L-shaped dormer drawings in Wandsworth

Constraints on Wandsworth roofs

The borough has 46 conservation areas and 312 listed buildings. Inside a conservation area: Class B roof enlargements are not permitted development on article 2(3) land. Whether your street is one of them is the first thing we check, from the postcode, before any design time is spent.

There is no green belt in the borough: the figure is 0 per cent. Domestic gardens make up 21.5 per cent of the land, so rear views are shared by many houses and objections about overlooking can come from several directions.

If you are combining a dormer with a basement, the same Housing SPD covers both.

What the record says about householder applications

In the latest year the council decided 977 householder applications and granted 91.9 per cent, with 92.4 per cent decided inside eight weeks or an agreed extension.

These are every-kind-of-householder figures. The record that matters for you is the one on your own street, so we search the council's planning register for roof extensions near you and attach the nearest approved dormers to the covering note.

Pay attention to timing as well as outcome. The council's own register shows the date each case was validated and decided, so you can see how long comparable roofs took and plan the builder's start around it.

Wandsworth's Housing SPD is one document for several kinds of work, so a scheme that combines a dormer with a rear extension or basement is assessed together. We keep the drawings for those parts consistent, so the roof plan, the ground floor and the sections never disagree. Our next-steps pack lists the order of events from validation to start on site, so you know when the builder can be booked.

Building details on the drawings

At the outrigger the eaves and set-back rules are relaxed: Eaves-retention and 0.2 m set-back do not apply where the enlargement joins the original roof to the roof of a rear or side extension. Height stays inside the original ridge: No part higher than the highest part of the existing roof.

Wandsworth terraces back onto each other, so notices apply: Party structure notice at least 2 months before work. Stairs often decide the plan; where full headroom is impossible: 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).

A new top storey brings fire provisions: 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). These go into your technical drawings.

Fees, and the levy zones

There is no standard price for L-shaped dormers. You receive a fixed quote after a free constraints check, VAT included, and we redraw free if the council asks for changes.

The borough's levy depends on where you live: £1,031.39/m² (Nine Elms Residential Area A); £475.34/m² (Nine Elms Residential Area B); £0 (Roehampton Charging Area); £448.43/m² (all other areas). The Mayoral levy is in band 1 at £96.97 per square metre this year. Whether either applies depends on new floor area, and the next-steps pack sets it out.

You will also get a plain-English summary of the sequence: survey, design options in 3D, a frozen design, a second-technologist check, then submission. Each step has a date, so the builder can see when the drawings will be ready and when notices need to go out.

Other services and neighbouring boroughs

For a plainer roof, see dormer loft conversion drawings in Wandsworth, and for the full range loft conversion drawings in Wandsworth. The borough overview is architectural drawings in Wandsworth.

We also draw L-shaped dormers in Lambeth, Merton and Richmond upon Thames. The service guide is L-shaped dormer drawings.