· Estimia · Regulations & Permits
Window Requirements for Historic and Protected Buildings in Spain: How to Modernise Legally
Old, draughty windows in a protected building are a frustration — but you can't simply swap them for modern PVC. Catalogued buildings, BIC monuments and conjuntos históricos come with heritage rules on profiles, colours, divisions and materials. This guide explains what you can and can't change, how heritage approval works, and the special glazing that improves comfort while keeping the historic look.