Edwardian broken-plan kitchen renovation — Plain English in-frame + Calacatta island

Brief

1908 Edwardian semi on a quiet Twickenham street, TW1 — owner-occupier family of four. Existing kitchen was a 2008 dated MFI-era fit-out in a cramped rear-addition cellular plan: kitchen + dining + utility split across three small rooms, dark, narrow circulation, single-glazed timber casements to the rear. Brief: keep the rear addition as the kitchen zone, knock through the load-bearing wall between kitchen and rear-reception to make a broken-plan kitchen + family-room (Crittall screen to keep zoning + acoustics), restore the original Edwardian features (pitch-pine floor, picture rails, ceiling rose), and deliver a Plain English in-frame kitchen with a Calacatta Viola marble island as the centrepiece.

Challenge

Three issues. (1) Structural — the wall between the kitchen and rear-reception was load-bearing supporting the bedroom-floor joists + chimney breast above; spanned 4.2m. (2) Heritage — Twickenham Riverside Conservation Area sits 180m to the east, but the property itself is just outside the boundary; the family wanted to retain every original feature including 1908 pitch-pine floorboards, picture rails, ceiling rose and the original cast-iron fireplace in the rear-reception. (3) Floor build-up — original pitch-pine over joists 22mm thick + wet UFH retrofit meant low-profile system (Wunda 16mm) to keep floor level continuous from front-reception through the new broken-plan zone.

Solution

Pre-app not required (outside CA boundary). Building Notice route via Richmond Building Control (no full plans application). Structural engineer (Webb Yates Engineers) £1,650 for two 254×146×31 UB steels with 200×200×10 SHS goalpost + 50mm intumescent paint. Party Wall: single-party Party Wall Award with attached neighbour, surveyor Peter Barry £2,400, schedule of condition. Build phase 11 weeks. Weeks 1–3 strip-out + structural opening + chimney-breast retention + temporary props + steel insertion + reinstatement. Original 1908 pitch-pine floorboards lifted carefully, numbered, set aside in a sealed pallet for re-laying. Original cast-iron fireplace retained in situ + scaffolded for protection. Weeks 4–6 first fix + Wunda low-profile UFH 16mm laid over insulated subfloor + manifold in utility cupboard + pitch-pine boards re-planed and re-laid over UFH. Replacement timber casements to rear (Mumford & Wood double-glazed, slim sightline matching original) U-value 1.4 W/m²K. Crittall-style internal screen (true Crittall W20 single-glazed 4-pane, powder-coated black, 2.4m × 2.6m) installed in the structural opening between kitchen and family-room — slim 25mm sightline, opens with a single 0.9m pivot door. Weeks 7–10 Plain English Spitalfields range kitchen installed: in-frame muted-green base + bone-white wall units, brass cup handles, oak interior carcasses, Calacatta Viola marble island 3.4m × 1.2m with 60mm mitred edge and waterfall ends, Wolf M-Series double oven + induction hob, Sub-Zero 46-bottle wine column + Wolf coffee in walk-in pantry, Quooker Fusion Pro3 boiling tap, Shaws of Darwen 800mm Belfast sink. Walk-in pantry 2.1m × 1.4m with bespoke Plain English shelving + integrated bin store + bulk dry-goods drawers. Heritage restoration: picture rails replicated where missing, ceiling rose retained, cast-iron fireplace polished and refurbished. Week 11 commissioning + Building Control final + handover.

Outcome

Building Control final certificate issued week 11. Project completed Q1 2026, two days inside programme. Floor area unchanged but functional kitchen footprint expanded from 14m² cellular to 36m² broken-plan kitchen + family-room with Crittall zoning. Resale agent (Antony Roberts Twickenham) valued the uplift at £215,000 against £142,000 spend = 151% gross ROI. Project featured in House & Garden Kitchens Issue April 2026 and Plain English customer story Q2 2026. Builderr first Plain English in-frame project + first Wunda low-profile UFH retrofit under restored original timber floor + first Crittall W20 true-Crittall internal screen install. Richmond upon Thames 3rd portfolio case study + Twickenham first.