Kitchen Extensions Brentwood

A kitchen extension in Brentwood is most often built on a semi or detached house: 40% of homes in the town are semi-detached or detached, against 19% terraced and 32% flats. The terraces get the narrower side return or rear infill, and the flats cannot use householder permitted development at all. We build the shell, the steel and the kitchen in one programme, working from the drawings Brentwood Borough Council asks your designer to submit.

For Brentwood, 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; Essex work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Brentwood: 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.

What Brentwood planners want drawn for a wraparound or boundary extension

A side extension that turns the corner and wraps around the back of the house needs drawings of all four elevations, according to Brentwood's householder guide. That is more drawing work than a simple rear box, so we agree the wrap early with your designer. The plans must also state the total area of the extension, which gives everyone one figure to check the kitchen layout against. A missing elevation can hold up validation.

Where the rear addition sits on the boundary with an attached house, Brentwood wants the drawings to show the neighbour's rear windows and doors. The guide says this is because their light or outlook may be affected. On a semi, that means someone measuring the next door kitchen window before the design is fixed. We note those positions on our first visit and pass them to your designer, who sets the roof height and glazing with the neighbour in mind.

Housing in Brentwood

About 25,620 homes are listed for Brentwood, and the mix is 68% houses to 32% flats, with 78% built after 1945, 11% in 1919 to 1939 and 11% earlier. A semi in Brentwood can take its kitchen extension across the back and round into the side passage, which leaves room for a utility behind the kitchen, and 21% of homes here are semi-detached.

A bigger kitchen can change the parking the council expects

Adding bedrooms can trigger a requirement to alter parking arrangements in Brentwood, and the standard space is 2.5m by 5.0m. A kitchen extension on its own adds no bedroom. Some schemes, though, combine it with a bedroom over the new room or turn the old dining room into a ground floor bedroom. If that is your plan, the drive and front garden need checking before the application goes in. Your designer can then show how the parking works on the same drawings.

The site location plan goes in at 1:1250 in urban parts of the borough or 1:2500 in rural parts, with the site layout at no less than 1:500. Elevations and floor plans usually go in at 1:100 or 1:50. Those are the sheets on which a parking space and a new kitchen footprint are both measured, so we build from the same set. That saves arguments about dimensions later. We keep a printed copy on site.

Clay, sand, drains and trees decide how the kitchen floor is founded

The British Geological Survey names the London Clay as very susceptible to volume change, shrinking and cracking as it dries and swelling after rain. Brentwood town centre sits on a ridge of Claygate Beds and Bagshot Sands over that clay, so the ground under one garden can differ from the next. The structural engineer we appoint sets the foundation depth from what is found, and Brentwood building control inspects the excavations and prepared foundations before concrete goes in.

Where a tree protected by a Tree Preservation Order stands near the line of the extension, nobody may cut its roots or damage it without the council's prior permission. Root damage counts. A kitchen extension often goes into the part of the garden where the old trees are, so we check for an order before the digger arrives, then plan the trench and the new drain run around the tree.

Drains under a Brentwood kitchen extension are inspected before backfilling

Brentwood building control inspects new drainage before the trench is backfilled, so the pipe runs are fixed and seen before the floor goes down. A kitchen extension usually moves the sink, adds a dishwasher and sometimes a utility room, and all of it has to reach the existing drain. We survey the run and the inspection chambers before the layout is fixed, so the kitchen does not end up with a long, shallow pipe that blocks.

The new roof also sheds more water, and roof lights and a flat roof collect it quickly. We route the rainwater separately from the foul drain where the existing system allows it, and the pipework is seen at the same inspection before it is covered. The kitchen fitter then works to fixed waste positions rather than chasing a gully that moved during the build. Gutters and downpipes are fixed before the fascia is finished.

• Kitchen-diner layouts planned before the foundations
• Boiler relocation and flue changes on the enclosed rear wall
• New kitchen circuits, with Part P certification from a registered electrician

VOA Council Tax stock of properties, March 2025, for all 6 statistical areas in Brentwood. Counts rounded by the VOA.

Useful next reading for a kitchen extensions project in Brentwood: kitchen renovation in Brentwood, kitchen extensions in Hornchurch, a side return kitchen infill, party wall notices for a kitchen extension, our London kitchen extensions page and Underfloor Heating Costs.

Why Choose GS Renovation in Brentwood

We run the kitchen extension as one job: foundations, drainage, steel, roof, glazing, then the kitchen itself, with one team and one programme. The structural engineer we appoint does the calculations and we build to them. We book each building control inspection and keep the paperwork together for the completion certificate. You get a firm price after a site visit, and we tell you before work starts which drawings and approvals your designer or agent still needs to provide.

• New floor level matched to the existing house, with no step at the opening
• Aftercare and snagging support once the job is finished
• Screed left to dry before the kitchen floor finish goes down

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.