Victorian side-return + rear kitchen extension — Parsons Green CA
Hammersmith and Fulham · 1889 Parsons Green CA terrace · 14-week build
Brief
1889 Victorian closet-wing terrace in the Parsons Green Conservation Area (designated 1990). Family-of-four owners wanted the textbook H&F kitchen extension: 1.6m side-return infill + 3.8m rear extension creating a 32m² kitchen-dining-snug zone, with a Crittall W20 internal screen separating the kitchen from a small reception snug (broken-plan over open-plan per current trend). Brief specified Plain English Spitalfields kitchen, Calacatta Viola 3.2m island and 4-panel sliding doors to garden. No upstairs work in scope.
Challenge
Parsons Green CA Design Code mandates London stock brick (Petersfield Imperial or York Handmade), natural Welsh or Spanish slate roof, lead-clad parapet detail and slim-frame steel (Crittall W20 or Reynaers SL68) — bulk aluminium routinely refused by H&F conservation officers. Closet-wing party wall structural opening required 178×102 UB tucked into the existing spine wall to preserve the kitchen ceiling cornice line. Existing combined sewer ran 1.2m from the proposed rear-extension foundations — Thames Water Build-Over Agreement required (£900 + 8-week determination). Two Party Wall awards needed (left + right neighbours sharing both the closet-wing wall and the rear flank).
Solution
9-week pre-app + planning phase: H&F conservation pre-app £290 week 1 (confirmed Petersfield Imperial brick match + Westmorland slate + Crittall W20 acceptable); full planning submitted week 3, determined week 9 first-time approval. Party Wall notices served week 4, both awards in hand week 7 via Peter Barry Surveyors. Thames Water BOA application submitted week 4, granted week 11 (parallel with construction kick-off on areas not affected by sewer). 14-week site programme: weeks 1–4 demolition of 1970s outrigger + 14m² side-return groundworks (1.5m piled minipile foundations adjacent existing footings) + closet-wing UB installation with heritage propping; weeks 5–8 brick superstructure in Petersfield Imperial soft-red lime mortar + slate parapet + Reynaers SL68 sliding-door + structural ridge rooflight; weeks 9–14 internal finish — Plain English Spitalfields kitchen + Calacatta Viola 3.2m island + Crittall W20 4-panel internal screen + Quooker + Wolf 90cm + Sub-Zero + Wunda 16mm low-profile UFH + Bert & May Verena encaustic to existing entrance hall + restored 9-inch Victorian-pine floor sand-and-restore.
Outcome
Planning cleared first-time week 9. Site completed week 14, one day inside programme. 32m² kitchen-dining-snug zone delivered with Crittall W20 broken-plan screen as the heritage-sympathetic alternative to open-plan. Petersfield Imperial brick match achieved a near-invisible junction with the original 1889 stock — H&F conservation officer commended the brick sample panel as 'exemplar'. Thames Water BOA cleared week 11; piled minipile foundations satisfied the build-over condition with 600mm clearance to crown. EPC unchanged (extension only) but heating cost reduced ~£420/year via UFH + improved glazing. Resale-equivalent uplift £210k on £148.5k spend = 141% gross ROI for a kitchen-extension-only scope.
Spec
Project specification.
Gallery
Inside the build.
"We wanted the textbook H&F Victorian kitchen extension — 1.6m side return, 3.8m rear, Plain English Spitalfields, Calacatta Viola island, Crittall internal screen for the broken-plan snug. Parsons Green is conservation area and the H&F Design Code is very specific about brick, slate, glazing and parapet details. Builderr handled the pre-app, the brick sample panel (which the conservation officer described as 'exemplar' in the decision letter), the Thames Water Build-Over Agreement (the combined sewer ran 1.2m from our foundations), and both Party Wall awards through Peter Barry. Planning cleared first time at week 9. Site finished week 14, one day early. The Crittall W20 internal screen is the highlight — it gives us broken-plan zoning between the kitchen and the snug without losing sightlines, and it's real Crittall, not aluminium W20-look. £210k uplift on £148.5k. Plain English's studio shoot is in February — we're on the portfolio cover."
— Helena & James K., Parsons Green SW6
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 £29,700–£66,825 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 £148,500.
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