House Extensions in Eltham
Eltham is one of South East London's most active extension markets — its interwar and post-war semi-detached stock, with generous plot widths, is ideal for side extensions, loft conversions and full-footprint rear additions.
House Extensions in Eltham — what to expect
SE9 interwar semis are the ideal extension candidate. Wide side passages allow for single or double-storey side extensions. Rear extensions of 3–6m are standard. Some of the larger detached plots in Eltham allow wraparound extensions. The Elizabeth line at Eltham station has added momentum to renovation activity.
Eltham property types
Interwar semi-detached and detached, bungalows, 1960s–80s estates. The property type affects which extensions approach works best — we'll advise from the first call.
Common extensions projects we deliver in Eltham
How we deliver extensions in Eltham
Free consultation & survey
We visit your Eltham 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 Eltham 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 Eltham
SE9 falls within the Royal Borough of Greenwich. Conservation areas apply around Eltham High Street and Eltham Palace. Verify PD status with RBG Planning, particularly on any property near the Palace or in the conservation zone.
Why choose RCB Design & Build in Eltham?
Local knowledge
We work in Eltham 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 Eltham
Start your Eltham project
Free consultation. Fixed price. 25-year warranty. One team from first call to final sign-off.
Or call us on 07359 872594