Standard Glass Specification

Our standard glazing specification has been selected to meet the expectations of homeowners looking for energy-efficient sash windows in London. Each double glazed unit includes:

  • 4mm clear toughened outer glass
  • 16mm spacer bar
  • 4mm clear toughened inner glass
  • Low-E glass coating
  • Argon gas filled cavity

This combination helps improve heat retention and supports better insulation throughout the year. For many owners of older London homes, this is an important upgrade that improves comfort without changing the classic look of the property.
Additional glazing options, including obscure glass, may also be available where extra privacy is required.