Renka Window Systems

Upgrade your windows with strong, versatile aluminium windows to create a stylish look that is built to last. Aluminium is strong, lightweight, and available in a large range of colours and finishes, allowing us to create the perfect combination of fixed and openable windows to suit your property.

Whether you are building your dream house, designing a new extension, adding roof windows, or simply fitting new windows for a contemporary look, our made-to-measure systems will be designed to meet your specific requirements.

Choice is the keyword with our window systems. Choose between contemporary, heritage, slim profile or flush casement styles. Choose from a wide range of colour options and a wide range of hardware styles. Decide whether you want your windows to be fixed, openable or tilt and turn, and let your imagination run free with shaped frames and gable glazing.

If you’re looking to blend in with existing UPVC windows, discuss with us our bespoke ranges of flush casement, sash and traditional UPVC window styles.

Choosing the right window system

for your house is an important step. Window colour, style and configuration are all important to give your house the look that is appropriate for your and your neighbouring properties.

To help you choose the right window for your project, we’ll look at the style of your property, the size of the windows and whether you want them to be fixed (non opening) or opening. Whilst slim profile / slim framed window systems are often high on customers’ wish lists, if you’re looking for side or top opening panes, slim profile windows don’t necessarily offer the structural strength or size of traditional / wider profile windows.

The visual style of windows

is also something that we will ask you to consider – whether you’re looking for the contemporary styling of the AL 600, the unobtrusive flat profile of the AL 47 or SL 68, or the internal and external flush casement of our Origin windows.

Should the project budget be a challenge, we can also offer a range of UPVC casement and sash windows – all of a very high quality, but at a slightly lower price point than our aluminium window ranges.

Renka window product range


A slim profile contemporary casement window system with Reynaers engineering.


RW-AL47 Heritage
A slim profile and flat fronted window system. The system can be used in conjunction with astragal bars delivering “Critall-style” appearance.


A well engineered and robust window system that can support larger windows and is available in a wide range of colours at no additional cost.


Origin’s beautiful flush casement aluminium window – offering a huge choice of colours and hardware, and backed up with Origin’s 20-year guarantee.


A high quality flush casement UPVC window in a wide range of finishes.


Fixed (non-opening) and shaped frames are available in all our window systems to ensure a cohesive appearance across a project.

Site survey

The site survey is an important stage in ensuring that the installation of your glazing goes smoothly and is co-ordinated with your overall build. At the site survey, one of our lead surveyors will meet with you and your builder and/or architect.

 As well as taking measurements of the manufacturing sizes of each product, we will discuss important details such as the final finished floor level, the positioning of products within reveals, the cills on the windows, and the threshold you’re aiming to achieve on sliding, bi-fold and pedestrian doors.

 The site survey also allows the opportunity to discuss any remaining open points and to agree any actions required in advance of the Installation

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