Windows and Doors in Historic Buildings
This page provides advice on improving the thermal performance of both windows and doors, which can be upgraded relatively easily without detracting from their appearance.
Draught-proofing windows and doors
Older buildings are prone to lose heat through gaps, which develop as various building elements move and distort over a long period. This can often be the case with windows and doors so that draughts develop.
Draught-proofing is one of the most cost-effective and least intrusive ways of improving the comfort of occupants and reducing energy use with little or no change to a building’s appearance.
Make sure you repair windows and doors before embarking on any draught–proofing measures.
Energy Efficiency and Historic Buildings: Draught-proofing windows and doors
This guidance note provides advice on the principles, risks, materials and methods for improving the thermal performance of existing windows and doors by draught-proofing.Learn more
Secondary glazing for windows
Secondary glazing is a fully independent window system, installed on the room side of existing windows. The original windows remain in position in their unaltered form.
Research has shown that heat loss can be reduced by over 60% by using secondary glazing with a low emissivity hard coating facing the outside.
Energy Efficiency and Historic Buildings: Secondary glazing for windows
This guidance note provides advice on the principles, risks, materials and methods for upgrading the thermal performance of windows by the addition of secondary glazing.Learn more
Energy Efficiency and Historic Buildings: Insulating dormer windows
This guidance note provides advice on the principles, risks, materials and methods for insulating dormer windows. Dormers come in a large variety of shapes, sizes and materials and can be a particularly difficult element to insulate.Learn more
Related research on windows
Please read our report on Improving the Thermal Performance of Traditional Windows: Metal-framed Windows.