Southern Window Systems UK is an established and reliable double glazing company based in Hastings, East Sussex. As a family run business, we take great care in ensuring our customers always receive that personal touch.

We are proud of our friendly, professional and helpful team here at Southern Windows Systems as we know we can offer you guidance and assistance with any of your double glazing requirements.

There are unlimited options available with our stunning Liniar double glazing for homes in Hastings and St Leonards on Sea, East Sussex. Whether you’re adding valuable space to your property with a beautiful conservatory, creating a welcoming entrance point with a new composite door or upgrading your uPVC windows to include the latest A+ Windows Energy Ratings (WER); Southern Windows systems UK have everything you’re looking for.

We offer free home visits and free surveys to homeowners in East Sussex looking for that special home improvement. Each and every double glazed product we install is tailor made to meet your specific requirements so you will always receive exactly what you want.

Trusted Double Glazing Network Member

Southern Window Systems UK Ltd are proud members of the Double Glazing Network. Based in St Leonards on Sea in East Sussex, we operate as the leading Liniar installers in that area of the UK. The Double Glazing Network has been set up by TruFrame, Britain’s principal manufacturer of Liniar’s uPVC profile.



Being part of the Double Glazing Network means you will benefit from a number of advantages when choosing your local double glazing installer. Each double glazed item comes with Yale’s high security locking systems as standard, a complete manufacturer’s guarantee and Liniar’s unique multi-chambered profile.

All Double Glazing Network members are reliable and trustworthy, being fully vetted and approved. Southern Window Systems UK are accredited members of Certass who are the specialists in installer certification for the double glazing and home improvement industry.


Southern Window Systems UK Ltd are proud members of the Double Glazing Network. The Double Glazing Network is designed in order to make the perfect supply chain. Taking every care and attention to provide the number one window system in the UK to all of our customers.

We only ensure we supply and fit the very best to our customers in East Sussex. This is why we have chosen Liniar as our trusted manufacturer. They are recognised as the most technically advanced and innovative company in the whole of the double glazing industry.

Certass is a government authorised Competent Persons Scheme for the replacement of both windows and doors. As a Certass registered company, our customers are guaranteed deposit protection as well as an insurance backed guarantee.

High security comes as standard. As an approved Double Glazing Network member, we are also part of the Yale approved installer scheme. You can be confident with the security of our product, installation and aftercare.

The Energy Saving Trust is in place so all our customers know we are a certified installer of energy efficient windows. All our products are subsequently authorised to display the Energy Saving Trust Recommended logo.

The BFRC (British Fenestration Rating Council) is the industry standard for energy & thermal efficiency ratings.  All uPVC products we install are A rated for energy efficiency, providing you with peace of mind in the long term.

Fully CE Certified

Here at Southern Window Systems UK, we can proudly say that we are fully CE certified for all of our double glazing products and services.

You can view our certificate of accreditation here.


Our company have built a quality reputation as one of East Sussex's leading double glazing companies. As a trusted and professional installer of beautiful windows, doors and conservatories in the area, our outstanding workmanship and customer service is why people return to us time and time again.