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Building

Expert advice on structural work, home extensions, renovations and understanding building regulations.

Building

Home Improvements - Getting Building Regulation Approval

Previously we looked at Building Regulations and how they are designed to ensure that building works meet set standards of safety, access and fuel efficiency. This time we take a look at how you can go about getting Building Regulations Approval.

Previously we looked at Building Regulations and how they are designed to ensure that building works meet set standards of safety, access and fuel efficiency. This time we take a look at how you can go about getting Building Regulations Approval.

Getting Building Regulations Approval

In short, there are two ways that you can get your home improvements signed off by Building Regulations. Minor works can be self-certified by traders registered with the relevant Competence Persons Scheme. Major building works need to be signed off by Building Control Body (BCB) – this can be your Local Authority or a private BCB.

Getting Building Control Approval

If you have undertaken significant works which could impact the structure of the building, such as conversions, underpinning, cavity wall insulation or extensions, you will need to get the work signed off by Building Control Officers. There are three types of approval: full plans application, building notice, or regularisation.

Full Plans Application

A Full Plans Application is the most thorough and is especially important for major works on domestic properties and all commercial works. This application shows full construction details via detailed plans, drawings and other relevant information. When you submit a full plans application, you will usually need to pay a fee. Once the works are approved, you can start work - onsite inspections will be undertaken and final Building Regulations approval will be granted within 8 weeks of the works being completed, providing the work is compliant with the original approved plans. Further inspection and approval fees will be charged during the process.

Building Notice

You can use a building notice for minor works, such as replacement windows (if you haven’t used someone registered with FENSA), or minor alterations. You can’t use a building notice for any work on commercial premises. With a building notice, there is no need to submit full plans for approval and you can start work two days after you have submitted your notice. Your plans won’t be formally approved, as they are with a full plans notice, but a Building Control Office may inspect the works while they are under way and will approve the works on completion.

Regularisation

For completed building works undertaken after 1985, and which have not been granted Building Regulations Approval, it is possible to have the works inspected retrospectively. Your BCB may need you to make changes before they issue the regularisation certificate.

Costs of Building Regulation Applications

Fees are set by the BCB and usually have an initial fee, plus a fee for site visits. The total cost will depend on the size and scale of the work being undertaken. Usually, full plans applications and building notice approval cost the same.

For further advice on Building Regulations, consult your tradesperson or contact a local building surveyor.

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Find clear, practical answers to common building questions, helping homeowners understand everyday issues, know what checks they can carry out safely, and when it is best to contact a qualified professional.

  • Do I need planning permission for a home extension?

    Plenty of extensions don't need planning permission - they fall under Permitted Development. Whether yours qualifies depends on the size, location, and type of build. Single-storey rear extensions up to four metres on a detached house often get the green light, but side extensions, two-storey builds, and properties in conservation areas usually do need permission. Always check with your local planning authority before you start - building without the right approvals can mean being made to undo it all.

  • What is involved in building a conservatory?

    You're looking at groundworks and foundations, the frame and glazing, the roof, and then the internal fit-out - flooring, heating, electrics. Most conservatories under a certain size fall under Permitted Development, but they still need to comply with Building Regulations, especially if you want to use the space as a proper room year-round. On the roof: solid or tiled options make a huge difference to usability - traditional polycarbonate can be unbearably hot in summer and freezing in winter. Most projects take two to six weeks.

  • Do I need a structural engineer for my home renovation?

    Not for everything - but if structural changes are involved, yes. Removing a load-bearing wall, putting in a steel beam, touching the roof structure, or adding a sizeable extension all need a structural engineer to design the solution and produce the calculations for Building Regulations approval. A builder might tell you whether a wall is load-bearing, but only a structural engineer can specify the right beam and carry professional liability for that advice.

  • Do I need planning permission to install patio doors?

    Usually not, if you're replacing an existing door or window in the same opening - that typically falls under Permitted Development. But if you're making the opening larger or creating a new one in an external wall, you may need planning permission or Building Regulations approval. Conservation areas, listed buildings, and properties with an Article 4 Direction have tighter rules, so check before assuming. Any structural work to the opening, like fitting a new lintel, needs Building Regs sign-off regardless.

  • Does my extension need Building Regulations approval even without planning permission?

    Almost always, yes. Planning permission and Building Regulations are two separate things. Extensions need to meet regulations covering structural integrity, fire safety, insulation, ventilation, and drainage - regardless of whether you needed planning approval. Your local authority's building control team can confirm exactly what's required. And don't skip it - missing Building Regs sign-off can cause real headaches when you come to sell.

  • How long does a typical home extension take?

    A small single-storey extension usually takes eight to twelve weeks from groundworks to completion. Add several months if planning permission is needed before work can even begin. Bigger builds - two-storey additions or anything needing significant structural work - can take four to six months or more. Get a realistic timeline from your builder upfront, and factor in a buffer for the unexpected.

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If you have a question in relation to TrustATrader specifically, please check out the TrustATrader FAQs, with separate lists tailored to consumers and tradespeople. Alternatively, get in touch with our team. We're happy to help!