Modern aluminium windows available in various styles including Ovolo, Chamfered and Square.

Certified under the Secured By Design scheme the Optio 58BW casement is tested to PAS 24 for maximum security and excellent thermal efficiency.

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Strong, secure, superior.

Built to the highest UK standards, this effective and high performance solution offers clean lines and advanced functionality. Available with a range of customisable options, casement windows are the perfect choice for both traditional and contemporary residential designs.

Design Features

  • Certified under the Secured By Design scheme
  • Tested to PAS 24
  • Green guide rated A
  • Integrated deep head profiles for ease of trickle ventilation
  • Unique polyamide thermal break design to improve thermal performance


  • Glazing 24mm – 40mm
  • Internally or externally glazed
  • 58mm or 70mm frame depth to accommodate
  • Varying types of applications
  • Project in or project out options
  • Available in a range of single or dual colour and anodised finishes
  • Available in the following aesthetics: Bay, Chamfered, Heritage, Ovolo and contemporary
  • Available in the following configurations: top hung, bottom hung, side hung, fixed light, multi-light and French casement
  • Available for Lifetime Homes (LFT)


U value W/m²K (Double glazing) 1.4 W/m²K
U value W/m²K (Triple glazing) 1.2 W/m²K
Window energy rating B – C
BRE Green Guide rating A Rated
Acoustic performance (dB) Rw (C;Ctr) 42 (-1;-5) dB
Air tightness (Pa) Class 4 (600 Pa)
Water tightness (Pa) Class 9a (600 Pa)
Wind load (Pa) Class E2400 (2400 Pa)
Security PAS 24
Certifications Q-mark
Secured by design

Size Limits

Top hung (max weight) 180 Kg
Side hung (max weight) 55 Kg
Bottom hung (max weight) 60 Kg (3 hinges)
Fixed light (max weight) 250 Kg

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