House Extension Drawings in St John's Wood (NW8)

Which postcode districts around NW8 do we cover for house extension work?

Every NW8 postcode district we draw in, the stock that dominates it and the authority that validates a house extension there. NW8 fees below are the statutory England rates for 2026, not house extension estimates.

How does a house extension differ street by street across NW8?

Roof pitch, wall build-up and plot depth change every few NW8 streets, and each one changes what a house extension can achieve at that address.

• Inside NW8: St John's Wood (NW8) — Victorian villas, mansion blocks defines St John's Wood, where victorian villas, mansion blocks set what a house extension 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 is validated by Westminster City Council, with Lord's Cricket Ground the usual St John's Wood reference point on the site plan.
• Bordering NW8: Mayfair (W1J, W1K) — Georgian listed townhouses, luxury defines Mayfair, where georgian townhouses, listed buildings set what a house extension can do. Georgian rear elevations here are usually the listed or locally listed face of the building across W1J. Any Mayfair house extension is validated by Westminster City Council, with Berkeley Square the usual Mayfair reference point on the site plan.
• Bordering NW8: Belgravia (SW1X, SW1W) — white stucco Regency terraces defines Belgravia, where regency stucco terraces, listed buildings set what a house extension 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 SW1X. Any Belgravia house extension is validated by Westminster City Council, with Eaton Square the usual Belgravia reference point on the site plan.
• Bordering NW8: Marylebone (W1U, W1G, W1H) — a house extension in Marylebone starts from georgian terraces, edwardian mansion blocks, and Marylebone reads as Georgian and Victorian terraces, mansion blocks. Georgian rear elevations here are usually the listed or locally listed face of the building in W1U. Westminster City Council assesses Marylebone house extensions against its own Marylebone character guidance, and the location plan we draw for Marylebone references Marylebone High Street.
• Bordering NW8: Pimlico (SW1V) — a house extension in Pimlico starts from regency terraces, post-war estates, and Pimlico reads as Regency stucco terraces, grid plan. Post-war houses on these estates often sit under an estate management scheme in SW1V. Westminster City Council assesses Pimlico house extensions against its own Pimlico character guidance, and the location plan we draw for Pimlico references Tate Britain.
• Bordering NW8: Soho (W1D, W1F) — house extension work in Soho means georgian terraces, mixed-use. Soho is Georgian fragments, mixed-use. Georgian rear elevations here are usually the listed or locally listed face of the building throughout W1D. Westminster City Council decides the Soho application, and Soho Square anchors the Soho location plan.
• Bordering NW8: Covent Garden (WC2E, WC2H) — a house extension in Covent Garden starts from georgian terraces, conversions, and Covent Garden reads as Georgian piazza, listed buildings. Georgian rear elevations here are usually the listed or locally listed face of the building in WC2E. Westminster City Council assesses Covent Garden house extensions against its own Covent Garden character guidance, and the location plan we draw for Covent Garden references Royal Opera House.
• Bordering NW8: Bayswater (W2) — house extension work in Bayswater means victorian stucco terraces. Bayswater is Victorian stucco terraces. 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 Bayswater application, and Hyde Park anchors the Bayswater location plan.
• Bordering NW8: Paddington (W2) — house extension work in Paddington means regency terraces, modern apartments. Paddington is Regency and Victorian terraces, canal-side regen. Modern housing here is frequently covered by a planning condition removing permitted development rights throughout W2. Westminster City Council decides the Paddington application, and Paddington Basin anchors the Paddington location plan.
• Bordering NW8: Victoria (SW1E, SW1W) — a house extension in Victoria starts from regency terraces, post-war flats, and Victoria reads as Regency terraces, mixed-use. Post-war houses on these estates often sit under an estate management scheme in SW1E. Westminster City Council assesses Victoria house extensions against its own Victoria character guidance, and the location plan we draw for Victoria references Victoria Station.

Does NW8 planning policy restrict a house extension?

Conservation areas covering NW8 (St John's Wood): Westminster City Council runs 56, and Mayfair, Belgravia, Marylebone are the ones NW8 (St John's Wood) owners meet most. A house extension inside a NW8 (St John's Wood) conservation area loses permitted development, so the NW8 (St John's Wood) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Covent Garden a house extension is judged on the street elevation first.

What Article 4 removes near NW8 (St John's Wood): Multiple Article 4 Directions — office-to-residential restrictions, HMO conversions, retail to residential in shopping zones. Before pricing a house extension we check whether the NW8 address is inside the mapped area, because Westminster City Council draws the NW8 (St John's Wood) boundary street by street rather than across the whole of NW8 (St John's Wood).

