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Window and Door Installation

For quality, strength and natural good looks... but most importantly an energy efficient 'A' rated product...look no further with our UPVC- PVCu Windows and Doors, all our units come with double glazing as standard or you could opt for our triple glazing units.

Regardless of the style of property you live in, we are sure to have a perfect solution to meet your design aspirations.

Natural Styling, Elegant aesthetics...

We offer a wide choice of PVCu products either from our classically styled sculptured range or from our more contemporary styled chamfered range. Available in white and woodgrain foil finishes.

We also offer a complete range of aluminium products to complement your home, allowing you the choice of a reliable and attractive product.

Manufactured using aluminium, one of the world’s most sustainable materials, our unique windows offer elegant and narrow sight lines alongside a full range of features, options and finishes.

AluK entrance doors are available in a wide variety of colours, finishes and formats to best complement your home.


Window Energy Ratings (WER)

Our products are now more energy efficient than ever. Less heat loss will also impact positively towards reducing your heating bills, not to mention the positive contribution you will make towards reducing your carbon emissions.

All of our products are manufactured with energy efficiency in mind! That’s why our windows are. 'A' rated as standard.

Don't be mislead... anyone supplying energy rated frames will provide the necessary documentation including the identification of any rating on each frame and also a separate consumer certificate.

At the moment you can only achieve an official rating on Casement Windows and Vertical Sliders. Items such as Doors, Patios, French Doors, Tilt & Turns and Conservatory Roofs are not rated, but are supplied to a U-Value which will comply with current building regulations.

Window Energy Ratings

Stand out from the crowd...

Why not stand out from the crowd by choosing a RAL colour painted finish suitable for both PVCu and Aluminium.

Security in mind...

You will be comforted to know that all of our residential, composite and french doors are fitted with the world’s leading lock brand Yale as standard. Yale products are also accredited with 'Secured by Design'.

Our windows are fitted with only the best performing hardware that has the benefit of a multi-point locking system as standard. These are positioned on the areas of a window that are most vulnerable to forced entry, thus providing a good prevention measure.

A safety feature included on all of our side opening windows is a wide opening fire escape windows that will allow you a quick means of escape in the unlikely event of an emergency. We also offer an optional safety feature which allows for a 'restricted' opening to keep young children safe and secure when indoors.

Triple Glazing

Triple Glazing has been around for many years, but until very recently most triple glazed products have incorporated 28mm thick units. This thickness is more commonly found in double glazed windows.

Durham Design’s triple glazed units are 40mm thick. This dramatically improves thermal efficiency by up to 40% - a real saving in both energy and cash.

As such, this range truly qualifies as being one of the best high performance windows available in the UK and all of our triple glazed windows are backed up by a British Fenestration Ratings Council (BFRC) energy label.

Although many double glazed windows achieve an 'A' rating, the next generation triple glazed windows can significantly improve the energy efficiency of your home even further.

Energy costs will almost certainly continue to rise and according to the Energy Savings Trust, a staggering 26% of all domestic heat loss escapes through windows.

Should we switch to triple glazing?

Now, a U-value of 1.6 may look good when compared to what we have been fitting relatively recently, but compared to the U-value demanded for walls - currently less than 0.3 and due to fall even lower - you can see that windows remain weak spots. Hence the tremendous pressure to improve their performance even further.

The key benefits are really to do with comfort. If you insulate the walls, roof and floor of a house, and you ignore the glazing, you end up with cold spots surrounding the windows at night, which cause draughts, draw heat away from you if you sit next to them, and result in streams of condensation running down the panes. So, in essence, the standard of glazing has to match the standard of the insulation elsewhere in the house, so that the warm wrapping around the house performs consistently.

Which is where triple glazing comes in. Because if double glazing makes a modern house more comfortable to live in, triple glazing makes it even more so.

Think glass...

Durham Design offer a full range of decorative glass options from authentic looking Georgian bar, stained glass, leaded glass, bevelled glass.

Window range...

Casement Windows (PVCu & Aluminium)

Casement windows remain the most popular, practical and versatile solution for replacement windows. And, because each window is tailor-made for your home, you can be creative as you like in design.

