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House Extension Drawings · Marylebone · Westminster

House Extension Drawings in Marylebone |

Chartered extension plans for the W1U, W1G, W1H area. No hourly billing, and around 30% below typical London architect rates. Marylebone falls under Westminster City Council, so the Westminster Local Plan governs what gets consent.

What is house extension drawings in Marylebone?

House Extension Drawings for a property in Marylebone are survey-based Marylebone drawings for a rear, side or wrap-around extension in W1U, W1G, W1H. they fix the Marylebone depth against permitted-development limits, answer the 45-degree amenity test Westminster City Council applies, and locate the party wall on the georgian terraces, and Westminster City Council weighs the scheme against the Westminster Local Plan.

House Extension Drawings in Marylebone — the local dataset

Marylebone postcode districts
W1U, W1G, W1H — Marylebone
Local planning authority
Westminster City Council (City of Westminster)
Dominant Marylebone stock
Georgian terraces, Edwardian mansion blocks
Statutory householder fee
£548, decided in 8 weeks
Landmarks near the W1U sites we survey
Marylebone High Street, Wigmore Hall
Article 4 Direction
In force across Westminster
Marylebone character
Georgian and Victorian terraces, mansion blocks
Conservation areas in Westminster
56, including Belgravia Conservation Area
Adjoining borough
City of London — nearest peer area Roehampton
First-time approval rate
98% across our London caseload
Marylebone page reviewed
August 2026

Victorian terraced street in London — house extensions
Westminster City Council context

Do I need house extension drawings in Marylebone?

An Article 4 Direction applies across Westminster, so check it before assuming Marylebone permitted development survives. You cannot design for Marylebone without accounting for the fact that it is Georgian and Victorian terraces, mansion blocks. Westminster has 56 conservation areas, and Belgravia is the one that most often covers Marylebone stock. We plot the Marylebone site against the designation before quoting.

Article 4 directions are checked street by street in Marylebone; the borough-wide answer is rarely the whole answer. A W1U survey answers most of it — where the georgian terraces allows the rear wall to go. The borough policy layer over every W1U, W1G, W1H address is set out on Westminster planning. The Marylebone survey then carries into architectural drawings in Marylebone if the project runs on to construction.

Marylebone georgian terraces: proposed rear extension plan and section for georgian terraces prepared for Westminster City
Marylebone georgian terraces: proposed rear extension plan and section for a georgian terraces prepared for Westminster City Council
Timeline

How long does Westminster City Council take to decide?

Validation alone costs City of Westminster one to two weeks even when the Marylebone pack is complete, and that queue — not the determination — is where most W1U, W1G, W1H delay starts. Step one at a W1U, W1G, W1H address is a full measured survey of the existing building.

Statutory periods: 8 weeks from validation for a householder application, 13 weeks for a major scheme, 6 weeks for prior approval with a 21 days neighbour consultation, and 5 weeks for a full plans building control submission. A party structure notice requires one month notice and two months where excavation is involved.

City of Westminster publishes the Marylebone application online during consultation. The set is checked against the City of Westminster validation list before it goes in.

The Marylebone consultation period is where a weak scheme is exposed. Drainage runs and manhole positions on the W1U plot are picked up on the day.

Party wall procedure runs alongside the Marylebone application, not after it. Once consent is granted, planning permission follows for the W1U property.

Local building fabric

What Marylebone's housing stock means for your plans

Marylebone is characterised by georgian terraces, edwardian mansion blocks, concentrated across W1U, W1G, W1H in the Marylebone area. Marylebone is not uniform, but the georgian terraces recurs often enough across W1U, W1G, W1H that the structural pattern is predictable once measured. For a typical Marylebone house, georgian rear elevations here are usually the listed or locally listed face of the building, so a glazed link and a lightweight rear addition tend to fare better than a full-width box. That detail drives the W1U construction sequence. The blocks around Marylebone High Street set the prevailing eaves and ridge lines, and Westminster City Council officers reference that rhythm when assessing height and massing on a Marylebone street.

Digging down in Marylebone runs into policy: Westminster basement policy restricts to single-storey, typically under 50% of rear garden footprint; lightwells and rooflights strictly controlled in conservation areas. Where the project also touches building regulations drawings for W1U properties or loft conversion drawings, the same measured survey of the Marylebone property carries across — you pay for the survey once, not per application.

What the Marylebone drawing pack contains

For a W1U, W1G, W1H address the deliverables are fixed, not open-ended.

  • existing and proposed ground-floor plans for the Marylebone property
  • proposed rear elevation
  • long section through the extension
  • site and block plans
  • party wall position drawing

Streets and landmarks we survey around Marylebone

  • Cavendish Square — roof profiles that set the ridge datum Westminster City Council measures a Cavendish Square dormer against.
  • Marylebone High Street — front-to-back level changes that drive the Marylebone High Street section drawings.
  • Portland Place — gardens deep enough for the 8 weeks householder route on a Portland Place plot.
  • Wigmore Street — side returns where the 45-degree amenity test decides how far a Wigmore Street extension goes.
  • Oxford Street — terraced rear elevations — the Oxford Street party wall position is drawn first.
  • Lisson Grove — side returns where the 45-degree amenity test decides how far a Lisson Grove extension goes.
  • Marylebone Lane — frontages visible from the highway, so Belgravia materials detail governs the Marylebone Lane elevation.
  • Regent's Park — gardens deep enough for the 8 weeks householder route on a Regent's Park plot.
  • Marylebone High Street — Westminster City Council weighs W1U sightlines to it in the character assessment.
  • Wigmore Hall — schemes visible from it get closer scrutiny in Westminster.
  • Sylvia Young Theatre School — schemes in view of it attract closer officer scrutiny.
  • St Marylebone Parish Church — schemes in view of it attract closer officer scrutiny.
  • St Marylebone Church — schemes visible from it get closer scrutiny in Westminster.
  • London Business School — proposals in its setting are drawn with the Marylebone context elevation.

