House Extensions in Streatham
RCB Design & Build | A2Z Principal Contractors works across Streatham, Streatham Hill, Streatham Common, and the SW16 postcode area, delivering loft conversions, rear extensions, full house refurbishments, and structural alteration works for homeowners investing in one of south London's most substantial residential communities. Streatham has a wide and varied housing stock — Victorian terraces and Edwardian semis in the streets between Streatham High Road and Tooting Bec, larger Edwardian villas
House Extensions in Streatham — what to expect
Single-storey and double-storey rear extensions are popular across SW16. We manage planning, structural work, drainage, and decoration as a single coordinated package.
Streatham property types
across SW16 means there is strong demand across multiple project types, from single rear dormer conversions through to full design-and-build packages. The property type affects which extensions approach works best — we'll advise from the first call.
Common extensions projects we deliver in Streatham
How we deliver extensions in Streatham
Free consultation & survey
We visit your Streatham 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 Streatham 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 Streatham
**Full house refurbishments.** We manage comprehensive whole-house refurbishments for Streatham homeowners — structural alterations, rewiring, new heating systems, kitchens, bathrooms, flooring, and decoration in a properly sequenced programme. **Structural alterations.** Through-room configuration
Why choose RCB Design & Build in Streatham?
Local knowledge
We work in Streatham 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 Streatham
Start your Streatham project
Free consultation. Fixed price. 25-year warranty. One team from first call to final sign-off.
Or call us on 07359 872594