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Energy Efficiency- Thermal performance.
We can advise you on the most energy efficient solution for your home. Our standard windows are A rated in energy efficiency, which will help you to save money on your energy bills at a time when prices are constantly rising. With the Energy Saving Trust estimating that up to 26% heat loss from homes is via poorly insulated windows, our A rated solutions easily justify our claims that they should be seen as an investment and not a cost.
And, if you want the optimum in energy efficiency, then we have a range of triple glazed windows available which are among the most efficient A Rated windows on the market in Northern Ireland.
A++ Triple Glazing
Energy efficient glazing units feature energy reflecting glass as standard, which maximises heat gain by retaining interior warmth and transmitting solar energy from outside. Thermo spacer bars connect the glazing panes, helping to eliminate cold areas at the edge of the unit, reducing condensation.
Upgrade Your Existing Windows
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.
Visit us
Mon-Friday-8am-4:30pm
Call us
Mon-Friday-8am-4:30pm
+44 (0) 2871 357 555
Contact us
New uPVC windows
Frames & Glazing 
Frames are designed with multiple internal chambers within the profile system. Each chamber acts as a barrier against heat loss from inside the home and against cold air entering from outside, ensuring excellent thermal efficiency.
U-Values
U-values take into account all components of the window including the frame, glass and spacer bar; therefore the lower the U-value, the more energy efficient
the window.
Our double glazed windows offer U-values of 1.4 W/m2K as standard (‘A’ rating),
with the option to reduce the overall U-value to 1.2 W/m2K. By selecting the triple glazed windows, featuring Soft Coat Xtra and Argon gas, you can further reduce the whole window U-value to only 0.8 W/m2K. Camden windows are independently tested and certified, and exceed building regulation requirements for energy efficiency, which can be beneficial if renting or selling a property
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.
Upgrade Your Existing Windows
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.
Visit us
Mon-Friday-8am-4:30pm
Call us
Mon-Friday-8am-4:30pm
+44 (0) 2871 357 555
Contact us
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.
Our extensive product range includes double and triple glazed PVCu frames, residential doors, door panels, composite doors, patio doors, french doors and conservatories. Our customers demand the best and we strive to provide it through our commitment to quality.
We supply and installs a wide variety of glass and glazing services right across Northern Ireland.
From traditional casement windows to shaped frames; elegant vertical sliders to convenient and practical tilt and turn windows; super strong and high security double rebate composite doors to beautiful, outdoor living and space creating bi-folds, we offer a solution to every situation.
Every product is specially made to your requirements – size, style, colour, finish, configuration, ensuring customers get a world-class product that adds value to their home.
All our products are designed and manufactured to deliver superior energy efficiency, strength, durability and security, and come with unrivalled guarantees, giving you total peace of mind.