House Extensions in Deptford
Deptford's SE8 and SE14 postcodes span one of South East London's most culturally dynamic areas — a mix of historic Georgian and Victorian housing, converted riverside warehouses, and a growing number of modern developments. RCB Design & Build works with Deptford homeowners and investors on extensions, loft conversions, and full refurbishments.
House Extensions in Deptford — what to expect
Victorian terraced properties in Deptford respond well to rear ground floor extensions, opening up dark rear kitchens into spacious open-plan family rooms. Many 6m permitted development extensions are achievable without a planning application. We also work on side return extensions and structural opening works to tie new space into the existing footprint.
Deptford property types
Victorian terraces, Georgian houses, converted warehouse and industrial units, modern flats. The property type affects which extensions approach works best — we'll advise from the first call.
Common extensions projects we deliver in Deptford
How we deliver extensions in Deptford
Free consultation & survey
We visit your Deptford 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 Deptford 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 Deptford
Deptford falls under Lewisham Council. Parts of SE14 near New Cross are affected by Lewisham's HMO Article 4 Direction, requiring planning permission for conversions from C3 to C4 use. Check with Lewisham before proceeding with HMO projects.
Why choose RCB Design & Build in Deptford?
Local knowledge
We work in Deptford 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 Deptford
Start your Deptford project
Free consultation. Fixed price. 25-year warranty. One team from first call to final sign-off.
Or call us on 07359 872594