Getting to a Marylebone survey

Surveyors travel to W1U addresses from the studio; the nearest stations are Marylebone station, Baker Street, Bond Street, Edgware Road. Appointments are booked in Marylebone on weekdays and Saturdays, and the measured survey of a standard georgian terraces takes two to three hours.

Where Marylebone sits

Marylebone lies 2 miles (3.2 km) north-west of Charing Cross, on Ordnance Survey grid reference TQ285815. A W1U submission is checked against exactly that location before Westminster City Council will register it. Source.

Practical detail for a Marylebone submission: Marylebone is served by Marylebone station and Baker Street and Bond Street and Edgware Road; the postal town here is LONDON; dialling code 020; listed fabric nearby includes Grade II Paul McCartney. Site plans are drawn to the address as Westminster City Council holds it.

Marylebone postcode coverage

The districts we work in here: W1U (Marylebone), which Marylebone holds on its own; W1G (Harley Street / Marylebone), which Marylebone holds on its own; W1H (Marylebone), which Marylebone holds on its own. Which side of the W1U line a property sits on changes the Westminster constraints that apply.

Streets and stations in Marylebone

Streets we survey in Marylebone include Cavendish Square, Marylebone High Street, Portland Place, Wigmore Street, Oxford Street, Lisson Grove, Marylebone Lane and Regent's Park. most Marylebone sites are within walking distance of Marylebone station or Baker Street or Bond Street. and Grade II Paul McCartney is listed, which pulls neighbouring W1U proposals into a setting assessment.

Areas we cover around Marylebone

We take instructions from Roehampton (SW15), Clapham (SW4), Brixton (SW2, SW9), Herne Hill (SE24), Kennington (SE11), Streatham (SW16) and everywhere between them and Marylebone.

House Extension Drawings in Marylebone — a flat-roof rear extension with rooflights
A flat-roof rear extension with rooflights — house extension drawings in Marylebone.
Westminster costs

How much do house extension drawings cost in Marylebone?

Price differences between Marylebone projects come from the fabric — the georgian terraces, level changes, and any Belgravia heritage requirement.

Statutory application fees are set by regulation, not by the council: £548 householder, £610 for a new dwelling, £274 for a lawful development certificate, £249 for prior approval.

The statutory charge on a Marylebone application goes to City of Westminster at submission. London planning approval-rate dataset · Westminster planning · house extension drawings across London · house extension drawings in Roehampton.

Your W1U technologist

MCIAT chartered technologists working across Westminster

Drawings for Marylebone are issued under MCIAT charter, which is the technical design and construction-detailing qualification rather than an RIBA registration. If your Marylebone site is tight — Wigmore Hall in the setting, a Belgravia designation, a shared flank wall — we test it with Westminster City Council first rather than submit and hope.

Drawings are produced by chartered members of the Chartered Institute of Architectural Technologists (MCIAT), the professional body for technical design and building-regulations competence. First-time approval across our London caseload is 98%. Statutory fees shown are those in force in England in 2026 under the Town and Country Planning (Fees for Applications) Regulations. Confirm your local authority at gov.uk and submission requirements on the Planning Portal. Studio: 71–75 Shelton Street, London WC2H 9JQ.

A short call about the Marylebone property is usually enough to scope the job. This Marylebone page was reviewed in August 2026.

Marylebone questions

House Extension Drawings in Marylebone — common questions

Does a Marylebone house need house extension drawings?

Sometimes. The test for a Marylebone property is house versus flat, listed versus not, and inside Belgravia versus outside. An Article 4 Direction applies across Westminster, so check it before assuming Marylebone permitted development survives. We establish which applies at the W1U survey rather than guessing from the street.

Does conservation status apply to my W1U address?

Belgravia is the designation to check first — one of 56 in Westminster. Within its boundary a Marylebone proposal is judged against the area appraisal, and materials and window detail start to matter as much as size.

What housing stock do you handle in Marylebone?

The Marylebone stock is georgian terraces, edwardian mansion blocks. Whatever the planning route, the georgian terraces decides the structural work, which is why the W1U survey comes before the design.

Where else in Westminster do you work?

We survey anywhere in Westminster and City of London, Marylebone and Roehampton included.

House Extension Drawings in Marylebone — a two-storey extension with a balcony
A two-storey extension with a balcony — house extension drawings in Marylebone.
Other packages in Marylebone

Related drawings for W1U, W1G, W1H properties

House Extension Drawings near Marylebone

house extensions · Westminster planning · house extension drawings across London

House Extension Drawings in Marylebone

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