See double-glazing costs for a typical 3-bedroom house →
What affects the cost?
Current Checkatrade 2026 guidance places a typical 3-bedroom whole-house double-glazing project at about £8,000–£15,000. Individual fitted-window benchmarks vary sharply by style: casement windows are around £500–£1,250, sash £700–£1,500, sliding and tilt-and-turn £600–£1,400, bay £1,100–£4,000 and bow windows £1,500–£5,000 or more.
- Casement, sash, sliding, tilt-and-turn, bay or bow style
- Window dimensions and opening configuration
- uPVC, aluminium or timber frame specification
- Double versus triple glazing
- Number of windows in the order
- Scaffolding or difficult access
- Making good around the openings
Typical cost breakdown
Regional planning examples
The examples below apply our published modelling factor to the same national benchmark. They are not claimed as observed city-wide average quotes.
Replacement windows costs by location
Open a detailed city page to see the same national benchmark adjusted through the transparent regional model, with local planning considerations and worked examples.
Sources used for this guide
Double Glazing Costs in the UK in 2026
Published / checked: May 2026
Used for: Replacement window ranges by window type and whole-house double glazing benchmarks
Frequently asked questions
How much does double glazing cost for a 3-bedroom house in 2026?
Checkatrade’s current whole-house benchmark for a typical 3-bedroom home is about £8,000–£15,000. The number, size and style of windows can move a real quote materially outside a simple per-window estimate.
How much is a casement window fitted?
The current fitted benchmark is about £500–£1,250 per casement window, averaging around £1,000.
Are sash windows more expensive than casement windows?
Typically yes. The current sash benchmark is about £700–£1,500 per window, compared with £500–£1,250 for casement windows.
How much do bay or bow windows cost?
Current guidance gives around £1,100–£4,000 for a bay window and £1,500–£5,000 or more for a bow window. Size and structural complexity are important variables.
Related costs
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About £76,690 for the published 3-bed benchmarkView guide →