When your windows start to show signs of wear—whether through draughts, condensation, or difficulty opening—you may wonder whether it’s best to repair them or invest in new ones. Understanding replacement window costs versus repair costs can help you make an informed decision that saves you money in the long run.
In this guide, we compare replacement window costs, helping you determine which option is best for your home.
1. Common Window Issues: Repair or Replace?
Before deciding, it’s important to assess the extent of the problem. Some issues can be fixed with minor repairs, while others may require a full window replacement.
Issues That Can Be Repaired
- Minor draughts – Resealing or adding weatherstripping
- Broken locks or handles – Replacing hardware components
- Foggy glass (condensation inside double glazing) – Some companies offer defogging services
- Small cracks in the frame – Filling with sealant or repainting
Issues That Require Window Replacement
- Severe condensation inside the glass – A sign of a failed window seal
- Rotted or warped wooden frames – Weakens insulation and security
- Cracked or shattered glass – May require full unit replacement
- Outdated, single-glazed windows – Poor energy efficiency and noise insulation
If your windows are over 15-20 years old, replacement is often the more cost-effective choice in the long term.
2. Cost Comparison: Repair vs Replacement
Window Repair Costs (Per Window)
- Re-sealing gaps & draught-proofing – £50 – £150
- Fixing locks, hinges, or handles – £75 – £200
- Glass defogging (temporary fix) – £100 – £300
- Replacing double glazing unit (keeping frame) – £150 – £400
Replacement Window Costs (Including Installation)
- uPVC Casement Window – £250 – £750
- Sash Window – £600 – £1,200
- Tilt & Turn Window – £500 – £900
- Bay Window – £1,500 – £3,000
- Triple Glazing Upgrade – +£200 – £500 per window
In general, repairing a window is cheaper upfront, but if the problem recurs, a replacement may be the better long-term investment.
3. When Does It Make Financial Sense to Replace Windows?
Even though replacement window costs are higher than repair costs, new windows can save you money in several ways:
Lower Energy Bills
- Old single-glazed or poorly sealed windows let heat escape, increasing heating costs.
- A-rated double glazing can reduce heat loss by up to 50%, cutting energy bills by £200+ per year.
Better Home Value
- New windows improve curb appeal and energy efficiency, making your home more attractive to buyers.
- According to UK property experts, replacing windows can increase home value by up to 10%.
Less Maintenance & Future Replacement Window Costs
- New uPVC and composite frames require little to no maintenance.
- No need for constant repairs or repainting, which adds up over time.
If your current windows need frequent repairs, replacing them will save you money in the long run.
4. Should You Replace Just the Glass or the Entire Window?
If your window frame is in good condition, you may not need a full replacement. Instead, you can replace just the double glazing unit while keeping the existing frame.
Cost to Replace Just the Glass
- Single-glazed unit replacement – £100 – £300 per window
- Double-glazed unit replacement – £150 – £400 per window
- Triple-glazed unit replacement – £300 – £600 per window
If your frames are damaged, rotting, or poorly insulated, a full window replacement is the better option.
5. How to Reduce Replacement Window Costs
If you decide to replace your windows, here’s how to keep costs down:
- Replace multiple windows at once – Many companies offer discounts for bulk replacements.
- Choose uPVC over timber or aluminium – It’s the most cost-effective and low-maintenance option.
- Look for energy efficiency grants – Some government schemes help reduce costs.
- Opt for standard sizes – Custom-shaped windows are more expensive.
- Compare at least 3 quotes – Prices can vary significantly between suppliers.
Investing in energy-efficient windows can offset the initial cost through long-term savings.
6. Final Verdict: Repair or Replace?
Choose Repair If:
- The issue is minor, such as a faulty hinge or lock.
- The frame is still in good condition with no signs of rot or warping.
- You’re looking for a short-term fix while planning a future replacement.
Choose Replacement If:
- The window is over 15 years old and has multiple issues.
- You experience high energy bills due to poor insulation.
- The glass is cracked, misted, or broken inside a sealed unit.
- You want to increase home value and reduce maintenance.
If repairs are becoming frequent and costly, replacement window costs will be more cost-effective in the long run.
Get a Free Quote for Window Repairs & Replacements with Cove Glass
Whether you need window repairs or full replacements, Cove Glass offers high-quality double glazing and energy-efficient window solutions at competitive prices. Contact us today for expert advice!
📞 Call us: 01252 318787
📧 Email us: sales@coveglass.co.uk
🔗 Learn more: Replacement Window Costs & Services
Replacement Window Costs FAQs
Q1: How much does it cost to replace all windows in a house?
A1: For an average 3-bedroom home, expect to pay between £4,000 – £8,000, depending on window type and material.
Q2: Can I just replace the glass instead of the whole window?
A2: Yes! If your frames are in good condition, you can replace just the double glazing unit, saving £100s per window.
Q3: How long do new replacement windows last?
A3: High-quality uPVC or aluminium windows last 20-30 years, depending on maintenance.
