The SAPA Crown suite of casement windows is a high quality range of aluminium windows designed for direct fix or new build applications.
The Crown Casement Window System is the ideal replacement for the now discontinued Monaframe range of windows previously supplied by Monarch Aluminium. These offer very similar profile dimensions and features as the original Monaframe Windows and Doors. If you previously had Monarch Monaframe windows fitted and would like to add to these existing windows, SAPA Crown are ideal.
SAPA Crown Aluminium Windows.

SAPA Crown are one the best known and respected brand of aluminium windows in the UK.
SAPA Crown Windows are one of the best known brands of aluminium windows in the UK. The SAPA name has been established in the UK market for well over 25 years. Northwest Bifolds expertly install these quality replacement windows and doors that provide homeowners with a comprehensive range of windows to suit any kind of domestic property.
Advantages of SAPA Crown Windows.
Our range of Crown windows offers a wide choice of window styles, frame options and window types. They are firstly ideal for any replacement window application. Offered in a choice of square-line, profiled, chamfered or ovolo frames, this means they can match the needs of both traditional and modern homes.
Also available are a range of ultra slim frames and opening vents making them ideal for the replacement of steel windows. If you presently have old metal windows in your home and are looking for a slimline alternative, we recommend SAPA Crown.
Windows offer excellent levels of thermal performance thanks to their sophisticated polyamide thermal breaks. The advantage of polyamide is that not only does it substantially improve window performance but it also enables different colours inside and out.
Maximum Security with flexible design options.

Our high quality Crown Windows feature the latest in multi point locking systems for peace of mind.
The SAPA Crown Casement Window is a modern solution for anyone seeking a tried and tested, ultra reliable window in their home.
All SAPA Windows come with high quality multi point locking systems with shoot bolt locking and robust high security locking handles.
Advantages of SAPA Crown Casement Windows.
For the replacement of slimline metal windows and old steel windows, we offer the Crown 55mm system. This is ideal as a steel replacement system and is also the ideal window if you wish to fit windows to either hardwood or stone surrounds.
For new build and other standard replacement window installations North West Bifolds offer the 75mm Crown system. This is a fully versatile suite of windows available in unlimited styles and designs.
Flatline profiles with square outer frames complement the more modern home and especially when used in conjunction with the various flat vent options available.
For the more traditional look we offer the profiled suite of sections such as chamfered and ovolo profiles that can be a great replacement for original timber windows.
Your local SAPA Windows Experts.
North West Bifolds have over 20 years experience in aluminium windows and we are confident no other company knows or understands aluminium windows better.
Contact us for a free, no obligation quotation if you are looking for the latest generation in residential aluminium windows.
We also offer aluminium windows from other leading ranges meaning we are your local home improvement Company to give you the benefit of our expert advice and experience. Let us help you choose the best aluminium windows for your home.