Our ULTRA windows and doors are ideal for low energy and Passivhaus projects.
The ULTRA range offers a Passivhaus certified option with insulated frame and low U values at a competitive price. Available in FSC® timber in either redwood or oak as standard.
- U value as low as 0.68 W/m2K
- Passivhaus certified insulated frame option
- FSC® timber
- Part Q compliant and Secured by Design options