London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Bexley property, building regulations, structural steelwork and Party Wall notices, all fixed fee.
London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Bexley property, building regulations, structural steelwork and Party Wall notices, all fixed fee.
Housing stock in Bexley: 1930s semi-detached dominates; Victorian cottages in Bexley Village and Crayford; post-war estates in Thamesmead and Erith.
Character: Outer south-east London suburban; very permissive planning environment; strong PD uptake for extensions and loft conversions.
We confirm whether your Bexley rear dormer qualifies for Permitted Development — checking volume limits (40m³ terraced, 50m³ semi/detached), Article 4, conservation area and prior extension history.
If PD applies, we obtain a Lawful Development Certificate for certainty. If not, we submit full planning with Design & Access Statement to Bexley Council.
Full-width flat-roof rear dormer with matching materials, set in from party walls, cheeks clad to match existing roof — the design that Bexley Council approves most readily.
Part B fire escape (protected staircase, fire doors, smoke alarms), Part K staircase, Part L insulation, Part E acoustic separation.
Steel ridge beam, purlin supports, dormer framing, floor joist upgrade — chartered engineer sign-off for Building Control.
Most rear dormers in Bexley's terraced streets trigger Section 6 Party Wall notices. We draft, serve and coordinate the process.
Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Direct answers to the questions Bexley homeowners ask every week about rear dormer drawings.
Start a free quote →Most loft conversions in Bexley qualify as Permitted Development under the standard householder allowances — up to 40m³ for terraced or 50m³ for semi-detached, with matching materials and 20cm eaves setback. Flats, properties in conservation areas and listed buildings need full planning. We check eligibility at the free site visit. Full-width rear dormers are the most common PD loft type in Bexley — provided the volume, materials and setback conditions are met. We check every condition before committing to a route.
Our fixed-fee architectural package for a Bexley rear dormer starts at £1,225 (drawings + building regs + structural). Typical build costs in Bexley are £45,000–£70,000 for a standard full-width rear dormer with en-suite, depending on access, floor area and specification.
A full-width rear dormer in Bexley typically adds 15–25 square metres of habitable floor area — enough for a double bedroom with en-suite, or two single bedrooms. The flat roof gives full standing height across the entire width of the house, unlike a rooflight-only conversion which is constrained by the roof pitch.
Rear dormers in Bexley's conservation areas usually need full planning permission because PD rights are restricted. However, because they face the rear (not the street), Bexley Council typically views them more favourably than front dormers or mansards. A well-designed rear dormer with matching materials and sensitive proportions has a strong approval record.
A standard rear dormer in Bexley takes 8–12 weeks to build once on site. Our architectural package takes 3–5 weeks from instruction to submission. Building Control approval adds 2–4 weeks. Total timeline from survey to move-in: approximately 4–5 months.
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 Bexley 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. Every loft type across every Bexley roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning rout...
From £1,225. The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with ...
From £1,575. Bexley's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that ...
From £995. Turn your unused Bexley garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full b...
From £1,950. Full architectural technology service for basement digs and cellar conversions in Bexley — structural underpinning desig...
From £350. Chartered structural engineer calculations for every residential intervention in Bexley — steel beams, lintels, pad foun...
From £540. Fixed-fee measured surveys across Bexley from £540 — floor plans, elevations and sections to ±3mm accuracy. Leica Disto ...
From £450. End-to-end Party Wall Act 1996 service for Bexley — Section 1, 3 and 6 notices, schedule of condition surveys, party wal...
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