Loft conversion drawings in Kingston upon Thames

Conservation areas, Article 4 and listed houses in Kingston

Kingston has 28 conservation areas, and inside one a roof enlargement is not permitted development. The borough also publishes 3 Article 4 directions that cover 114 mapped areas, so a direction can apply even to a house outside a conservation area. We read the direction text for your road.

Historic England lists 163 entries here. A listed house needs listed building consent for roof alterations, drawn with a heritage description.

Surveying a Kingston roof

The piggyback test depends on measurements: plot width, front set-back, eaves height and ridge height. Our survey takes all of them, with the chimney, party walls and floors below on one datum. Without that, the rule cannot be checked, and a guess at the limit risks a drawing the council has to send back.

The same survey places the new stair. Building regulations allow lofts 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 stair often decides the loft layout, whatever the roof form.

A new storey must also have a protected escape route: 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). On a narrow-plot house that can leave little room on the landing, which is a further reason to settle the stair before the roof form. The roof must meet the insulation standard for new elements as well, and the section shows how much height that build-up takes.

Permitted development or planning permission for a Kingston loft

A piggyback roof raises the ridge, and permitted development does not allow any part of the roof to go higher than the highest existing part. That means a piggyback always needs planning permission, however the street is designated. The national rule reads: No part higher than the highest part of the existing roof.

A rear dormer within the volume limit can still qualify as permitted development on a house outside a conservation area and Article 4 area, and a Lawful Development Certificate in Kingston upon Thames confirms it. Otherwise, the route is a householder application, drawn as in our planning drawings in Kingston upon Thames.

How Kingston decides householder applications

Kingston decided 742 householder applications in its latest published year and granted 83 per cent. 92.5 per cent were decided within eight weeks or an agreed extension.

These figures cover every householder project and do not predict a loft application, so we use them only to plan around the eight-week clock.

What the loft drawings include and cost in Kingston

The set shows existing and proposed floor plans, the stair, the roof in section and every elevation, with the location and block plans. Loft conversion drawings start at £695, VAT included, fixed before you commit, and are 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. The new roof and stair then pass into our building regulations drawings in Kingston upon Thames.

If you are weighing a piggyback against a dormer, we price the alternatives on the same survey, so you can compare the floor area each adds against what each asks of the council.

Nearby boroughs and other roof forms

For the common rear box, see dormer loft conversion drawings in Kingston upon Thames. For the whole borough, start at architectural drawings in Kingston upon Thames. Over the boundary, compare loft conversion drawings in Merton or Richmond upon Thames.