How Much Does Building Control Cost?
A charge set by each authority in its own published scheme, delivered in two parts, with a longer list of things it does not cover.
There is no national price. Local authority building control charges are set by each council in its own published scheme and banded by the floor area of the new work, while private sector approvers quote per job, so for a standard domestic extension the charge is a three figure sum rather than a four figure one. On the full plans route it arrives as two charges: a plan charge when the drawings are deposited, and an inspection charge after the first site visit. A building notice is a single charge up front, and regularisation of work already built is charged at a higher rate again.
There is no national price, and for a standard domestic extension the local authority charge is a three figure sum rather than a four figure one. Charges are set by each council in its own published scheme and by each private sector approver in its own quotation, so the only number worth having is the one for your floor area, from the body you are actually applying to.
What you can rely on without looking anything up is the shape of the bill, and the much longer list of things it does not cover.
It arrives as two charges, not one
On the full plans route the charge splits, which is why people think they have been billed twice.
A full plans application carries a plan charge, paid when the drawings are deposited, covering the check against the regulations and the queries that come back from it. Then there is an inspection charge, raised after the first site visit, covering every visit from the excavation through to completion. Two invoices, one application.
A building notice is a single charge paid up front, normally close to the two full plans charges added together. There is no plan check to pay for, so you are buying the same inspection service without the part that catches an undersized beam before it has been ordered.
A regularisation application, for work already built, is charged at a higher rate again. Whichever route you are on, check whether the figure quoted includes VAT, because schemes publish it both ways and the difference is a fifth.
| Route | How the charge falls |
|---|---|
| Full plans | Plan charge on deposit, then an inspection charge after the first visit |
| Building notice | One charge up front, close to the two full plans charges combined |
| Regularisation | A higher rate again, for work already built |
What actually moves the number
Five things, and the structural complexity of the job is not usually one of them.
- Floor area. Domestic schemes are banded by the area of the new work, and the bands are wide. A 41 square metre extension can sit a band above a 39 square metre one for reasons that have nothing to do with how hard it is to build.
- The route. Full plans, building notice or regularisation, as above.
- How many applications. An extension and a separate garage conversion are two pieces of work, and if they are not applied for together they are charged separately.
- Whether the work is standard. Schemes publish set charges for ordinary domestic work and individually determined charges for anything outside it: a basement, an unusual structure, anything needing specialist checking. Individually determined means quoted, and quoted means variable.
- Who you appoint. A registered building control approver prices per job and can take account of complexity, distance and programme in a way that a banded council scheme cannot. It can come out lower or higher.
Repeat visits are the sixth item and the avoidable one. A surveyor who arrives to inspect a foundation that is not ready has still made a visit, and some schemes charge for re-inspection. That is a scheduling problem rather than a building one, and it is the reason inspections are booked against the programme rather than the morning they are needed.
What does not usually move the council’s number is difficulty. A straightforward 30 square metre extension on good ground and an awkward one on clay next to a mature oak sit in the same band, because the band is measured in square metres. The difficulty shows up in the groundworks and the engineer’s fee instead, which is where it belongs.
What the charge does not include
This is where the figure people were quoted stops matching the figure they pay.
The building control charge buys the plan check, the inspections and the certificate at the end. It buys nothing else. Separate from it, and between them usually several times larger:
- the drawings, priced by the technician or architect who produces them. What the drawing package actually consists of is set out separately
- the structural engineer’s calculations for the foundation, the beam and the padstones
- the planning fee, which is set nationally rather than by the council: what a planning application costs
- a build over agreement where the extension sits over or near a public sewer, which is the water company’s charge and nothing to do with building control
- a party wall surveyor’s fees, where a notice is dissented from
- electrical certification, unless the work is notified through the same application
- a calculation demonstrating compliance where the glazed area exceeds the standard allowance under Part L, rather than the assumption that it does
None of those becomes optional because the building control charge has been paid.
Where it sits against the rest of the job
Set against an extension measured in tens of thousands, this is the smallest statutory line on the schedule, and it produces the document with the longest working life. It is also the one line where saving the money reliably costs more later.
The expensive version
Regularisation is not the same charge paid late. It is a different and larger bill.
Work built without notification can usually be put on record afterwards, but the charge itself is the cheap part. You pay for drawings of something that already exists, for opening up so the foundation and the structure can be seen, often for a structural engineer’s report to support the application, and for making good afterwards. Where the work falls short of the standard, you pay to bring it up. The point at which this normally surfaces is a sale, with a chain waiting on it.
Getting a real figure rather than a range
Three pieces of information turn this from an estimate into a price.
What the work is, the floor area of it in square metres, and which route you are using. With those, the published scheme gives an exact number in about a minute, and it is a number rather than a range. Anyone quoting you a national average for this is guessing at something they could look up.
We do that at survey stage on every job, alongside the planning position, so the statutory costs sit on the quotation from the start instead of appearing later as surprises. How the application is run, and who deals with the queries when they come back, is set out on the Building Regulations page.
Published charges are revised periodically and vary between authorities. Treat the structure described here as reliable and any figure as something to confirm against the current scheme for your address.
Last reviewed August 2026.
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