Every loft type across every Lambeth roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regulations, structural calculations and party wall notices, all fixed price.
Every loft type across every Lambeth roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regulations, structural calculations and party wall notices, all fixed price.
Housing stock in Lambeth: Victorian terraces in Clapham, Brixton, Herne Hill; Edwardian villas; 1930s and post-war estates in parts of Streatham; Georgian in Kennington.
Character: Mix of dense Victorian residential and post-war estate; strong conservation area coverage; generally design-led planning decisions.
Article 4: Borough-wide Article 4 for HMO conversions; plus office-to-residential restrictions.
We confirm before quoting whether your Lambeth loft has the head height and structural capacity.
Most Lambeth loft conversions qualify for a Lawful Development Certificate. We check Article 4 and conservation constraints first.
Option studies including massing, internal layout and roof geometry.
Staircase Part K compliance, Part B fire escape, Part L insulation, Part E acoustic separation.
Ridge beam, purlins, steelwork, floor joist upgrade, dormer framing — chartered engineer sign-off.
Almost every Lambeth loft triggers Party Wall notices. We draft notices and coordinate with surveyors.
Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Direct answers to the questions Lambeth homeowners ask every week about loft conversion drawings.
Start a free quote →It depends on your exact address in Lambeth. Most standard loft conversions qualify as Permitted Development (no planning permission needed) if under 40m³ for terraced or 50m³ for semi-detached, with matching materials and 20cm eaves setback. However Lambeth has Article 4 Directions that may remove these rights — and flats, conservation areas and listed buildings always require full planning. We confirm permitted development eligibility at the free feasibility visit.
Our architectural technology fees for a Lambeth loft conversion start at £1,225 (planning + building regs + structural). Typical construction build-cost in Lambeth is £45,000–£80,000 for a standard dormer and £65,000–£110,000 for a mansard.
Very often yes in Lambeth. Rear mansards are routinely approved by Lambeth Council where the design matches the terrace — including within conservation areas like Clapham Common. A Heritage Statement and sensitive design following the borough's published guidance are essential for conservation area mansards.
2.3m measured from existing ceiling joist to existing ridge is the practical minimum for a standard conversion in Lambeth. Below 2.2m usually requires dropping the ceiling below (reducing rooms on the floor beneath) or redesigning as a mansard.
Most Lambeth loft conversions trigger Party Wall Act notices — legal notices to all adjoining owners. Rear dormers can also prompt right-to-light considerations in dense terraced streets, particularly in Clapham Common. We handle both processes.
Lambeth's victorian terraces in Clapham, Brixton, Herne Hill stock lends itself to rear dormers (most common), hip-to-gable (semi-detached), and mansard (period terraces and conservation contexts). Velux-only conversions are possible where ridge height allows. We recommend the best structural and planning route at survey.
We cover all Lambeth postcodes — {postcodes} — with surveyors based locally. Survey appointments within 3 working days. Our structural engineer is London-based and attends site when required.
Most Lambeth loft conversions require Party Wall notices to adjoining neighbours — typically for steel beam installation and/or raising the party wall. We can co-ordinate the notice process; our in-house engineer handles the structural element. The Act gives neighbours 14 days to respond.
We cover every London borough with the same fixed-fee approach. If your property sits on a boundary, here are the neighbouring options.
We cover every architectural technology service in Lambeth with one chartered team.
From £840. A fixed-fee, end-to-end service — measured survey, scaled drawings, Design & Access Statement where required, Planning P...
From £840. A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L ther...
From £1,225. The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with ...
From £1,575. Lambeth's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that...
From £995. Turn your unused Lambeth garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full ...
From £1,950. Full architectural technology service for basement digs and cellar conversions in Lambeth — structural underpinning desi...
From £350. Chartered structural engineer calculations for every residential intervention in Lambeth — steel beams, lintels, pad fou...
From £540. Fixed-fee measured surveys across Lambeth from £540 — floor plans, elevations and sections to ±3mm accuracy. Leica Disto...
From £450. End-to-end Party Wall Act 1996 service for Lambeth — Section 1, 3 and 6 notices, schedule of condition surveys, party wa...
From £1,225. London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your ...
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