Southwark · London
Full Basement Excavation in Southwark
Mix of Georgian terraces and post-war flats — loft and side return work common.
Southwark
Full Basement Excavation specialists across Southwark.
We deliver full basement excavation projects across the full Southwark postcode set — SE1, SE5, SE15, SE16, SE17, SE21, SE22. Mix of Georgian terraces and post-war flats — loft and side return work common.
Full basement excavation creates a new habitable floor below your existing house. The process: excavate 2.5–3m below the existing floor level, underpin the perimeter walls to the new founding depth, install a new structural slab and retaining walls, waterproof to grade 3 (habitable), and fit out as living space — gym, cinema, guest suite, utility, or any combination. Builderr delivers full basement excavations across London in 22–28 weeks at £150,000–£350,000 fixed-scope.
Every Southwark 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
Full Basement Excavation cost in Southwark 2026.
| Configuration | Cost range | Timeline |
|---|---|---|
| Standard 30–40m² basement under terrace, single room | £150,000–£220,000 | 22–26 wks |
| 40–55m² basement under terrace, multi-room layout | £200,000–£280,000 | 24–28 wks |
| Premium 55–70m² basement with light wells | £260,000–£350,000 | 26–32 wks |
| Inner London K&C/Westminster premium spec | £320,000–£480,000 | 28–36 wks |
Local advantage
Eight years of full basement excavation work in Southwark.
Familiarity with Southwark's planning officers, party wall surveyors and approved inspectors cuts weeks off the approval timeline. We deliver consistent quality across all 7 postcodes the borough covers.
Recent Southwark work
Full Basement Excavation 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 £50,000–£112,500 on a full basement excavation in Southwark.
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 £250,000.
FAQ
Full Basement Excavation in Southwark.
How much does a full basement excavation cost in Southwark?+
Full Basement Excavation projects in Southwark typically cost £150,000–£350,000. Southwark sits across postcodes SE1, SE5, SE15, SE16; local rates align with the wider London market.
Do full basement excavations in Southwark need planning permission?+
Mix of Georgian terraces and post-war flats — loft and side return work common. 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 Southwark postcodes?+
Yes — we deliver full basement excavation projects across all Southwark postcodes including SE1, SE5, SE15, SE16, SE17, SE21, SE22.
How much does a full basement excavation cost in London?+
A typical 30–40m² basement under a London terrace costs £150,000–£220,000 in 2025. Larger basements (40–55m²) £200,000–£280,000. Premium fit-outs in zone 1–2 with light wells £260,000–£350,000. K&C and Westminster premium spec can exceed £480,000.
Is a basement worth it on a London house?+
On a zone 1–3 property where a basement creates significant habitable floor area, ROI is typically positive — a £250,000 basement on a £1.5m house typically adds £350,000–£500,000 in value. Outer London ROI is usually negative — the build cost exceeds value uplift in zones 4–6.
Get a Southwark full basement excavation quote.
Senior consultant call within one business hour. Fixed-scope quote for your Southwark project — no provisional sums.
Other types in Southwark
Explore other build types in Southwark.
Full Basement Excavation across London