What a planning agent charges and what you get

A planning agent's fee on a householder extension is a professional charge for preparing and running the application. It is separate from the council's application fee, separate from the architect's drawings, and separate from any specialist report the site turns out to need. Confusing those four costs is the single most common reason homeowners feel misled, so the first thing to ask any agent is which of them the quote covers.

The title planning agent is not protected, so the range of people operating under it is wide: chartered town planners, architectural technologists who also handle submissions, former council officers working independently, and firms whose service is form-filling. The fee tells you less than the scope does.

What an agent does on a small application

On a rear extension or a loft conversion with dormers, the work breaks into five parts. Checking whether permission is needed at all, including the permitted development limits in Schedule 2 Part 1 of the General Permitted Development Order 2015 and any Article 4 direction or condition that removes them. Reading the adopted local plan and any householder design guide for the policies the officer will cite. Assembling the submission so it validates first time. Writing the supporting statement that connects the design to those policies. Then handling the case: neighbour objections, the officer's queries, and any amendment needed to secure a recommendation.

The fifth part is where experience shows. An officer raising a concern about a flank wall window or the depth of a side extension at week four is offering a negotiation, and recognising that is worth more than the drafting.

What an agent does not do is design the building or produce the drawings, unless they also hold an architectural qualification and have quoted for it. Keep that boundary clear in writing.

Fixed fee against hourly arrangements

Most householder work is quoted as a fixed fee, and that suits a predictable scope. A fixed fee should state the number of rounds of amendment included, whether neighbour correspondence is covered, and what happens if the application is refused.

Hourly rates appear where the scope cannot be known in advance: an unauthorised structure needing a lawful development certificate, a listed building where the extent of consent is unclear, or a site with a planning history of refusals. Ask for an estimated range and a cap, and ask to be told when half the estimate is spent.

The arrangement that causes trouble is a low fixed fee with everything chargeable as an extra. A quote of a few hundred pounds that excludes the supporting statement, excludes dealing with objections and excludes any resubmission is not a lower-cost version of a full service. Compare scopes line by line, not headline figures.

Drawings, reports and who produces them

A householder application needs a location plan, a block plan, existing and proposed floor plans and elevations, and usually a supporting statement. Someone has to measure the house and draw it. A surveyor or architectural technologist producing a measured survey and the application drawings is a separate appointment in most cases, and the cost depends on the size and complexity of the building rather than on the extension.

Specialist reports sit outside the agent's fee almost without exception. A householder scheme can pull in a flood risk assessment, an arboricultural impact assessment where a protected tree is nearby, a heritage statement in a conservation area, a bat survey where roof works affect a potential roost, or a daylight and sunlight assessment where a neighbour's windows are close. Consultant quotes for a single narrative report commonly run from around £500 to £2,500 depending on the report type and the site, and technical surveys cost more because they involve fieldwork.

That is the budget line that surprises people. Scoping it early is the fix. Running the 66 report types by category against your constraints before you appoint anyone tells you which specialists you may need.

Where an agent saves more than the fee

Three savings are real and measurable.

Validation is the first. An invalid application is not refused, it simply sits until the missing item arrives, and on a householder scheme that can cost a month of the build programme. Every authority publishes a local validation list in addition to the national requirements, and the items that catch people out are ownership certificates, drawing scales, and a plan showing the application site edged red with the whole of the applicant's adjoining land edged blue.

The second is avoiding a refusal that becomes planning history. A refusal on a householder application is not fatal, but it sits on the record and the next officer reads it. Resubmission within twelve months of a refusal on substantially the same development is normally free of a further application fee, which softens the cost but not the delay.

The third is the levy. Residential extensions are usually exempt from the Community Infrastructure Levy, but the exemption has to be claimed before development starts and the paperwork order matters. Missing the sequence turns an exemption into a bill, and our note on the levy and residential extensions explains where the threshold sits.

What is excluded from a typical quote

Read the exclusions before the inclusions. The items that are nearly always outside a householder quote are the council's application fee, measured surveys and drawings, structural engineering, specialist reports and surveys, building regulations submissions and inspection charges, party wall matters under the Party Wall etc. Act 1996, discharge of planning conditions after approval, and any appeal.

Building control is its own charge and its own process, decided by a building control body rather than the planning authority, and the two run on different timescales. The separate cost of that is covered in our note on building control charges alongside the planning fee.

Discharge of conditions deserves a specific question. A permission with six conditions to discharge before work starts needs applications to discharge them, each with its own fee and its own eight-week clock. Ask whether the agent's fee covers those, because that is the stage where homeowners most often find themselves alone with a condition about materials and a builder waiting.

Appeals and whether they are covered

Almost no householder fixed fee includes an appeal, and you should not expect it to. A householder appeal under section 78 of the Town and Country Planning Act 1990 must be submitted within twelve weeks of the decision for householder development, which is shorter than the six months that applies generally, and it runs on the written representations procedure.

Ask the question before you appoint, and ask it in this form: if this is refused, what would you charge to advise on prospects, and what would you charge to run a written representations appeal. A short written prospects opinion is often the better purchase, because a weak appeal costs twelve weeks and gains a second refusal on the record.

The application fee for an appeal is nil. The cost is professional time and, where the authority behaves unreasonably, there is a costs regime, though awards in householder cases are uncommon.

Questions to ask before appointing

Ask for the scope in writing, with the exclusions listed. Ask who will actually handle the case rather than who is quoting. Ask whether they are a member of a professional institute and what the complaints route is, since the title alone guarantees nothing. Ask for two recent decisions on comparable schemes in the same authority, with the reference numbers, so you can read the officer reports yourself on the council's public register.

Then ask what the application fee will be, and check it yourself. Planning fees in England are set in regulations and have been subject to annual indexation each April since 2025, so any figure quoted from memory may be out of date. The current householder figure is published on the Planning Portal fee calculator and in the fee regulations, and our note on how fees are indexed each April explains the mechanism.

Illustrative example: a single-storey rear extension on a 1930s semi in a conservation area. The agent quoted a fixed fee for the submission and case handling, the technologist quoted separately for the measured survey and drawings, and the heritage statement was a third cost. Three invoices, one application. The figures will differ on your site, and this example is illustrative only.

Where the narrative documents are the cost you want to control, PlanScope pricing gives you one free report, £50 per report, or £150 per month for unlimited reports, and the drafts cite policy and flag where site facts are missing. Enter your postcode on PlanScope to see which reports your project is likely to need before you commission anything.

This is general guidance, not legal advice. Fees and local requirements change, so check the current fee schedule and 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. For specialist technical reports, qualified professional input may be required.