Window Replacement Cost in 2026
Replacement windows run £410–£1,400+ each installed. Here’s the price by type, what drives it, and how to choose efficient windows that pay you back.
Updated July 10, 2026 · 6 min read
New windows are one of the few upgrades that look better, feel better, and cut your energy bills at the same time. But pricing is confusing — quotes are usually per window, and the range is wide because frame material, glass, and installation quality vary so much.
Here’s what replacement windows cost in 2026 and how to choose ones worth the money.
2026 cost per window
Installed cost per window, including labour:
- Vinyl (most popular): £410–£900 per window.
- Fibreglass or composite: £630–£1,400 per window.
- Wood or clad-wood: £810–£1,800+ per window.
- Whole-home (10–15 windows): £5,400–£16,000 depending on material and size.
What drives the price
Two quotes can differ a lot because of:
- Frame material — vinyl is the value pick; fibreglass and wood cost more.
- Glass package — double vs. triple pane, low-E coatings, and gas fills for efficiency.
- Window size, shape, and count.
- Install type — a simple "insert" replacement costs less than a "full-frame" replacement that rebuilds the opening.
- Structural repairs — rotted framing found during removal.
Choosing efficient windows
Look for the ENERGY STAR label and check two numbers: the U-factor (lower = better insulation) and the Solar Heat Gain Coefficient (lower keeps summer heat out; a higher value can help in cold climates). The right targets depend on your climate zone — a good installer will recommend a glass package suited to your region.
Efficient windows can trim heating and cooling bills and may qualify for 2026 energy tax credits, which improves the payback. Ask your installer to identify current incentives.
What’s different in the UK
Prices on this page are in pounds sterling and reflect typical national ranges; where you are matters a lot. London and the South East run well above the national average, while much of the North, Wales and Scotland sit below it. Most quotes you receive from a tradesman will either include VAT at 20% or state that it’s added on top — always check which, as it’s a big line on larger jobs.
Larger work usually needs Building Regulations approval and sometimes planning permission, especially for extensions, structural changes or anything to a listed building or in a conservation area. Notifiable electrical and gas work must be done by a registered competent person — a Part P–registered electrician and a Gas Safe registered engineer respectively — so factor certification into the cost.
Window Replacement cost by city
See location-adjusted window replacement costs for your area:
Frequently asked questions
Are new windows worth the cost?
They improve comfort, cut drafts and noise, lower energy bills, and boost curb appeal and resale — a strong all-around return, especially if your current windows are single-pane or failing.
Insert vs. full-frame replacement?
Inserts fit into the existing frame and cost less — great when the frame is sound. Full-frame replacement rebuilds the opening and is the right call when there’s rot or you’re changing size/shape.
How long does window installation take?
A crew can often replace 10–15 standard windows in 1–2 days. Custom sizes and full-frame work take longer.
Do new windows qualify for tax credits?
Energy-efficient windows meeting ENERGY STAR criteria frequently qualify for federal tax credits in 2026, plus some utility rebates. Confirm current limits with your installer or tax advisor.
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