Basement Conversion Drawings in St John's Wood (NW8)

Where in NW8 does a basement conversion actually get determined?

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

How does a basement conversion 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 basement conversion can achieve at that address.

• Inside NW8: St John's Wood (NW8) — basement conversion work in St John's Wood means victorian villas, mansion blocks. St John's Wood is Victorian villas, mansion blocks. Victorian cellars here convert without planning permission when the footprint and external appearance throughout NW8. Westminster City Council decides the St John's Wood application, and Lord's Cricket Ground anchors the St John's Wood location plan.
• Bordering NW8: Mayfair (W1J, W1K) — a basement conversion in Mayfair starts from georgian townhouses, listed buildings, and Mayfair reads as Georgian listed townhouses, luxury. Georgian houses here already have a vault and a lower-ground floor in W1J. Westminster City Council assesses Mayfair basement conversions against its own Mayfair character guidance, and the location plan we draw for Mayfair references Berkeley Square.
• Bordering NW8: Belgravia (SW1X, SW1W) — basement conversion work in Belgravia means regency stucco terraces, listed buildings. Belgravia is white stucco Regency terraces. Victorian cellars here convert without planning permission when the footprint and external appearance throughout SW1X. Westminster City Council decides the Belgravia application, and Eaton Square anchors the Belgravia location plan.
• Bordering NW8: Marylebone (W1U, W1G, W1H) — Georgian and Victorian terraces, mansion blocks defines Marylebone, where georgian terraces, edwardian mansion blocks set what a basement conversion can do. Georgian houses here already have a vault and a lower-ground floor across W1U. Any Marylebone basement conversion is validated by Westminster City Council, with Marylebone High Street the usual Marylebone reference point on the site plan.
• Bordering NW8: Pimlico (SW1V) — Regency stucco terraces, grid plan defines Pimlico, where regency terraces, post-war estates set what a basement conversion can do. Post-war slab foundations make basements here expensive and rarely viable across SW1V. Any Pimlico basement conversion is validated by Westminster City Council, with Tate Britain the usual Pimlico reference point on the site plan.
• Bordering NW8: Soho (W1D, W1F) — Georgian fragments, mixed-use defines Soho, where georgian terraces, mixed-use set what a basement conversion can do. Georgian houses here already have a vault and a lower-ground floor across W1D. Any Soho basement conversion is validated by Westminster City Council, with Soho Square the usual Soho reference point on the site plan.
• Bordering NW8: Covent Garden (WC2E, WC2H) — a basement conversion in Covent Garden starts from georgian terraces, conversions, and Covent Garden reads as Georgian piazza, listed buildings. Georgian houses here already have a vault and a lower-ground floor in WC2E. Westminster City Council assesses Covent Garden basement conversions against its own Covent Garden character guidance, and the location plan we draw for Covent Garden references Royal Opera House.
• Bordering NW8: Bayswater (W2) — a basement conversion in Bayswater starts from victorian stucco terraces, and Bayswater reads as Victorian stucco terraces. Victorian cellars here convert without planning permission when the footprint and external appearance in W2. Westminster City Council assesses Bayswater basement conversions against its own Bayswater character guidance, and the location plan we draw for Bayswater references Hyde Park.
• Bordering NW8: Paddington (W2) — a basement conversion in Paddington starts from regency terraces, modern apartments, and Paddington reads as Regency and Victorian terraces, canal-side regen. Modern foundations here are usually raft or piled in W2. Westminster City Council assesses Paddington basement conversions against its own Paddington character guidance, and the location plan we draw for Paddington references Paddington Basin.
• Bordering NW8: Victoria (SW1E, SW1W) — basement conversion work in Victoria means regency terraces, post-war flats. Victoria is Regency terraces, mixed-use. Post-war slab foundations make basements here expensive and rarely viable throughout SW1E. Westminster City Council decides the Victoria application, and Victoria Station anchors the Victoria location plan.

What local planning policy applies to a basement conversion in NW8?

NW8 (St John's Wood) conservation designations: there are 56 across Westminster City Council, St John's Wood, Mayfair, Belgravia among them. Designation costs a NW8 (St John's Wood) owner the permitted-development route: a basement conversion then needs a £258 householder application over 8 weeks, in place of the £120 prior approval route that takes 6 weeks. Pimlico is the NW8 (St John's Wood) designation that most often changes a basement conversion design.

