Wrap-around extensions combine a side return and a rear extension into one footprint — the highest-impact way to remodel the back half of a Barking & Dagenham terraced or semi-detached home. RCB Design & Build delivers wrap-around extension projects right across Barking & Dagenham (IG11) from our Dartford base — typically on site within 48 hours of enquiry, with a fixed written quotation in 5 working days. Our typical wrap-around extension project in Barking & Dagenham costs between £57,000 and £152,000 in 2026, with most ex-LCC cottage estates and new-build infill landing around £104,500. We are FMB, TrustMark, Checkatrade and TrustATrader accredited and operate as a Principal Contractor under CDM 2015.
A lot of side-extension and loft-conversion work on inter-war semis. Tight kerbs make skip and scaffold logistics critical. Working out of London Borough of Barking & Dagenham's area, we know the planners, the local building inspectors, and the named conservation officers — that personal relationship cuts weeks off the consenting timeline. Our typical Barking & Dagenham project is on ex-LCC cottage estates within easy reach of Becontree Estate or Barking Riverside, and we work with a small panel of trusted London-area subcontractors we have used for years.
What's included in our wrap-around extension price
Foundations, brick build-up on side and rear elevations, two or three steel beams, flat-roof to side with pitched/lantern detail to rear, structural glazing or sliding doors, first-fix M&E, plaster and screed. Existing back wall typically demolished. Our written quotation covers labour, first-fix materials, project management, scaffolding, skips, Building Control fees and statutory inspections. Second-fix materials (kitchens, bathrooms, flooring, tiles, paint, sanitaryware) are supplied by the client as a deliberate cost-control measure — this typically saves homeowners £8,360–£15,675 in trade markup. We exclude planning fees, party-wall surveyor fees and structural engineer drawings, which we coordinate at cost.
Barking & Dagenham planning, party walls and Building Regs
Becontree Estate has area-wide design guidance — match brick and roof line. A wrap-around demands rigorous thermal-bridge detailing where the new roof meets two flank walls and the existing building. Get the cold-bridge and DPC strategy right or you will get condensation. Outside conservation areas, Barking & Dagenham generally permits the typical PD scope. Party Wall Awards are typically needed for any excavation within 3 metres of a shared wall — we coordinate the surveyor and serve notices. Building Control is lodged at the start, with inspections at foundation, damp-course, pre-plaster and completion stages.
Timeline and process for Barking & Dagenham projects
Wrap-arounds run 12–18 weeks on site. Pre-construction is heavy: full planning, party wall awards on both flanks, structural calcs and Building Control submission. We hold a weekly call with the client throughout, send a written progress report with photos every Friday, and the lead PM is always reachable on WhatsApp. From IG11 postcodes we can have someone on site within 48 hours of a phone call.
Guarantees and after-care
Every project we deliver in Barking & Dagenham is backed by a 12-month workmanship guarantee. Where we install manufacturer-warranted systems (roofing membranes, windows, MVHR), the manufacturer warranty (typically 10–25 years) runs alongside. As an FMB member we can also arrange an FMB-backed 2-year insurance warranty on qualifying Barking & Dagenham schemes — worth considering for any project above £50,000.
Indicative Barking & Dagenham (IG11) ranges for 2026. A site visit firms the figure to +/-5%.
Frequently asked questions
How much does a wrap-around extension cost in Barking & Dagenham in 2026?
Typical Barking & Dagenham pricing ranges from £57,000 to £152,000 depending on size, finish and site complexity. Barking & Dagenham typically sits below central-London rates — useful for budget discipline on larger schemes. A free site visit firms the number up to ±5%.
How long will a wrap-around extension take in Barking & Dagenham?
Allow 6–12 weeks of design, planning and procurement before work starts, then a project-dependent build phase. Wrap-arounds run 12–18 weeks on site. Pre-construction is heavy: full planning, party wall awards on both flanks, structural calcs and Building Control submission. We share a Gantt-style schedule with every quotation.
Can I do a wrap-around under permitted development in Barking & Dagenham?
Rarely — the side element typically exceeds half the width of the original house, which knocks you out of PD. Full planning is the realistic default.
Which areas of Barking & Dagenham do you cover?
We cover all of IG11 and the surrounding London postcodes from our Dartford base. Recent projects sit close to Becontree Estate and Barking Riverside. Anywhere within 45 minutes of Dartford is comfortably inside our core delivery zone.
Is RCB insured?
Yes — we hold £5 million Public Liability, £10 million Employer's Liability, full Contract Works insurance and Professional Indemnity. Certificates are provided with every quotation.
How do I get a quote?
Use the free instant calculator at /quote for a 60-second ballpark, configure your project in detail at /configure, or call +44 7359 872594. We respond to every enquiry within 4 working hours.