The works themselves should meet the relevant technical requirements in theBuilding Regulationsand they should not make other fabric, services and fittings less compliant than they previously were - or dangerous. For example, if you replace external windows or doors the building should comply to at ...
To ensure fire safety, external walls must have a specified fire resistance duration. Unprotected areas, including windows and doors, are those that do not meet the specified fire resistance duration. Each country has set exact separation requirements for unprotected areas on external walls. However,...