Welcome to Ffenestri DERWEN Windows. We are located on the outskirts of Lampeter and was established in 1991. The business employs 3 people to work in workshop and 4 fabricator fitters on site, 1 part-time office assistant and a full-time sales representatives.

Since the implementation of the Quality Assured National Warranties FEN 11302 and FENSA 20916 Registered Company regulations in April 2002, Ffenestri DERWEN Windows comply with the improved thermal performance standards and issue a QANW & FENSA certificate on all deposits received, replacement windows and doors (www.qanw.co.uk and www.fensaonline.com). 10 year guarantee details