Most homeowners don’t need a planning consultant for a routine rear extension or loft conversion — an architect or architectural technologist experienced in local applications can handle those. But for complex, contentious, or refused applications, a specialist planning consultant can make the difference between a yes and a no.
This guide explains what planning consultants do, when they earn their fee, and what you should expect to pay.
What Is a Planning Consultant?
A planning consultant is a specialist in the UK’s planning system — not to be confused with an architect. While an architect designs buildings, a planning consultant understands how local planning policy, national planning frameworks, and officer decision-making intersect. Many are members of the Royal Town Planning Institute (RTPI) and hold the Chartered Town Planner (MRTPI or FRTPI) designation.
Their work typically includes:
- Advising whether your project needs planning permission or falls within permitted development rights
- Preparing and managing pre-application advice submissions to the local planning authority (LPA)
- Writing planning statements and design-and-access statements to support applications
- Liaising with planning officers during the determination period
- Managing planning appeals to the Planning Inspectorate (written representations, hearings, or public inquiries)
- Advising on conditions attached to grants of permission and how to discharge them
When a Planning Consultant Is Worth Hiring
Complex or Sensitive Sites
If your property sits within a conservation area, is a listed building, falls in a Green Belt, flood zone, or other designated land, the planning process is more involved. Officers must consider heritage and landscape policy as well as standard design guidance. A planning consultant who knows the relevant national and local policies — and who has dealt with your LPA before — significantly improves your chances.
Refused Applications
If your application has been refused, a planning consultant can assess whether the reasons given are sound, whether negotiation with the LPA might resolve them, or whether an appeal is warranted. Planning appeals have a success rate of around 35–40% nationally, but that figure rises substantially when a well-argued case is put by an experienced consultant.
Pre-Application Engagement
Submitting a formal pre-application advice request through your LPA costs £50–£600 depending on the authority and scheme size. A planning consultant can prepare the supporting material that makes this process productive — not just a summary of what you want to build, but a case for why it’s acceptable in planning terms.
Lawful Development Certificates
Obtaining a Certificate of Lawful Development (CLD) — either for existing use or proposed development — requires demonstrating that your project lawfully falls within permitted development. A planning consultant can assemble the legal and factual evidence to make that case robustly.
Larger Residential Schemes
If you’re subdividing a property, building new dwellings, or pursuing a more significant development, a planning consultant becomes near-essential. These applications involve far more policy layers, neighbour impact assessment, and officer negotiation than a standard extension.
Typical Planning Consultant Fees in 2026
Fees vary widely by project type, location, and whether the consultant is a sole practitioner or a larger firm.
| Service | Typical Fee Range |
|---|---|
| Initial planning advice / feasibility review | £500 – £1,500 |
| Pre-application submission (preparation) | £1,200 – £3,000 |
| Householder planning application management | £1,500 – £4,000 |
| Full planning application (larger scheme) | £3,500 – £10,000+ |
| Planning appeal (written representations) | £3,000 – £8,000 |
| Planning appeal (hearing or inquiry) | £8,000 – £25,000+ |
| Lawful development certificate advice | £800 – £2,500 |
London and South East rates are typically 20–40% higher than elsewhere in England. Welsh, Scottish, and Northern Irish planning systems have distinct rules; check that your consultant has relevant devolved-system experience if you’re outside England.
Note that planning consultant fees are separate from LPA application fees (which are set by government and currently range from £258 for a householder application to significantly more for larger schemes).
Planning Consultant vs Architect: Who Does What?
This is a common point of confusion. The roles overlap but are distinct.
An architect designs the building, prepares drawings, and usually handles planning applications for straightforward residential extensions and alterations. For anything more complex, they may bring in a planning consultant to write the planning statement or manage policy-related correspondence.
A planning consultant does not design buildings. They interpret policy, prepare written arguments, and manage the planning process. For any scheme that needs drawings — which most do — you’ll still need an architect or architectural technologist alongside your planning consultant.
For contentious householder applications or appeals, the best approach is usually an architect plus a planning consultant working together.
How to Vet a Planning Consultant
Look for MRTPI or FRTPI membership — this is the main quality marker in the profession. The RTPI’s online member directory lets you search by location and specialism.
Ask specifically about their track record with your LPA. Someone who regularly works in Ealing will know the conservation officer’s preferences and the committee’s tendencies better than a generalist who has never submitted there.
Clarify what’s included in the fee. Some consultants quote for preparation and submission only; others include officer liaison, revision rounds, and post-decision advice. Get scope in writing before engagement.
Beware of guaranteed outcome promises. Planning decisions ultimately rest with the LPA or the Planning Inspectorate. Any consultant who guarantees approval should be treated with caution.
When You Probably Don’t Need One
- A standard rear extension or loft conversion in a non-designated area, handled by an architect experienced with your LPA
- A straightforward outbuilding within permitted development limits where the question is simple and clear
- An application where pre-application advice from the LPA has already confirmed acceptability
In these cases, a competent architect or architectural technologist is sufficient. Save the planning consultant budget for situations where the policy case is genuinely complex, where there’s been a refusal, or where the financial stakes of getting it wrong are high.
The Bottom Line
Planning consultants are a specialist tool. For a routine project, they’re an unnecessary expense. For a difficult site, a refusal, or a significant residential scheme, their fee is often the best money you’ll spend on the project — the cost of a refused appeal or a planning condition that limits what you can do with your property far outweighs a consultant’s retainer.
If you’re unsure whether you need one, a paid one-hour feasibility review (typically £300–£600) with an MRTPI consultant will give you an honest answer.
