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This is for my shed. Not the house. I just picked up the glazing and am going to mount it into a wooden frame
If it's a single pane of glass, crack on.
If it's a double glazed unit, look carefully around the edges, where the sealant bonds the spacer bar and two the two panes together. Well stuck sealant should look like a black mirror. If there's any bits that look dull, it has failed. Price up a replacement and weigh up the cost/inconvenience of replacing it when iits full of condensation.A new double glazed unit with 4mm Float glass would be about £50 per square metre as supply only. Available in whatever size and overall thicknesses suits your needs.
Just to give you a bit more info. This is for my shed. Not the house. I just picked up the glazing and am going to mount it into a wooden frame
Apologies I often leave crucial info out of my statements.