Our Services

Double Glazed Unit Replacement

Replacement of failed, misted or blown double glazed units.

A failed double-glazed unit can affect comfort, appearance and the performance of a window. We assess the accessible glass unit, frame and surrounding condition to establish whether replacing the unit is a sensible local repair.

This service focuses on suitable unit replacement. It does not assume every condensation or water problem is caused by the glass alone.

When this service may help

Misting or condensation between panes
A cracked, damaged or discoloured sealed unit
Reduced clarity or a visible failed edge seal
A single window that appears less comfortable or weather-resistant than others

What we look at / do

The accessible glass unit and visible edge seals
Frame condition and obvious fitting limitations
Whether the concern could relate to ventilation, internal humidity or another building issue
Practical options for a like-for-like replacement where suitable

How the service works

1
Assess the unit
We inspect the accessible condition and confirm the likely repair route.
2
Measure and specify
The replacement is matched to the opening and agreed specification.
3
Replace where suitable
The unit is fitted carefully and the immediate fit is checked.
4
Explain any wider issue
If the evidence points beyond the unit, we set out the sensible next step.

What's included

Assessment of the existing glazing
Measurement of the required replacement unit
Replacement of failed or blown double glazed units
Removal of the existing failed unit
Installation of the replacement unit
Scaffolding identified separately on the quotation where required

What you'll receive

Assessment of the affected unit
Agreed replacement specification
Clear scope for fitting where appropriate
Advice if another issue needs attention

Pricing

What this costs

Treatment guide prices

Double-glazed unit replacement
Typical guide range
£114.00–£240.00 inc VAT / Item
Per standard sealed unit.
Usually includes: Supply and fitting of a standard replacement sealed unit.
What can change the price: Specialist, large or safety glass may cost more.
Last reviewed 23 August 2026

Development guide prices only. Final prices depend on the property, access and scope required and will be confirmed in writing.

See full damp & mould pricing guide

Important to know

A replacement sealed unit cannot by itself resolve condensation caused by indoor humidity, insufficient ventilation or cold surrounding surfaces. Frame damage, drainage issues or inaccessible parts may need separate assessment.