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All building control and approved inspectors

Building control in London

39 practices covering London. Listings are business information researched by Renovome; contact details and matching happen inside Workspace.

Which London building control service should I use?

Start with your property's postcode to find the relevant borough council. For work outside the higher-risk building regime, you can compare the council route with a registered building control approver. Ask how to book inspections and whether the quote covers plan checking, site visits and the final certificate. Planning permission is a separate decision.

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Appointing a building control provider in London

Every London borough has its own building control team, and private registered approvers are widely used. For terraced homes the building control process usually runs alongside party wall procedure.

Property you'll be working with in London

Victorian and Edwardian terraces, converted flats, mansion blocks and interwar semis. Basements, rear and side-return extensions and loft dormers are the most common projects inspectors see.

Planning in London

Conservation areas and Article 4 directions are widespread, and flats have no householder permitted development rights. Flat conversions bring extra fire-safety and sound-insulation checks.

What building control and approved inspectors charge in London

Roughly £500 to £1,100 for a single-storey extension in 2026 and £550 to £1,200 for a loft conversion; basements cost more.

Indicative 2026 ranges and local context, not quotations or planning advice. Last reviewed: September 2026.

How to choose a building control provider in London

Every extension, conversion, structural opening and rewire needs building control approval, either through your council or a registered building control approver. Arrange it before work starts.

  1. Decide between your local authority and a registered building control approver early.
  2. Confirm how many inspections are included and what triggers an extra charge.
  3. Ask how much notice they need for each inspection stage.
  4. Keep the completion certificate: you will need it when you sell.
  5. Check who notifies the council if you use a private approver.

What building control and approved inspectors in London typically work on

  • Full plans checks
  • Building notice inspections
  • Structural, drainage and insulation inspections
  • Regularisation of work done without approval
  • Completion certificates

Typical 2026 fees for building control and approved inspectors

ItemTypical 2026 cost
Building notice, small works£350 - £750
Full plans, extension£700 - £1,500
Loft conversion£700 - £1,400
Regularisation certificate£800 - £2,000
Air tightness or SAP assessment£250 - £700

Indicative 2026 UK ranges, not quotations. London and the South East usually sit at the top of each range. Last reviewed: September 2026.

Common questions

Is building control the same as planning permission?
No. Planning controls what you may build; building control checks that it is built safely and to the regulations. Many projects need both.
What does building control cost in 2026?
Around £700 to £1,500 for a typical domestic extension on a full plans application.

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