Kitchen extensions remain the single most popular renovation in Bexley — typically a 25–35 m² rear or side-return scheme combined with knocking through to the existing reception room. RCB Design & Build delivers kitchen extension projects right across Bexley (DA5) from our Dartford base — typically on site within 48 hours of enquiry, with a fixed written quotation in 5 working days. Our typical kitchen extension project in Bexley costs between £55,000 and £120,000 in 2026, with most detached chalets and 1930s semis landing around £87,500. We are FMB, TrustMark, Checkatrade and TrustATrader accredited and operate as a Principal Contractor under CDM 2015.
Bexley sits in our core delivery area from Dartford. Loft conversions and wrap-arounds on 1930s semis dominate the pipeline. Working out of London Borough of Bexley'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 Bexley project is on detached chalets within easy reach of the A2 or Bexleyheath Broadway, and we work with a small panel of trusted London-area subcontractors we have used for years.
What's included in our kitchen extension price
Foundations, steel beam(s) for knock-through, single-storey extension build-up, structural glazing or aluminium sliding doors, screed, MVHR or trickle ventilation, first-fix M&E. Second-fix kitchen units and worktops are supplied by the client to your chosen designer's spec. 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 £7,000–£13,125 in trade markup. We exclude planning fees, party-wall surveyor fees and structural engineer drawings, which we coordinate at cost.
Bexley planning, party walls and Building Regs
Bexley generally permits larger rear extensions under the Neighbour Consultation Scheme — useful for single-storey extensions. The single biggest decision is glazing — full structural sliding doors, a roof lantern, or a corner glazed bay. Each drives the structural and thermal envelope. Outside conservation areas, Bexley 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 Bexley projects
Kitchen extensions run 10–14 weeks on site, with the kitchen fit happening in the final 2 weeks. We schedule cooker, sink and fridge final positions early to lock the MEP first fix. 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 DA5 postcodes we can have someone on site within 48 hours of a phone call.
Guarantees and after-care
Every project we deliver in Bexley 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 Bexley schemes — worth considering for any project above £50,000.
Kitchen Extension cost in Bexley — 2026 price guide
Project size
From
To
Compact (≤20 m²)
£55,000
£72,000
Standard (20–30 m²)
£66,000
£83,000
Large (30–45 m²)
£77,000
£99,000
XL (45 m²+)
£88,000
£110,000
Indicative Bexley (DA5) ranges for 2026. A site visit firms the figure to +/-5%.
Frequently asked questions
How much does a kitchen extension cost in Bexley in 2026?
Typical Bexley pricing ranges from £55,000 to £120,000 depending on size, finish and site complexity. Bexley sits in the mid-band of our delivery area. A free site visit firms the number up to ±5%.
How long will a kitchen extension take in Bexley?
Allow 6–12 weeks of design, planning and procurement before work starts, then a project-dependent build phase. Kitchen extensions run 10–14 weeks on site, with the kitchen fit happening in the final 2 weeks. We schedule cooker, sink and fridge final positions early to lock the MEP first fix. We share a Gantt-style schedule with every quotation.
What's the realistic budget for a kitchen extension in Bexley?
For the structural build allow £55k–£120k depending on size and finish. Add £20k–£60k for a mid-range to premium kitchen, flooring and appliances supplied separately.
Which areas of Bexley do you cover?
We cover all of DA5 and the surrounding London postcodes from our Dartford base. Recent projects sit close to the A2 and Bexleyheath Broadway. 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.