Victorian whole-house renovation — Heaver CA broken-plan
Wandsworth · 1892 Heaver CA terrace · 28-week programme
Brief
1892 Victorian end-terrace in the Heaver Conservation Area (Northcote/Wandsworth Common West Side designation 1990, extended 2008), 4-bed end-of-terrace on a wide plot. Owners — couple with two young children — bought the house off-market needing full bundled renovation: side-return + L-shape loft + complete first/second floor refurbishment + heritage restoration. Wanted broken-plan over open-plan (interior trend shift since 2023) with Crittall W20 internal screen zoning kitchen from snug. Brief restricted to no rear extension (large garden non-negotiable).
Challenge
Heaver CA Article 4 removes most PD rights. Side-return + L-shape loft + new dormer + rear ground-floor restructuring needed full planning with Heaver Conservation Area Appraisal compliance — natural slate, traditional sash detailing, lead-clad dormer cheeks, no aluminium glazing to street-visible elevations. Original cornice in 5 of 7 rooms in salvageable condition under 1980s artex; 2 rooms required full Pavilion Plaster run-in-situ replication. Original marble chimneypiece intact in front drawing room; rear reception missing (Lassco-sourced 1890 Statuary marble replacement). Party Wall awards across 3 neighbours (one absent owner traced through Companies House to BVI vehicle — Land Registry voluntary first registration ordered to identify dispute resolution route). Single-storey rear flat-roof outrigger from 1970s removed and replaced with closet-wing structural opening — UB 178×102 tucked into existing spine wall to preserve cornice line.
Solution
10-week pre-app + planning phase: pre-app £290 with Wandsworth conservation officer week 1, full planning submitted week 4, determined week 10 first-time approval with Heaver Society letter of support. 28-week site programme bundled all four scopes (side-return + L-shape loft + first/second-floor refurbishment + heritage restoration) into a single Party Wall round across 3 neighbours (one BVI owner served via UK service agent following voluntary first registration). Structural-first phase (weeks 1–8: 1970s outrigger demolition, side-return 14m² infill, closet-wing UB installation, L-shape loft steels + dormer + Mansard rear, M&E first fix throughout, sash removal and bench-restoration by Mumford & Wood). Heritage-finishes phase (weeks 9–18: Pavilion Plaster — 5 original cornices retained + 2 new run-in-situ replications, Lassco Statuary marble chimneypiece installation rear reception, Wandsworth-approved Westmorland slate to loft dormer + closet-wing roof, restored original 9-inch Victorian-pine floor 165m² sand-and-restore + 6 boards Crown Reclamation match). Finishes phase (weeks 19–28: Plain English Spitalfields kitchen with Crittall W20 internal screen zoning snug — 'broken-plan' over open-plan per current trend, Calacatta Viola 3.4m island, deVOL Lefroy Brooks family bathroom + Drummonds Spey + Lefroy Brooks Mackintosh ensuite, Edward Bulmer paint, Bert & May Verena encaustic to entrance hall reinstatement, restored original 1892 cast-iron staircase newel and 32 balusters, reinstated picture rail throughout).
Outcome
Planning cleared first-time at week 10 with Heaver Society letter of support. Site completed week 28, on programme. All 4 scopes (side-return + L-shape loft + heritage restoration + full refurbishment) delivered in a single bundled programme — saved estimated 9 months versus phased approach + ~£42k in single Party Wall round + single scaffold lift + consolidated M&E. Plain English Spitalfields + Crittall W20 broken-plan screen recognised in House & Garden Kitchens issue October 2026 + Period Living November 2026 as 'the definitive Wandsworth Victorian broken-plan retrofit'. 14 original sashes restored in situ; cornices fully retained or replicated indistinguishable on close inspection. EPC E (38) → C (73) achieved with sash restoration + Selectaglaze on 2 north-facing bays + 100mm Celotex IWI to flank wall + ASHP 8kW in side return + MVHR loft + 4.2kWp PV. Resale-equivalent uplift £865k on £425k spend = 204% gross ROI — top-decile for Heaver CA renovations. House & Garden 8-page feature October 2026; RIBA London 2026 Conservation finalist; Wandsworth Heritage Awards 2026 winner.
Spec
Project specification.
Gallery
Inside the build.
"We bought a Heaver Conservation Area terrace off-market and needed every workstream — side return, L-shape loft, full first/second floor refurbishment and heritage restoration — bundled into a single programme. Phased work would have meant three separate Party Wall rounds across our three neighbours (one of whom we eventually traced to a BVI shell company via Land Registry voluntary first registration), three scaffold lifts, three M&E first-fixes and 9 extra months. Builderr modelled the bundled option on day one and delivered all four scopes in a single 28-week site programme on a single Party Wall award round. The Plain English Spitalfields kitchen with the Crittall W20 broken-plan screen has been called 'the definitive Wandsworth Victorian broken-plan retrofit' by House & Garden — we still get DMs about the snug. 14 sashes restored in situ with Mumford & Wood, 5 original cornices retained + 2 replicated with Pavilion Plaster, 5 of 6 original chimneypieces restored + 1 sourced from Lassco. EPC E to C without losing original Crown glass on 11 of 14 sashes. £865k uplift on £425k = 204% ROI. Won the Wandsworth Heritage Award. RIBA London Conservation finalist. The bundled programme is the only way to do a Heaver CA renovation properly."
— Camilla & Edward H., Heaver CA SW11
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 £85,000–£191,250 on a victorian whole-house renovation.
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 £425,000.
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