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All building control and approved inspectors

Building control in Hertfordshire

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

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Appointing a building control provider in Hertfordshire

Hertfordshire councils share building control through Hertfordshire Building Control, and private registered approvers also operate across the county. Either route can check your plans, inspect the work and certify it.

Property you'll be working with in Hertfordshire

Victorian and Edwardian terraces in St Albans and Hitchin, interwar semis, new-town housing in Stevenage, Welwyn and Hatfield, and larger detached homes in the commuter belt. Clay soils and mature trees affect foundation design.

Planning in Hertfordshire

Green Belt covers much of the county, and conservation areas are common in historic towns — so check planning first. Building regulations approval is still needed for extensions and structural work even under permitted development.

What building control and approved inspectors charge in Hertfordshire

Roughly £450 to £950 for a single-storey extension in 2026 and £500 to £1,000 for a loft conversion. Regularising work already done typically costs 20–50% more.

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

How to choose a building control provider in Hertfordshire

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 Hertfordshire 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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