About Us - We're Wales's no.1 Home Improvement Company MPN Windows is an established family-run Welsh business with showrooms in Swansea, Cardiff, Bridgend, Port Talbot and across South Wales. Established since 1994, the company is owned by a husband, wife and son team; 'MPN' stands for Melanie, Paul and Nathan - and you can't get much more family-oriented than that! Our sterling reputation is vitally important to us and we work extremely hard to uphold it, which explains why so many of our customers approach us based on recommendations from family and friends. We work with homeowners throughout South Wales from Carmarthen to Swansea from Porthcawl to Cardiff where we supply and install the highest quality windows, doors and conservatories - designed to your specifications - in an efficient and cost-effective way.