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Slim Profile Vacuum Glass for Listed Buildings

Slim Profile Vacuum Glass for Listed Buildings

Heritage-grade slim vacuum glazing — 6.4 mm total thickness allows a like-for-like replacement of single Crown or Cylinder glass in listed sash and casement windows, while delivering a U-value of 0.7 W/m²K. Listed Building Consent friendly.

listed building double glazing
icon vacuum listed buildings sm
listed building double glazing
icon vacuum listed buildings sm
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Trent Glass Slim Profile Vacuum Glass for Listed Buildings is a heritage-specification VIG product designed for direct replacement of single-glazed Crown or Cylinder glass in listed sash windows, casements and crown-glass picture windows. The 6.4 mm overall thickness fits into period rebates without sash modification, preserving the original glazing bars and reveals — which is critical for Listed Building Consent. Lead times and conservation officer liaison handled by the Trent Glass team.

Key Features

  • Total thickness: 6.4 mm — fits 19th-century sash rebates without modification
  • U-value: 0.7 W/m²K (centre-pane)
  • Sympathetic glass: low-iron or restoration-grade outer ply mimicking Crown / Cylinder distortion
  • Slim 4 mm sightline edge seal — invisible behind original putty bedding
  • Compatible with traditional linseed-oil putty glazing
  • We handle Listed Building Consent liaison and prepare the heritage statement on your behalf

Ideal Applications

  • Grade I and Grade II listed Georgian / Regency sash windows
  • Victorian / Edwardian casement and bay windows
  • Conservation-area properties (Article 4 Direction zones)
  • Heritage barn conversions
  • Listed-building hotel and pub refurbishments
  • Country house and chateau retrofits
  • Church and ecclesiastical fenestration upgrades
  • Mews and historic mews-yard properties

Technical Specifications

  • Glass build-up: 3 mm + 0.4 mm vacuum + 3 mm (total 6.4 mm)
  • U-value: 0.7 W/m²K (centre-pane)
  • Edge: 4 mm laser-welded glass-to-glass; matched putty colours available
  • Sightline: as little as 6 mm from glass edge
  • Maximum unit size: 1200 × 2000 mm
  • Acoustic insulation: Rw 32 dB; up to 42 dB with secondary glazing
  • Compliance: BS EN 1279; Historic England-compatible specification
  • Heritage support: pre-LBC consultation, photographic survey, statement of significance template
  • Lead time: 8–10 weeks from sign-off (consent stage additional 4–8 weeks)