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Secondary glazing is the solution endorsed by English Heritage, Historic England and most conservation officers for improving window performance in listed buildings and conservation areas. Installed internally, fully reversible, and does not alter the external appearance of the building.
Listed building regulations typically prohibit replacing original windows with double glazing as this would alter the historic fabric. Secondary glazing avoids this by installing internally without touching the original window, frame or surrounding masonry. The external appearance is unchanged, and the unit can be removed completely without trace.
In most cases, no listed building consent or planning permission is required as the installation satisfies the criteria for a reversible, non-intrusive internal alteration. Requirements vary between local authorities. We recommend checking with your conservation officer before proceeding. We can assist with documentation for any consent applications required.
For listed buildings we recommend slim aluminium profiles colour-matched to the existing window frame. For non-standard shapes (arched, Gothic, curved) our bespoke manufacturing service produces units to match any window geometry. Available in 200+ RAL colours.
Up to 80% noise reduction with acoustic specification. Up to 65% heat loss reduction with Low-E glass. Eliminates draughts and condensation. Protects original glass from temperature deterioration.
Send us a photo and dimensions — no site visit needed. Reply within 24 hours.