Kitchen Extension Builders in Streatham (SW16)
Professional kitchen extension builders in Streatham, South London.
Why Choose All Well for Kitchen Extensions in Streatham?
Streatham's Edwardian terraces and 1930s houses are perfect for kitchen extensions. The terraces have the classic separate-kitchen-and-dining-room layout that opens up beautifully, and the 1930s houses have wider plots that allow more generous extensions. We've worked across SW16 from Streatham Hill down to Streatham Vale, and the pattern is consistent — homeowners want more space, more light, and a kitchen they can actually live in. That's exactly what we build.
Every project comes with a fixed-price contract, single project manager, and full certification including Building Control sign-off.
Kitchen Extensions for Streatham Properties
Streatham is known for its edwardian terraces, victorian semis, 1930s houses. Our kitchen extensions services are tailored to these property types, ensuring results that complement the character of your home.
Postcodes we cover: SW16
Kitchen Extensions Tip for Streatham Homeowners
Lambeth Council covers Streatham and they process permitted development applications efficiently. The Streatham Common and Streatham Hill conservation areas have specific guidelines on materials and roof form — if your property is within one of these zones, we design to conservation standards from the outset. Outside conservation areas, standard permitted development gives you up to 3 metres (terraced) or 4 metres (detached) of extension without a planning application.
Three Streatham kitchen extension patterns
Three patterns cover most of what we build in SW16. Rear extension on an Edwardian terrace is the most common Streatham project. The Edwardian terraces along Streatham Hill, Mitcham Lane, and the streets running off Streatham High Road have a kitchen and dining room separated by a load-bearing wall. We extend 3-4 metres into the rear garden, take out the internal wall with a 152x89 UC or 178x102 UB steel beam, and finish with bifolds across the new rear elevation. Cost is £45,000-£75,000 including foundations on Streatham clay (typically 1.0-1.2 metres), structural steel, glazing, electrics, plumbing, and finishes. Build time 10-14 weeks. Permitted development under Class A covers the standard 3-metre projection. Wide rear extension on a 1930s semi is the second pattern, common around Streatham Common and Streatham Vale. The 1930s semis have wider plots than Edwardian terraces and side access on the detached side. We extend 4 metres into the rear garden across the full width of the existing rear elevation. Cost is £50,000-£85,000. Build time 12-14 weeks. The 1930s semis typically have cavity walls, which makes new insulation tie-in straightforward — cavity fill achieves U-value 0.18-0.21 W/m²K without losing internal floor area. Wraparound extension on a wider Edwardian terrace is the third pattern, suitable on the streets where side returns of 1.0-1.5 metres make a side return infill viable alongside a rear projection. Cost is £65,000-£100,000. Build time 14-16 weeks. Party wall agreement with the neighbouring property is required.
Streatham mixed housing stock — Edwardian solid walls vs 1930s cavity walls
Streatham covers a wider variety of construction types than most South London boroughs, and the right extension approach depends on which era your property comes from. Edwardian terrace construction (most of central Streatham). Built around 1900-1910 with solid 9-inch London stock brick walls, original lime plaster, slate roofs, and timber sash windows. Extensions need internal wall insulation rather than cavity fill — a 50mm PIR-board lining on the existing rear wall achieves the U-value upgrade required by Building Regulations Part L without losing significant internal floor area. Where a wall is being demolished and rebuilt as part of a side return infill, the new wall is built in cavity construction with full-fill insulation. 1930s semi construction (around Streatham Common and Streatham Vale). Built with cavity walls, concrete tile roofs, and bay windows. Extensions tie new insulation directly into the existing cavity using bonded bead or mineral wool fill, which is more efficient than internal lining and doesn't lose internal floor area. The 1930s properties also typically have concrete raft foundations rather than strip footings, which sometimes allow the new extension to tie into the existing raft and save £2,000-£3,000 on groundwork. Streatham Common and Streatham Hill conservation areas. The Streatham Common conservation area covers properties around the Common itself; the Streatham Hill conservation area covers parts of the upper hill streets. Within both, exterior front-facing changes need sympathetic design — front door changes, window replacement, and render colour need conservation review. Rear extensions are generally fine because they're not visible from the street. Lambeth Council has Article 4 directions on some streets near the conservation area boundaries — we verify the planning status of each property at the survey.
