When researching new windows, you’ll often see terms like A-rated, energy-efficient, or high-performance. But what does an A-rated window actually mean, and why does it matter for your home?
Understanding Window Energy Ratings
Window energy ratings in the UK are measured on a scale from A++ (most efficient) to G (least efficient). An A-rated window meets strict standards for thermal performance, helping to reduce heat loss and improve overall comfort.
These ratings take into account:
- How much heat the window keeps inside
- How well it prevents cold air entering
- How efficiently it manages solar gain
- The overall U value that it can gain
In simple terms, an A-rated window helps your home stay warmer in winter and more comfortable year-round.
What Makes a Window A-Rated?
A window doesn’t earn an A rating from glass alone. It’s the combination of:
- High-performance double or triple glazing
- Low-emissivity (low-E) glass coatings
- Argon or similar gas fills between panes
- Warm-edge spacers
- Well-designed, insulated frames
When all these elements work together, the result is a window that dramatically reduces heat loss.
How A-Rated Windows Save Money
Older windows allow heat to escape, forcing your heating system to work harder. A-rated windows reduce this heat loss, meaning:
- Lower heating bills
- Fewer draughts and cold spots
- A more consistent indoor temperature
Over time, the savings on energy bills can make a significant difference, especially with rising household energy costs.
Comfort Beyond Energy Efficiency
A-rated windows don’t just save money — they improve how your home feels. Rooms become warmer, quieter, and more comfortable, particularly during colder months.
Choosing the Right Specification
Not every home needs the same setup. Admiral Homespace helps homeowners choose the right window specification based on property type, location, and budget — ensuring you get genuine efficiency improvements without unnecessary expense.
We’re Federation of Master Builders Accredited
The Federation of Master Builders has been instrumental in leading the campaign for safer window treatments in the UK via its Make it Safe campaign.
to about 70% satisfaction. The installers were contracter’s that had no commitment to what they were doing and it showed. We needed a new set of patio doors, thinking here
we go again going to get another job done that I know I won’t be overall happy with. I passed Admiral Homespace by chance, popped in had a chat with one of the sales team
who was not a cheesy sales guy in fact nice and pleasant to talk with (good start). We arranged a site visit he came over I explained what I was after which was to limit the
amount of surround and centre join of the doors he offered me a new to the market product that gave a centre join of 20mm and minimal surround. To cut a long story short,
bought the product it has been fitted by an excellent team who are employed with the company so have vested interest in doing a good job which they did. overall from sales
to surveying to organising and fitting the whole team are excellent very professional and actually care, the fitters Andy & Wayne look genuinely pleased with the doors and the
fact I was so pleased. I would highly recommend them looking to get new windows fitted so am going back to them. Happy to pass on pictures to them to forward to potential
customers’
a very helpful sales process. We were able to move at a comfortable pace, arriving at the final solution, in a timely but very professional manner. All trades conducted themselves
in a very professional manner, on time and as described. Even late changes were accommodated without issue, we would have no hesitation in recommending Admiral and their
comprehensive professional approach throughout
Admiral installed our doors and windows in 2012. In 2026 our front door lock broke and the manufacturer didn't make them anymore nor had any spare parts !
Nadine and Andy road to our rescue. Andy researched a potential fix, Nadine ordered the parts and Andy promptly repaired our lock mechanism and then installed it back in the door.
Absolutely super service and support - even years after our initial install!
Admiral Homespace care for their customers !
and professionally and customer service is really important to me, particularly when I'm making a substantial purchase. I had a slight issue with the lock on my door and an engineer visit was arranged quickly and efficiently. The matter was resolved in a few minutes with a few adjustments. Very happy with the service.’
Installation went well and we are very happy with the result.
I'd definitely recommend Admiral Homespace to anyone looking for custom, handmade windows & doors for their project.
