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Energy Efficient Secure Windows

Horizon not only offer the highest quality energy efficient window system available in the UK but a a high secure window with a yale locking system and hinge device that withstands twice the force required by Secured By Design testing
Designed for the more discerning client who appreciates the fact that quality does cost that little bit more.
The extra investment made goes towards the product with installation cost remaining the same. Why not give your home a facelift along with saving energy costs. 
Become maintenance free with a choice of triple or double glazed window systems that come in different styles and colours to match your home.
On top of all this you can feel more safe in your home as our windows are secure by design and pass the most stringent test by having the latest locking system available in Europe.

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Energy Efficient Windows

Attention to Detail

Full Window Design Service

Expert Service

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French Doors

Let The Light In

Rated For Energy Efficiency Performance


Thermal Transmittance

Otherwise know as a U-value this is a measurement of how good a particular window is at preventing heat from escaping from your home. The lower this value is the better the product is at preventing heat loss.

The Horizon window system is a leading performer.

We take energy efficiency very seriously as energy assessors and will do our utmost to provide the correct window system for your home.

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Solar Factor

Otherwise known as the G- Factor this factor is a measurement of the heat that is gained simply from sunlight passing through the glazing. The value will be higher the more transparent the glazing is. For different applications this can make for an interesting decision of use.

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Air Leakage

Otherwise known as the L-Factor his measurement is simply how air tight the window system is from the outside and has an obvious correlation to heat loss - lets stop those draughts.

Horizon window system comes out again as an outstanding leading performer.

A little taste of the style and design of our windows

Better For The Environment

Endorsed By The Energy Saving Trust

Horizon install 20 year guaranteed British made thermal efficient window system BFRC approved.
The system is capable of achieving a window energy rating (WER) ) of A +12 or a U Value of 1.0 W/m²K with triple glazing.
This rating is the highest level of energy efficiency.
Our windows are fabricated with multi chambered lead free profiles with integrated reinforcing and superior gaskets and designed to Passivhaus.
Having our windows installed in your home will reduce the amount of energy you would use and on an average home could lower you CO2 emissions by approximately 2/3 of a tonne (680kg) each year.

Colour Your Life

UPVC frames for conservatories are the ever popular favourite with the todays modern homeowners. It’s virtually a fit and forget product requiring very little maintainance throughout the duration of its very extensive lifespan. The thermal efficiency performance of UPVC is a great benefit and the colour options available now are extensive.

Beautiful Sightlines

Special Windows

Flush sash windows are the latest exciting development from Horizon. They offer the realism of a traditional pre-1932 timber window combined with 21st century thermal benefits.
Many property owners require a traditional timber window frame, sometimes due to planning or environmental restrictions.
Timber frames tend to be expensive, need regular maintenance and can be difficult to replace.
Horizon recognised the need to develop a casement window frame that would fit into any property where the sash fitted flush into the frame – and which could be foiled to look like traditional timber or to offer a sleek, contemporary finish.
These sash windows are available in cream, white or woodgrain. 
Horizon also offer tilt and turn windows, sash windows with horns and even arched windows along with fully balanced profiles giving the beautiful sightlines.

Fully Balanced


Georgian Bar Sash


Georgian Tilt & Turn

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The Choice Is Yours

A Closer Look At The Sash

We offer Heritage Sash Windows with a range of options from colour, handles. spacer bar, and other detail to suit your home.

Our PVCu Sash Windows are available in 9 standard colours from smooth white to 8 woodgrain options.

The woodgrain colours can be foiled on both sides or one side with a smooth white interior.

If our standard colours don’t quite match your vision then do not worry as we’re able to offer over 200 RAL colours using our colour bonding facility.

Pattern Your Glass



  • A rated double and triple glazed beautiful looking windows 

  • Any colour PVCu window frames, guaranteed not to discolour for 20 years

  • Optimum performance - 28mm double glazing with our triple glazed systems using 12mm air gaps

  • Secure by Design multi-point locking system, internal beaded keeping you and your family safe in your home

  • Made to measure for a and perfectly installed and guaranteed for 20 years


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