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 basement conversion 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).

NW8 (St John's Wood) 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 basement conversion in NW8 (St John's Wood) 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.

NW8 (St John's Wood) housing stock: 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. Read that before choosing a basement conversion route in NW8 (St John's Wood) — construction, not postcode, sets what is achievable. Basement conversions in NW8 (St John's Wood) start at £1,950 on a fixed fee, or £1,750 for the Complete package covering both Westminster City Council submissions.

NW8 (St John's Wood) conservation designations: there are 40 across Camden Council, Camden Town, Fitzrovia, Hampstead among them. Designation costs a NW8 (St John's Wood) owner the permitted-development route: a basement conversion then needs a £258 householder application over 8 weeks, in place of the £120 prior approval route that takes 6 weeks. Primrose Hill is the NW8 (St John's Wood) designation that most often changes a basement conversion design.

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 basement conversion 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).

NW8 (St John's Wood) below-ground policy: Camden's basement policy (Policy A5) restricts single-storey basements to 50% of garden area; double-storey basements generally refused outside commercial zones. Any basement conversion in NW8 (St John's Wood) that goes below existing foundations triggers two months notice under section 6 of the Party Wall etc. Act 1996, and Camden Council will want the NW8 ground and groundwater position set out.

NW8 (St John's Wood) housing stock: 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. Read that before choosing a basement conversion route in NW8 (St John's Wood) — construction, not postcode, sets what is achievable. Basement conversions in NW8 (St John's Wood) start at £1,950 on a fixed fee, or £1,750 for the Complete package covering both Camden Council submissions.

Who decides a basement conversion on the edge of NW8?

• Wandsworth — the Wandsworth boundary runs against Westminster, so a basement conversion a street from NW8 (St John's Wood) is decided by Wandsworth Council instead. Wandsworth runs 45 conservation areas across SW8 and its neighbours, which is why basement conversions priced for NW8 (St John's Wood) are re-checked against Wandsworth policy whenever the NW8 (St John's Wood) address sits on that edge.
• Lambeth — the Lambeth boundary runs against Westminster, so a basement conversion a street from NW8 (St John's Wood) is decided by Lambeth Council instead. Lambeth runs 64 conservation areas across SE1 and its neighbours, which is why basement conversions priced for NW8 (St John's Wood) are re-checked against Lambeth policy whenever the NW8 (St John's Wood) address sits on that edge.
• City of London — cross the NW8 (St John's Wood) boundary and City of London Corporation takes the basement conversion instead, applying 27 conservation areas of its own around EC1. We re-price basement conversions at the NW8 (St John's Wood) edge because City of London policy and Westminster policy rarely align on basement conversion depth.
• Camden — cross the NW8 (St John's Wood) boundary and Camden Council takes the basement conversion instead, applying 40 conservation areas of its own around NW1. We re-price basement conversions at the NW8 (St John's Wood) edge because Camden policy and Westminster policy rarely align on basement conversion depth.
• Barnet — the Barnet boundary runs against Camden, so a basement conversion a street from NW8 (St John's Wood) is decided by Barnet Council instead. Barnet runs 20 conservation areas across N2 and its neighbours, which is why basement conversions priced for NW8 (St John's Wood) are re-checked against Barnet policy whenever the NW8 (St John's Wood) address sits on that edge.
• Haringey — cross the NW8 (St John's Wood) boundary and Haringey Council takes the basement conversion instead, applying 29 conservation areas of its own around N4. We re-price basement conversions at the NW8 (St John's Wood) edge because Haringey policy and Camden policy rarely align on basement conversion depth.
• Brent — the Brent boundary runs against Camden, so a basement conversion a street from NW8 (St John's Wood) is decided by Brent Council instead. Brent runs 22 conservation areas across NW2 and its neighbours, which is why basement conversions priced for NW8 (St John's Wood) are re-checked against Brent policy whenever the NW8 (St John's Wood) address sits on that edge.

Sources for this NW8 basement conversion 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.