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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

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We use it to check conservation areas and constraints.
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    Architectural model of a four-storey London stucco townhouse in its terrace, with a portico, area railings, sash windows, a cornice and chimney stacks
    The house as it stands: four storeys over a lower ground floor.Existing Proposed worksAn illustrative model, built for this page.

    How we work on planning consultant

    Seven steps from first call to approval.

    The same model cut through the middle: every floor, the stair, the chimney breasts, the new mansard, rear extension and basement in section
    Section through the model: every floor on one datum.
    1. 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.

    2. 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.

    3. 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.

    4. Design frozen

      You choose an option in writing. Nothing changes after this without your say.

    5. 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.

    6. Submission

      We prepare the forms, certificates, fee and documents and submit through the Planning Portal.

    7. 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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    Rear view of brick terraced houses in London with slate roofs and chimney stacks along the shared roofline

    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.

    Pencil resting on a dimensioned technical drawing beside a scale rule

    Local figures for Westminster

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Conservation areas56 named conservation areas published by the council—planning.data.gov.uk
    Article 4 directions10 Article 4 directions published by the council—planning.data.gov.uk
    Listed building entries4,015 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 decisions366 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted82 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time79 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Minor applications granted85.8 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Households living in a house10.2 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk

    A blank value means the figure has not been published, not that there are none. Check your own address with the council.

    Councils bordering Westminster
    Which application your project needsLawful Development Certificate decision: 8 weeks. Prior approval decision: 42 days. Householder decision: 8 weeksYour projectWithin permitted development?Lawful Development CertificatePrior approvalHouseholder applicationYesLarger rear extensionNoABC

    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

    Planning drawing sheet for a rear extension with plans, elevations and sections
    Sample drawing. Planning drawings for a rear extension: plans, elevations and sections on one sheet set.
    Rows of brick terraced houses and gardens on a residential street
    The street around you
    Move across the plinth — the blocks rise around the pointer.

    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

    City of London skyline glowing at dusk across the Thames under a dramatic orange sky

    Tell us about your property.

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