Kitchen Extension Builders in London
We design and build kitchen extensions that turn cramped, separate rooms into open-plan spaces you actually want to cook and eat in.
All Well Property Services provides professional kitchen extensions across South East London. Prices start from £1,800 per sqm, with typical projects costing £45,000to £90,000. Typical build time: 10–14 weeks. All projects include a fixed-price contract, single project manager, and full Building Control sign-off. Call 020 3920 9617 for a free consultation.
What We Offer
We design and build kitchen extensions that turn cramped, separate rooms into open-plan spaces you actually want to cook and eat in. Rear, side return, and wraparound. One team handles structural steelwork, electrics, plumbing, and Building Control sign-off.
- ✓Single-storey rear extensions
- ✓Side return extensions
- ✓Wraparound extensions
- ✓Kitchen-diner conversions
- ✓Open-plan living spaces
- ✓Structural alterations and steelwork
- ✓Underfloor heating installation
- ✓Full electrical and plumbing fit-out
Typical Investment
£1,800–£2,500 per sqm
Single-storey rear extension
15-25 sqm, standard finish
£45,000 – £70,000
Side return extension
Opening up the narrow alley
£35,000 – £55,000
Wraparound extension
Rear + side return combined
£60,000 – £90,000
Most clients in South London typically invest between £50,000 and £75,000 for a clean, high-quality kitchen extension with modern finishes.
Fixed-price contracts | No hidden costs | 10–14 week typical build
What Affects the Cost?
- •Structural complexity and steelwork required
- •Quality of kitchen units and appliances selected
- •Glazing specification (bifold doors, roof lanterns)
- •Groundwork and foundation conditions
- •Access constraints and parking
Our kitchen extension experience by the numbers
Since launching the business in 2020 we have built kitchen extensions across South East and South West London. Most of the work is single-storey rear extensions on Victorian terraces, alongside wraparound extensions combining side return with rear, side return only, and larger 2-storey extensions. Median project value for a Victorian terrace lands in the £52,000-£62,000 range based on standard mid-range specifications. The boroughs we work in most often: Bromley, Beckenham, Penge, Crystal Palace, Anerley, Sydenham, Forest Hill, Dulwich, and Catford in SE London; Clapham, Battersea, Balham, Putney, Tooting, and Wandsworth in SW London; plus a steady stream of work in Fulham, Brixton, Camberwell, and Lewisham. Specific street and property type knowledge varies by borough. The shared experience is across London Clay foundations, Crittall-style glazing installations, and conservation area applications at multiple London councils.
Accreditations and standards on every kitchen extension
We are NICEIC-approved for electrical work and certify every electrical installation to BS 7671 17th Edition (the IET Wiring Regulations). NICEIC certificates are delivered at handover and are required by mortgage lenders and buyers' solicitors at sale time. All glazing installations are FENSA-registered for installer compliance. FENSA certificates are issued for every window or door installation and registered with the local council, providing the legal proof of Building Regulations compliance for replacement glazing. We carry CHAS (Contractors Health and Safety Assessment Scheme) certification for site safety standards and Public Liability insurance to £5 million. Gas Safe registered engineers handle any boiler relocation or kitchen gas connection work. Structural engineer calculations are commissioned for every project that involves opening up loadbearing walls — we use a chartered structural engineer who specialises in residential conversions. Building Control sign-off is included in every project. Inspections happen at foundation, drainage, structure, insulation, and completion stages. The completion certificate is delivered at handover and is what proves the work is compliant when you sell or remortgage. Where applicable, we apply for Lawful Development Certificates (£103) to give written planning confirmation, and handle any conservation area or Listed Building Consent applications as part of the project.
How we deliver kitchen extension projects
Three commitments define how we run kitchen extension projects. Fixed-price contracts. After the free site visit we issue a fixed-price quote within 48 hours covering labour, materials, structural engineer calculations, FENSA registration, planning fees, Building Control fees, and any conservation area applications. The price doesn't change unless you change the specification. We absorb our own surveying mistakes rather than passing them on. If we miss something, that's our problem, not yours. Single project manager from survey to handover. One person knows every detail, runs the weekly programme, schedules the trades, manages materials deliveries, and reports progress with photo updates throughout the build. They're available by phone throughout the build. If a trade hits a problem, the project manager makes the decision rather than waiting for you to coordinate. Transparent communication. Photo updates are sent throughout the build. The project manager is available by phone during working hours. Any deviations from the contract, programme, or specification are flagged in writing before the work happens. The directors of the company review every contract before it's signed and read every weekly update. We operate from Unit 1 Limes Avenue, Anerley, London SE20 8QR. Companies House number 12721034. 57 verified Google reviews averaging 4.5 out of 5 stars.
