House Extensions in Balham
RCB Design & Build | A2Z Principal Contractors works across Balham, Bedford Hill, and the SW12 postcode area, delivering loft conversions, rear extensions, full house refurbishments, and structural alteration works for homeowners in one of south London's most consistently popular residential neighbourhoods. Balham's popularity is well established, and it attracts an owner-occupier base that typically has high expectations for quality and finish. The Victorian and Edwardian terraced and semi-deta
House Extensions in Balham — what to expect
Ground-floor rear extensions — typically kitchen-dining spaces or family rooms — are popular upgrades across Balham. We manage planning, structural work, drainage, glazing, and decoration.
Balham property types
Period and interwar houses. The property type affects which extensions approach works best — we'll advise from the first call.
Common extensions projects we deliver in Balham
How we deliver extensions in Balham
Free consultation & survey
We visit your Balham 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 Balham 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 Balham
**Full house refurbishments.** We manage complete whole-house refurbishments for Balham homeowners — structural alterations, M&E upgrades, kitchens, bathrooms, flooring, and decoration managed as a single programme. **Kitchen extensions.** A kitchen extension is often the single highest-value impro
Why choose RCB Design & Build in Balham?
Local knowledge
We work in Balham 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 Balham
Start your Balham project
Free consultation. Fixed price. 25-year warranty. One team from first call to final sign-off.
Or call us on 07359 872594