Conflicts of interest when your designer writes the reports
Advocacy documents are expected to argue for the scheme. Assessment documents are meant to report what the method produces. The conflict lives in the second group.
Your architect can write the planning statement. Whether they should write the daylight assessment for their own scheme is a different question, and on a contested application it is the question an objector's consultant will ask first. A consultant conflict of interest in planning does not make a report inadmissible. It changes the weight an officer or an inspector gives it, and on finely balanced judgements weight is the whole game.
The problem is narrower than it first appears. Nobody objects to the designer describing the design. The difficulty arises where the same person both creates the proposal and assesses whether it is acceptable against a technical standard.
Where the conflict actually arises
Documents in a planning submission fall into two kinds. Advocacy documents explain and argue for the scheme: the planning statement, the design and access statement, the heritage justification. Assessment documents measure the scheme against a benchmark and report the result, whether it passes or fails.
The conflict lives in the second group. A daylight and sunlight assessment produces numbers against a published benchmark. So does an overheating assessment, a noise assessment, a viability appraisal and an ecological impact assessment. The author is meant to report what the method produces, and the designer has an interest in what it produces.
No conflict arises from the designer writing the argument. Everyone expects advocacy from an applicant's planning statement, and the officer reads it as such.
The assessments where it matters most
Three types attract the most scrutiny.
Daylight and sunlight sits at the top, because the method allows judgement in the modelling assumptions, the choice of which rooms to assess and the treatment of existing obstructions. A Daylight and Sunlight Assessment prepared by the design team on a scheme that just meets the benchmark invites the objection that the assumptions were chosen to produce that result.
Viability is second, and the sector has already responded to it. National guidance expects viability evidence to be prepared transparently and made publicly available, precisely because the inputs can be set to produce a chosen answer. Councils routinely commission their own review of a Viability Assessment at the applicant's cost, which is an institutional admission that the author's independence cannot be assumed.
Ecology is third, though for a different reason. Professional codes in ecology require findings to be reported honestly even where they damage the client's position, and the reputational consequence of a surveyor who never finds bats is understood within the profession.
What councils do when they notice
Responses vary and none of them is automatic.
- Nothing, on an uncontested application where the numbers are comfortable.
- A request for the underlying model or data so the officer's own consultant can check it.
- An independent review commissioned by the council, with the cost recharged to the applicant under an agreement.
- Reduced weight in the officer's report, expressed as a sentence about the assessment being prepared by the applicant's design team.
That last one is the quiet risk. It rarely refuses an application on its own, but on a decision that turns on whether harm is acceptable, a reduction in weight can be decisive at committee or on appeal.
Disclosure and how to handle it
Say it in the report. A short statement naming the author, their qualifications, their role on the project and their relationship to the design team costs a paragraph and removes the argument that something was concealed.
Where the author is part of the design team, the paragraph should also state the method followed, the standard applied and the fact that the results are reported as produced. That is a normal professional statement rather than a defensive one, and the institutes' codes of conduct already require members to declare conflicts to their clients.
Concealment is what causes damage. An assessment presented as independent, from a trading name that turns out to be a subsidiary of the design practice, is the version that ends up in an objector's submission with a covering letter about transparency.
When an independent author is worth the cost
Four situations justify the additional fee.
- The scheme is finely balanced against the benchmark, so the assumptions carry the outcome.
- The application is contested, with an organised objection group or a consultant instructed against it.
- An appeal is likely, because evidence at inquiry carries a duty to the inspector that sits above the duty to the client, and an author who has been designing the scheme for two years is an uncomfortable witness.
- The authority has a published expectation of independent evidence for that document type.
Outside those, the cost is hard to justify on a scheme that comfortably meets every test.
There is a less costly version of the same protection. Commission the assessment early, before the design is settled, from whoever will produce it. An assessment used as a design tool rather than as a justification tends to be defensible, because the numbers shaped the scheme instead of the scheme shaping the numbers.
Peer review as the middle route
Between full independent authorship and doing nothing sits peer review: the design team prepares the assessment, and an independent specialist in the same discipline reviews the method, the assumptions and the conclusions, then issues a short statement.
It is a proportionate answer and it works, provided the reviewer is free in practice to disagree. A review that cannot recommend a change is not a review. Agree in the appointment that the reviewer's statement will be submitted whatever it says, which sounds uncomfortable and is the only version with any value.
The professional directory is one route to a reviewer who is not connected to the design team. For technical assessments with their own competence requirements, such as the modelling behind an overheating assessment, the question of who is qualified to do the work comes before the question of independence, and we look at that in who can prepare an overheating assessment to TM59.
Documenting the separation
Where a practice offers both design and assessment services, separation has to be visible in the paperwork rather than asserted in a sentence.
Use separate appointments with separate scopes. Name the assessment author and state that they did not contribute to the design. Keep the assessment's data and model files capable of being released to a third party without the design files. And record the date each assessment was run against the design revision it assessed, because the commonest real problem is not bias at all. It is an assessment run against a superseded layout and never updated.
That last point is worth sitting with. Most flawed assessments in planning submissions are not dishonest. They are out of date, and the design changed after the modelling was done.
So build a check into the submission routine. Before anything is uploaded, list every technical assessment against the drawing revision it used, and confirm each one matches the drawings being submitted. It takes twenty minutes and it catches the failure that actually happens.
This is general guidance, not legal advice. Professional conduct requirements are set by the relevant institute, so check your own code and the local planning authority's expectations, or take advice from a qualified professional, before relying on it. You can browse the report types to see which ones carry professional competence requirements. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Is it acceptable for my architect to write the planning statement?
Yes. A planning statement is an advocacy document and officers read it as such, so no conflict arises from the design team writing it. The same is true of a design and access statement. The question only bites on assessment documents that measure the scheme against a published benchmark and report the result.
Which reports raise independence concerns most often?
Daylight and sunlight assessments, viability appraisals and ecological assessments, because each allows judgement in the inputs that can move the outcome. Viability is the clearest case, since national guidance expects the evidence to be transparent and publicly available, and councils commonly commission their own review at the applicant's expense.
Will a council refuse an application because of a conflict?
Rarely on that ground alone. The usual consequences are a request for the underlying data or model, an independent review commissioned by the council and recharged to the applicant, or a line in the officer's report reducing the weight given to the assessment. On a finely balanced decision that reduction in weight can be the deciding factor.
How should a conflict be disclosed?
In the report itself, in a short paragraph naming the author, their qualifications, their role on the project and their relationship to the design team, along with the standard followed. Institutes' codes of conduct already require members to declare conflicts to clients. Concealment, rather than the conflict itself, is what causes real damage.
Is peer review enough instead of an independent author?
Usually, provided the reviewer is free to disagree and the review is submitted whatever it says. Agree that in the appointment. A review that cannot recommend a change has no value, and an officer who suspects that is the arrangement will treat the review as part of the applicant's case rather than as a check on it.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.