House Extensions in Mitcham
Mitcham in CR4 offers some of the best extension value in South London — generous plot sizes, affordable entry prices relative to surrounding areas, and good connectivity via tram and road links. RCB Design & Build delivers extensions, loft conversions, and refurbishments across Mitcham and the surrounding CR4 area.
House Extensions in Mitcham — what to expect
Mitcham's mix of Victorian terraces and interwar semis provides solid extension opportunities. Ground floor rear extensions at 4-6m are the most common project type — opening up the rear of the house into a modern open-plan kitchen-diner. The wider plots on interwar semis in Mitcham suit side extensions as well as rear extensions, and the scale of gardens in many CR4 streets allows more generous extension footprints than equivalent inner London properties.
Mitcham property types
Victorian and Edwardian terraced houses, interwar semis and detacheds, some newer build. The property type affects which extensions approach works best — we'll advise from the first call.
Common extensions projects we deliver in Mitcham
How we deliver extensions in Mitcham
Free consultation & survey
We visit your Mitcham 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 Mitcham 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 Mitcham
Mitcham sits within the London Borough of Merton. Most residential streets in CR4 have standard permitted development rights. Parts of the area near Mitcham Common have specific planning considerations. Check your specific address for conservation area status and permitted development restrictions before proceeding.
Why choose RCB Design & Build in Mitcham?
Local knowledge
We work in Mitcham 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 Mitcham
Start your Mitcham project
Free consultation. Fixed price. 25-year warranty. One team from first call to final sign-off.
Or call us on 07359 872594