Your UPVC windows aren't working properly. Maybe they're misted up, the handles are stiff, the hinges have gone, or they just feel draughty. The question is: do you need to repair them or replace them entirely? The answer depends on several factors — and could save you hundreds or even thousands of pounds.
When Repair Is the Right Call
Repair is almost always the better option when the UPVC frames are structurally sound. Most window problems are component failures — not frame failures. Here's what can typically be repaired:
- • Misted or foggy glass: The sealed unit is replaced within the frame (£60–£120)
- • Broken handles: Direct replacement with matching or upgraded handles (£30–£60)
- • Worn hinges: New friction stays or casement hinges fitted (£50–£90 per pair)
- • Faulty locks: Espagnolette or shootbolt mechanisms replaced (£40–£80)
- • Draughty seals: Rubber gaskets replaced to restore weatherproofing (£5–£15 per metre)
- • Dropped doors: Hinges adjusted and keeps re-aligned (£60–£120)
If your windows are 10–20 years old and only one or two components have failed, repair is almost certainly the most sensible option. A well-repaired window can give you another 10–15 years of service.
When Replacement Makes More Sense
There are situations where replacement is the smarter investment:
- • Cracked or warped frames: Once UPVC frames lose structural integrity, repair isn't viable
- • Severe discolouration: Yellowed or faded frames that can't be cleaned or restored
- • Multiple failures across many windows: When the repair bill approaches 50%+ of replacement cost
- • Windows over 25 years old: Older UPVC is less energy-efficient and may not meet modern security standards
- • Upgrading for energy efficiency: Modern A-rated windows can significantly reduce heating bills
- • Selling your home: New windows can add value and improve kerb appeal
The Cost Comparison
For a typical 3-bed semi-detached house with 8 windows:
- • Repairing 4 misted units + 3 handles + 1 hinge pair: approximately £500–£800
- • Replacing all 8 windows: approximately £3,500–£6,000
That's a potential saving of £3,000–£5,000 if the frames are sound and only components need attention. Even if you need to repair every window, the total bill is typically a fraction of full replacement.
The Environmental Impact
UPVC takes hundreds of years to decompose in landfill. By repairing your windows instead of replacing them, you're keeping perfectly good frames in service and reducing waste. Of course, if replacement is genuinely needed, modern UPVC is more recyclable than older formulations — and the energy savings from better-insulated windows offset the manufacturing impact over time.
How We Can Help
At Restoration Glazing, we offer both UPVC window repair and full replacement. We don't work on commission and we don't have targets to hit — so you'll always get honest, impartial advice. We'll assess your windows, explain your options, and give you a free quote for whichever route makes the most sense. No pressure, no hard sell.
Frequently Asked Questions
How long do UPVC windows last?
Quality UPVC windows typically last 20–30 years. Individual components may need replacing sooner, but well-maintained frames can last even longer.
Can old UPVC windows be repaired?
Yes, most problems can be repaired. Failed sealed units, handles, hinges, locks, and seals can all be replaced individually — even in windows that are 20+ years old.
When should I replace rather than repair?
When frames are cracked, warped, or severely discoloured, when multiple components have failed across several windows, or when you want to upgrade to A-rated energy-efficient glazing.
How much can I save by repairing?
Typically 60–80% savings compared to full replacement. A repair bill of £500–£800 vs replacement at £3,500–£6,000 for a 3-bed house.