Energy Efficient & Security Windows

All of our windows are energy efficient

Peaceful & Warm

The British Fenestration Rating Council’s ‘Window Energy Rating’ scheme calculates the overall energy efficiency of windows. It has given consumers an easy way to distinguish between the top energy saving A-C rated windows and less eco-friendly alternatives.

Moisture is a breeding ground for bacteria, so reducing condensation is extremely good news for people who suffer from respiratory conditions, such as asthma. With Heatguard® thermal bridging is all but eliminated, resulting in a massive 70% reduction in condensation.

70mm PVCu Frame

Multi-chambered PVCu 70mm casement profiles. Providing very low levels of thermal transmittance (U-Value) together with minimal air leakage (Pa pressure).

Designed by a leading European company providing polymer solutions,throughout the world. Heatguard® products also incorporate the very latest in security with internal beading & high security locking mechanisms.

Low E Glass

The use of coated insulating glass, resulting in low surface emissivity, with lower levels of thermal transmittance compared with traditional glazing. It reduces the amount of heat loss out through your window, whilst allowing heat (energy) from the sun in. This effect is known as solar gain and as it comes from the sun its free of charge. Our warm edge sealed units are 28mm wide leaving a 20mm cavity which is filled with Argon, an inert gas thermal ‘blanket’. Your home automatically feels warmer without the need to turn up the heating.

Warm Edge Spacer

Innovative warm edge Super Spacer® a non-metal solution. This extruded organic EPDM, spacer includes a 10 layer vapour barrier and a dual seal structural adhesive. It provides the ‘back-bone’ of our high performance insulated glass units. With vastly improved thermal efficiency, they also deliver better sound proofing, dramatically less condensation and longer life expectancy than more traditional metal spacer bars.

What are the benefits?

Reduce Fuel bills

HeatGuard® Energy efficient windows cut heat loss through windows, and can reduce fuel bills for householders by up to 25% a year. Just from reducing the running time of your heating system and locking in thermal energy, you can achieve warmer, healthier housing for the same or less expense.

Noise Reduction

Up to 2dB in Noise Reduction - Installing HeatGuard® energy efficient windows can significantly improve the sound quality in your home. With high-performance glazing, sound resistance is enhanced and a higher quality of air, noise and light filtration achieved - ultimately providing you with a more comfortable internal environment.

70% Reduced Condensation

70% Reduced Condensation - By making homes wind and weather tight, you can achieve higher internal temperatures that reduce damp and condensation. HeatGuard® energy efficient windows make the best use of heating and ventilation systems, making your home a more comfortable place to live.

30% Longer Lasting

Windows are in place for a long time, so the efficiency gains you will enjoy by fitting high performance windows are permanent. HeatGuard® energy efficient windows perfom to much higher standard than traditional products, which means less maintenance and better durability.

Would you like to see our range of brochures?


Our products are fitted with our unique range high security locks and handles. Purpose designed and sourced in the UK.

Probably the most ergonomic designs available in our market today, meet the strict criteria of British Standards for enhanced security.

Download and read our brochure to find out more.


Security Brochures


Why Choose Us?

Price Match Guarantee

Our Price Match Guarantee means we will match any like for like quotation with the same features, specifications and warranties.

All Seasons Living

Combine the light and airy feel of a conservatory, yet with the solid, tiled roof, and energy efficiency of an extension.

Over 50 Front Doors

We have a wide range of over 50 white, coloured & woodgrained Front PVCu and Composite Doors to choose from. Starting from just £645.

FREE Quotation

Whatever your requirements, please contact us now for a comprehensive FREE no obligation quotation, or just for some friendly advice.

Best Price Promise GUARANTEE*

*Provide us with a Like for Like quotation with the same features, specifications and warranties from a comparable company,and we will match the PRICE.
Call us on Now 01403 711 936

Do you need a quote?

Contact us now for a comprehensive FREE no obligation quotation.


Established in 1998, Window Mart have gone from strength to strength culminating in the opening of our new show complex at Old Barn Garden Centre near Horsham. All Window Mart staff are employed by the company and drive fully equipped company vehicles. We have our own building team for groundwork and brickwork. In our showroom an extensive range of conservatories, doors and windows can be viewed. Excellence is our commitment and we are here to make sure you get the very best in service and quality.

Contact Us

01403 711 936

Show Complex

Old Barn Garden Centre,
Worthing Road, Dial Post,
Horsham, West Sussex,
RH13 8NR

Opening times:
Mon -Sat: 10am – 4pm
Sunday: 11.30am – 3.30pm

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