Westminster, London
Planning consultant in Westminster
A planning consultant in Westminster earns the fee when your flat or house sits among 56 conservation areas and 4,015 listed entries, under a council that reads every roof and mews alteration closely. We give a fixed quote after a free constraints check, and our MCIAT chartered architectural technologists draw the sheets that go with the advice.
Fixed quote after a free constraints check
- MCIAT chartered
- £2m PI insured
- LABC Partnered
- Fixed fees, VAT included
Request a fixed quote

How we work on planning consultant
Seven steps from first call to approval.

Enquiry and constraints check
We check the property against conservation areas, listed status, Article 4 directions, tree preservation orders, flood zone and planning history. We choose the right route and send a fixed quote.
Measured survey
We survey the house on one datum: rooms, levels, boundaries, drains, trees and the neighbours' windows that the 45° and 25° tests depend on.
Design options
We model the house in Revit and show you options in 3D and plan, with the planning strategy and the precedents in your street.
Design frozen
You choose an option in writing. Nothing changes after this without your say.
Independent check
A second chartered technologist checks every sheet against the council's validation checklist and the policy. A senior review signs it off before anything is submitted.
Submission
We prepare the forms, certificates, fee and documents and submit through the Planning Portal.
Officer liaison
We answer the planning officer and make any amendments within five working days, at no charge until approval.
Free redraws until approval. Every drawing set is checked independently, and the checker is never the person who drew it.
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What Westminster's City Plan asks of a householder scheme
The development plan is the City Plan 2019-2040 (2026), recent enough that most older advice online no longer matches it. Two of its policies reach small residential jobs more often than people expect. The first is the flood policy: the council requires a site-specific flood risk assessment for large sites, for all development in the higher flood zones and inside a Surface Water Flood Management Zone (the policy trigger in short: 1 ha; FZ2/3; surface water zone). A basement or lower-ground conversion in the wrong zone can trigger it even on a single house.
The second is the refurbishment policy. For residential conversions and extensions the council sets an aim of BREEAM Excellent in domestic refurbishment once a scheme passes the size threshold in the policy (500 sq m / 5 dwellings: BREEAM Excellent aim). Most householder work falls far below that, but a whole-building conversion of a large villa can cross it, and the first warning often comes from the validation officer.
Two supplementary documents sit alongside the plan and officers cite them constantly in this borough: the Roofs: a guide to alterations and extensions on domestic buildings SPG and the Mews: a guide to alterations SPG. If your project touches a roofline or a mews building, a consultant reads those first, because the design argument in your statement has to answer them directly.

