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How Much Does a Self-Build or Renovation Warranty Cost in London?

A 10-year structural warranty for a London renovation or self-build costs £1,800–£8,500. LABC Warranty £1,800–£4,500 for typical residential renovation; NHBC Buildmark Connect £2,500–£6,500; Premier Guarantee £2,200–£5,500; ABC+ £1,800–£4,200. Mortgage lenders require 10-year warranty before issuing lending. Cost scales with rebuild value and complexity.

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01

Providers and cost

LABC Warranty: £1,800–£4,500 typical residential renovation up to £350k rebuild value; competitive through LABC building control. NHBC Buildmark Connect: £2,500–£6,500; premium brand; required by some lenders. Premier Guarantee: £2,200–£5,500; mid-market; widely accepted. ABC+: £1,800–£4,200; competitive; less recognised by specialist lenders. BLP/CRL/Buildzone: £2,200–£5,800. Cost typically 0.8–1.5% of rebuild value (warranty schedule of works value, not contract value).

02

What's covered

Years 1–2: any defect from materials/workmanship — covered by builder under contract or warranty if builder insolvent. Years 3–10: structural defects (foundations, load-bearing walls, roof, structural floors), waterproofing defects (roofs, walls, basement). Not covered: cosmetic finish defects, M&E equipment failures, maintenance, weathering. Single-claim cap: typically 25% of original sum insured. Aggregate cap: 100%.

03

Lender requirements

Mortgage lenders require 10-year warranty for: new build, substantial renovation >£75k or change of use, basement conversion, listed building conversion. Most lenders accept LABC, NHBC, Premier, ABC+. Some specialist lenders only accept NHBC or Premier. BTL mortgages and bridging finance often require warranty. Without warranty: limited mortgage options at completion (2–3 percentage points higher APR). Check lender requirements at application.

04

Application and surveys

Apply at planning consent stage (providers prefer pre-construction registration); pre-construction structural survey £450–£950; site inspections at each construction stage (5–8 visits); pre-handover snagging. Inspectors flag non-compliance for correction. Compliance validates cover. Premium properties >£2M rebuild, basement excavations or complex structural: higher inspection rate and warranty cost.

More questions

Related questions answered.

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Is warranty mandatory for renovation?

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Not by law — but mortgage lenders typically require it for substantial works. Without warranty resale value affected as buyers' lenders demand cover. Recommend for any project >£75k unless paying cash and not intending to sell within 10 years.

PII vs structural warranty?

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PII: held by architect/engineer/contractor — covers design/build errors during project; client benefit only via consultant's own claim against PII. Structural warranty: held by property owner; first-party cover for 10 years on the structure; pays out directly to owner regardless of who caused defect.

Do I need warranty for a kitchen refit?

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Not usually — warranty is for structural and waterproofing work. Cosmetic kitchen refurbishment doesn't need warranty. Kitchen extension adding load-bearing structure: yes, warranty required if mortgaged or selling within 10 years.

Can I get warranty if works started?

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Difficult and expensive — most providers require pre-construction registration. Mid-project warranty: limited providers at 30–80% premium. Register at planning consent stage.

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