What are building control fees?

Building control fees cover the cost of having your building work checked for compliance with UK Building Regulations. Fees are split into two parts: a plan check fee (paid when you submit your application) and an inspection fee (paid when work starts on site). Both are subject to VAT. Fees vary by local authority.

Do I need building control for an extension?

Yes, all extensions require a Building Regulations application regardless of whether planning permission is needed. Even if your extension falls within permitted development, it must still comply with Building Regulations covering structure, thermal performance, drainage, fire safety and ventilation.

What is the difference between building control and planning permission?

Planning permission controls what you build, where you build it and how it looks. Building Regulations (enforced by building control) ensure what you build is safe, structurally sound, energy efficient and accessible. You may need both, either, or neither depending on the project.

Can I use an Approved Inspector instead of council building control?

Yes. You can choose either your local authority building control service or a private Approved Inspector. Private inspectors may offer faster turnaround and more flexible inspection scheduling. Fees are comparable. Both carry the same legal authority to approve or reject work.

How accurate are these fee estimates?

These are indicative estimates based on typical UK local authority charges. Actual fees vary by council and are updated annually. Some councils publish their fee schedules online. For an exact quote, contact your local authority building control department or request a quote from an Approved Inspector.

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Building Control Fee Calculator — Inspection Costs

Estimate UK building control fees for extensions, loft conversions, new builds and other building regulation applications.

Project Type

Select the type of building work

Floor Area (optional)

New or extended floor area

Estimated Project Cost (optional)

Total construction cost estimate

How We Calculate This

This calculator provides indicative building control fee estimates based on typical UK local authority charges for common domestic projects.

Fee structure

Plan check fee: Paid on submission — covers reviewing your plans for compliance
Inspection fee: Paid when work starts — covers site inspections during construction
VAT: Both fees are subject to 20% VAT

Fee adjustments

Fees are adjusted upwards for larger floor areas (over 60m²) and higher project costs (over £100,000). These adjustments reflect the additional plan checking and inspection time required for larger or more complex projects.

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Last updated: March 2026

All calculations are estimates. Verify with your supplier.