Casement windows can be locked in a night vent position for ventilation. In addition to being low maintenance, casement windows reduce unwanted outside noise and offer a draught free, energy efficient solution.

Tilt/Turn (PVCu)

Tilt and Turn windows are specially designed with practicality and functionality in mind!

They enable you to have a quick escape in the unlikely event of an emergency occurring.

The first rotation of the handle will allow the top of the window to tilt back into your room to provide natural ventilation.

A further rotation will allow you to pull the window fully inwards towards you, which will allow you to clean the outside very easily.

Vertical Sliding Sash (PVCu)

Our traditional sliding sash windows offer you timeless elegance associated with this ageless method of window construction, but with a modern 21st century design & technology twist.

Modern-day PVCu also successfully recreates the look of real timber but with all the additional benefits of being low maintenance, being highly secure, incorporating energy saving insulated glass and boasting high performance weather-strips to keep out those unwanted draughts!

Door Range...

Residential Doors (PVCu & Aluminium)

Whether you are looking for a new front or back door, we have the perfect solution within our extensive selection of styles in white, light oak, rich rosewood or painted effect finish.

Composite Doors

These are high security composite entrance doors in an exciting choice of traditional colours or beautiful hand-stained finishes. You will find it difficult to distinguish a composite door from a traditional timber door due to its superior grained finish. Every door has been designed and tested to achieve a high level of security.

French and Patio Doors (PVCu & Aluminium)

Our stunning range of French and sliding patio doors have all the benefits of a window, but with the added benefit of combining elegance and easy access into your home, garden or conservatory.

French doors in particular are increasing in popularity. Not only do they enhance the flow of natural light into your home, they are also manufactured with a high standard of security.

Bi-Fold Doors (Aluminium)

The bi-folding door meets the demands of contemporary living and combines this with beauty and practical functionality. These aesthetically pleasing door panels are configured into a number of concertina folds that can be pulled back to offer optimum versatility, light and access into any room.

Where an opening or partition is required between rooms, whether a small or large room, or where your home leads onto a patio or outside area and you want to extend the view of the garden, the bi-fold door is ideal for these applications. Bi-fold doors create synergy between rooms of all shapes and sizes to seamlessly connect your living space whether indoors or outdoors.

We also cover the following services:

Renovations, conversions, fascis and soffits, block driveways, joinery work, garage doors.

Please contact us for more information and we will be happy to help.

"I am just writing to express our appreciation to Kevin and yourself for the excellent quality of the work carried out by Kevin and Mark to bring our conservatory up to modern standards. Several guests at our party were very complimentary about the changes to the conservatory."

-The Youngs

"Thanks once again for a job efficiently executed to high standards. The conservatory is now full of light, no more polycarbonate. The glass is fantastic!"

-The Youngs

"Thank you and all your staff for a fantastic job. The finish is top rate and far better than we even imagined. Thanks again."

-Martin & Alison

"Please thank Kevin and his team for the superb workmanship when they fitted my kitchen and window."

-Christine Wall (Ferryhill)

"Thank you very much for a beautiful job well done. Thanks also to the fitting team Kevin, Michael and Stuart. They would all make good housewives in the aspects of cleaning windows and hovering up. Thank you all. "

-Lorraine & John Harrison (Ferryhill)

"Please find enclosed a cheque for the final payment for my recently fitted kitchen. Many thanks from my wife and myself for a very good job."

- Mr & Mrs Cooper (Sedgefield)

"Just a quite note to say how pleased we are with the conservatory. Thanks again."

- Ross & Carolyn (Ferryhill)

"We had two cherry PVCu windows installed and a walk in bay built. Thanks to all for a careful job, well done, great attention to detail & everything cleared away afterwards. We are planning on asking Kevin to build wall along driveway, and thinking now about bedroom windows in cherry PVCu at a later date. Cheers."

- Jan & Tony (Durham)

"Once more I need to congratulate you on another job well done. Over several years of dealing with yourself I have always been more than satisfied with your work. It seems to me it always has that extra quality that typifies a craftsmans touch and care. I would recommend Durham Design without reservation to anyone."

- Peter Dobbing (Mainsforth)

"The quality of workmanship is excellent, and our new Sky-pod and bi-folds have transformed our existing flat roof extension."

- Lloyd (Yarm)