House Extensions in Forest Hill
Forest Hill has seen significant price growth over the last decade, attracting buyers who invest substantially in extending and renovating the Victorian and Edwardian housing stock throughout SE23.
House Extensions in Forest Hill — what to expect
SE23 properties often have larger plots than inner South London postcodes. Rear extensions of 4–6m are common on the semi-detached stock. Side extensions are viable on detached and end-of-terrace properties. The quality of finish expected in Forest Hill reflects the area's aspirational market.
Forest Hill property types
Victorian and Edwardian semis and terraces, interwar semis, some detached stock. The property type affects which extensions approach works best — we'll advise from the first call.
Common extensions projects we deliver in Forest Hill
How we deliver extensions in Forest Hill
Free consultation & survey
We visit your Forest Hill 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 Forest Hill 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 Forest Hill
SE23 is within the London Borough of Lewisham. Conservation areas exist in parts of Forest Hill. The Horniman Museum area and adjacent streets may have restrictions. Verify with LBL Planning.
Why choose RCB Design & Build in Forest Hill?
Local knowledge
We work in Forest Hill 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.
Checkatrade-verified
Over 100 verified reviews from homeowners across London. Independently verified, not self-reported.
Design-and-build capability
We don't just build — we can support design development, planning applications, and pre-construction cost planning.
Other services in Forest Hill
Start your Forest Hill project
Free consultation. Fixed price. 25-year warranty. One team from first call to final sign-off.
Or call us on 07359 872594