Kitchen Extension Builders in Sydenham (SE26)
Professional kitchen extension builders in Sydenham, South East London.
Why Choose All Well for Kitchen Extensions in Sydenham?
Sydenham's Victorian villas have some of the largest rear gardens in South East London, which means kitchen extensions here can be genuinely ambitious. 5-6 metre rear extensions with full-width glazing that open onto terraced gardens. The hillside setting means many properties have elevated rear aspects with beautiful views south over the trees, making the extension the best room in the house. We design the glazing layout to make the most of whatever view your property has.
Every project comes with a fixed-price contract, single project manager, and full certification including Building Control sign-off.
Kitchen Extensions for Sydenham Properties
Sydenham is known for its victorian villas, edwardian terraces, hillside properties. Our kitchen extensions services are tailored to these property types, ensuring results that complement the character of your home.
Postcodes we cover: SE26
Kitchen Extensions Tip for Sydenham Homeowners
The hillside topography in Sydenham creates interesting foundation challenges. Properties on the slope often need stepped foundations that follow the garden gradient, which is standard practice here. Some of the steeper gardens need retaining walls at the point where the extension meets the existing ground level. We work this out from the actual site conditions. A flat-site assessment from a builder who hasn't visited won't be accurate for most Sydenham properties.
Kitchen extension types we build in SE26
Three patterns cover most of what we build in Sydenham. The Victorian villas and Edwardian terraces here each lend themselves to a different approach, and the hillside topography adds a third variant you won't see in flatter SE postcodes.
Deep rear extensions on Victorian villas along Westwood Hill and Kirkdale
The large villas along Sydenham Road, Westwood Hill, Kirkdale, and the streets towards Sydenham Hill Wood typically have generous rear elevations and substantial gardens of 18-30 metres depth. We extend 5-6 metres into the garden, take out the load-bearing wall between kitchen and dining room with a 203x133 UB or 254x146 UB steel beam (depending on span and load), and finish with full-width sliders or bifolds opening onto a terraced patio. Build time 12-16 weeks. The 5-6 metre projection typically goes through the Larger Home Extension prior approval process under Class A. Wraparound extensions are the second pattern, common on the streets around Sydenham station and the Edwardian terraces near Mayow Park. We combine a side-return infill of 1.0-1.5 metres with a 4-metre rear projection. Build time 14-16 weeks. Party wall agreement with the neighbouring property is required.
Hillside rear extensions with retaining walls on Wells Park Road and Westwood Park
Properties on the upper slopes around Sydenham Hill, Wells Park Road, and Westwood Park have rear gardens that drop noticeably from the house, sometimes 1.0-2.0 metres of fall over the first 4-5 metres. The new extension needs short reinforced concrete retaining walls at the rear and stepped foundations following the gradient. Build time 14-16 weeks. We confirm the design after a free site visit because a flat-site assessment won't be accurate for most Sydenham hillside properties.
Foundation conditions and conservation areas for kitchen extensions in Sydenham
Three site-specific factors shape how we approach foundations and planning here. Getting them wrong at quote stage causes problems later, so we check all three at the survey before anything goes on paper.
Stepped foundations and mixed subsoil across the SE26 slope
The streets running up the Sydenham slope have rear gardens that drop from the house. Standard strip foundations don't work on slopes. We use stepped foundations following the ground profile, or short reinforced concrete retaining walls to create a level base for the new extension floor. The structural engineer specifies the design after a trial hole investigation. Sydenham sits on a transition between London Clay and the gravel-and-sand deposits running across the Sydenham ridge. Foundation depths vary, typically 1.0-1.2 metres on sandy ground, 1.2-1.5 metres on clay, deeper near mature trees on the upper streets. We dig a trial hole at the survey on every project where ground conditions aren't already known. Stepped foundations or retaining walls on the steeper streets are specified to suit the slope and built into the fixed-price contract confirmed after a free site visit.
Sydenham Hill and Jews Walk conservation areas — what they mean for rear extensions
The Sydenham Hill conservation area covers the upper slopes including some of the largest Victorian villas. The smaller Jews Walk conservation area is centred south of Sydenham High Street. Within both, 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. Most Sydenham streets are outside both conservation areas and have full permitted development rights. We check the boundary on the Lewisham planning portal at the survey before quoting.
Lewisham planning and project management for SE26 kitchen extensions
Sydenham falls under London Borough of Lewisham. The planning route depends on the size of the extension and whether the property sits within a conservation area or has an Article 4 direction. We verify both before quoting.
