Crown Casement Windows

Capital Windows have over 40 years experience manufacturing and installing an exceptional range of windows, doors and associated products. Whatever the project, we have the right approach and materials for the perfect finish.

SAPA Crown Casement Window Systems

The SAPA Crown Casement Window system is a quality and established window system suitable for replacement or new build applications. Capital Windows are one of the longest established and experienced manufacturers and supplies of the SAPA range of windows.

Crown Casement windows are available with either contemporary or traditional profiles to meet the requirements of all types of homes and properties where a quality, tried and tested window is required.

Crown Windows Are One Of The Leading Residential Window Products Available Today

The SAPA Crown window is also the ideal replacement for older Monarch or Monaframe aluminium windows where you may be looking to add to your original Monarch windows and are looking for the most suitable like for like replacement.

You will find Crown casement windows ideal for any kind of window replacement or where windows are required to new build homes, home extensions.

Range of frame sizes & styles | Range of opening sashes

Our traditional profiles are available in a range of outer frame sections of differing sizes and styles.  Opening sashes are also wide ranging from chamfered or ovolo sections, to flat and slimline.  A range of window mullion and transom sections also adds to the versatility of the system.

sapa doors and windows

SAPA Crown 52mm System

This is the ideal window if you are looking for new windows to fit into existing hardwood or stone surrounds. It is important to use the correct window system where old metal windows need replacement.

With slim profiles being a key feature of older windows, the Crown casement window system ensure original sight lines are matched as close as possible giving you a suitable replacement for older or metal windows.

Crown 75mm System

The 75mm system is a direct fix window that is suitable for any type of window replacement.

A range of ancillary profiles are available that enable the Crown Window system to create bay or bow windows, shapes and angles as well as coupling to doors or screens.

Features Of The SAPA Crown Window System

Any window design can be achieved through the wide range of profiles available. The aluminium profiles utilise sophisticated thermal break technology that in conjunction with our range of high specification glass provides a window with excellent thermal characteristics.

Quality seals and gaskets ensure that SAPA Crown Windows meet the highest standards of weather performance and compliance with current standards.


  • Top hung, side hung or fixed light windows are available
  • Patented security bead design meeting current security standards
  • Excellent weather performance meeting severe exposure ratings
  • A wide choice of sections for traditional or modern aesthetics
  • High quality polyester powder coated finish available in over 200 colours
  • Different colours are available inside and out to create dual coloured windows
  • A highly secure window

We use high specification double glazed units with superior thermal insulation including ‘soft coat’ low emissivity glass, argon gas filling and thermally broken spacer bars. These features ensure that our Crown Casement windows offer excellent thermal properties and energy efficiency.

A Range Of Colour Options

One of the advantages of modern aluminium systems is the wide variety of colour on offer.  Capital Windows can provide over 200 RAL, Syntha Pulvin or BS colours.  Gloss satin and matt finishes are available including metallic shades or dual colour windows.

Established in 1979, Capital Windows Ltd provide the biggest choice of home improvement products from the leading names and systems companies.