Loft Conversions & Extensions in Chislehurst

What we do in Chislehurst

Loft conversions, rooflight and rear dormer

Hip-to-gable conversions

Room and rear extensions

Side return and wrap-around extensions

Full house refurbishments and rewiring

Kitchen design and installation

Bathrooms, wet rooms and en-suites

Structural openings, steel beams and foundations

Roofs, tiling and rooflights

Before we price

In Chislehurst the roof is the question

Bromley has published no characterisation study of the borough, so we are not going to tell you what your house is like. Its own Local Plan review says a robust evidence base, including a characterisation study, would be necessary. What we can tell you is what we go up and look at, because in Chislehurst the roof decides most of it.

Ridge height first. From the top of the joists to the underside of the ridge you want roughly 2.3 metres before a conversion is comfortable, and ten minutes with a tape settles it. Then the shape: a hipped roof usually wants the hip squared off before a dormer earns its keep, and that is a bigger job than a dormer alone. Then the water tank, the chimney breast and where a staircase can land without losing a bedroom below.

Then the two lines on the map: whether you are inside the Chislehurst conservation area, and which side of the Article 4 boundary you sit on. Those two decide whether your loft is a building job or a planning application, and they are the first things we check.

Loft floor lifted to expose the joists and run new services

Insulation between the rafters with the rooflight opening formed

Plasterboard going up around the original timber beams

The finished room with slatted oak panelling and carpet

Loft conversion near Chislehurst

Planning in Chislehurst

What the Article 4 direction allows

Chislehurst is named in Bromley’s Article 4 direction

The direction removes the permitted development right to add up to two storeys on certain homes, in sixteen areas across named wards, and Chislehurst ward is one of them. If adding a full storey is what you had in mind, that means a planning application here, not a build.

The conservation area changes what a loft needs

The Chislehurst conservation area was designated on 1 January 1971 and covers a large part of the town. Inside it, permitted development for roof additions such as a dormer is removed, so a dormer needs a planning application. Rooflights are treated separately and are usually still allowed, though not on a slope fronting a highway. Outside the boundary, a rear dormer within the size limits normally goes ahead without an application.

The direction that does not apply here

There is a separate roof-alterations direction that took effect on 19 July 2022 for the Chislehurst Road conservation area. Despite the name, Chislehurst Road is in Petts Wood, not in Chislehurst. We mention it because it is easy to read online and conclude the wrong thing about your own roof.

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How we work

How we run a job in Chislehurst

01

First visit

We measure, go up into the loft with a tape, check the drains run, and talk through what you want against what the house will take. Fixed price follows, agreed before anything starts.

02

The map check

Whether you are inside the conservation area and which side of the Article 4 boundary you are on. This is where a loft either stays a building job or becomes a planning application, and you find out on day one rather than week six.

03

Drawings and notices

Architect’s drawings, structural calculations, party wall notice to your neighbour, building control application. Design and approvals typically add eight to sixteen weeks before we’re on site.

04

Structure

Steel or timber to carry the new floor, the roof opened up and framed, insulation, and the staircase formed. The house stays watertight throughout.

05

Fit-out

First fix electrics and plumbing, plastering, joinery, decoration. Same team throughout, so nothing’s handed off.

06

Sign-off

Building control completion certificate, and we walk the job with you before the final payment.

Three jobs near Chislehurst

Blackheath, SE3

Before

Insulation going in across the new floor, Blackheath, SE3

After

Rooflight over the bed area, Blackheath, SE3

The new opening and stair head, Blackheath, SE3

Grove Park, SE12

Before

The old bath and tiling, Grove Park, SE12

After

Bath with the black-framed screen, Grove Park, SE12

Vanity unit and concealed cistern, Grove Park, SE12

Eltham, SE9

Before

After

Open shelving and metro tiling, Eltham, SE9

What it costs

See the full cost guide

Velux Loft Conversion illustration showing rooflights set into the existing roof slope

Rooflight loft conversion

Rooflights into the existing slope with no change to the roofline. The option least affected by the conservation area, and the one to check first if you are inside it. All three are starting points from our cost guide, not an estimate for your house.

Estimated Cost

Starting from £35,000

Dormer loft conversion

A rear dormer for a full bedroom with en-suite. Inside the conservation area this needs a planning application; outside it, usually not.

Estimated Cost

Starting from £50,000

Hip to gable Loft Conversion illustration showing a wide rear dormer with a run of glazing

Hip-to-gable conversion

Squaring off the hip before the dormer, which is what a hipped roof usually needs before the space is worth having.

Estimated Cost

Starting from £65,000

See the full cost guide

Questions

Questions we get in Chislehurst

01.

Can I convert my loft in Chislehurst without planning permission?

It depends on one line on a map. Inside the Chislehurst conservation area, permitted development for roof additions such as a dormer is removed, so a dormer needs a planning application. Rooflights are treated separately and are usually still allowed, though not on a roof slope that fronts a highway. Outside the conservation area, a rear dormer within the volume limits normally goes ahead without an application. We check your address before quoting, because it changes both the timescale and the cost.

02.

Does Bromley’s Article 4 direction affect Chislehurst?

Yes. Chislehurst ward is one of the areas named in the direction that removes the permitted development right to add up to two storeys. So adding a full storey here means a planning application. It does not stop you converting the roof space you already have, which is a different right and the one most people actually want.

03.

I read about an Article 4 direction for Chislehurst Road. Does that apply to me?

Almost certainly not. The roof-alterations direction that took effect on 19 July 2022 covers the Chislehurst Road conservation area, and Chislehurst Road is in Petts Wood rather than in Chislehurst. It is an easy one to find online and misread, so we check the actual boundary rather than the name.

04.

Is my house in the Chislehurst conservation area?

It may well be. The Chislehurst conservation area was designated on 1 January 1971 and covers a large part of the town. Mavelstone Road in Bickley, Sundridge Avenue and Chislehurst Road in Petts Wood are the nearest others. Bromley has 47 conservation areas in total. We look your address up on the register before anything is drawn.

05.

What does a skip cost in Bromley?

The council’s permit is £50 for fourteen days and they ask for two working days to process it. That is on top of the skip hire itself, and all of it goes in the quote rather than appearing later.

06.

How long does a loft conversion take?

Design and approvals typically add eight to sixteen weeks before anyone is on site, and longer if a planning application is needed rather than permitted development. The build itself is usually eight to twelve weeks for a dormer conversion. You get the programme in writing before we start.