Loft conversion drawings in Kensington and Chelsea

Listed houses and protected trees

Historic England lists 1,350 entries in the borough, including 18 at Grade I and 116 at Grade II*. A listed house needs listed building consent for roof alterations, and the application is drawn with a heritage description that an ordinary householder set does not include.

The borough also has 4,560 tree preservation orders. A rear loft dormer rarely harms a tree, but access for scaffolding and any related garden work can. We note protected trees on the constraints check.

Where listing or a conservation area applies, we do not treat a neighbour's approved loft as a precedent until we have checked that it sits under the same designation and was decided under the same guidance.

Flats, houses and the right to convert

Only 17 per cent of the borough's households live in a house or bungalow. Permitted development for roofs applies to houses, so a flat owner always needs a planning application, and the lease may need a licence from the freeholder. For a house, the conservation area map and the Article 4 list decide whether the right survives.

Both groups need the same basic drawings. What changes is the route and how much supporting description the council expects.

Surveying the roof and planning the stair

We survey the roof, the chimney stacks, the party walls and the floors below on one datum. From that, we place the new stair first, because a stair that fails building regulations changes everything else. Loft stairs get a concession: 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 roof must meet the insulation standard for new elements, and a new storey needs a protected escape route. We show both in the section and carry them into our building regulations drawings in Kensington and Chelsea.

Where houses share a roof line with neighbours, the survey matters doubly, because a mistake in the ridge or party wall position shows up on both the planning and structural drawings.

Permitted development or planning permission here

A house outside a conservation area, not listed and not under a direction that removes roof rights, may use permitted development. A Lawful Development Certificate in Kensington and Chelsea proves it in writing. For everything else, a householder application is required, drawn like our planning drawings in Kensington and Chelsea.

We tell you which route applies before the fee is agreed, as part of the free constraints check.

Where permission is needed, a short design note goes with the drawings. It sets out how the new roof relates to the original, what can be seen from the street and why the scale suits the building, answering the council's likely questions before they are asked.

How the council decides householder applications

The council decided 664 householder applications in its latest published year and granted 93.7 per cent. 91.9 per cent were decided within eight weeks or an agreed extension.

Those are all householder applications, from basements to windows, so they describe the borough's pace and not the fate of a loft.

Loft drawings and cost in Kensington and Chelsea

The set shows existing and proposed floor plans, the stair, the roof in section and all elevations, together with the location and block plans. Loft conversion drawings start at £695, VAT included, and the fee is fixed up front. Drawings are normally ready about seven days after the survey.

A second chartered technologist checks every sheet, and we redraw at no charge until approval if the council asks for changes.

Related drawings and neighbouring boroughs

Adding space below as well? Try rear extension drawings in Kensington and Chelsea. The borough overview is at architectural drawings in Kensington and Chelsea. Next door, loft conversion drawings in Westminster and Hammersmith and Fulham show how the rules change at the boundary.