Soho — covered by Westminster City Council.
Planning permission drawings delivered by an MCIAT chartered team.
Building regulations drawings delivered by an MCIAT chartered team.
Loft conversion drawings delivered by an MCIAT chartered team.
House extension drawings delivered by an MCIAT chartered team.
Mansard roof extensions delivered by an MCIAT chartered team.
Garage conversion drawings delivered by an MCIAT chartered team.
Basement conversion drawings delivered by an MCIAT chartered team.
Structural calculations delivered by an MCIAT chartered team.
Measured building survey delivered by an MCIAT chartered team.
Party wall services delivered by an MCIAT chartered team.
Rear dormer drawings delivered by an MCIAT chartered team.


W1F primarily covers Soho in Westminster.
Decisions for W1F are made by Westminster City Council. Standard Permitted Development rules apply for most rear extensions and loft conversions on terraced and semi-detached houses, unless the property is in a conservation area, is listed, or sits under an Article 4 Direction. Article 4 in Westminster: Yes.
Building regs from £950. We do not charge hourly. Free site survey across all W1F addresses.
From first call to planning decision: typically 12–14 weeks. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination. Westminster City Council timelines align with the national norm.
Soho in W1F is characterised by the housing stock of Westminster — broadly grand georgian and regency terraces in belgravia and pimlico.

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Every W1F postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. W1F fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| W1F | Soho | Georgian terraces, mixed-use | A drawing package at an W1F address in Soho is determined by Westminster City Council under its own Local Plan policies for Soho. |
| NW8 | St John's Wood | Victorian villas, mansion blocks | Adjoining district to W1F, also inside Westminster for drawing package purposes. |
| SW1A | Whitehall / Buckingham Palace | mixed stock | Adjoining district to W1F, also inside Westminster for drawing package purposes. |
| SW1E | Victoria | Regency terraces, post-war flats | Adjoining district to W1F, also inside Westminster for drawing package purposes. |
| SW1H | St James's Park | mixed stock | Adjoining district to W1F, also inside Westminster for drawing package purposes. |
Roof pitch, wall build-up and plot depth change every few W1F streets, and each one changes what a drawing package can achieve at that address.
W1F (Soho) conservation designations: there are 56 across Westminster City Council, Belgravia, Marylebone, Pimlico among them. Designation costs a W1F (Soho) owner the permitted-development route: a drawing package then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. St John's Wood is the W1F (Soho) designation that most often changes a drawing package design.
W1F (Soho) and Article 4: Multiple Article 4 Directions — office-to-residential restrictions, HMO conversions, retail to residential in shopping zones. A drawing package planned at a W1F address is checked against that direction first; Westminster City Council publishes the W1F (Soho) extent, and the W1F line rarely follows the W1F (Soho) boundary you would expect.
W1F (Soho) below-ground policy: Westminster basement policy restricts to single-storey, typically under 50% of rear garden footprint; lightwells and rooflights strictly controlled in conservation areas. Any drawing package in W1F (Soho) that goes below existing foundations triggers two months notice under section 6 of the Party Wall etc. Act 1996, and Westminster City Council will want the W1F ground and groundwater position set out.
The building fabric around W1F (Soho): Grand Georgian and Regency terraces in Belgravia and Pimlico; Victorian and Edwardian mansion blocks; heritage-rich townhouses throughout; very high listed building density. Heritage-first planning approach; listed buildings on almost every street; basement and rear extension policies particularly strict. A drawing package in W1F (Soho) is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Westminster City Council.
Sources for this W1F drawing package page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
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