BEFORE YOU BUY

Ask for independent test results for air permeability and water tightness (measured in Pascals).

Find out the performance values of the entire system, including frames, and not just the glazing. Ensure the product, including glass and locks, meets Building Regulations security requirements. Speak to previous and existing customers to get an honest review of the product and services offered. Check the supplier’s financial position to know they can deliver what they have quoted you.