Double Glazing Cost Calculator
Calculate Your Double Glazing Costs
Get an instant estimate for your double glazing project. Simply enter your requirements below for an accurate cost breakdown.
Your Estimated Double Glazing Cost
£0
What This Estimate Includes
Double Glazing Cost Guide
Average UK Prices by Material
| Material | Price per Window | Lifespan |
|---|---|---|
| uPVC | £150 – £600 | 20-25 years |
| Aluminium | £200 – £800 | 30-40 years |
| Timber | £300 – £1,200 | 30+ years |
| Composite | £400 – £1,000 | 35+ years |
Factors Affecting Cost
- Window Size: Larger windows cost significantly more
- Frame Material: uPVC is cheapest, timber most expensive
- Glazing Type: Triple glazing costs 20-40% more
- Energy Rating: A-rated windows cost £50-£100 more per window
- Installation: Complex installations increase costs by 15-30%
- Location: London and South East England cost 10-20% more
Energy Savings Calculator
Double glazing can reduce your heating bills by:
- Single to Double: £135-£185 annually
- Old Double to A-rated: £25-£35 annually
- Triple Glazing: Additional £10-£20 annually
These savings help offset installation costs over 8-12 years.
Installation Timeline
- Survey & Quote: 1-2 weeks
- Manufacturing: 4-8 weeks
- Installation: 1-3 days
- Total Process: 6-12 weeks
Conservation areas and listed buildings may require additional planning permissions, extending timelines by 4-8 weeks.
Frequently Asked Questions
How accurate is this calculator?
Our calculator provides estimates based on current UK market rates and typical installation costs. Actual quotes may vary by ±15% depending on specific requirements, local suppliers, and seasonal demand.
What’s included in the installation cost?
Standard installation includes removal of old windows, fitting new frames and glazing, internal finishing, and debris removal. Additional costs may apply for structural changes, decorating, or specialist disposal.
When is the best time to replace windows?
Spring and autumn offer the best balance of weather conditions and competitive pricing. Avoid peak summer months when demand is highest. Winter installations are possible but may face weather delays.
Do I need planning permission?
Most window replacements fall under permitted development rights. However, listed buildings, conservation areas, and flats may require planning permission or building regulations approval.
How long do double glazed windows last?
Quality double glazing typically lasts 20-25 years. uPVC frames may discolour after 15-20 years, whilst timber and aluminium frames can last 30+ years with proper maintenance.
What’s the difference between A, B, and C rated windows?
A-rated windows offer the best energy efficiency, saving £25-£35 annually on heating bills compared to C-rated. The upfront cost difference is typically £50-£100 per window, paying for itself within 3-4 years.
References
Energy Saving Trust. (2024). Double Glazing: A Guide to Energy Efficient Windows. London: Energy Saving Trust Publications.
Department for Business, Energy & Industrial Strategy. (2024). Household Energy Efficiency Statistics. London: HMSO.
Glass and Glazing Federation. (2024). Industry Standards for Window Installation. London: GGF Technical Publications.
Building Research Establishment. (2024). Window Energy Ratings Scheme: Technical Guide. Watford: BRE Press.
HM Government. (2024). Building Regulations Approved Document L: Conservation of Fuel and Power. London: Ministry of Housing, Communities & Local Government.
Office for National Statistics. (2024). Average Household Expenditure on Home Improvements. London: ONS Housing Statistics.