Jefnik Windows and Doors is your source for new doors, replacement doors, new windows and replacement windows. We provide sales and installation of steel doors, fiberglass doors, patio doors, vinyl, aluminum, fiberglass and wooden standard and custom windows, awning windows, casement windows, single-hung windows, double-hung windows, single-sliding windows, double-sliding windows and picture windows, all available in custom shapes and sizes and in a variety of colour finishes. Jefnik Windows and Doors is based in Mississauga Ontario and proudly serves Mississauga, Oakville, Brampton, Etobicoke, Toronto and the surrounding GTA.