shower, replacing windows and doors, replacing roof coverings, and installing or replacing heating systems. If the project is not listed, that does not mean it is exempt. Ask a building control body before committing to the design or start date.
Building regulations are not planning permission
Planning permission considers whether development is acceptable in planning terms. Building regulations concern how the work is designed and constructed. Permitted development rights can remove the need for a planning application in some circumstances, but they do not remove any building-regulations duty. Listed buildings, conservation areas, leasehold conditions, party-wall duties, and restrictive covenants can create separate requirements.
Choose the approval route before starting
For work in England that is not a higher-risk building project, GOV.UK says you can normally use your local authority building control department or a private registered building control approver. The main application routes are:
- Full plans: detailed plans are assessed before work proceeds. GOV.UK describes this as the most thorough option.
- Building notice: available for some smaller projects, without the same formal plan approval. It is not appropriate for every job.
- Regularisation: retrospective approval through a local authority for eligible unauthorised work carried out after 11 November 1985. Opening-up or corrective work may be required.
Read the current GOV.UK application guidance and confirm the route with the relevant building control body. Do not assume that starting under a building notice means the design is already approved.
When a competent-person installer can self-certify
Some types of work can be completed and self-certified by an installer registered for that work under a competent person scheme. Examples can include certain electrical, heating, window, door, roofing, or insulation work. Registration must match the work being carried out; a general trade description is not enough.
GOV.UK says a registered installer will notify the local authority where required and provide a compliance certificate. Check the installer through the relevant register and keep the certificate with the property records. See the official guide to using a competent person scheme.
The Approved Documents: Parts A to S
The Approved Documents give statutory guidance on ways to meet the functional requirements of the Building Regulations in England. Common renovation topics include Part A (structure), Part B (fire safety), Part F (ventilation), Part G (sanitation and water safety), Part H (drainage), Part L (energy efficiency), Part M (access), and Part P (electrical safety). They are guidance rather than a one-size-fits-all specification; the relevant building control body assesses compliance for the actual project.
Use the current GOV.UK Approved Documents collection. Editions and amendments change, so avoid designing from an old downloaded copy without checking the publication page.
A homeowner checklist before work begins
- Write a precise scope, including structural, drainage, electrical, heating, ventilation, window, and insulation changes.
- Check planning permission and building regulations separately.
- Ask the building control body which approval route and documents are required.
- Verify that designers, contractors, and installers are competent for their appointed work.
- Agree who submits notices, books inspections, records design changes, and collects certificates.
- Do not conceal work that must be inspected before the inspection takes place.
- Keep approved plans, calculations, inspection records, installer certificates, warranties, and the completion certificate together.
What happens if work is not compliant?
Non-compliant work can require correction and can create enforcement, safety, insurance, mortgage, or property-sale problems. GOV.UK warns that the person doing the work can be prosecuted and fined, and the relevant building control body can require faulty work to be corrected. Missing certificates can also become an issue when the property is sold.
If work has already been completed without the required route, contact the local authority building control team before covering or altering evidence. Regularisation may be possible for eligible work, but it is not automatic and may require opening-up, testing, or remedial construction.
Frequently asked questions
Do I need building regulations approval for a new bathroom?
It may be required when the project involves new plumbing, drainage, ventilation, structural work, or electrical work near a bath or shower. Confirm the scope with building control and use appropriately registered installers.
Does permitted development remove the need for building regulations?
No. Planning permission and building regulations are separate systems. A project that is permitted development can still require building-regulations approval.
Who gives approval in England?
For most ordinary home renovation work, the route is through the local authority building control department or a private registered building control approver. Higher-risk buildings follow a separate Building Safety Regulator process.
Which certificates should I keep?
Keep the completion certificate and any competent-person, electrical, heating, glazing, or other compliance certificates relevant to the work, together with approved plans, structural calculations, and warranties.
Official sources: when approval is needed; how to apply; competent person schemes; and the Approved Documents.