Local figures for Westminster
| Measure | Value | Period | Source |
|---|---|---|---|
| Conservation areas | 56 named conservation areas published by the council | — | planning.data.gov.uk |
| Article 4 directions | 10 Article 4 directions published by the council | — | planning.data.gov.uk |
| Listed building entries | 4,015 list entries (Historic England, within the LPA boundary) | — | planning.data.gov.uk |
| Policy 39B: a site-specific Flood Risk Assessment is required for developments of 1 ha or greater, all development in Flood Zones 2 and 3, and all development within a Surface Water Flood Management Zone. | 1 ha; FZ2/3; surface water zone | — | westminster.gov.uk, Westminster City Plan 2019-2040 (as revised, adopted 21 January 2026), Policy 39B, p.160 |
| Policy 42E: residential conversions and extensions of 500 sq m GIA or more, or five or more dwellings, aim to achieve BREEAM Excellent in domestic refurbishment or equivalent. | 500 sq m / 5 dwellings: BREEAM Excellent aim | — | westminster.gov.uk, Westminster City Plan 2019-2040 (as revised, adopted 21 January 2026), Policy 42 clause E.2, p.172 |
| Householder decisions | 366 decisions | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications granted | 82 % | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications decided in time | 79 % decided within 8 weeks or an agreed extended period | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Minor applications granted | 85.8 % | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Households living in a house | 10.2 % of households living in a house or bungalow (detached, semi-detached or terraced) | Census 2021 | nomisweb.co.uk |
A blank value means the figure has not been published, not that there are none. Check your own address with the council.
Which application your project needs
The usual route for a house; flats and listed buildings follow other rules.
- A · Lawful Development Certificate decision
- 8 weeks
- B · Prior approval decision
- 42 days
- C · Householder decision
- 8 weeks
Why Westminster needs more than a drawing set
Only 10.2 per cent of households here live in a house or bungalow, and 27.4 per cent own their home. Most enquiries therefore come from leaseholders in converted buildings, where the real questions are freehold consent, shared roofs and the effect on neighbours, with permitted development a distant second.
The heritage layer adds weight. The borough holds 205 Grade I and 373 Grade II* entries within its 4,015 listed entries, 1 World Heritage Site, and 10 Article 4 directions that remove permitted development rights in defined areas. A consultant maps your address against all of these before anyone sketches a layout.
That map shapes the first conversation: it should be about the route, and about whether a Lawful Development Certificate in Westminster is even available to you.
How Westminster decides, in its own figures
In the latest twelve months we hold, the council made 366 householder decisions and granted 82 per cent of them, with 79 per cent decided inside eight weeks or an agreed extension. For minor applications the totals are 1,766 decisions, 85.8 per cent granted and 83.6 per cent in time.
Read those as context. A grant rate across hundreds of cases says little about a listed building with a contested rear addition. It does show that well-documented schemes are the norm here, and that the timetable usually holds when the application is valid on day one.
Validity is where a consultant earns the fee. The national householder fee is £548, and a council can only insist on local validation items from a list adopted within the last 2 years. We check the list's date against the council's request before you pay anything.
Planning advice for a basement, mews or roof job here
Three kinds of job bring most people to us. A lower-ground extension needs the flood test above and often a basement impact assessment in Westminster. A mews house needs a design case built on the mews guidance. A roof alteration needs the roofs guidance and, if neighbours' light is affected, a daylight and sunlight report in Westminster.
For each, we write a short planning statement that sets the scheme against the policies named above, agree the application route with you, and prepare the drawings so the text and the sheets describe the same building. An independent chartered technologist, never the person who drew the set, checks the package before it goes in, and we redraw free until approval.
If the council has already said no, our planning appeals service in Westminster starts from the decision notice. A householder appeal has a deadline of 12 weeks, so send the notice as soon as you have it.
Working with us on a Westminster brief
Expect a short written note within the first conversation: the application route we would choose, the two or three policies most likely to shape the officer's view, and the documents the council will want on day one. If the answer is that you only need drawings, we say so, and the free check costs you nothing. If a larger conversion is in play, we flag early whether the refurbishment aim or the flood test could apply, so those costs are known before the design is fixed.
Send the address and a line on what you want to build. We check it against conservation areas, listing, Article 4, trees and the council's history for the street, then tell you in plain English whether you need a consultant or only drawings. The wider picture for the borough is on our architectural drawings page for Westminster, and the general service is described under planning consultant.
What you receive


Related pages
Other services in Westminster
Questions
Does a flat conversion in Westminster need a flood risk assessment?
Only if it meets the council's trigger, which covers larger sites, anything in the higher flood zones and the surface water management zone. The free constraints check tells you which applies at your address.
How long does Westminster take to decide a householder application?
The statutory period for a non-major application is 8 weeks. The council decided 79 per cent of householder cases in time, but we cannot promise a date for yours.
Do I need a consultant for a mews house alteration?
Often yes. The council's mews guidance shapes what is acceptable, and a short planning statement answering it makes the officer's job easier.
What does the service cost?
We give a fixed quote after a free constraints check. The council's own householder fee of £548 is paid to the council separately.
Sources and dates
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- westminster.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- nomisweb.co.uk, retrieved
- westminster.gov.uk, retrieved
- westminster.gov.uk, retrieved
- nomisweb.co.uk, retrieved
- planning.data.gov.uk, retrieved
- ribblevalley.gov.uk, retrieved
- gov.uk, retrieved
- legislation.gov.uk, retrieved
- legislation.gov.uk, retrieved
- legislation.gov.uk, retrieved
- legislation.gov.uk, retrieved
- Contains public sector information licensed under the Open Government Licence v3.0.
- Contains OS data © Crown copyright and database right 2026.
- Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
- Contains Historic England data © Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.

Tell us about your property.
We check the constraints, then send a fixed fee. Messages before 3pm get a reply the same working day.