Understand the building first
Listed status, conservation-area controls and Article 4 directions can affect what may be changed. Establish the planning context before committing to a final window specification.
Repair or replace?
Where original timber is sound enough to conserve, targeted repair can retain more historic fabric. Replacement becomes more relevant where condition, previous alteration or performance issues justify it.
Glass changes the appearance
Restoration glass, slimline solutions and specialist glazing can all affect reflections, pane depth and the way a historic elevation reads. The visual result matters as much as the headline performance figure.
Document the detail
A careful survey should record mouldings, bar widths, horns, sill projections and frame relationships so proposals can be developed from evidence rather than generic period styling.
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