Dormer loft conversion drawings in Bexley

Conservation areas and listed houses in Bexley

The borough has 23 conservation areas and Historic England records 114 listed entries within its boundary. Inside a conservation area the permitted development right for a roof enlargement is removed, so a dormer needs a planning application.

About 17 per cent of the borough is covered by green-belt designation, which matters for outlying houses more than for a suburban street. We confirm the route from your address before quoting, so you know early whether the dormer needs an application.

Where the house keeps its rights, the national volume allowance applies: 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume. The dormer must also stay off a roof slope that fronts the road.

How Bexley has decided householder applications

Bexley decided 877 householder applications in its latest published year and granted 94.6 per cent. 99.4 per cent were decided within the statutory period or an agreed extension.

Those figures cover every kind of householder project and say nothing about your roof. A dormer that ignores the rear-facing and set-back tests gives the officer a ready reason to ask for changes, whatever the borough average.

We use the figures to set a realistic timetable. Speed helps when a builder is waiting, but a drawing set that needs a revision still costs time.

Inside a Bexley dormer loft conversion drawing set

The set shows the existing and proposed floor plans, the stair, the dormer in section with its flat-roof build-up, and every elevation. It comes with location and block plans for the application.

The stair is drawn to the loft rule in the building regulations: Loft conversions where 2.0 m cannot be achieved: 1.9 m at the centre of the stair, 1.8 m at the side (half width). The roof over the dormer is drawn to the insulation target for new elements: New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4. The thickness of that insulation adds height, so we put it on the section before the dormer height is fixed.

A new storey also needs a protected escape route: New storey above 4.5 m by loft conversion: protect the full escape route with fire-resisting doors (min E 20) and partitions (min REI 30). We show the doors and partitions on the plan so the builder prices them from the start.

The price is £695 including VAT, fixed before you commit. A second MCIAT chartered architectural technologist checks the sheets, and we redraw at no charge if the council asks for changes before approval.

Dormer drawings in Bexley and the boroughs beside it

Some Bexley roofs suit rooflights alone: see loft conversion drawings in Bexley. A house with a rear wing may suit the wider form in L-shaped dormer drawings in Bexley. If you are extending on the ground floor too, rear extension drawings in Bexley cover that.

Across the border, the rules change. Compare dormer loft conversion drawings in Bromley and in Greenwich, or go to architectural drawings in Bexley for the full borough picture and the dormer loft conversion drawings hub for the national rules.