Real cost ranges for London, UK, priced in GBP. Every row is what homeowners actually spend across the scope spectrum — the low end is a pull-and-replace on the existing footprint, the high end is a full custom build with premium finishes.
~1 min readUpdated 18 Apr 2026
Cabinets, counters, appliances, and plumbing/electrical updates drive the range. The top of the band reflects full layout changes and premium finishes; the bottom holds for pull-and-replace scopes on the existing footprint.
Scope yours with Baily in LondonTile, fixtures, and waterproofing are the big drivers. Primary and ensuite bathrooms with walk-in showers or freestanding tubs sit near the top of the band; hall baths come in closer to the bottom.
Scope yours with Baily in LondonDetached units and garage conversions vary most by square footage, foundation type, and utility runs. Where local law does not recognize ADUs, this row maps to the nearest annex / granny-flat / laneway equivalent.
Scope yours with Baily in LondonWhole-home scope covers all trades plus permitting, structural, MEP, and finishes. Historic properties, listed buildings, and seismic-retrofit markets sit well above the median.
Scope yours with Baily in LondonMaterial choice (asphalt shingle, tile, standing-seam metal, membrane) dominates the range. Pitch, access, and city-specific wind/fire codes add the rest.
Scope yours with Baily in LondonComposite decking, hardwood, pavers, and concrete slab are the main price bands. Elevated decks and outdoor-kitchen integrations push the high end.
Scope yours with Baily in LondonFraming, insulation, egress windows, and waterproofing move together. Adding a bathroom or full kitchen pushes the cost well above the base finish scope.
Scope yours with Baily in LondonGunite, vinyl-liner, and fiberglass each have distinct price bands. Spa integration, water features, and decking lift the top of the range.
Scope yours with Baily in LondonPrep work (siding repair, pressure wash, priming) is the hidden driver. Coastal and high-UV markets use specialty coatings that cost more but last longer.
Scope yours with Baily in LondonHardwood, LVP, tile, and stone span a wide range. Subfloor repair and leveling for old construction add meaningful cost on top of the finish material.
Scope yours with Baily in LondonAsk Baily about your London renovation and you will not be passed around. London is the home market we built AskBaily for outside the United States because the capital's housing stock, planning framework, and builder economy punish the scattershot approach that sites like MyBuilder, Rated People and Checkatrade still use. A Victorian terrace in Islington, a Grade II listed townhouse in Chelsea and a post-war conversion in Battersea all need different specialisms, different consent pathways, and different relationships with the borough council. Baily holds that context and introduces one vetted London builder who fits your property and your scope. No dozen phone calls from strangers. No re-explaining your kitchen drawings to a new tradesperson every other day. One professional who has already seen a hundred kitchens very like yours, who understands what the local planning officer will push back on, and who will see the project through to completion. That is the whole premise, and in London it matters more than anywhere else we operate.
Read the full London guideCost ranges are only half the picture. See how one-builder scoping compares to a bid fan-out before you talk to either.
Tell Baily what you are planning. You will get one vetted local builder, not a pool of strangers. No lead auction, no resold contact details.
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