Digging below a NW8 (St John's Wood) property: Westminster basement policy restricts to single-storey, typically under 50% of rear garden footprint; lightwells and rooflights strictly controlled in conservation areas. Where a house extension in NW8 (St John's Wood) involves excavation that is read beside the Party Wall etc. Act 1996, which needs two months notice for a NW8 (St John's Wood) dig within 3 m of a neighbour, and Westminster City Council expects the NW8 ground conditions addressed in the application.

What NW8 (St John's Wood) 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 route in NW8 (St John's Wood) more than the postcode does, and it is what a Westminster City Council case officer reads first. A householder application costs £548 paid to Westminster City Council direct, with 8 weeks to a decision once validated.

Conservation areas covering NW8 (St John's Wood): Camden Council runs 40, and Primrose Hill, Bloomsbury, Camden Town are the ones NW8 (St John's Wood) owners meet most. A house extension inside a NW8 (St John's Wood) conservation area loses permitted development, so the NW8 (St John's Wood) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Fitzrovia a house extension is judged on the street elevation first.

What Article 4 removes near NW8 (St John's Wood): Article 4 removes permitted development for HMO conversions (C3 to C4) across the borough, plus restrictions on basement extensions in 12 conservation areas. Before pricing a house extension we check whether the NW8 address is inside the mapped area, because Camden Council draws the NW8 (St John's Wood) boundary street by street rather than across the whole of NW8 (St John's Wood).

Digging below a NW8 (St John's Wood) property: Camden's basement policy (Policy A5) restricts single-storey basements to 50% of garden area; double-storey basements generally refused outside commercial zones. Where a house extension in NW8 (St John's Wood) involves excavation that is read beside the Party Wall etc. Act 1996, which needs two months notice for a NW8 (St John's Wood) dig within 3 m of a neighbour, and Camden Council expects the NW8 ground conditions addressed in the application.

What NW8 (St John's Wood) is built from: Victorian and Edwardian terraces, Georgian townhouses in Bloomsbury and Hampstead, post-war mansion blocks, modern developments in King's Cross. Creative, affluent in Hampstead and Primrose Hill; dense mixed-use around Camden Town and Kings Cross; academic character in Bloomsbury. That mix decides the house extension route in NW8 (St John's Wood) more than the postcode does, and it is what a Camden Council case officer reads first. A householder application costs £548 paid to Camden Council direct, with 8 weeks to a decision once validated.

Who decides a house extension on the edge of NW8?

• Lambeth — adjoining NW8 (St John's Wood), with 64 conservation areas centred on SE1. A house extension on the far side of the NW8 (St John's Wood) line is determined by Lambeth Council, so the NW8 (St John's Wood) quote for house extensions is checked against Lambeth guidance before it is issued.
• City of London — the City of London boundary runs against Westminster, so a house extension a street from NW8 (St John's Wood) is decided by City of London Corporation instead. City of London runs 27 conservation areas across EC1 and its neighbours, which is why house extensions priced for NW8 (St John's Wood) are re-checked against City of London policy whenever the NW8 (St John's Wood) address sits on that edge.
• Camden — adjoining NW8 (St John's Wood), with 40 conservation areas centred on NW1. A house extension on the far side of the NW8 (St John's Wood) line is determined by Camden Council, so the NW8 (St John's Wood) quote for house extensions is checked against Camden guidance before it is issued.
• Kensington and Chelsea — the Kensington and Chelsea boundary runs against Westminster, so a house extension a street from NW8 (St John's Wood) is decided by RBKC Planning instead. Kensington and Chelsea runs 38 conservation areas across SW1 and its neighbours, which is why house extensions priced for NW8 (St John's Wood) are re-checked against Kensington and Chelsea policy whenever the NW8 (St John's Wood) address sits on that edge.
• Westminster — the Westminster boundary runs against Camden, so a house extension a street from NW8 (St John's Wood) is decided by Westminster City Council instead. Westminster runs 56 conservation areas across SW1 and its neighbours, which is why house extensions priced for NW8 (St John's Wood) are re-checked against Westminster policy whenever the NW8 (St John's Wood) address sits on that edge.
• Islington — cross the NW8 (St John's Wood) boundary and Islington Council takes the house extension instead, applying 40 conservation areas of its own around N1. We re-price house extensions at the NW8 (St John's Wood) edge because Islington policy and Camden policy rarely align on house extension depth.
• Barnet — adjoining NW8 (St John's Wood), with 20 conservation areas centred on N2. A house extension on the far side of the NW8 (St John's Wood) line is determined by Barnet Council, so the NW8 (St John's Wood) quote for house extensions is checked against Barnet guidance before it is issued.
• Haringey — the Haringey boundary runs against Camden, so a house extension a street from NW8 (St John's Wood) is decided by Haringey Council instead. Haringey runs 29 conservation areas across N4 and its neighbours, which is why house extensions priced for NW8 (St John's Wood) are re-checked against Haringey policy whenever the NW8 (St John's Wood) address sits on that edge.

Sources for this NW8 house extension 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.