A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessibility — submitted to LABC or your approved inspector with structural calculations coordinated.
A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessibility — submitted to LABC or your approved inspector with structural calculations coordinated.
Housing stock in Lewisham: Victorian and Edwardian terraces across Brockley, Honor Oak, Forest Hill; 1930s semi-detached in Catford and Hither Green; post-war mixed in Deptford.
Character: Generally permissive planning compared to central boroughs; loft conversions and side-return extensions routinely approved under PD.
Plans, sections and elevations at 1:50 with full annotation and material specification.
U-values for walls, roof, floor and glazing; SAP or SBEM where required; compliance statement.
Chartered engineer sign-off on beams, pad foundations, lintels, roof structure.
Escape routes, compartmentation, smoke alarms, fire-rated construction detail.
Soil and vent pipe routes, MVHR coordination, EV charging (Part S).
Full Plans submission to Lewisham Council Building Control or an approved inspector with inspections coordinated through to completion certificate.
Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Direct answers to the questions Lewisham homeowners ask every week about building regulations drawings.
Start a free quote →In Lewisham, you can submit building regulations applications to either Lewisham Council's in-house Building Control (LABC route) or to a private approved inspector. Both routes produce the same legally-valid completion certificate. We submit to whichever suits your project and builder.
Fixed fees in Lewisham start at £840 for a straightforward extension or loft. Complex projects (HMOs, basement conversions, flat splits) range £1,500–£2,500. Structural calculations are £350–£1,050 depending on the intervention.
Yes — every habitable loft conversion in Lewisham (and across England) requires Building Regulations approval covering fire escape, floor structure, insulation and staircase. This is independent of whether you also need planning permission.
Part L of the Building Regulations sets minimum energy-efficiency standards — insulation, glazing U-values, air permeability, heating efficiency. New extensions in Lewisham must meet the 2025 uplift (Future Homes Standard transition). We include full Part L calculations and a compliance statement in every Complete package.
Once submitted, Lewisham Council Building Control reviews Full Plans within 5–8 weeks. Approved inspectors typically review in 2–4 weeks. On-site inspections run through the build — typically 6–10 visits depending on scope.
In Lewisham, building regulations are required for: loft conversions, extensions, structural alterations, roof replacements, new openings in walls, and any work to a flat. Some minor works (like-for-like replacements, small porches) are exempt. We confirm at the free site visit.
A completion certificate from Lewisham Council Building Control (or an approved inspector) confirms your works comply with Building Regulations. It is essential for selling or re-mortgaging — lenders and conveyancers require it. We manage the inspection sequence and close out sign-off as part of every Complete package.
Extensions and loft conversions in Lewisham that change the building's energy characteristics require an updated EPC (or SAP/SBEM calculation as part of Part L compliance). We include Part L calculations in every Complete and Bespoke package.
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 Lewisham 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 £1,225. Every loft type across every Lewisham roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning ro...
From £1,225. The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with ...
From £1,575. Lewisham's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards tha...
From £995. Turn your unused Lewisham 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 Lewisham — structural underpinning des...
From £350. Chartered structural engineer calculations for every residential intervention in Lewisham — steel beams, lintels, pad fo...
From £540. Fixed-fee measured surveys across Lewisham from £540 — floor plans, elevations and sections to ±3mm accuracy. Leica Dist...
From £450. End-to-end Party Wall Act 1996 service for Lewisham — Section 1, 3 and 6 notices, schedule of condition surveys, party w...
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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Free quote in 60 seconds. Fixed fee from £840. MCIAT chartered.
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