Home Extension Builders in Sydenham
Sydenham SE26 extensions from a modest rear addition to a full wrap-around and loft combination, with Buildaway costing the whole job clearly up front.
Your Local Home Extension
Specialists in Sydenham
Looking for home extension builders in Sydenham (SE26)? Buildaway extends homes
throughout SE26 - the terraces off Kirkdale and Sydenham High Street, the houses
near Mayow Park, Home Park and Sydenham Wells Park, and the streets toward Lower
Sydenham, Forest Hill and Crystal Palace.
Sydenham extensions run from a modest rear addition to a full wrap-around and loft
combination, with Buildaway costing the whole job clearly up front. SE26's sloping
plots make levels, retaining and drainage decisive, and a wrap-around here often
works better than owners expect. Buildaway's Sydenham extension team surveys the
ground, agrees the planning route and serves the notices, then builds from
foundation to finish on one contract.
Our Home Extension Packages in Sydenham
Single-Storey Rear Extension
Ideal for expanding your living space. Includes structural survey, architectural drawings, groundworks and foundations, brickwork and roofing, bi-fold or sliding doors, heating installation, building regulation approval.
Side Return Extension (Most Popular)
Complete kitchen and living area transformation. Includes structural assessment, full groundworks, steelwork if required, brickwork and matching materials, glazing and doors, full insulation, electrics upgrade, flooring, building regulation approval, waste removal.
Double-Storey Extension
For those seeking maximum space addition. Includes architectural design, full structural alterations, steelwork and foundations, bespoke staircase, multiple room creation, bathroom or en-suite option, planning and building regulation handling.
Why Sydenham Homeowners Choose Buildaway
Specialist installation teams experienced with SE26 and south London properties
Based in your area with local expertise and reputation.
Bespoke extension designs for Victorian terraces, semis, and inter-war homes
We handle everything so you don't have to worry.
Transparent and honest pricing with no hidden fees or unexpected charges.
Clear upfront pricing with no surprises along the way.
Discreet, stress-free project management with minimal disruption
Meticulous craftsmanship in every aspect of your extension.
Reputation built working across Sydenham Hill, Mayow Park, and Bell Green
Professional consultation and detailed quotes at no cost.
What's Included in Your Home Extensions Services
Everything you need for a seamless, stress-free home extension from structure to finish.
Full groundworks and structural build
Complete groundwork preparation and structural construction services.
Plumbing, electrics, and heating integration
Professional installation of all mechanical and electrical systems.
Roofing, windows, and external finish
Complete roofing, window installation and exterior finishing.
Plastering, flooring, and decorating
Professional plastering, flooring and decorating services.
Interior fit-out and finishing
Complete interior fit-out and professional finishing touches.
Project management and schedule control
Professional project management and timeline control throughout.
Latest Home Extension Insights
We publish detailed home extension guides and cost insights for homeowners across Sydenham and surrounding areas, helping customers plan projects with clarity before starting work.
Home Extension Cost in Sydenham
A local cost guide written specifically for Sydenham homeowners, with real figures for the area.
Home Extensions London: The Complete 2026 Guide
Everything from feasibility and planning to structure, cost and programme for a London extension.
Single-Storey Rear Extension Cost London
A realistic cost breakdown for the most common extension in London, with the variables that move it.
What Our Clients Say
Real reviews from our satisfied customers.
“I received an excellent service from the outset with a very high standard of the completed work. Cormac was very responsive to my wish for a traditional period bathroom and helped me to source the suite, the tiles, the paneling and flooring. The team are respectful to the home generally. I am very pleased with the finished bathroom…”
Philomena Mulcahy
“The team turned up when they said they would and kept the house tidy each day, which made a big difference while we were living in the property during the works. The quality of the finish is excellent. The bathroom looks fantastic and the bedrooms feel completely refreshed. We wouldn’t hesitate to recommend Cormac and the Buildaway team…”
Helen Sivyer
“They were also very professional day to day - always tidy, and cleaned up really thoroughly when taking away all rubbish at the end. They stuck to the agreed timelines, and pricing was transparent throughout, with clear communication on any issues as they arose. Overall, I’m really pleased with the result and felt I could trust them throughout. I wouldn’t hesitate to recommend them…”
Sean Kelleher
“Greg's attention to detail and dedication elevated both the experience and the result - he certainly knows his way around a tile. In addition to the bathroom refit, Cormac replaced all the plastic switches, sockets and pull-cords in the house with brushed brass. Highly recommended and will certainly work with the Buildaway team again…”
Kane Dempsey
“I was recommended Buildaway by a colleague as I was impressed by the work they had done for my colleague. From the moment I contacted Cormac, I knew I was in good hands. He was incredibly friendly and accommodating right from the start. The very next day, he was at my property, taking measurements and discussing design options. What really impressed me was Cormac's honesty…”
Nana A.
“We’ve had a genuinely fantastic experience with Buildaway. Cormac was ultra responsive and excellent at communicating with us throughout our project. The quality of the work was excellent - so much so, that we extended our project by adding a range of other building renovations to our original ask, each completed with care and precision…”
Kiran Collier
Frequently Asked Questions
Your questions about home extensions in Sydenham, answered.
How much does a home extension cost in Sydenham?
Extension costs in Sydenham are driven by groundwork, structure and glazing more than floor area alone. Across SE26, expect about £2,400–£3,200 for a single-storey rear, £3,200–£4,400 for wrap-around, £60,000–£80,000 for double-storey. Buildaway itemises groundwork, steels, services and finishes separately so the trade-offs are visible.
How long does a home extension take in Sydenham?
Most Buildaway extensions around Kirkdale and Mayow Park take 12–20 weeks once on site - groundwork, structure, envelope, then services and finishes. Weather affects the early stages more than the late ones. We give Sydenham clients a dated programme with the quote, including the consent lead-in.
Do I need planning permission for an extension in Sydenham?
It depends on your SE26 property. Permitted development covers a good number of Sydenham rear extensions, but if you are listed, in a conservation area, or leasehold, the answer changes and Lewisham Council consent is needed. Buildaway confirms what is achievable at feasibility rather than designing something that gets refused.
What types of extension do you offer in Sydenham?
All the usual types: single-storey rear, side-return, wrap-around, double-storey and basement work. In Sydenham the choice is set by the plot and the planning position, not preference. Buildaway measures the SE26 site and boundary first, then advises honestly on what is achievable.
Do Buildaway handle both design and construction for Sydenham extensions?
Both, on one contract. For Sydenham clients Buildaway handles drawings, structural engineering, consents and construction. Splitting design from build is where SE26 extension projects most often lose money, because the gap between them is nobody's problem until it is yours.
Are your extension specialists local to Sydenham?
We are in Sydenham constantly. Buildaway knows SE26 property: the boundaries, the ground conditions, and how Lewisham Council treats rear additions here. That experience makes our feasibility advice reliable rather than optimistic.
Get Your Free Quote
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We Serve Sydenham and Surrounding Areas
Find us in the heart of Sydenham. We are proud to serve our local community.
Nearby Areas We Serve
Below are some of the local areas where you can find Buildaway transforming homes.
Ready to Transform Your Extension in Sydenham?
We've transformed extensions in Victorian terraces, Edwardian semis, and large family homes throughout Sydenham always delivering results built to last.