G.F. Sprague & Co. Inc. is Weston Ma's replacement window contractor. Whether you have aluminum windows, or vinyl windows, we have the replacement window solution for you. All of our work is backed up with a 40 year handiwork guarantee. So you have self-confidence with GF Sprague with all your work for replacement windows. G.F. Sprague has been in company given that 1969 and has more than 10,000 pleased clients.