Kitchen Extensions Mitcham

A kitchen extension in Mitcham is shaped by the terraces: 40% of homes here are terraced houses, and 38% were built between 1919 and 1939. An interwar terrace often has a flat back with no back addition, so the job is a full width rear extension; a Victorian terrace with a back addition gets a side return infill. Semis and detached houses, 11%, have room for a wraparound. We build the shell and fit the kitchen as one programme, to your designer's drawings and the approvals you hold.

In Mitcham, 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 (indicative London ranges, Resi, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Mitcham: 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.

Which kitchen extension suits a Mitcham terrace or semi

On a Mitcham terrace the extension type follows the age of the house. Terraced houses are 40% of homes here, and with 38% of the stock built between 1919 and 1939, many of them are interwar, with the kitchen at the back of the main house rather than in a narrow back addition. There the extension runs the full width of the rear wall and the opening into the house takes the steel. On an older terrace with a back addition, the side return infill widens the kitchen instead, and its roof meets the neighbour's wall on the boundary, so that junction is agreed before the steel is ordered.

Semis and detached houses, 11% of homes in Mitcham, have a flank as well as a back. That opens up an L shaped wraparound, which joins the side and rear into one room. It also means two new openings in the house wall, a longer roof and more foundation, so the structure and the drainage runs are worked out together at the drawing stage rather than on site. The corner post is usually where the engineer's detail matters most.

Housing in Mitcham

Count the homes in Mitcham and you get about 10,560: 51% built since 1945, 38% between the wars and 10% before 1919, with flats at 46% and houses at 53%. Terraced houses make up 40% of homes here, and a terrace kitchen extension in Mitcham starts in a narrow side return.

Permitted development limits on a Mitcham rear extension

Under national permitted development rules, a single storey rear extension on any house other than a detached one can go three metres beyond the original rear wall, and four metres on a detached house. With prior approval, and away from designated land, those limits rise to six and eight metres. For a Mitcham terrace that difference decides whether a deep kitchen and dining room is possible without a full householder application.

The original rear wall means the house as first built, so a later extension does not move the starting line and counts against the allowance. Your designer checks the history of the house before the depth is fixed. Where prior approval is needed, we price the extension at the depth being applied for and hold the programme until the decision is back, so no foundations are dug for a room that may have to shrink. If approval comes back, the setting out follows the drawing exactly.

Thames Water sewers and the Merton application route in Mitcham

In Merton a full plans submission must go in before work starts if the extension sits within 3 metres of a Thames Water sewer, where Merton is the building control body. A drain serving more than one house in a terrace is normally a public sewer, so the survey locates that pipe first. If it is close, a building notice is off the table and the build waits for the full plans route. A manhole inside the footprint may also need raising or moving, and building over or near the sewer needs Thames Water's agreement.

Once full plans are submitted, Merton lets work begin after 48 hours' notice of commencement, and anything started earlier is at your own risk. We build that notice into the start date. The first inspections Merton lists for an extension are the excavation for foundations, the oversite, and new walls with below ground drainpipes, so the drainage in a Mitcham kitchen is laid and inspected before the slab goes down.

Kitchen extensions near Mitcham Cricket Green and in flats

Mitcham Cricket Green is one of 28 conservation areas in Merton, designated in 1968. On designated land such as a conservation area, every side extension needs householder planning permission. Merton's fast track householder decision runs up to 46 days inside a conservation area against up to 30 days outside one. A side return on a house inside the Cricket Green conservation area starts later and the order date for the kitchen units moves with it.

If you own a flat or maisonette in Mitcham, householder permitted development does not apply, because those rules cover houses only. A ground floor flat extension therefore goes through a full planning application, and the freeholder's consent is normally a separate step under the lease. We can still build it and fit the kitchen once both are in place, but the programme starts from those two approvals. Pipes and cables in the ceiling void shared with the flat above are traced early too.

• Wet underfloor heating laid in the new screed
• New kitchen circuits, with Part P certification from a registered electrician
• Island units with power and waste run through the slab

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

Related reading for Mitcham homeowners planning kitchen extensions: kitchen renovation in Mitcham, kitchen extensions across Merton, a wraparound kitchen-diner, how building control inspects an extension, our London kitchen extensions page and Kitchen-Diner Layout Ideas.

Why Mitcham Homeowners Choose GS Renovation

We run the extension and the kitchen as one job in Mitcham, so the same site team that sets the steel also plans where the sink waste, the extractor duct and the island supply come through the new slab. The structural engineer we appoint sizes the beam into the house, and a registered electrician certifies the new circuits. You get one programme with the inspection stages marked on it, and one point of contact from the dig to the worktops.

• One contract for the groundworks, the steel and the kitchen fit
• Old kitchen kept in use until the new shell is weathertight
• Honest updates if a date or a detail has to move

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.