Authoritative sources supporting the information in this article.
British Standards Institution (BSI) (2017). Thermal performance of windows, doors and shutters. Calculation of thermal transmittance. General. BS EN ISO 10077-1:2017.
This standard provides the methodology for calculating the thermal performance of windows, essential for calculating energy savings in an ROI model.
Historic England (formerly English Heritage) (2017). Traditional Windows: Care, Repair and Upgrading. Historic England Research Reports.Open source
Provides authoritative data on how secondary glazing improves thermal efficiency in heritage buildings without compromising historic fabric, a key factor for ROI in older properties.
Department for Levelling Up, Housing and Communities (2021). Approved Document L: Conservation of fuel and power, Volume 1: Dwellings. HM Government - Building Regulations.Open source
Statutory guidance on fuel and power conservation in UK buildings, providing the regulatory framework for energy efficiency improvements.
Saint-Gobain / Glass and Glazing Federation (GGF) (2022). The GGF Guide to Energy Efficient Windows and Secondary Glazing. Industry Technical Manuals.Open source
The GGF's energy savings calculator methodologies are industry standard for predicting the financial payback period of secondary glazing installation.
British Standards Institution (BSI) (2013). Acoustics. Rating of sound insulation in buildings and of building elements. Airborne sound insulation. BS EN ISO 717-1:2013.
The primary standard for measuring sound insulation in buildings, necessary for calculating the ROI in terms of property value increase and acoustic comfort.