Free tools for planning your project
No email required. Get instant estimates and planning answers before you book a consultation.
Kitchen Cost Calculator
Get an instant estimate for your kitchen extension project in South East London. Factor in extension type, size, finish level, and your borough for a personalised cost breakdown.
Kitchen Value Calculator
Estimate how much value a kitchen extension could add to your property. Calculate your return on investment based on your borough, property value, and extension type.
Kitchen Timeline Calculator
Plan your kitchen extension timeline from start to finish. Factor in planning permission, party wall agreements, and seasonal adjustments for a realistic project schedule.
Planning Checker
Check whether your home improvement project is likely to need planning permission or falls under permitted development rights. Covers extensions, loft conversions, and more.
Recent Kitchen Extensions Projects
Kitchen Extensions across South East London
What Our Customers Say
“All Well managed our project from start to finish. The fixed-price contract meant no surprises, and the result is stunning.”
Verified Customer
“Professional team, clean site, and they handled all the paperwork. Would recommend to anyone.”
Verified Customer
“Great communication throughout. They kept to the timeline and budget exactly as quoted.”
Verified Customer
Accredited & Certified
Frequently Asked Questions
- Do I need planning permission for a kitchen extension?
- Most single-storey rear kitchen extensions in London fall under permitted development rights, meaning you do not need a formal planning application. Your extension must stay within specific limits set by the Town and Country Planning (General Permitted Development) Order 2015 — no more than 3 metres from the rear wall for a terraced house, or 4 metres for a detached property, with a maximum eaves height of 3 metres and overall height of 4 metres. However, if your home is in a conservation area such as Dulwich Village or Blackheath, is a listed building, or has already used permitted development allowances through previous extensions, you will need formal approval from your local planning authority. We check all of this during the free site visit and handle any applications on your behalf, including lawful development certificates where needed. Most of the kitchen extensions we build proceed under permitted development without a planning application.
- How much does a kitchen extension cost?
- Kitchen extensions in South East London typically cost between £1,800 and £2,500 per square metre, depending on the specification and complexity. For a typical 20 square metre single-storey rear extension, expect to invest between £45,000 and £70,000 including foundations, steelwork, glazing, electrics, plumbing, and finishes. A wraparound extension combining side return and rear typically costs £60,000 to £90,000. Premium specifications — such as Crittall-style glazing, Corian worktops, or underfloor heating — push costs toward the higher end. These figures reflect kitchen extensions across 25 London boroughs since 2020, typically landing in the £45,000-£70,000 range depending on size and specification. We provide a fixed-price quote after the site visit — the price we quote is the price you pay, with no hidden extras. Building Control fees and structural engineer costs are included in every quote.
- How long does a kitchen extension take to build?
- Most kitchen extensions take between 10 and 14 weeks from breaking ground to completion. The timeline breaks down roughly as follows: foundations and groundwork take 2 weeks, structural walls and steelwork take 2-3 weeks, roofing and weatherproofing take 1-2 weeks, first-fix electrics and plumbing take 1 week, plastering and second fix take 2 weeks, and kitchen fitting with final decoration takes 2 weeks. Wraparound extensions tend to fall at the 12-14 week end of the range due to additional steelwork and foundation complexity. Weather can affect groundwork timelines, which is why we recommend starting between March and October where possible. We provide a detailed programme of works before starting so you know exactly what to expect each week. Your dedicated project manager sends photo updates throughout the build and is available by phone throughout the build.
- What is included in the price?
- Our fixed-price quotes cover everything needed to deliver a finished, usable kitchen extension. This includes foundations and groundwork, structural steelwork and RSJ beams sized by our structural engineer, external walls and roof construction, glazing such as bifold doors and roof lanterns from suppliers like Origin or Schuco, full electrical installation certified by NICEIC to BS 7671 standards, plumbing and heating connections including underfloor heating pipework where specified, plastering, decoration, and flooring preparation. Kitchen unit supply and fitting is included as standard unless you prefer to supply your own units from a specialist like Howdens, Wren, or a bespoke joiner. Building Control fees, structural engineer calculations, and FENSA glazing registration are all included. The only items not typically covered are freestanding furniture, appliances you source independently, and external landscaping or paving beyond the extension footprint.
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