5 Signs It's
Time to Replace
Your Windows
How to know when your windows need replacing and what to expect.
Updated December 2026 • 6 min read
Introduction
Most modern windows last 15–25 years depending on the material, climate, and maintenance. But some fail sooner. Here are five clear signs it's time to replace your windows.
The 5 Signs
1. Misted or Condensation Between Panes
If you see condensation, fog, or moisture trapped between the glass panes, the sealed unit has failed. This means the insulating gas has escaped and your window is no longer energy-efficient. The unit needs replacement.
2. Draughts and Air Leaks
Feel cold air coming around your windows even when they're closed? Draughts mean your seals have worn out. This increases heating bills and reduces comfort. Modern replacement windows eliminate draughts with tight seals.
3. Difficulty Opening or Closing
Windows that stick, jam, or require excessive force to open are a sign the frame is warping or the hinges are failing. This is a common issue in older timber windows and single-glazed units in humid climates.
4. Visible Damage or Decay
Cracks, rot, rust, or peeling paint are red flags. Wood windows may show water damage or rot at the sill. Metal frames may rust. Once decay starts, it spreads. Replacement is usually the best solution.
5. Single Glazing (Only One Pane of Glass)
Single-glazed windows are extremely poor insulators by modern standards. If your home still has single glazing, upgrading to double (or triple) glazing will significantly improve energy efficiency, reduce noise, and increase comfort.
Benefits of Window Replacement
- ✓Lower Energy Bills — Modern windows are 30% more efficient than single-glazed originals.
- ✓Improved Comfort — No more draughts, cold spots, or condensation.
- ✓Increased Security — Modern windows come with advanced locks and toughened glass.
- ✓Noise Reduction — Double and triple glazing reduce outside noise significantly.
- ✓Boost Home Value — New windows increase curb appeal and property value.
- ✓Low Maintenance — uPVC windows need only occasional cleaning.
How Long Do Windows Last?
Don't Wait — Act Now
Failing windows cost you money every month in wasted heating energy. A professional window replacement can pay for itself in energy savings within 5–10 years. Plus, you'll immediately enjoy better comfort and security.
At Hewitts, we provide free quotes and can handle your entire window replacement project from start to finish.
Next Steps
If you've spotted any of these signs in your home, it's time to get a professional assessment. Call Hewitts for a free, no-obligation quote. We'll inspect your windows, discuss your options, and explain what replacement would look like for your home.
Get Your Free Window Replacement Quote
No obligation. We'll assess your windows and provide a clear, honest price.