House Extensions in Sydenham
Sydenham is one of South East London's most underrated residential areas. Strong transport links via Sydenham and Lower Sydenham stations, proximity to Dulwich, Forest Hill, and Crystal Palace, and a large stock of Victorian and Edwardian family homes make it a strong area for property improvement. RCB Design & Build delivers loft conversions, rear extensions, and full refurbishments across SE26.
House Extensions in Sydenham — what to expect
Sydenham's Victorian and Edwardian stock offers genuine extension potential. Rear extensions at ground floor — typically 3–6m under permitted development — create the open-plan kitchen-dining space that buyers and tenants now expect. Substantial semi-detached properties in the elevated streets south of the town centre can accommodate double-storey extensions on the rear. Side return extensions are common on Victorian terraces where the side passage runs alongside the kitchen.
Sydenham property types
Victorian and Edwardian terraces, inter-war semis and detached homes, some newer developments. The property type affects which extensions approach works best — we'll advise from the first call.
Common extensions projects we deliver in Sydenham
How we deliver extensions in Sydenham
Free consultation & survey
We visit your Sydenham property, assess what's possible, and give you a fixed-price indication before you commit to anything. No obligation.
Design & planning support
We work alongside your architect or our preferred design partners to develop drawings that are buildable, compliant, and cost-effective. We flag planning and permitted development options early.
Fixed-price contract
You receive a detailed, itemised scope of works and a fixed price before we start. No surprises mid-project. Variations are agreed in writing before any additional work begins.
Managed delivery
We manage all trades, procurement, and site logistics. You have a single point of contact throughout. Our site teams are familiar with Sydenham and the local planning and building control requirements.
Sign-off & warranty
We complete to building regulations standard and obtain all relevant sign-off. Your structural warranty covers up to 25 years.
Planning in Sydenham
Sydenham falls under Lewisham Council. Most residential streets in SE26 have standard permitted development rights for extensions and rear dormers. Conservation areas are limited in this part of the borough, but tree preservation orders are common on the more established residential roads. We confirm planning position at pre-construction as standard.
Why choose RCB Design & Build in Sydenham?
Local knowledge
We work in Sydenham regularly. We know the planning authority, local building control, and the typical property types and challenges in this area.
Fixed-price guarantee
Your price is fixed before work starts. We absorb material and labour cost movements — not you.
Full principal contractor service
We manage every trade, every supplier, every inspection. You deal with one team from start to finish.
25-year structural warranty
All structural work is covered under our long-term warranty. Proof of quality, in writing.
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Design-and-build capability
We don't just build — we can support design development, planning applications, and pre-construction cost planning.
Other services in Sydenham
Start your Sydenham project
Free consultation. Fixed price. 25-year warranty. One team from first call to final sign-off.
Or call us on 07359 872594