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New windows are an investment, and we're here to ensure you make all the right decisions for your home. Double-glazed windows are a modern day essential and, alongside style, new windows improve energy efficiency and security. Whether you are modernising with casement windows, restoring your home with timber sashes,we offer you exceptional quality. Our skilled team of engineers have decades of experience and will install your home improvements with utmost care and to the best standards.

UPVC Windows

UPVC Windows

The most popular product within the window industry due to its thermal efficiency, built from high-impact uPVC constructed to UK building regulations, external uPVC windows keep the cold out and stop heat escaping, As there is less thermal expansion, draughts and leaks are all but eliminated. 

Durable Functionality that is often not seen in traditional materials such as metal or wood. This very same material is built to last and virtually maintenance free.  The wipe clean finish of uPVC makes them a practical choice for busy households.

It is also the most cost effective solution to replacement windows. Our A Rated Upvc windows come in a range of colours and finishes in to customise or compliment the look of your home to add real curb appeal.

Aluminium Windows

Aluminium Windows

Improvements in the aluminium window industry mean that it can now rival Upvc in terms of thermal efficiency and whilst a little more expensive than upvc is now more affordable than ever.
please contact our office to arrange for brochure with the complete range of styles and colour options available.

Wooden Windows

Wooden Windows

Wood has been the most reliable product for the window industry for centuries and whilst a lot of the wooden windows have now been replaced with upvc or aluminium, there is still a large demand for wooden windows. with  modern seals and mechanisms the wooden window system is just as draught and weather proof as any other window product.

New Windows are a smart choose for improving your home.

Heat loss can be measured by either thermal transmittance or U-value. The lower the U-value, the better the thermal insulation. In 2006, Window Energy Ratings (or WERs) were introduced  for calculating the energy efficiency of different windows. Ratings are awarded from A+ to G, with an A+ rating indicating the highest levels of energy efficiency.

Current minimum building regulations require either ‘C’ rated windows or a ‘u’ value of 1.6 or lower. Make your home warmer by upgrading to an ‘A’ rated window or improve to a ‘u’ value. Windows play an integral role in creating an energy efficient home and situated in the right spot, they will help maintain a comfortable home, once installed our high-grade low emissivity windows will ensure your home stays cool in the summer and warm in the winter.

Saving you money on your energy bills by keeping the heat inside your home.
Up to 20 percent of the home’s heat can be lost through its windows, particularly if they are poorly installed or single glazed. Over time, this can result in a substantial increase in the cost of heating your home. Installing energy efficient windows, or making the home improvement for replacing the glass with double glazing is great decision.




We offer a range of stylish double glazed and energy efficient window systems to compliment your home. All offer a high gloss finish, slim sight lines and the highest possible thermal and acoustic performance. Our uPVC window systems include; casement windows, bay windows, windows that tilt and turn and heritage style sliding sash windows. All of these styles no longer have to be just white, you can now choose colour windows.

  • Modern high performance systems creating more comfortable rooms and cost saving.
  • Less condensation – energy saving trust advice.
  • Low maintenance and high durability. our products are almost care free.
  • More secure with robust security measures.
  • Reduces your carbon footprint by improving your energy efficiency.

Burglars usually gain entry to your home through a window or door. So you’re windows security is high on the agenda. it’s important for you to select windows with adequate locking devices. You also need to think about the window itself – the frame must be of high quality and able to withstand hard knocks.

Windows offers the Espagnolette locking system, an extremely robust multi-point lock that offers exceptional security. When locked, your door or window will bolt itself into the top of the frame and the floor, as well as at the handle, giving it even structural strength throughout. Any would-be burglars would have to attack the lock at all points to gain entrance, delaying their attempts until the alarm is raised.

Making your home quieter with increased insulation which means less outside sound can enter – ideal if you live near busy roads or schools.

Upgrade Your Existing Windows

Why Choose APG as your windows installer in Derry

Having worked in the glass industry for well over 35 years we have a depth of knowledge that can help you in your home improvement of any size. we specialise in ALL ASPECTS of glass and glazing.

At All Purpose Glazing our ultimate goal is leaving all our customers more than satisfied. We ensure our glass is of the highest quality, meeting and exceeding all relevant Building and Energy rating regulations.

We supply and installs a wide variety of glass and glazing
services right across Northern Ireland. 

Call us


+44 (0) 2871 357 555

About us

One of Ireland oldest glaziers, A  family run business with care  for  customers at the  heart of our business. providing a comprehensive range of glass and glazing products, design and installation services; workshop facilities, as well as in-house installation and servicing teams. We are based in Derry City but have supplied and installed glass all over  Ireland. 

Our mission

Involved in all aspects of glazing, we are the region’s leading glazing provider.  Our drive to provide great service is reflected in our work.

Our staff are all time served accredited glaziers with vast experience to ensure that every job is completed to the highest standard. Your staff are here to help with any glass or glazing enquiry you may have.

Our offer

  • Care & Attention To Our Customers
  • Full Range of Glass Stock & Glazing Services
  • Cost Effective Experienced Trade Supplier

We are dedicated to providing a complete range of glazing products, installed by our in-house teams of experienced and qualified fitters.

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