How Much Does Building Regulations Approval Cost?

Building Regulations approval fees in England are set by each local authority (or by the private approved inspector you choose), so there's no single fixed national price list — but as a broad steer, simple work like a small structural alteration might sit in the low hundreds of pounds, while a full house extension can run to several hundred or over a thousand pounds once plan-checking and inspection fees are combined. Always get the exact figure from your local authority or approved inspector before committing, since it genuinely varies by council and by project size.

What you're actually paying for

Building Regulations fees generally cover two separate elements:

• Plan checking fee (if going the full plans route) — for reviewing your drawings and design before work starts.
• Inspection fee — for the site visits carried out at each stage, as covered in our guide to what Building Control inspections involve.

A building notice (the lighter-touch alternative to full plans) typically has a simpler, often single, fee structure, but doesn't include the same upfront design-checking service.

What affects the cost

• Project size and value — most local authorities scale fees to the estimated cost or floor area of the work, so a small alteration costs less than a full-house extension.
• Local authority vs approved inspector — private approved inspectors compete on price and service, so it's worth getting quotes from both where relevant, particularly on larger projects.
• Full plans vs building notice — full plans generally cost more upfront (because of the plan-checking element) but reduce the risk of design issues surfacing mid-build.

Is this cost worth budgeting in from the start?

Yes — Building Regulations fees are a genuine, unavoidable cost on notifiable work, not an optional extra, and skipping them isn't a real cost-saving option given the risks covered in our guide to renovating without approval. It's worth getting the exact fee from your local authority as part of early project budgeting, alongside broader costs like those in our bathroom renovation cost guide or extension Building Regulations guide.

Getting an accurate figure for your project

Because fees genuinely vary by council and by project value, the only reliable way to get an accurate number is to contact your local authority's Building Control department directly (most publish a fee schedule or calculator on their website) or ask your chosen approved inspector for a quote. Many will give you an estimate over the phone once you describe the scope of work.

Is it worth using an approved inspector for cost reasons?

Not necessarily — approved inspectors aren't always cheaper than the local authority, and price shouldn't be the only factor. Consider responsiveness, local knowledge of common issues in your area's housing stock, and how easy they are to reach when you need an inspection booked quickly to keep your project on schedule. A slightly higher fee for a service that keeps your build moving is often better value than the cheapest option.

Budgeting alongside the rest of your project

Building Regulations fees are typically a small fraction of overall project cost on a full renovation, but they're easy to forget when budgeting since they're paid separately from your builder's invoices. Add the fee as its own line item early in your planning, alongside other fixed costs like structural engineer's reports.

Common mistakes

• Assuming one flat national fee exists. It genuinely varies by local authority — always check with yours directly rather than relying on a figure from a different area.
• Forgetting to budget for it separately from the build cost. Building Regulations fees are paid to Building Control, not your builder, and are easy to overlook when pricing a project.
• Choosing the cheapest option without checking service quality. Especially with approved inspectors, price isn't the only factor — responsiveness and local knowledge matter for keeping your project on schedule.