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Specification
Earlier than most people do. A conversation at drawing stage costs nothing and routinely prevents changes that cost thousands once the building is underway.
Written by Windows in the Lakes · A trading name of Home Glazing Ltd · Last reviewed 21 September 2026
Speak to a glazing specialist as soon as you know roughly where the glass is going — typically at concept or early drawing stage, before drawings are finalised and well before structural work begins. You do not need a finished design, a fixed budget or a product decision. What an early conversation establishes is whether the openings are feasible, how thresholds and structure need to be detailed, what lead times apply, and whether the glazing you have in mind is realistic for the budget.
In short: speak to a glazing specialist as soon as you know roughly where the glass is going. You do not need a finished design, a budget or a decision on products — you need the openings to be feasible, the thresholds to be planned and the costs to be realistic before the drawings harden.
None of these are fatal. All of them are cheaper to avoid than to solve.
Regulatory and technical points in this guide should be checked against the current published guidance below, and against the specific circumstances of your property.
Guidance last reviewed 21 September 2026 by Windows in the Lakes
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