Optio 58BW Flush HI Window

Stylish and durable flush aluminium window

Achieve minimal sightlines and maximum weather resistance with 58BD Flush HI aluminium window

The latest addition to our industry-favourite window series, the 58BW Flush offers uncompromised style and performance.


This innovative aluminium flush window is a perfect choice for contemporary new-builds and refurbishment projects, with its minimal sightlines, advanced performance, incredible versatility and complete security. The 58BW Flush HI can be used to achieve a sleek, minimal aesthetic to suit any project.


The 58BW Flush HI achieves greater weather performance with friction stays on the side-hung windows, where alternatives in the market offer peg stays that are vulnerable to damage in windy conditions. Keep your home warm and comfortable with impressive U-values of 1.2-1.4 W/m2K, and class-leading air, water and wind resistance.


  • Advanced weather performance – features like the double rebate, and friction stays on side-hung windows offer protection against bad weather conditions
  • Slimmer sightlines – 53mm ultra-slim sash suits a range of property styles
  • Flexible design choice – the flush shadow line can be complimented with a choice of flat, putty line or stepped edge vent styles to suit the property
  • Safe and secure – tested to PAS 24 and certified under the Secured by Design scheme


  • Advanced weather performance
  • Tested to PAS 24 and certified under the Secured by Design scheme
  • Slim 53mm sash
  • Multi-Point Locking
  • Smoke Vent Compliance Single or Dual colour options


  • Available in flat, putty line and stepped edge vent styles
  • Available in many window configurations
  • Maintain the same flush aesthetic with our 58BD Flush Door


The 58BW Flush HI range is a tried and trusted window system that delivers exceptional performance, functionality and safety.

Low U-values of 1.2 for triple glazing make this energy-efficient window the ideal partner for refurbishment projects where warmth and comfort are as important as style.

With impressive air, water and wind resistance test figures, this system can withstand extreme weather conditions, keeping your home warm and dry.

Safe and extremely secure, this window system is certified under the Secured by Design scheme, and tested to PAS 24, which means it has been rigorously tested for your peace of mind.

As with all AluK aluminium systems, the 58BW Flush HI is available in single or dual colour powder coating, texture and anodised finishes.

Standard Technical Data HI technical data
U value W/m²K 1.5 W/m²K 1.2 W/m²K - 1.4 W/m²K
Window energy rating B-C B-C
Air tightness (Pa) Class 4 (600 Pa) Class 4 (600 Pa)
Water tightness (Pa) Class 9A (600 Pa) Class 9A (600 Pa)
Wind load (Pa) Class E2400 (2400 Pa) Class E2400 (2400 Pa)