TEMBOK Design & Build
House Extensions That
Expand How You Live
Across Kent
Rear extensions, side returns, wrap-arounds and two-storey additions — designed to maximise your living space, flood rooms with natural light and add lasting value to your property.
5-star rated on Google · Extensions that transform how families live
Why Extend Your Home Instead of Moving?
A house extension adds the space you need without the cost and upheaval of moving. Stamp duty, estate agent fees, legal costs and removal expenses for a larger property in Kent easily exceed £30,000–£50,000 — often more than the cost of a well-designed extension that adds equivalent space.
Extensions allow you to stay in the area you love, keep your children in their schools, maintain your commute and your community connections — while gaining the kitchen-diner, extra bedroom, home office or family living space your home currently lacks.
At TEMBOK, we design and build extensions across Kent that integrate seamlessly with existing architecture. Whether you need a single-storey rear extension in Cranbrook, a side return in Tunbridge Wells, or a two-storey addition in Ashford — we manage the entire project from design to completion.
We coordinate architects, structural engineers, building control, groundworks, structural build, roofing, services and interior finishing. One point of contact, one accountable team, one consistent standard throughout.
Why This Matters
What Happens When Your Home No Longer Fits Your Life
Families outgrow their homes. Children need their own bedrooms. Remote work demands a proper home office. Kitchens that were adequate for two people cannot function for a family of five. These are not luxury problems — they are daily frustrations that affect quality of life.
The cost of moving to a larger property has risen sharply across Kent. In many areas, the price difference between a three-bedroom and four-bedroom home exceeds the cost of adding the space through an extension — and you avoid stamp duty on the difference.
Delaying an extension means continuing to live in cramped, inadequate spaces. Rooms serve double duty. Storage overflows. Family members compete for space. The psychological toll of living in a home that does not fit your needs is significant and ongoing.
A well-planned extension solves these problems permanently. It adds the specific space you need, designed exactly how you want it, in the home and location you have chosen to live in.
Our Process
How We Build Your Extension
Design & Planning
We survey your property, discuss your requirements and coordinate with architects to create plans. We manage planning applications and Permitted Development confirmations.
Structural Engineering
Structural calculations for foundations, steelwork, lintels and connections. Building control application submitted with full engineering details.
Groundworks & Foundations
Excavation, foundation pouring, drainage connections and damp-proof courses. All inspected and signed off before the superstructure begins.
Structural Build
Walls raised, steel beams installed, roof constructed, windows and doors fitted. The extension is made weathertight and connected to the existing building.
Internal Completion
Insulation, plumbing, electrics, plastering, joinery, flooring, kitchen or bathroom installation (if applicable), decoration and final building control sign-off.
What You Get
What a TEMBOK Extension Delivers
Designed Around Your Family
Not a generic box added to the back. We design layouts that work with your daily routines, traffic flow and how you actually use your home.
Seamless Integration
Matching brickwork, roofing materials and architectural details. Your extension looks and feels like it was always part of the original building.
Natural Light Maximised
Large glazing areas, bi-fold doors, roof lanterns and clerestory windows bring daylight deep into the extended space and the existing rooms beyond.
Strong, Compliant Construction
Engineered foundations, properly specified steelwork and construction that exceeds minimum building regulations. Built to last the lifetime of your home.
All Trades Coordinated
Groundworks, masonry, roofing, steelwork, plumbing, electrics, plastering, joinery and decoration — all managed by our team.
Fixed-Price Contracts
Detailed specifications and transparent pricing. No unexpected charges for standard items that should have been included.
Extension Types We Build
Single-Storey Rear Extensions: The most common extension type, adding a kitchen-diner, family room or living space at the rear of your property. Under Permitted Development, you can extend up to 4m from a detached house or 3m from a semi-detached/terraced house without planning permission (or 6m/8m under prior approval).
Side Return Extensions: Ideal for terraced and semi-detached properties with narrow side passages. A side return extension opens up the ground floor by incorporating the side alley into the kitchen or living space, creating a wider, brighter room.
Wrap-Around Extensions: Combining a rear and side extension to maximise ground floor space. Wrap-arounds create large, open-plan kitchen-living-dining areas and are particularly effective on corner plots or properties with generous gardens.
Two-Storey Extensions: Adding space on both ground and first floors simultaneously. Two-storey extensions typically require planning permission but offer the best space-per-pound value, adding both living space and bedrooms/bathrooms.
Orangeries & Garden Rooms: Flat-roofed extensions with roof lanterns, combining the open feel of a conservatory with the thermal performance and solid construction of a traditional extension. Suitable as kitchens, dining rooms or living spaces.
Connecting to Existing Structure: The junction between the extension and the existing building is critical. We properly tie new walls into existing masonry, install cavity trays and flashings to prevent water ingress, and ensure the damp-proof course is maintained continuously.
We build extensions throughout Kent including Cranbrook, Tunbridge Wells, Ashford and Maidstone.
Common Questions