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. rcbGroup delivers loft conversions, rear extensions, and full refurbishments across SE26.
rcbGroup projectHouse 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 extension approach works best — we'll advise from the first call.
Common extension projects we deliver in Sydenham
How we deliver extension projects in Sydenham
Project review & site visit
We look at your Sydenham property and any drawings you have, explain what's possible, the likely planning and Building Regulations route, and the risks — 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.
Itemised scope and price
You receive a detailed, itemised scope of works and an agreed price before we start, with exclusions and provisional sums shown. Variations are agreed in writing before any additional work begins.
Managed delivery
We coordinate trades, procurement and site logistics, with a single point of contact throughout — working to the requirements of London Borough of Lewisham and Building Control.
Sign-off & handover
We coordinate the Building Control inspections needed for sign-off, then hand over your project documents — completion certificate, guarantees and manuals as applicable — with snagging and aftercare as set out in your contract.
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 rcbGroup in Sydenham?
Local context
We plan around London Borough of Lewisham's requirements and the typical property types in Sydenham — victorian and edwardian terraces, inter-war semis and detached homes, some newer developments.
Price agreed before start
Your price is agreed and documented before work starts. Scope, exclusions, and assumptions set out in writing.
One accountable team
Trades, suppliers and inspections coordinated by one team — with CDM Principal Contractor duties taken on where we are appointed to build.
Written project documentation
A written contract before work starts, a Construction Phase Plan where we are appointed to build, and the completion certificate and handover documents gathered for you at the end.
Independently reviewed
Rated 10/10 from 117+ reviews on Checkatrade, where you can read them for yourself.
Support from planning to aftercare
We don't just build — we can support design development, planning applications, and pre-construction cost planning.
Planning an extension in Sydenham?
Pick whatever suits you. We'll look at what you have (drawings, photos or quotes) and tell you honestly what the next step should be.
Prefer to phone? Call +44 7359 872594.
Postcodes served: Sydenham
Not sure if we cover your street? Get in touch — we'll confirm in minutes.
Start your Sydenham project
Project review. Clear scope. Agreed price. One team from first call to Building Control sign-off.
Or call us on +44 7359 872594