Residential glass / Project guidance

Foggy window glass replacement

A window that stays cloudy between its panes may need a replacement sealed unit. Start by distinguishing trapped moisture from condensation on an accessible glass surface.

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Service suitability, location coverage and scheduling must be confirmed for your project.

Cloudy double-pane kitchen window beside a clear pane overlooking a garden

Identify where the moisture sits

Record whether the haze can be wiped from the room side or outside surface, and whether it changes with weather. Persistent moisture inside the sealed cavity needs a different assessment from indoor condensation. Photographs in daylight, the affected room and any visible unit markings help identify the opening.

Assess glass-only replacement

A sound sash and frame may be retained when a compatible sealed unit is available. Glass thickness, spacer width, coatings and safety-glazing requirements must be confirmed before fabrication. Existing damage, decay or drainage problems can widen the work. Compare this symptom-based enquiry with our double-pane unit guidance for the replacement specification.

About this service

Questions before
the next step.

Do I need a whole new window?

Not always. A glass-only replacement may be possible when the sash, frame and glazing system remain suitable.

Is defogging the same as replacing the sealed unit?

No. A treatment that changes visible moisture should not be assumed to restore the original sealed-unit construction or performance. This service focuses on assessing replacement.