Double Glazing
in London
Vetted window installers in London. Free quotes for uPVC, aluminium and heritage double glazing. 3 quotes in 24 hours, no obligation.
- Local double glazing specialists in London
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How Much Do Double Glazing Cost in London?
Real prices from completed projects in London and the surrounding area. Costs vary by size, specification and access — use these as a starting guide, then get 3 free quotes for your specific project.
A single supply-and-fit uPVC casement or bay window with A-rated glass. £450–£900 each depending on size and style — the easiest way to budget a partial replacement.
Get quotes for this →A full reglaze of a typical semi — around eight to ten uPVC windows plus a door, FENSA certified. £4,500–£8,500 fitted over one to two days.
Get quotes for this →Slim aluminium frames or timber/heritage sash-style units for period and high-spec homes, with warm-edge spacers and argon fill. £8,000–£18,000 whole-house depending on frames.
Get quotes for this →Costs depend on size, spec and access. The best way to know your exact price is to compare 3 quotes from local specialists.
Get free quotes →London pricing note: Building costs in London are typically 30–40% above the national average, driven by higher labour rates, congestion charges, stricter planning requirements and premium material delivery costs. Inner London boroughs (Zones 1–2) command the highest rates. Prices shown are indicative ranges for London. Always get at least 3 written quotes before committing to any builder.
Double Glazing Specialists Who Know London
Tell us about your double glazing project once and up to three local specialists who cover London get in touch with quotes — free, with no obligation, and you choose who to hire.
Most firms quoting in London also travel to nearby Walthamstow, Wimbledon and Haringey. That matters because it widens the pool of London contractors competing for your job, which usually sharpens the price. London falls in the E, EC, N, NW, SE, SW, W, WC postcode area, covering roughly 3,480,000 households.
It helps to know the regional picture before you budget: Building costs in London are typically 30–40% above the national average, driven by higher labour rates, congestion charges, stricter planning requirements and premium material delivery costs. Inner London boroughs (Zones 1–2) command the highest rates. Three like-for-like quotes will show where your London project lands.
Local facts: London
- Local planning authority: Westminster Council
- Region: London
- Town-centre postcode district: WC2N
- Average house price (Westminster local authority, June 2026): £854,198 (-25.4% year on year) — detached £3,687,075, semi-detached £2,581,399, terraced £1,547,558, flats £758,103
Planning-authority, region and postcode data: ONS Postcode Directory (Open Government Licence). House prices: HM Land Registry UK House Price Index for the local authority (OGL). Member coverage is each member's own registered base and travel radius.
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Double Glazing in London — FAQs
Plan Your double glazing Project in London
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help London homeowners make informed decisions about their double glazing project.
Double Glazing Cost Guide
Detailed UK price ranges, regional adjustments and worked examples for double glazing projects.
Read Double Glazing Cost Guide →All Double Glazing Specialists
Browse our nationwide network of local double glazing contractors covering all 519 UK towns.
Browse Double Glazing Specialists →All Cost Guides
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View All Cost Guides →Planning your double glazing project? Read these guides:
Planning Your Double Glazing in London
Before you compare quotes, it's worth understanding the full UK price picture for double glazing and how London sits within it. The guides below cover average costs, what affects your quote, and how to choose a builder you can trust.
UK Double Glazing Cost Guide
Full price ranges, worked examples and the factors that move your quote — drawn from real project data across 519 UK towns.
Read the double glazing cost guide →Double Glazing Across the UK
Browse double glazing services nationwide, see what's typical in your region, and request quotes from any UK location.
Visit the UK double glazing hub →Planning Permission for Double Glazing in London
Find out whether your double glazing needs planning permission in London, what Permitted Development limits apply, and how rules differ in conservation areas, Article 4 zones, and listed-building settings.
Read the double glazing planning rules →More homeowner resources: all UK building guides, cost guides, planning permission, comparisons, how-to guides and industry insights.