Briefing a specialist so the fee stays fixed

A fixed fee is only fixed if the scope is fixed. When a consultant's fee for a Heritage Statement or a Transport Statement creeps, the cause is almost never that they underpriced the writing. It is that the drawings changed twice, a consultee raised something nobody scoped, and three rounds of client comments arrived in separate emails a fortnight apart.

So the instruction letter is where the money is saved. Fifteen minutes spent defining deliverable, inputs, rounds and triggers converts a range into a number, and gives you something to point at when the scheme moves.

What a fee proposal needs to price

A consultant pricing a supporting document is estimating six things, and each one is a place where a fee slips.

The deliverable: which report, to what standard or guidance, at what length, for what application type. "A noise report" is not a deliverable. "A noise impact assessment addressing plant sound to BS 4142:2014+A1:2019 at three named receptors, with a one hour attended survey and a 24 hour unattended survey, for a minor full application" is.

The inputs: what exists, what stage the drawings are at, and whether survey data is available. The assumed inputs list is the most useful part of any proposal, because everything in it that turns out to be missing is a variation.

The visits: how many, in what season, and whether the consultant has access.

The iterations: how many drafts, how many rounds of comment, and who consolidates them.

The post submission work: whether responding to consultee comments, revising after a holding objection, attending a committee or supporting an appeal is inside the fee.

The programme: a document needed in three weeks costs more than the same document needed in eight, and a survey tied to a season cannot be accelerated at any price.

Information to send at instruction

Send this as one package with one covering note, not as nine emails.

1. Site address, postcode and a red line site plan with the application boundary.
2. Existing drawings, in a usable format, and the proposed drawings with a stated design stage and revision.
3. Planning history, with application reference numbers and any decision notices and conditions.
4. Any pre application advice, in full, including the parts that were unhelpful.
5. The council's local validation checklist for the application type, and the adopted local plan policies you expect to be engaged.
6. The constraint position: flood zone, conservation area, listed building grade, tree protection, Article 4 direction, protected species records where held.
7. Survey and monitoring data already obtained, with the date it was collected.
8. Site photographs and access arrangements, including who holds keys.
9. Your programme, with the intended submission date and any fixed external dates.
10. The contact chain: who instructs, who comments, and who signs off.

Point ten matters more than it looks. Where three people can send comments and nobody consolidates, the consultant absorbs the co-ordination cost once and charges for it thereafter.

Defining rounds of comment

Say the number, say the window, and say what happens next.

A workable structure is one draft issued for comment, one consolidated set of comments returned within ten working days, and one final issue. Comments arriving after that window, or in a second uncoordinated batch, fall outside the fixed fee and are charged at an agreed rate.

Ask for the draft to be issued in a commentable format and for the consultant to return a short response schedule showing how each comment was dealt with. That schedule is useful twice: it stops comments being quietly ignored, and it becomes the audit trail if the report is later queried.

Site visits and what triggers another

One visit is the normal allowance for a narrative document. Technical documents differ: an ecology appraisal may need a visit inside a survey season, an acoustic assessment needs attended measurement at the relevant time of day, and an arboricultural survey needs canopy visible.

State explicitly what triggers a further visit and who pays: a change to the scheme layout, a change to the site boundary, a request from a consultee for additional information, or a survey window missed for reasons outside the consultant's control. Then a second visit is a priced event rather than an argument.

Consultee responses and who pays

This is the item that most often turns a fixed fee into a dispute, because it arrives weeks after everybody thought the job was finished.

Deal with it at instruction by splitting it in two. A short letter clarifying something already in the report should be inside the fee, because it reflects how clearly the report was written. Additional work, whether new measurement, further modelling or a revised assessment, is a variation. Agree an hourly or daily rate now and a notification threshold, so the consultant tells you before spending rather than after.

Where the risk is high, a capped allowance works well: a stated number of hours held for post submission queries, drawn down against a timesheet and refunded if unused.

Change control during determination

Schemes move during the eight or thirteen weeks. Write down what happens when they do.

The triggers worth naming: a revision to the drawings, a change in unit numbers or floorspace, a change to the red line, adoption of a new local plan or a new national policy edition during determination, a request from the case officer for an additional document, and a refusal leading to an appeal.

For each, say whether the existing fee covers it, whether an addendum is charged at a stated rate, and whether a fresh instruction is needed. Consultants price uncertainty into the original fee when the change position is silent, so defining it usually reduces the headline number rather than increasing it.

A model instruction structure

Use the same headings every time and you will stop forgetting things.

Project and site. Deliverable, with the standard or guidance to be applied. Application type and intended submission date. Inputs supplied, listed. Inputs not available, listed. Site visits included. Drafts and comment rounds. Post submission scope, with rates and a cap. Change control triggers. Programme, with the date the draft is required. Fee, and what it excludes. Reliance and assignment position, if a funder or purchaser will need it. Named contacts on both sides. Insurance level and expiry date.

That last pair of items is easy to add at instruction and very hard to add later, which is the argument made at more length in the guide to obtaining third party reliance.

Where an AI drafted starting point fits

A structured first draft changes what you are buying. Instead of instructing a specialist to write a document from scratch, you are instructing them to review a draft, correct it, add the technical work only they can do, and take responsibility for the result. That is a narrower scope and it can support a lower fixed fee, provided you are honest with the specialist about what the draft is.

Be honest about the limits too. A draft cannot replace measurement, a site visit, a licence, or professional judgement, and for several report types a licensed or competent professional is legally required. PlanScope drafts insert a placeholder wherever site specific facts are missing, which is deliberate: those placeholders are the specialist's scope, visible in advance. Where the site data is thin, the sequencing advice in the note on briefing a specialist when the site data is incomplete applies, and the choice between one multidisciplinary instruction and several separate ones is set out in the comparison of multidisciplinary practice and separate specialists.

Browse the 66 report types to fix the deliverable before you ask for a fee, then find a reviewer through the professional directory and check pricing for the drafting side.

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.