L-shaped dormer drawings in Sutton

Sutton designations, trees and green belt

Sutton has 8 conservation areas and 209 listed buildings in the borough, far fewer than central London. Inside a conservation area: Class B roof enlargements are not permitted development on article 2(3) land. Outside them the right to build is much more open, and we use it where it applies.

About 14 per cent of the borough is green belt. A dormer adds no footprint, so green-belt size tests rarely stop one, but we check whether a house on the edge of the designation has had earlier extensions that count against it.

Gardens are large here. Domestic gardens make up 34.5 per cent of the borough's land in the Generalised Land Use Database, which is why neighbours' views and mature garden trees shape the design as much as the street does.

That openness cuts both ways for a dormer. Long gardens mean the new rear windows are far from the boundary, so privacy objections are rarer than in the inner boroughs. The roof is still seen from many back windows at once, so we show the dormer in a rear elevation with the neighbouring houses drawn in, which lets the officer judge the effect without visiting.

Decision record for householder cases in Sutton

In the latest year the council decided 601 householder applications and granted 91.8 per cent. About 94.8 per cent were decided in eight weeks or an agreed extension.

Those figures cover every kind of householder scheme, so we use them to judge the climate and not your odds. The better predictor is the road: planning history for roofs on your street, and the officer reports behind them, show what the council tolerated.

We pull those precedents into the design and access note when they help. A neighbour's approved dormer, with a similar junction and cladding, is the most persuasive thing we can cite, and Sutton publishes its planning register online.

If the history shows refusals for roofs like yours, we say so before you pay for a full design, and suggest a smaller scheme that avoids the same objection.

Build detail that decides the drawings

The set-back condition normally forces a stepped dormer, but at the junction with a rear wing: 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. That is the provision that allows the L to run as one volume.

Height is limited: No part higher than the highest part of the existing roof. Party wall notices are standard on a semi: Party structure notice at least 2 months before work. We prepare them with the drawings.

Stairs often decide the layout. 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). Fire protection for the new level reads: 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).

Levy, fees and timing

We quote a fixed fee after a free constraints check, VAT included, and redraw free if the council asks for changes. L-shaped dormers have no list price because each roof differs.

Sutton's own levy is £100/m² (Residential, borough-wide), and the Mayoral charge sits in band 3 at £30.3 per square metre this year. Your next-steps pack says whether a charge reaches your dormer, which depends on new floor area.

Where to look next

A plain dormer loft conversion in Sutton is simpler to draw when the roof allows it, and loft conversion drawings in Sutton compares the options. The borough overview is architectural drawings in Sutton.

We draw the same roof type in Croydon, Merton and Kingston upon Thames. The national guidance is in L-shaped dormer drawings.