Lewisham · London
Kitchen Extension in Lewisham
Victorian terraces and semis — strong loft conversion and rear extension demand.
Lewisham
Kitchen Extension specialists across Lewisham.
We deliver kitchen extension projects across the full Lewisham postcode set — SE4, SE6, SE8, SE12, SE13, SE14, SE23, SE26. Victorian terraces and semis — strong loft conversion and rear extension demand.
A kitchen extension combines a structural extension — side return, rear or wraparound — with a complete kitchen design and installation as a single fixed-price project. It's the most common instruction we receive across London: a homeowner who wants an open-plan kitchen-diner with garden views but doesn't want to manage a builder and a kitchen supplier separately. We handle design, consent, structural build, kitchen supply and installation start to finish. One contract, one project manager, one fixed price.
Every Lewisham project includes a free desk-based planning assessment before we quote. We know the local planning officers, party wall surveyors and approved inspectors by name.
Costs
Kitchen Extension cost in Lewisham 2026.
| Configuration | Cost range | Timeline |
|---|---|---|
| Side return extension + kitchen (3m wide) | £65,000–£90,000 | 10–13 wks |
| Rear extension + kitchen (3–4m deep) | £75,000–£105,000 | 11–14 wks |
| Rear extension + kitchen (5–6m deep) | £90,000–£120,000 | 12–15 wks |
| Wraparound + premium kitchen | £110,000–£130,000 | 14–16 wks |
Local advantage
Eight years of kitchen extension work in Lewisham.
Familiarity with Lewisham's planning officers, party wall surveyors and approved inspectors cuts weeks off the approval timeline. We deliver consistent quality across all 8 postcodes the borough covers.
Recent Lewisham work
Kitchen Extension examples.
Builderr vs other London builders.
The construction industry has a wide distribution of operators. Here's what changes between a directly-employed, fixed-scope outfit and the alternatives.
| Criterion | Builderr | Typical London builder | Cowboy outfit |
|---|---|---|---|
| Labour model | Directly employed team (PAYE) | Mixed subcontract gangs | Day-rate cash labour |
| Pricing | Fixed-scope itemised quote | Estimate + provisional sums | Verbal price + variations |
| Design & engineering | In-house architect + SE | Outsourced, separate billing | Builder draws on the back of an envelope |
| Planning + LDC handled | Yes — included in price | Often charged extra | Builder asks you to apply |
| Party wall surveyors | Instructed by us | Your responsibility | Skipped (illegal) |
| Building control | Plans + site inspections booked by us | Building Notice route | Not registered |
| Project management | Dedicated PM, weekly photo updates | Foreman doubles up | Owner-manager juggles 5 jobs |
| Payment schedule | Stage payments against signed-off milestones | Weekly invoices | Cash up front |
| Insurance | £10M PL + 10yr structural warranty | £2–5M PL only | No documented cover |
| Snags at handover | <3 typical | 20–30 typical | Walk-off mid-job common |
| Variation creep | 0% — fixed scope | +15–25% over original quote | +40%+ regularly |
Save £19,500–£43,875 on a kitchen extension in Lewisham.
Industry data (FMB, RICS, Which? Trusted Trader 2024) shows the average London construction project overruns by 18–22% on cost and 25–35% on time. Fixed-scope contracts with a single accountable team eliminate that variance. The savings above assume a typical project at £97,500.
FAQ
Kitchen Extension in Lewisham.
How much does a kitchen extension cost in Lewisham?+
Kitchen Extension projects in Lewisham typically cost £65,000–£130,000. Lewisham sits across postcodes SE4, SE6, SE8, SE12; local rates align with the wider London market.
Do kitchen extensions in Lewisham need planning permission?+
Victorian terraces and semis — strong loft conversion and rear extension demand. We carry out a free desk-based planning assessment for your specific address before quoting, identifying whether permitted development, prior approval, or full planning applies.
Do you work across all Lewisham postcodes?+
Yes — we deliver kitchen extension projects across all Lewisham postcodes including SE4, SE6, SE8, SE12, SE13, SE14, SE23, SE26.
How much does a kitchen extension cost in London 2026?+
A kitchen extension combining structural build and kitchen fit-out typically costs £65,000–£130,000 in London. A side return + standard kitchen runs £65–90k; a rear extension + premium kitchen + premium glazing sits at £100–130k+.
Do I need planning permission for a kitchen extension?+
Most single-storey kitchen extensions fall under permitted development (up to 3m deep) or the Larger Home Extension scheme (up to 6m). Conservation areas and Article 4 zones need full planning. We assess your specific address on every quote.
Get a Lewisham kitchen extension quote.
Senior consultant call within one business hour. Fixed-scope quote for your Lewisham project — no provisional sums.
Other types in Lewisham
Explore other build types in Lewisham.
Kitchen Extension across London