Surbiton side return + sash restoration
Kingston upon Thames · 1898 Victorian end-of-terrace · KT6 · Surbiton CA
Brief
Three-bedroom Victorian end-terrace in Surbiton — side return + rear kitchen-diner with sash restoration to CA specification.
Challenge
Surbiton CA enforces brick, slate roof, sash window detail and rear-extension proportions. End-of-terrace gave generous side-return width (2.4m) but also exposed flank wall to street view. 1898 sashes were original but failing. Build-over Thames Water sewer ran 1.6m from rear elevation.
Solution
Full planning with CA-sensitive design: London-stock brick match, slate-look tiles to lean-to roof, painted timber-framed Crittall-look rear glazing instead of aluminium bifolds to align with CA character. Side-return excavation 4m × 2.4m to existing kitchen footprint. Thames Water build-over agreement obtained — formal application £340 + drainage CCTV £580. 8 original sashes restored (cord, weight, glazing beads, draught-strip). Lime plaster on solid walls. UFH ground floor over insulated screed.
Outcome
Surbiton CA + Kingston planning approved at first submission. L-shape kitchen-diner with island, integrated dining for 8, garden access through Crittall-look French doors. Sash restoration extended originals 30+ years vs replacement that would have failed CA scrutiny. Property valued at £1.18m post-completion (up from £935,000 pre-works).
Spec
Project specification.
Gallery
Inside the build.
"Surbiton CA was the limiting factor and Builderr's CA-sensitive design — Crittall-look instead of aluminium bifolds, slate-look tiles, brick match — sailed through planning first time. The restored sashes are 128 years old and look 5 years old."
— Anna and James Whitaker, Surbiton KT6
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 £29,000–£65,250 on a kitchen extension.
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 £145,000.
Want a build like Kingston upon Thames?
Get a fixed-scope quote with the same direct-labour delivery. Senior consultant call within one business hour.
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