Single-storey rear cost in Westminster

Which Westminster postcodes does this house extension cost single service cover?

Every Westminster postcode district we draw in, the stock that dominates it and the authority that validates a house extension cost single there. Westminster fees below are the statutory England rates for 2026, not house extension cost single estimates.

What changes about a house extension cost single in each part of Westminster?

Roof pitch, wall build-up and plot depth change every few Westminster streets, and each one changes what a house extension cost single can achieve at that address.

• St John's Wood (NW8) — Victorian villas, mansion blocks defines St John's Wood, where victorian villas, mansion blocks set what a house extension cost single can do. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage across NW8. Any St John's Wood house extension cost single is validated by Westminster City Council, with Lord's Cricket Ground the usual St John's Wood reference point on the site plan.
• Bayswater (W2) — Victorian stucco terraces defines Bayswater, where victorian stucco terraces set what a house extension cost single can do. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage across W2. Any Bayswater house extension cost single is validated by Westminster City Council, with Hyde Park the usual Bayswater reference point on the site plan.
• Paddington (W2) — Regency and Victorian terraces, canal-side regen defines Paddington, where regency terraces, modern apartments set what a house extension cost single can do. Modern housing here is frequently covered by a planning condition removing permitted development rights across W2. Any Paddington house extension cost single is validated by Westminster City Council, with Paddington Basin the usual Paddington reference point on the site plan.
• Victoria (SW1E, SW1W) — Regency terraces, mixed-use defines Victoria, where regency terraces, post-war flats set what a house extension cost single can do. Post-war houses on these estates often sit under an estate management scheme across SW1E. Any Victoria house extension cost single is validated by Westminster City Council, with Victoria Station the usual Victoria reference point on the site plan.
• Westbourne Green (W2, W9) — house extension cost single work in Westbourne Green means victorian terraces, mansion blocks. Westbourne Green is Victorian terraces and mansion blocks. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage throughout W2. Westminster City Council decides the Westbourne Green application, and Royal Oak anchors the Westbourne Green location plan.
• Maida Vale (W9) — a house extension cost single in Maida Vale starts from edwardian mansion blocks, victorian villas, and Maida Vale reads as Edwardian mansion blocks, canal-side. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage in W9. Westminster City Council assesses Maida Vale house extension cost singles against its own Maida Vale character guidance, and the location plan we draw for Maida Vale references Little Venice.
• Mayfair (W1J, W1K) — house extension cost single work in Mayfair means georgian townhouses, listed buildings. Mayfair is Georgian listed townhouses, luxury. Georgian rear elevations here are usually the listed or locally listed face of the building throughout W1J. Westminster City Council decides the Mayfair application, and Berkeley Square anchors the Mayfair location plan.

Does Westminster planning policy restrict a house extension cost single?

How designation changes a Westminster house extension cost single: Westminster City Council maintains 56 conservation areas, including Belgravia, Marylebone, Pimlico. Inside any of them a Westminster house extension cost single cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Covent Garden sets the tone for Westminster casework.

Westminster and Article 4: Multiple Article 4 Directions — office-to-residential restrictions, HMO conversions, retail to residential in shopping zones. A house extension cost single planned at a NW8 address is checked against that direction first; Westminster City Council publishes the Westminster extent, and the NW8 line rarely follows the Westminster boundary you would expect.

Westminster 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 house extension cost single in Westminster 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 NW8 ground and groundwater position set out.

What Westminster is built from: 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. That mix decides the house extension cost single route in Westminster more than the postcode does.

Which neighbouring authorities border Westminster?

• Wandsworth — adjoining Westminster, with 45 conservation areas centred on SW8. A house extension cost single on the far side of the Westminster line is determined by Wandsworth Council, so the Westminster quote for house extension cost singles is checked against Wandsworth guidance before it is issued.
• Lambeth — the Lambeth boundary runs against Westminster, so a house extension cost single a street from Westminster is decided by Lambeth Council instead. Lambeth runs 64 conservation areas across SE1 and its neighbours, which is why house extension cost singles priced for Westminster are re-checked against Lambeth policy whenever the Westminster address sits on that edge.
• City of London — adjoining Westminster, with 27 conservation areas centred on EC1. A house extension cost single on the far side of the Westminster line is determined by City of London Corporation, so the Westminster quote for house extension cost singles is checked against City of London guidance before it is issued.
• Camden — adjoining Westminster, with 40 conservation areas centred on NW1. A house extension cost single on the far side of the Westminster line is determined by Camden Council, so the Westminster quote for house extension cost singles is checked against Camden guidance before it is issued.

Sources for this Westminster house extension cost single 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.