Swift Windows is a well established family run business with over 30 years experience in replacement windows, doors, conservatories roof lights and roofline. We are a growing company with a strict no pressure sales policy and very well experienced, friendly staff and only pleased to help you with advice to suit your needs at all times. Swift Windows is a well established family run business with over 30 years experience in replacement windows, doors, conservatories roof lights and roofline. We are a growing company with a strict no pressure sales policy and very well experienced, friendly staff and only pleased to help you with advice to suit your needs at all times.