House Extensions in Lee
Lee is a quiet, established South East London neighbourhood in the SE12 postcode — popular with families for its good schools, green spaces around Lee Green and the Manor House Gardens, and mix of Victorian, Edwardian, and inter-war housing. RCB Design & Build delivers loft conversions, extensions, and full refurbishments across SE12.
House Extensions in Lee — what to expect
Lee's housing stock offers good scope for rear extensions. Ground floor rear extensions on Victorian and Edwardian terraces in SE12 open up the typical narrow rear kitchen into open-plan space. Permitted development at 3–6m applies to most residential properties. Side extensions and structural openings frequently accompany extension work, combining into a single contract.
Lee property types
Victorian and Edwardian terraces, inter-war semis, some detached properties. The property type affects which extensions approach works best — we'll advise from the first call.
Common extensions projects we deliver in Lee
How we deliver extensions in Lee
Free consultation & survey
We visit your Lee 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 Lee 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 Lee
Lee falls under Lewisham Council. Most residential streets in SE12 have standard permitted development rights for extensions and loft conversions. Conservation areas exist in parts of the wider SE12 postcode — confirm designation at pre-construction. Manor House Gardens and surrounding streets may have tree preservation orders affecting external works.
Why choose RCB Design & Build in Lee?
Local knowledge
We work in Lee 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 Lee
Start your Lee project
Free consultation. Fixed price. 25-year warranty. One team from first call to final sign-off.
Or call us on 07359 872594