House Extensions & Kitchen Extensions in Sidcup

What we do in Sidcup

Kitchen extensions, rear and side return

Single-storey and double-storey extensions

Loft conversions, hip-to-gable and rear dormer

Full house refurbishments and rewiring

Kitchen design and installation

Bathrooms, wet rooms and en-suites

Foundations, steel beams and structural openings

Underfloor heating and floor screeds

Roofs, tiling and rooflights

Sidcup houses

Built in the thirties, made for extending

Bexley Council’s own character study says it in one line: the majority of the borough is semi-detached. Sidcup got most of its houses between the wars, after the by-pass opened and the Falconwood Park estate put two thousand homes on the map in one go. Around the older centre the streets are Victorian and Edwardian, and eight small conservation areas protect the best of them.

For an extension that mix is good news. The semis sit on generous plots, so a rear kitchen extension of three or four metres fits without eating the garden, and a side return is often there for the taking. The hipped roofs mean a loft usually wants the hip squared off before a dormer earns its keep.

The unknowns are the ground and the address. We dig a trial hole before we price foundations, because the depth is decided by what we find, not by a spreadsheet. And we check the conservation map before we draw anything, because a road on it changes what you can do outside without consent.

Inside a rear extension shell with the black sliding doors fitted, before plastering

Underfloor heating pipework laid across the full floor of a kitchen extension before the screed

Grey kitchen units and an oak island being installed in a new rear extension

Oak worktop, undermounted sink and induction hob installed in a kitchen extension

Rear elevation of a 1930s semi with a new brick extension built across the back

Rear extension, 2.7 miles from Sidcup

Planning in Bexley

What the council actually requires

Bexley’s Article 4 direction covers shops

Bexley has a single Article 4 direction and it stops shops and offices in town centres turning into flats. Sidcup Town Centre and Sidcup Station are two of those centres, but it does not apply to houses. A single-storey rear extension inside the national permitted development limits needs no planning application, and most loft work doesn’t either.

Eight conservation areas in Sidcup

Christ Church, The Green, Halfway Street, The Hollies, Longlands Road, Old Forge Way, The Oval, and Willersley Avenue with Braundton Avenue. Foots Cray and North Cray have three more next door. If your road is on that list, external changes need consent and we design around it from the first drawing.

Building control applies to everything

Foundations, steel, damp-proof course, insulation and completion each get an inspection. We book them and meet the inspector, and you get the completion certificate at the end.

Kitchen extension at plastering stage, with the vaulted ceiling skimmed

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How we work

How we run a job in Sidcup

01

First visit

We measure, look in the loft, check the drains run, and talk through what you want against what the house will take. Fixed price follows, agreed before anything starts.

02

Drawings and notices

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

03

Groundworks

Trial hole, then foundations dug and inspected, steel in, damp-proof membrane and slab. If underfloor heating is going in, the pipework is laid and pressure-tested before the screed.

04

Structure and roof

Brickwork, steel beams on padstones where walls come out, roof timbers, membrane, battens and tiles. A single-storey rear extension is usually ten to fourteen weeks on site.

05

Fit-out

First fix electrics and plumbing, plastering, kitchen or bathroom installation, 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.

The two nearest jobs to Sidcup

Induction hob set flush into an oak worktop with a fluted island front

Barrington Road, Bexleyheath DA7

Before

Concrete slab poured and the brick opening formed between house and new extension

After

Finished open-plan kitchen with an oak island, dining table and doors onto the garden

Kitchen run with built-in ovens and tall units in a new extension

Oak larder cupboard with internal lighting, doors open

Refitted shower room with a sliding shower enclosure, wall-hung basin and parquet-effect floor tiles

Mottingham, SE9

Before

After

Sink run under the window in a refitted Mottingham kitchen with grey shaker units

Built-in oven housing and induction hob in a refitted Mottingham kitchen

Refitted Mottingham kitchen looking towards the garden door

What it costs

See the full cost guide

Small Rear Flat Roof extension illustration showing a glazed corner

Small rear kitchen extension

Flat roof, rooflights, doors onto the garden. About £2,000 to £2,500 per square metre, excluding VAT, the architect and planning fees, and we say so on the quote. All three are starting points from our cost guide, not an estimate for your house.

Estimated Cost

Starting from £45,000

Small Side Infill Flat Roof extension illustration showing a rooflight and bi-fold doors

Side return extension

The strip down the side of a semi turned into kitchen. Small side infill, flat roof, the kitchen gets its width back.

Estimated Cost

Starting from £50,000

Large Rear Pitched Roof extension illustration showing a rooflight and bi-fold doors

Large rear extension, pitched roof

A pitched roof to match the house, rooflights in the slope, bi-fold or sliding doors. The one most Sidcup semis end up with.

Estimated Cost

Starting from £60,000

See the full cost guide

Questions

Questions we get in Sidcup

01.

Do I need planning permission for a kitchen extension in Sidcup?

Usually not. A single-storey rear extension of up to three metres on a semi sits inside the national permitted development limits, and up to six metres if the neighbours are consulted under the larger home extension scheme. Bexley has no Article 4 direction that changes that for houses. What does change it is a conservation area, and Sidcup has eight, or wanting something bigger than the limits allow. We check the address on the first visit and tell you which side of the line you are on.

02.

Which parts of Sidcup are conservation areas?

Christ Church, The Green, Halfway Street, The Hollies, Longlands Road, Old Forge Way, The Oval, and Willersley Avenue with Braundton Avenue. Foots Cray, High Beeches and North Cray Village are the nearest others. Inside one, external changes need consent and the drawings are done with that in mind from the start.

03.

How much is a kitchen extension on a Sidcup semi?

From £45,000 for a small flat-roofed rear extension, from £60,000 with a pitched roof, and the price per square metre runs at about £2,000 to £2,500 before VAT, the architect and planning fees. The kitchen itself is on top and depends entirely on what you choose. We quote the build and the kitchen as separate lines so you can see both.

04.

What does a skip cost in Bexley?

The council permit is £65 per application and lasts fourteen days, applied for at least two working days before the skip arrives. If it has to sit in a parking bay, the suspension is £30 a day or £80 a week. That is on top of the skip hire, and all of it goes in the quote.

05.

Will I need a party wall agreement?

On a semi, one, with the neighbour you share the wall with. The notice goes out under the Party Wall etc. Act 1996 before work starts, and most neighbours sign the consent form once they understand what is being built. We prepare it.

06.

What is the usual loft conversion on a Sidcup semi?

Hip-to-gable with a rear dormer. The hipped roof on most interwar semis leaves too little headroom until the hip is squared off, and the dormer then gives a proper bedroom with an en-suite. A plain rooflight conversion is cheaper and sometimes possible. Ten minutes in the loft with a tape tells us which.