Double Glazing Installers near Gorseinon Get a Quote from your Swansea SA4 approved compny for Veka and Fensa registered offering insurance backed guarantees. Manufacturer- Installer; Ultraframe Conservatories, Canopies; uPVC – Composite GRP Doors; suppliers and installers of top quality, high security uPVC windows, doors and conservatories, established in 1994.