Sealed Unit Replacement for uPVC Windows & Doors
Misted, cracked or failing double glazing? We supply and fit made-to-measure sealed units for uPVC windows and doors. Choose from energy-efficient upgrades, safety glass, and decorative options with a 10-year guarantee against defects.
Professional Sealed Unit Replacement
Restore clarity, insulation and security with made-to-measure sealed units. We replace failed or damaged units in uPVC windows and doors without changing the frames, saving you time and money. Our technicians measure precisely, source the right specification, and fit cleanly with minimal disruption.
Upgrade options include argon gas fill, warm-edge spacers, toughened or laminated safety glass, acoustic glass, and decorative finishes. All units are supplied and fitted with a 10-year guarantee against manufacturing defects.
- Standard Double & Triple Glazed Units
- thermal performance with low-E coatings for efficiency
- Toughened / Laminated Safety Glass
- enhanced strength and security where safety is required
- Argon Gas Filled Units
- improved insulation and reduced heat loss
- Leaded, Georgian & Duplex Bars
- traditional detailing with modern performance
- Cat Flaps & Static/Trickle Vents
- factory-prepared glazing to suit pet access and ventilation
- Obscure & Acoustic Glass
- privacy patterns and noise-reduction options
Why Choose Tommy’s Windows?
- Repair-first approach
- Keep your existing frames and replace only the failed glass unit for a cost-effective fix.
- Made-to-measure precision
- Accurate surveying ensures the right thickness, spacer, coating and safety spec for each opening.
- Energy-efficient upgrades
- Low-E coatings, argon gas and warm-edge spacers help reduce heat loss and condensation.
- Safety & compliance
- Toughened or laminated glass supplied where required for doors, low-level glazing and bathrooms.
- Clean, tidy installation
- Minimal disruption, careful handling, and responsible waste removal as standard.
- 10-year guarantee
- Sealed units are guaranteed against manufacturing defects for long-term peace of mind.
What customers say about this service
We had a window that randomly popped before we went on holiday, we phoned up Tommy, he was able to come and measure up the same day, get the replacement ordered and delivered 3 days later. Bear in mind it was a bespoke double glazing with lead! He knew how to work on a window like a real professional, had all the right tools, and he also went above and beyond by cleaning both windows! I mean, if only you could find more tradesmen like this.
Tommy fitted a cat flap into my French door - new glass panel measured, ordered and fitted within the week. Cat flap installed and helped carry to storage the spare glass panel. Tommy was efficient, tidy and friendly with great communication throughout via email and face to face. Absolutely recommended. Thanks.
I cannot rate Tommy any higher! I had a cap flap fitted in a new glass window. Tommy is super knowledgeable, friendly and communication was spot on. Great working with Tommy! Thanks again
Frequently Asked Questions
Key information about sealed unit replacements, specifications and lead times.
Yes. We measure and replace the sealed unit only, which restores clarity and insulation while keeping your existing uPVC frames.
Failure of the perimeter seal allows moisture in between the panes. Replacement of the unit is the permanent fix.
Survey is quick, and fitting a typical unit takes around 20–40 minutes per opening once the unit is ready. Lead times depend on the specification.
Yes. We supply toughened or laminated safety glass where required by regulations or for extra security and peace of mind.
Absolutely. We can match existing styles or create new designs to suit your property.
Yes. All supplied and fitted sealed units come with a 10-year guarantee against manufacturing defects.
Restore Clarity and Efficiency
Get a free quote for sealed unit replacement and optional upgrades like argon gas, safety glass and decorative finishes.