What a householder planning application really costs

The householder planning application cost that people quote each other is the council fee, and that is usually the smallest line in the budget. The fee is fixed nationally. Everything else moves: measured survey and drawings, any supporting statements the validation list asks for, specialist reports triggered by what is on or near your site, and a separate Building Regulations charge that has nothing to do with planning at all.

Budget for the stack, not the fee. A rear extension that needs nothing beyond drawings and a short statement sits at one end of the range, and the same extension behind a listed terrace with a protected tree in the garden sits somewhere else entirely.

The application fee and when you get it back

Householder fees are set by the Town and Country Planning (Fees for Applications) (England) Regulations 2012 as amended. The figures were uplifted in December 2023 and are indexed annually from April, so check the current schedule on the Planning Portal fee calculator before you write a cheque rather than repeating a figure from a forum post.

Two provisions are worth knowing before you pay.

The first is the free go. If your application is refused or withdrawn, one further application for substantially the same development on the same site by the same applicant within 12 months of the decision attracts no fee. Agents plan around this, and homeowners often waste it by submitting a fresh scheme that has drifted too far from the original.

The second is the refund where the authority fails to determine the application within 26 weeks. Exceptions apply, including where an extension of time has been agreed, and in practice most householder applications are decided inside eight weeks anyway.

Fees get complicated when a proposal spans more than one category, and applications covering more than one category are charged differently from a single householder submission.

Drawings and the survey behind them

Nobody can quote drawings properly without knowing whether a measured survey exists. That is the honest answer to why quotes vary so much for what looks like the same job.

For a straightforward extension you need existing and proposed plans and elevations, a site plan at a recognised scale, a location plan with the application site edged red, and enough section detail to show ridge and eaves heights against the neighbouring property. If the house has been extended before, or the ground falls across the plot, the survey takes longer and the drawings carry more risk.

Get two or three quotes and ask each one the same three questions. Does the price include a measured survey. Does it include the planning submission and dealing with officer queries. Does it include Building Regulations drawings, which are a different and more detailed set.

Supporting statements and when they are actually needed

Householder applications rarely need a formal statement. Design and access statements are required for householder development only in limited cases, mainly listed building consent and some work in conservation areas, so check the council's local validation list rather than assuming.

Where a statement does help, it is usually a short Planning Statement dealing with the policies the officer will apply: the design guidance in the adopted local plan, any householder design supplementary planning document, and neighbour amenity. Consultant quotes for that work commonly run from £500 to £2,500 depending on the complexity of the site and the practice writing it.

PlanScope exists in that gap. The published price is one free report, then £50 per report, and the Professional tier at £150 per month or £600 per year for agents producing them regularly. See pricing for what each tier includes.

Reports that constraints trigger

This is the part of the budget that a homeowner cannot forecast without checking the site. A conservation area, a listed building, a Tree Preservation Order, Flood Zone 2 or 3, or a nearby watercourse each brings its own evidence requirement.

Specialist survey work has a floor price because it involves a qualified person visiting the site. Ecology also has a season. A preliminary roost assessment can happen at any time of year, but if it finds evidence and emergence surveys are needed, those run between May and September, and that can hold a project for months rather than weeks.

Building Regulations are a separate bill

Planning permission and Building Regulations approval are different systems with different fees, different assessors and different timescales. Your planning fee buys you nothing under the Building Regulations.

Charges are set by each building control body, whether that is the local authority or a registered building control approver, and they typically split into a plan check charge and an inspection charge. Ask for the full schedule for your project type, because the inspection element is the larger of the two on most extensions.

Structural calculations, a party wall surveyor where the Party Wall etc. Act 1996 applies, and any drainage build over agreement with the water undertaker also sit outside the planning fee.

What revisions and conditions cost

Two things quietly inflate householder budgets. The first is redesign during determination, when the case officer asks for a lower ridge or a smaller rear projection and the drawings are reissued. The second is conditions.

A pre-commencement condition requiring materials samples, a construction method statement or a tree protection plan means more consultant time after the decision notice arrives, and there is a fee for discharging conditions. The cost of a condition you did not negotiate usually exceeds the cost of arguing about its wording before the decision is issued.

One piece of good news. Residential extensions of less than 100 square metres of new floorspace are exempt from the Community Infrastructure Levy, but the exemption has to be claimed in writing before development starts, and the claim is lost if work begins first.

An illustrative budget for a rear extension

This example is illustrative. It shows the shape of a budget rather than a quotation, because three of the five lines are set by your own suppliers.

1. Application fee: the current householder figure from the fee schedule.
2. Measured survey and planning drawings: quoted by your designer.
3. Supporting statement where the validation list requires one: £500 to £2,500 from a consultant, or the published PlanScope price.
4. Specialist reports: only where a constraint applies, priced by the specialist.
5. Building Regulations plan check and inspection: quoted by your building control body.

Add a contingency for one round of revisions. If you are working to a fixed budget, spend the first hour of it checking constraints rather than drawing, because a heritage or tree issue found in week one is a design decision and the same issue found in week nine is a resubmission.

Enter your postcode on PlanScope to see which of the 66 report types your site is likely to need before you commission anything.

This is general guidance rather than legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.