Casement windows are easier to refurbish than sashes unless they have damaged iron frames.
Wooden casement windows can be repaired in the same way as sashes. A full refurbishment will include stripping all the paint, treating any rot, replacing damaged wood, and refurbishing fittings.
Use the guidance for sash windows; if the damage is minor, perform a basic renovation. If more major, go for a full renovation.
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