London Borough of Lambeth
Planning & Conservation in Lambeth
Lambeth runs from the South Bank to the Victorian streets around Clapham Common and Herne Hill. We design extensions, loft conversions, basements and refurbishments across the borough, within its conservation and permitted-development controls.
The London Borough of Lambeth includes Clapham and Herne Hill, with their Victorian terraces and villas around Clapham Common and the Herne Hill and Half Moon Lane junction. The Clapham Conservation Area, centred on the Common, and the Herne Hill Conservation Area both protect this character, so external alterations are assessed and permitted-development rights can be affected — though neither is among the specific conservation areas where Lambeth has added an Article 4 direction on external works.
Lambeth does, however, operate two borough-wide Article 4 directions that affect change of use: one removing the right to convert commercial premises to residential, and, from 2024, one removing the right to convert a family house into a small house in multiple occupation — so both of those changes now need a full planning application anywhere in the borough. For a standard extension, loft or basement, we test the position for the specific property and prepare the drawings needed to obtain approval and build.
How planning works here
London Borough of Lambeth: process for homeowners
Lambeth covers Clapham and other south-of-the-river family streets — Victorian terrace extensions, side returns and lofts against CA character and neighbour amenity.
Householder process
1. Confirm CA and borough edge
Parts of Clapham sit near Wandsworth boundaries. Confirm Lambeth is the determining authority and whether a conservation area covers the address before assuming PD.
2. Terrace extension design
Rear and side-return extensions are assessed for scale, materials and neighbour living conditions. Closet-wing geometry and short gardens make sections decisive.
3. Lofts and roofscape
Rear dormers are the common form; front-slope and mansard proposals face higher scrutiny in CAs. Design fire escape with the loft volume.
4. Validation and technical stages
Complete householder packages; then building regulations, party wall and drainage/build-over where relevant.
Project types & evidence
Side returns
Classic Clapham project type. Success turns on flank, roof form and neighbour windows more than on maximum plan depth.
Basements
Confirm current Lambeth basement policy and evidence requirements for the application date; do not import Camden/RBKC packages wholesale without checking local validation.
Commons-edge and terrace character
Clapham Common-edge streets and inland terraces are not identical. Elevation and outlook arguments should match the actual street type.
Package
Measured existing/proposed plans, elevations, sections; location/block plans; CA detail where required.
Official sources used on this page
Policy and Article 4 maps change. Confirm designations for your exact address on the council’s live planning map before relying on any general description.
Areas we cover
Prime neighbourhoods in Lambeth
Lambeth
Architects in Clapham
We help Clapham homeowners add light and family space to their Victorian terraces and Old Town houses — side-return extensions, lofts and basements — with drawings ready for Lambeth’s planners.
View areaLambeth / Southwark
Architects in Herne Hill
We design side-return extensions, loft conversions and refurbishments for Herne Hill’s Victorian and Edwardian homes, from the streets by Brockwell Park to the leafy roads towards North Dulwich. Getting the right council and conservation position is our starting point.
View areaPlanning in Lambeth: FAQs
Can I turn a house into an HMO in Lambeth under permitted development?
Are Clapham and Herne Hill conservation areas?
Planning a project in Lambeth?
Send us the address, property type and a short description of the work. We will advise whether you are likely to need planning drawings, building regulations drawings, listed building advice or leasehold approval drawings.