Lambeth Council process and project management
Streatham falls under Lambeth Council. Permitted development under Class A covers the standard 3-metre rear projection on a terrace and 4 metres on a semi or detached. The Larger Home Extension prior approval process covers 4-6 metre projections on terraces and 4-8 metres on semis or detached, with an 8-week neighbour consultation. Lambeth typically determines applications in 8-10 weeks. We submit a Lawful Development Certificate (£103, 6-8 weeks at Lambeth) on permitted development projects for written confirmation, which protects the property at sale time. A Streatham kitchen extension involves 12-15 trades over 10-16 weeks: demolition, foundations, drainage, structural steel, brick and block, roofing, glazing, plastering, electrics (NICEIC to BS 7671), plumbing, gas (Gas Safe), kitchen fitting, tiling, flooring, painting. We assign one project manager from survey through handover with photo updates throughout the build. Fixed-price contracts cover labour, materials, structural engineer calculations (£600-£1,200 for the steel and foundation design pack including any concrete raft assessment), Building Control fees (£400-£700 at Lambeth), FENSA glazing registration, party wall surveyor coordination, conservation area applications where relevant, Article 4 full planning where required, and the Lawful Development Certificate or planning fee. Building Control inspections happen at foundation, DPC, drainage, structural steel, insulation (Part L: U-value 0.18 W/m²K for new walls and roof, 1.4 W/m²K for windows), and completion. Glazing is FENSA-registered. Origin or Schüco bifolds and Sieger sliders are standard on Streatham projects. Roof construction is warm-roof with 150mm PIR insulation. Where the extension projects over a Thames Water public sewer, a Build Over Agreement is required (£317 fee plus CCTV survey) and we handle the application.
Kitchen Extensions in Streatham: What's Included
Kitchen Extensions Pricing in Streatham
£45,000 – £90,000
10–14 weeks | Fixed-price contracts | No hidden costs
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
Streatham
“Professional team, clear communication throughout. They handled everything including Building Control sign-off.”
Verified Customer
Streatham
Frequently Asked Questions
- How much does a Streatham kitchen extension cost?
- Rear extensions of 3-4 metres on Edwardian terraces (the most common Streatham project) run £45,000-£75,000 including foundations, structural steel, glazing, electrics, plumbing, and finishes. Wide rear extensions on 1930s semis run £50,000-£85,000. Wraparound extensions on wider Edwardian terraces run £65,000-£100,000. Build Over Agreement with Thames Water adds £317 plus CCTV survey where the extension passes over a public sewer. Conservation area applications add £206 planning fee where the property sits within Streatham Common or Streatham Hill. Concrete raft tie-in saves £2,000-£3,000 on groundwork on suitable 1930s sites. Fixed-price contract before any work starts.
- Edwardian terrace or 1930s semi — which is easier to extend in Streatham?
- 1930s semis are typically simpler. Three reasons. First, cavity wall construction means new insulation ties directly into the existing cavity using bonded bead, which is more efficient than internal lining and doesn't lose internal floor area. Second, the wider plots mean side access for materials delivery, foundation pour, and waste removal is easier. Third, only one party wall is shared on a semi versus both sides on a mid-terrace, halving the party wall surveyor cost. Edwardian terraces have a slightly higher labour cost on the wall build-up because of the internal insulation lining and the dual-side party wall mechanics, but the underlying structure (solid 9-inch brick) is solid and predictable. Both deliver the same final result.
- Are Streatham conservation areas restrictive for kitchen extensions?
- Moderately. The Streatham Common conservation area covers properties around the Common itself; the Streatham Hill conservation area covers parts of the upper hill streets. Within both, exterior front-facing changes need sympathetic design — front door style, window replacement, render colour, dormers — and Lambeth Council can act on retrospective unauthorised changes. Rear extensions are generally fine because they're not visible from the street. Article 4 directions on some streets near the conservation area boundaries remove specific permitted development rights and require the £206 full planning application. We verify the planning status of each property on the Lambeth planning portal at the survey before quoting.
- Why hire All Well for a Streatham kitchen extension?
- Three reasons. First, accuracy: we know the SW16 stock — Edwardian solid-wall versus 1930s cavity-wall construction, conservation area boundaries, where Article 4 directions apply, and which 1930s semis sit on concrete raft foundations. Second, full accreditation: NICEIC for electrical (BS 7671), FENSA for glazing, Gas Safe registered for boiler relocation, structural engineer calculations included, and Building Control sign-off included on every project. Third, fixed-price contracts: the quote doesn't change unless the specification does, including Build Over Agreement, party wall surveyor fees, conservation area applications, and any Article 4 full planning. 57 verified Google reviews averaging 4.5/5. Office on Limes Avenue, SE20.
Kitchen Extensions Near Streatham
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