Triple Glazing can be over 40% more efficient than Double Glazing
Triple Glazing in Cumbria, Northumberland and Dumfries & Galloway
Homeowners across the UK replace their windows every week, most choosing double glazing as the standard upgrade. However, for homes in Carlisle, Cumbria and Dumfries & Galloway, triple glazing is often the smarter choice.
Triple glazing can be over 40% more thermally efficient than standard double glazing.
What is Triple Glazing?
Triple glazing uses three panes of glass instead of two. Two panes feature specialist low-emissivity coatings to reflect heat back into the home, while two warm edge spacer bars and argon gas-filled cavities work together to significantly reduce heat loss.
While double glazing remains the most common option, triple glazing offers enhanced thermal performance, making it particularly effective for exposed locations, older properties and homes where energy efficiency is a priority. Some homeowners consider secondary glazing, but a well-specified triple glazed window delivers superior insulation and long-term performance.
Quality you can Trust
Not all triple glazing performs the same. Some suppliers cut corners with low quality components that fail to deliver genuine efficiency gains.
At World Group, our triple glazed windows are carefully specified, manufactured and professionally installed to ensure excellent thermal performance, durability and reliability.
Triple Glazing Top Tips
There are hundreds of glazing products available across the UK. Some are manufactured locally, some sourced from large national suppliers, and others imported from overseas. With so much choice, making the right decision matters.
At World Group, we believe replacement triple glazing should be an investment, not just a purchase. The right product should reduce heat loss, lower energy bills, add value to your home and enhance its appearance. Follow our top tips below to make sure you choose a triple glazing solution that genuinely delivers.
1. Choose the right company
Do your research. Look for a trusted triple glazing installer that is FENSA registered (or equivalent) and has a proven track record. Accreditation helps protect you and ensures work meets industry standards.
2. Ask where the windows are made
Companies that manufacture their own products often have greater control over quality and consistency. This can result in better performance, improved reliability and closer attention to detail throughout the process.
3. Understand what makes the product better
Ask how the triple glazing compares to what you currently have. Key questions include:
What are the U-values? Request documented thermal performance figures.
What low-emissivity coatings are used on the glass?
Are warm edge spacer bars included to reduce heat loss?
What colour and finish options are available? Always view samples before deciding.
4. Check who installs the windows
Find out whether installation is carried out by employed installers or subcontractors. Dedicated installation teams are typically more consistent and careful, helping to ensure a high-quality finish.
5. Be realistic about installation time
A professional team will usually install and finish around five average windows per day to a high standard. If a full house of triple glazing is promised in a single day, quality may be compromised.
6. Know what you’re paying for
Ask about guarantees, aftercare and long-term support. A quality triple glazing product should come with clear warranty coverage and a company that stands behind its work long after installation.
If you’d like advice or a no-obligation quotation for triple glazing, call our team on 01228 599777 or 01387 249777. We’re always happy to help you make the right choice.
Can I upgrade my existing double glazing to triple glazing?
In some cases, yes. It depends on the age of your windows and who supplied them originally.
Existing World Group customers
In recent years, World Group has manufactured double and triple glazed window systems designed to allow an upgrade by changing the glass and glazing bead only.
If your double glazing was supplied by World Group within this period, it may be possible to upgrade to triple glazing with minimal disruption, without replacing the entire window frame.
Other window systems
If your windows were supplied by another company, or are older, an upgrade may still be possible. Where the existing profile system is compatible and the correct glazing bead can be fitted, we can sometimes replace the glass and bead to improve performance.
Glass thickness options explained
Our highest-performing option is 44mm triple glazing, which uses two 16mm airspaces and warm edge spacer bars to deliver excellent thermal efficiency.
We also offer a 40mm triple glazing option, which uses two 14mm spacer bars. Both the 40mm and 44mm units achieve the same U-value, although the 44mm option provides the most robust overall construction.
A 28mm triple glazing option can sometimes be used in older systems, but this does not deliver the same level of thermal improvement as our 40mm or 44mm systems.
Every home is different. We’ll assess your existing windows and advise whether upgrading the glass is suitable, or whether a full replacement would deliver better long-term results.
Triple Glazing in Cumbria, Northumberland and Dumfries & Galloway
For our customers in Cumbria, all triple glazing installations are covered by our own guarantee and a 10-year insurance-backed guarantee. As a FENSA registered installer, we are able to self-certify our installations, removing the need for building control to visit your property.
For customers north of the border, building control certification is not required under current regulations. Our team will be happy to explain the process and answer any questions you may have.
Gallery: Triple Glazing in Cumbria
Double Glazing
Explore what our Double Glazed products can offer you.
Double vs Triple Glazing
Compare both of the options - Double and Triple glazing.