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.
rcbGroup projectHouse 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 extension approach works best — we'll advise from the first call.
Common extension projects we deliver in Forest Hill
How we deliver extension projects in Forest Hill
Project review & site visit
We look at your Forest Hill 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 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 rcbGroup in Forest Hill?
Local context
We plan around London Borough of Lewisham's requirements and the typical property types in Forest Hill — victorian and edwardian semis and terraces, interwar semis, some detached stock.
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 Forest Hill?
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.
Other services in Forest Hill
Postcodes served: Forest Hill
Not sure if we cover your street? Get in touch — we'll confirm in minutes.
Start your Forest Hill project
Project review. Clear scope. Agreed price. One team from first call to Building Control sign-off.
Or call us on +44 7359 872594