About Us At MPN Window we are a family run Welsh Double Glazing Business with Showrooms in Cardiff, Swansea, Neath, Port Talbot, Bridgend and Aberdare supplying customers across South Wales with quality Composite Doors, Triple Glazing, PVC Windows, Pvc doors, French Doors, Conservatories and more. Established in 1994, we pride ourselves on our extensive knowledge and experience in the industry, always ensuring you receive excellent Customer Service and Products with no hidden charges. We specialise in Conservatories, PVC Windows, PVC Doors, Bi - Fold Doors, Composite Doors, Patio Doors and Roofline, offering top quality products for competitive prices with more than 20 years experience. All installations are carried out by trained and experienced fitters and tradesmen who cause minimum disruption, treating your home with the same care and respect as they would their own. So if you're in the market for a conservatory, doors or windows talk to the experts today.