sales@cleaveyglass.co.uk 
01604 931423 
Unit D, Edison Courtyard, Brunel Road, Corby NN17 4LS 
Mon - Thur: 9AM - 4PM Fri: 9AM - 3PM
Replacement Sealed Units for Homeowners
Condensation between your window panes? We supply homeowners across Northamptonshire with high-quality replacement sealed units. Like-for-like replacements or upgrade to energy-efficient specifications.
We supply homeowners with high-quality replacement sealed units. If your sealed unit has condensation between the panes, we can provide a like-for-like replacement or upgrade you to a more energy efficient specification.
Condensation, misting, or cloudiness between the glass panes means your sealed unit has failed and needs replacing. The good news? You don’t need to replace the entire window — just the sealed unit itself, saving you significant cost compared to full window replacement.
We also replace old, sealed units with energy efficient integral blind units, giving you maintenance-free window coverings while improving thermal performance.
Serving homeowners across Northamptonshire and within an 80-mile radius of Corby.
Is Your Double Glazing Failing?
Condensation Between Panes Moisture, misting, or water droplets trapped between the glass layers indicates seal failure. This cannot be fixed — the unit needs replacing.
Cloudy or Hazy Glass Permanent cloudiness or haziness between panes, even when dry, shows the seal has failed and contamination has entered the unit.
Visible Deterioration Discoloration, staining, or residue between the glass panes that won’t clean off from either side.
Drafts Around Edges Cold air leaking around the sealed unit perimeter indicates seal degradation affecting thermal performance.
Energy Bills Increasing Failed seals mean lost insulation — heat escapes through the window, increasing heating costs.
Difficult to See Through Severe misting making it hard to see through the window clearly, especially problematic in doors and frequently-used windows.
If you’re experiencing any of these problems, contact us for a free assessment and quote.
Replacement Options for Your Home
Like-for-Like Replacements
We can provide exact replacements matching your existing sealed units.
What We Match:
- Glass thickness and unit size
- Tinted or clear glass
- Obscure glass patterns
- Georgian bar configurations
- Spacer bar colour and type
- Overall unit dimensions
Perfect for maintaining consistency across all windows in your property, especially when only some units have failed.
Process: Please contact us with your project specifications.
Energy Efficiency Upgrades
Why replace with the same old specification? We can upgrade your replacement units with modern energy-efficient technology.
Upgrade Options:
-
Low-E Energy Efficient Glass
Reduces heat loss, lowers energy bills -
Argon Gas Filling
Enhanced insulation compared to air-filled units -
Warm Edge Spacer Bars
Improved thermal performance at glass edges
Benefits: Lower heating costs, reduced condensation on frame edges, improved comfort, increased property value, modern performance with existing frames.
Integral Blind Unit Conversions
Replace old sealed units with energy efficient integral blind units.
Benefits:
- Blinds sealed between glass panes
- Never need cleaning
- Always dust-free
- No maintenance required
- Child-safe (no cords)
- Energy efficient Low-E glass included
- Various colours available
Perfect for bathrooms, kitchens, and bedrooms where privacy and cleanliness matter.
Significant Cost Savings
Unit Replacement vs Full Window Replacement:
Most homeowners are unaware that when double glazing fails, it typically only needs to be replaced, not the entire window frame.
Benefits:
- Save 60-70% compared to full window replacement
- Keep existing frames if they’re in good condition
- Less disruption to your home
- Faster installation
- Maintain original window style
- No redecorating around new frames
Please contact us for your free competitive quote.
Service Designed for Homeowners
Clear Pricing Transparent quotes with no hidden costs. You know exactly what you’re paying before we start.
Quality Guaranteed All replacement units meet BS EN 1279 standards and undergo rigorous quality control.
Local Service Based in Corby, serving homeowners throughout Northamptonshire and within 80 miles.
Expert Advice We guide you through options, explaining benefits of upgrades without pressure.
Simple 4-Step Process
1. Contact Us Call, email, or request a quote online with basic details about your windows.
2. Quote Provided Clear pricing for like-for-like replacement or upgrade options.
3. Manufacturing Units made to measure in our facilities to your exact specifications.
4. Delivery & Installation Guidance Scheduled delivery with advice on installation, or we can recommend trusted installers.
FAQ
How much does it cost to replace a sealed unit?
Prices vary by size and specification. Contact us for a free quote — replacement units typically cost 60-70% less than full window replacement.
Can I replace just one failed unit or do I need to do all windows?
You can replace individual failed units. However, if one has failed, others of the same age may fail soon. We can advise on your specific situation.
Can you match my existing obscure glass pattern?
Yes, we can match most obscure glass patterns. Bring photos or we’ll identify during site survey.
How long does replacement take?
Contact us for current lead times based on your specifications.
Serving Homeowners Across Northamptonshire
We supply replacement sealed units to homeowners throughout Northamptonshire and within an 80-mile radius of Corby.
Areas Covered: Corby, Kettering, Wellingborough, Northampton, Daventry, Rushden, Oundle, Thrapston, and all surrounding areas including parts of Leicestershire, Cambridgeshire, Bedfordshire, and Buckinghamshire.
Contact us to confirm we cover your area.
Get Your Misted Windows Fixed
Contact us for a free quote. We can discuss your options, and provide clear pricing for replacement or upgrade
Call Us: 01604 931423