Basement Conversion Drawings in Southwark

Which Southwark postcodes does this basement conversion service cover?

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

How does a basement conversion differ street by street across Southwark?

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

• Camberwell (SE5) — a basement conversion in Camberwell starts from georgian villas, victorian terraces, and Camberwell reads as Georgian villas, Victorian terraces. Georgian houses here already have a vault and a lower-ground floor in SE5. Southwark Council assesses Camberwell basement conversions against its own Camberwell character guidance, and the location plan we draw for Camberwell references Camberwell Green.
• Peckham (SE15) — a basement conversion in Peckham starts from victorian terraces, post-war estates, and Peckham reads as Victorian terraces, creative renewal. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged in SE15. Southwark Council assesses Peckham basement conversions against its own Peckham character guidance, and the location plan we draw for Peckham references Peckham Rye.
• Dulwich Village (SE21) — basement conversion work in Dulwich Village means georgian villas, edwardian villas (dulwich estate). Dulwich Village is Georgian and Edwardian villas, Estate-managed. Georgian houses here already have a vault and a lower-ground floor throughout SE21. Southwark Council decides the Dulwich Village application, and Dulwich Picture Gallery anchors the Dulwich Village location plan.
• East Dulwich (SE22) — Victorian and Edwardian terraces defines East Dulwich, where victorian and edwardian terraces set what a basement conversion can do. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged across SE22. Any East Dulwich basement conversion is validated by Southwark Council, with Lordship Lane the usual East Dulwich reference point on the site plan.
• Rotherhithe (SE16) — basement conversion work in Rotherhithe means warehouse conversions, post-war estates, new-build. Rotherhithe is warehouse conversions, riverside. Post-war slab foundations make basements here expensive and rarely viable throughout SE16. Southwark Council decides the Rotherhithe application, and Surrey Quays anchors the Rotherhithe location plan.
• Elephant and Castle (SE1, SE17) — a basement conversion in Elephant and Castle starts from post-war estates, new-build towers, and Elephant and Castle reads as regenerated quarter, modernist origins. Post-war slab foundations make basements here expensive and rarely viable in SE1. Southwark Council assesses Elephant and Castle basement conversions against its own Elephant and Castle character guidance, and the location plan we draw for Elephant and Castle references Elephant and Castle station.
• Nunhead (SE15) — basement conversion work in Nunhead means victorian terraces. Nunhead is Victorian terraces around the cemetery. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged throughout SE15. Southwark Council decides the Nunhead application, and Nunhead Cemetery anchors the Nunhead location plan.

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

How designation changes a Southwark basement conversion: Southwark Council maintains 43 conservation areas, including Dulwich Village, Peckham Rye, Borough. Inside any of them a Southwark basement conversion 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. Bermondsey Street sets the tone for Southwark casework.

Article 4 and your Southwark basement conversion: Article 4 for HMOs borough-wide; additional Article 4 for office-to-residential in Bermondsey and Elephant & Castle. At a SE1 address that matters twice over, because Southwark Council applies the direction unevenly across Southwark — we read the Southwark policies map for the exact SE1 address before quoting basement conversions.

Southwark housing stock: Georgian and Regency in Bermondsey and Borough; Victorian terraces in Camberwell and Peckham; Dulwich Estate controlled housing; riverside new-build. Dulwich Estate private planning scheme affects much of SE21 and SE22; Southwark planning for rest of borough; strong heritage context. Read that before choosing a basement conversion route in Southwark — construction, not postcode, sets what is achievable. Southwark Council charges £548 for a householder application and has 8 weeks to determine it.

Which neighbouring authorities border Southwark?

• Lewisham — the Lewisham boundary runs against Southwark, so a basement conversion a street from Southwark is decided by Lewisham Council instead. Lewisham runs 30 conservation areas across SE3 and its neighbours, which is why basement conversions priced for Southwark are re-checked against Lewisham policy whenever the Southwark address sits on that edge.
• Bromley — the Bromley boundary runs against Southwark, so a basement conversion a street from Southwark is decided by Bromley Council instead. Bromley runs 48 conservation areas across BR1 and its neighbours, which is why basement conversions priced for Southwark are re-checked against Bromley policy whenever the Southwark address sits on that edge.
• Tower Hamlets — cross the Southwark boundary and Tower Hamlets Council takes the basement conversion instead, applying 58 conservation areas of its own around E1. We re-price basement conversions at the Southwark edge because Tower Hamlets policy and Southwark policy rarely align on basement conversion depth.
• City of London — adjoining Southwark, with 27 conservation areas centred on EC1. A basement conversion on the far side of the Southwark line is determined by City of London Corporation, so the Southwark quote for basement conversions is checked against City of London guidance before it is issued.

Sources for this Southwark 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.