Dormer loft conversion plans in Richmond upon Thames

Often not. A rear box dormer within 40 cubic metres on a terrace, or 50 on a semi or detached house, set back at least 20 centimetres from the eaves and kept below the ridge, is usually permitted development. In Richmond upon Thames you will need a full application to Richmond upon Thames Council for a front or side dormer, a box that exceeds the volume, and any dormer in a conservation area such as Richmond Green and Twickenham Riverside, where those rights are removed.

The permitted-development limit is a volume, not a footprint: 40 cubic metres of added roof space on a terraced house and 50 on a semi-detached or detached one, and any earlier loft enlargement counts against that total. In Richmond upon Thames the box must also sit below the ridge and back from the eaves. We measure your roof and calculate the exact volume you have left before drawing. Richmond upon Thames Council is the decision-maker.

Not under permitted development. A dormer on the front roof slope, or one facing a highway, always needs a full application to Richmond upon Thames Council, because it changes how the house reads from the street. Rear box dormers are far more likely to be approved — or to be permitted development outright — which is why almost every Richmond upon Thames dormer we draw sits on the back slope.

Often, on a terrace or semi. If the dormer or the loft steelwork meets the party wall with your neighbour, the Party Wall etc. Act applies and notice must be served before work starts — separately from Richmond upon Thames Council's planning decision. We flag the party-wall junction on the drawings so a surveyor can be appointed early and the build is not held up.

If your dormer is permitted development, a lawful development certificate from Richmond upon Thames Council is council-stamped proof of it — worth holding, because a buyer's solicitor will ask for it when you sell. We prepare and submit the certificate with the same measured drawing pack that shows the box within its volume allowance.

We price each Richmond upon Thames dormer individually, because the roof pitch and the volume left vary house to house, and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Richmond upon Thames Council approves, and we confirm at the outset whether your box is permitted development or needs an application. Call 020 7864 7245 to start.