Dormer loft conversion drawings in Bromley

Article 4 directions, conservation areas and green belt in Bromley

Bromley has 47 conservation areas and 108 published Article 4 directions. A direction can remove the right to change a roof slope, and inside a conservation area a dormer needs planning permission.

The borough also has 412 listed entries from Historic England, and about 51 per cent of its area falls under green-belt designation. On outlying houses that matters for later extensions, so we ask about your wider plans before we fix the dormer's size.

Where none of that applies, the permitted development volume applies: 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume. We design inside it where possible, because it avoids the application and its fee. The same rules require exterior materials that are Exterior materials similar in appearance to the existing house, so we choose a finish by looking at the existing roof, not at a catalogue.

How Bromley and the Inspectorate treat householder cases

Bromley decided 1,609 householder applications in its latest published year and granted 78.6 per cent. 89.1 per cent were decided within eight weeks or an agreed extension, so a planning route needs allowing for in your programme.

The Planning Inspectorate decided 502 householder appeals here and allowed 37.6 per cent of them. That shows that refusals are sometimes overturned, but an appeal is a long process, and the better course is a design that suits the roofscape at the first submission.

These are borough-wide numbers for all householder work. They do not tell us how your own application will be treated.

Bromley dormer loft conversion drawings: contents and cost

A Bromley dormer set contains the existing and proposed plans, the roof in section, all elevations and the location and block plans. Where the street context matters, we add a street-scene elevation, because Bromley's test is about the roofscape.

The stair follows 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 new storey needs a protected escape route, and the rule is 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). Both go on the plans. The new dormer roof also has an energy target: 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. Deep insulation lifts the dormer, so we draw the build-up before fixing the height.

The price is £695 including VAT, fixed in advance. A second MCIAT chartered architectural technologist checks the set, and we redraw free of charge if the council asks for changes.

Related drawings in Bromley and the boroughs around it

For a roof that suits a different form, compare loft conversion drawings in Bromley or the wider L-shaped dormer drawings in Bromley. A rear addition at the same time is covered by rear extension drawings in Bromley.

Next door, the guidance differs: see dormer loft conversion drawings in Bexley, in Croydon and in Lewisham. The borough overview is architectural drawings in Bromley, and the national rules are on the dormer loft conversion drawings hub.