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How Much Does a Utility Room Cost in London?

A London utility room typically costs £8,000–£28,000. Converting an existing space (cupboard, hallway recess, garage corner) into a utility room: £8,000–£14,000. Building a new utility as part of a side return or rear extension: £14,000–£22,000. Standalone utility extension or garden building: £22,000–£40,000. Plumbing, drainage routing and ventilation extraction drive cost more than fit-out spec.

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Why utility rooms are a top renovation request

Open-plan kitchens hide nothing — washing machine noise, drying laundry, muddy boots, recycling and pet food bowls all live in the kitchen by default. A utility room solves all five. Typical 4–6 m² is enough for full-height washer+dryer stack, deep Belfast sink with drainer, full-width worktop, broom cupboard, coat hooks, dog station. Larger 8–12 m² accommodates laundry sorting, ironing space and chest freezer. The fastest payback renovation by satisfaction-per-pound.

02

Layout and services

Minimum 1.5m wide for galley layout; 2.2m for L-shaped. Plumbing: cold supply and 32mm drain for washer; 110mm soil for sink if discharging to gravity drainage; condensate drain for heat-pump dryer. Mechanical ventilation 8 L/s minimum (Approved Document F); heat-pump dryers need no external vent. Electrical: 2× double socket for appliances, 2× double socket for worktop, dedicated 16A circuit for laundry, lighting at task level. Underfloor heating only if shared loop with rest of ground floor (not worth standalone for utility alone).

03

Specification and fit-out tiers

Budget tier (£8k–£14k): Howdens carcasses, laminate worktop, ceramic Belfast sink, vinyl floor, Hotpoint integrated appliances. Mid tier (£14k–£22k): Wickes Premier or Wren, quartz worktop, fireclay Belfast, engineered oak floor, Bosch/Siemens integrated. Premium (£22k–£40k): bespoke painted in-frame, marble or solid timber worktop, hand-thrown sink, herringbone tile, Miele/Gaggenau integrated. Always over-spec drainage and ventilation — short cost saving, long-term regret.

More questions

Related questions answered.

Do I need planning permission for a utility room?

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No for internal conversion. Yes if you're extending to create one (unless PD covers your scope). Garage conversion to utility is PD in most cases — verify with an LDC.

Can I fit a utility room without external drainage?

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Yes for the washer (pumped discharge to a soil stack inside) but harder for a Belfast sink (needs gravity drainage). If sink can't reach gravity, use a Saniflo macerator — workable but adds £400–£900 and ongoing maintenance.

What's the smallest viable utility room?

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About 1.5m × 2.5m (3.75 m²) — enough for washer/dryer stack, narrow sink, broom cupboard. Below this, consider a 'laundry cupboard' approach rather than full utility.

Does Builderr build utility rooms?

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Yes — included in extensions, garage conversions and renovations. Full design, plumbing, electrics, joinery and appliances.

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