Kitchen Extensions Chesham

A kitchen extension in Chesham is usually built onto a house, because 75% of homes in the town are houses and 25% are flats. Terraces make up 31% of the stock and semi-detached or detached houses 33%, so the choice is usually between a side return or straight rear addition on a terrace and a rear or wraparound addition on a semi. We build the shell, bring the steel into the house, run the drainage and fit the kitchen as one programme, to the drawings and consents you hold.

For Chesham, on London-derived ranges a rear kitchen extension of about 30 square metres typically costs £45,000 to £97,500 excluding VAT, or £60,000 to £100,000 for a side return; Buckinghamshire work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Chesham: the structural engineer we appoint designs the foundations and steel, we build the room and fit the kitchen, and a registered electrician certifies the electrics.

The shape of a Chesham kitchen extension follows the house type

The house type sets the plan of the extension before anything else does. The 2021 census put 2,964 of the 9,395 Chesham households in semi-detached houses, more than any other type, and a semi usually has room behind it for a full width rear addition or a wraparound that takes in the side passage. The side of the house that stays open decides where the new kitchen door and the bins go.

Terraced houses accounted for 2,551 of those households. On a Victorian terrace with a back addition the extension is often a side return, filling the narrow strip beside it, so both neighbours are close and every wall line matters. A later terrace with a flat back takes a straight rear addition instead. A flat is different again: it has no householder permitted development rights, so any extension to a Chesham flat goes through a planning application and, where it is leasehold, the freeholder's consent as well.

Housing in Chesham

Take the 9,950 or so homes the valuation list gives Chesham: 25% flats, 75% houses, 17% from before 1919, 12% interwar and 71% post-war. 31% of homes here are terraced; a terrace kitchen extension in Chesham starts in a narrow side return.

Garden space and roof finish are the two Chesham design tests

For Chesham, Buckinghamshire Council, the planning authority, applies the Chiltern District Residential Extensions and Householder Development SPD, which warns against a single storey rear addition that takes a disproportionate share of the garden. On the smaller terrace plots in Chesham that is a real limit, so the depth of a rear addition is worth settling on paper before the drawings go in. Moving a rear wall back by half a metre after a neighbour objects costs time on both sides.

Where the extension needs planning permission and the house sits inside the Chesham Design Code Area, which covers the centre, its fringes and the older suburban roads but not the modern outer suburbs, Policy CHESH4 asks it to respond to the code. The code requires plain clay or slate roof tiles and rules out pan, concrete and plastic tiles. A flat roof with roof lights avoids the tile question, but it changes the ceiling height and the glazing, so we price both where the design allows.

Radon protection and ground conditions under a Chesham extension

The BGS Radon Indicative Atlas gives a top band of 5 to 10 per cent for the squares covering northern and north western Chesham, against 1 to 3 per cent in the south and east. UKHSA states that extensions in high radon areas need protective measures under the Building Regulations. The square shows its highest band, so an address check settles your plot. Where protection is needed, a radon barrier goes in the new floor, sealed into the existing house before the slab is poured, with sealed collars round service pipes.

Ground conditions change across Chesham. In the low ground by Lowndes Park, through Newtown and on the Ashley Green Road side, the geological map shows Head, a poorly sorted mix of angular rock debris and clayey hillwash that creeps down the slopes. Foundations in that material are dug to the depth the building control surveyor accepts on the day, which can be deeper than the drawing shows. That is why the trench is always inspected open before any concrete arrives, and why we hold a contingency in the programme for extra depth.

Drainage, inspections and the kitchen fit-out in one Chesham programme

A kitchen extension often moves a drain. Public sewers in Chesham belong to Thames Water, and the town's neighbourhood plan records problems with the capacity and quality of the local network. So we survey the run under the new floor early. We allow for rerouting or a new inspection chamber rather than assuming the old line can stay where it is, and we check whether any public sewer runs close enough to need a build over agreement with Thames Water.

Five building control visits is the normal count Buckinghamshire Council gives for a house extension, with the foundations, the damp proofing, the roof structure and the drains seen before the completion visit. Where the council is your building control body, we book each visit against the programme for your Chesham job, so the steel, the glazing and the kitchen units follow straight on. The kitchen is fitted by the same team once the plaster has dried, which keeps the worktop templating and the last electrics in one sequence.

• Kitchen-diner layouts planned before the foundations
• Party wall process explained, with drawings for your notices
• Airbrick ducts to keep existing timber floors ventilated

VOA Council Tax stock of properties, March 2025, for Chesham West, Chesham East and Chesham South. Counts rounded by the VOA.

If this is your first project in Chesham, these are worth a look: kitchen renovation in Chesham, kitchen extensions in Amersham, a wraparound kitchen-diner, how building control inspects an extension, our London kitchen extensions page and Steel-Framed Doors Guide.

Trusted Kitchen Extensions in Chesham

You get one team from the first survey to the last cupboard door. We check the drawings against the house, arrange the structural engineer we appoint for the steel, dig and build the shell, take the drainage and roof through each inspection, and fit the kitchen in the same programme. You deal with one contact and one written schedule, and each stage building control needs to see is inspected before the next begins, so nothing is covered up unseen.

• Kitchen layout agreed before the foundations, so the services land in the right place
• Registered in England, Companies House no. 14611254
• Building control and Part P certificates handed over together at the end

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.