Margam Door Fitters. MPN Windows and Doors Margam based in Port Talbot SA13 with modern door showrooms for Veka and Endurance doors over the full range, Front Doors, Back Doors, Patio Doors, Composite Doors, Solid Timber Core Doors, GRP Doors with a buyers guide to new or replacement bespoke made to measure door in Margam. Get a Margam Door Quote Here.