Permitted development, prior approval, and the Lawful Development Certificate at Lewisham
Permitted development under Class A covers a 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. Larger projects need full planning. Lewisham typically determines applications in 8-10 weeks. We submit a Lawful Development Certificate (£129, 6-8 weeks at Lewisham) on permitted development projects for written confirmation, which protects the property at sale time. Lewisham has Article 4 directions in some Sydenham streets that remove specific permitted development rights, mainly affecting front-of-property changes and rarely rear extensions, but we verify the planning status of each property before quoting. A Sydenham kitchen extension involves 13-16 trades over 12-18 weeks: demolition, foundations and any retaining walls, 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. Fixed-price contracts cover labour, materials, structural engineer calculations, Building Control fees at Lewisham, FENSA glazing registration, party wall surveyor coordination, trial hole investigation, conservation area applications where relevant, and the Lawful Development Certificate or planning fee. Building Control inspections happen at foundation, retaining wall, DPC, drainage, structural steel, insulation (Part L: U-value 0.18 W/m²K), and completion. Our office on Limes Avenue is 10 minutes from any SE26 property.
Kitchen Extensions in Sydenham: What's Included
How I price kitchen extensions in Sydenham
I price every kitchen extensions job in Sydenhamafter I’ve seen it. No two properties are the same, so a number here would only mislead you. What you get instead is a fixed-price contract, a week-by-week programme, and no costs that turn up later.
Get a fixed quoteWhat 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
Sydenham
“Professional team, clear communication throughout. They handled everything including Building Control sign-off.”
Verified Customer
Sydenham
Frequently Asked Questions
- What does a Sydenham kitchen extension involve?
- The signature Sydenham project is a deep rear extension of 5-6 metres on a Victorian villa, including stepped foundations, structural steel, glazing, electrics, plumbing, and finishes. Wraparound extensions on Edwardian terraces combine a side-return infill with a rear projection. Hillside extensions add short reinforced concrete retaining walls where the garden drops away. Larger Home Extension prior approval, for 4-6 metre projections on terraces, adds 8 weeks lead time on top of the £129 Lawful Development Certificate application. Trial hole investigation goes in where ground conditions aren't already known. Fixed-price contract confirmed after a free site visit before any work starts.
- Why do Sydenham hillside extensions differ from flat-site equivalents?
- Two reasons. First, foundations: properties on the slope need stepped foundations following the ground profile or short reinforced concrete retaining walls to create a level base for the extension floor. The structural engineer specifies the design from trial hole data rather than a generic estimate. Second, threshold detail: where the rear garden drops 1.0-2.0 metres below the new extension floor, the patio or decking needs a graduated step-down rather than a flush threshold. Bifolds typically open onto a new patio at an intermediate level rather than directly onto the original garden. Both elements are standard on Sydenham hillside projects and built into the fixed-price contract.
- Are Sydenham conservation areas restrictive for kitchen extensions?
- Only on properties within the boundary. The Sydenham Hill conservation area covers the upper slopes including some of the largest Victorian villas. The smaller Jews Walk conservation area is centred south of Sydenham High Street. Within both, front-facing alterations need sympathetic design. Lewisham can refuse retrospective consent for inappropriate changes. Rear extensions are generally fine because they're not visible from the street. Most Sydenham streets are outside both areas and have full permitted development rights. We check the boundary and any Article 4 direction on the Lewisham planning portal at the survey before quoting any work that affects external elevations.
- Why hire All Well for a Sydenham kitchen extension?
- Three reasons. First, hillside experience: we know the Sydenham slope, which streets need stepped foundations, where retaining walls are required, how to design the threshold detail so the new extension floor sits level with the original kitchen. Second, full accreditation: NICEIC for electrical (BS 7671), FENSA for glazing, Gas Safe registered for boiler relocation, structural engineer calculations included for stepped and retaining-wall designs, and Building Control sign-off included on every project. Third, fixed-price contracts: the quote doesn't change unless the specification does, including stepped foundations, retaining walls, party wall surveyor fees, and any Larger Home Extension prior approval. Office on Limes Avenue, SE20.
All Well has completed 100+ projects across 25 London boroughs since 2020. We are NICEIC approved for electrical work, FENSA registered for glazing, and CHAS certified for site safety, with Public Liability insurance to £5 million. 57+ Google reviews average 4.5 stars. All Well Property Services® is a UK registered trademark, Companies House no. 12721034, operating from Unit 1 Limes Avenue, Anerley SE20 8QR.
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