House Extensions in Sidcup
Sidcup is one of outer South-East London's most consistently popular family suburbs, combining good transport connections — the Sidcup line into London Bridge and Charing Cross — with a residential character built primarily around inter-war semi-detached housing that remains affordable relative to inner London equivalents. The DA14 and DA15 postcodes are dominated by 1930s and 1950s semi-detached and detached homes sitting on reasonable plots, owned predominantly by families who are choosing to
House Extensions in Sidcup — what to expect
RCB delivers rear extensions, side returns, and double-storey extensions across Sidcup.
Sidcup 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 Sidcup
How we deliver extensions in Sidcup
Free consultation & survey
We visit your Sidcup 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 Sidcup 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 Sidcup
Standard rear extensions and loft conversions often fall within permitted development for DA14/DA15 residential streets, though we always verify on a property-by-property basis
Why choose RCB Design & Build in Sidcup?
Local knowledge
We work in Sidcup 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 Sidcup
Start your Sidcup project
Free consultation. Fixed price. 25-year warranty. One team from first call to final sign-off.
Or call us on 07359 872594