All Prior Conservatories roofs are engineered for the extremes of the UK climate and are approved by the British Board of Agrément (BBA) to last at least 25 years. They are the only systems in the world to have passed the USA's BOCA system, the toughest testing regime in the world. Our extensive research and development continues to innovate and extend the boundaries of design, so when you choose an Prior Conservatory roof, you can be certain you're getting the best.