The problem
The existing windows were an important part of the period interior, but their thermal performance left rooms uncomfortable. The client needed a discreet internal solution and wanted clarity about permissions before work began.
The specification
We installed 10.8mm acoustic laminated glass in engineered aluminium frames, measured to the existing openings. The internal system was designed to respect the period window, preserve the original features and provide practical access for cleaning.
Measured result
The measured window U-value improved from 5.2 to 2.1 W/m²K. No planning permission was needed for this installation, and the original period features were preserved. Consent requirements vary, so property-specific guidance remains essential.
Installation and guarantee
Engineered aluminium frames and the agreed laminated-glass specification were fitted internally to preserve the existing features. The installation was completed in a single day with the room protected throughout the work. Installation was completed in a single day, and the installed work carries a 10-year guarantee.
Details verified with the client. Individual results vary by property.