If you are trying to lift your home's energy score, glazing is an obvious place to look. New windows can help your EPC, and because uPVC doors and windows save energy across the whole home, they often nudge the rating up. How much depends on your property, so let us look at what really moves the needle.
An Energy Performance Certificate rates a home from A (most efficient) to G (least), based on things like insulation, heating, glazing and how the whole building holds heat. It is used when you sell or let a property, and landlords in particular need to meet minimum standards.
The assessment looks at the fabric of the building, so windows and doors count, but they are one factor among several. Loft and wall insulation, the heating system and controls all feed into the score too. That is why new windows alone rarely transform a rating on their own, but they do contribute.
Efficient windows help an EPC in a few connected ways:
The biggest jump comes when you replace old single glazing, because you are closing a large gap in the home's efficiency. Upgrading fairly recent double glazing gives a smaller improvement, since the starting point is already decent. Our uPVC window range is built to perform well on exactly these measures.
It is easy to focus on windows and forget the doors, but a draughty old door leaks heat just as a window does. A modern insulated door with good seals and a solid core adds to the picture, which is part of why uPVC doors and windows save energy together rather than in isolation.
If you are updating the front of the house, doing doors and windows as one project often makes sense, both for the look and for the combined effect on comfort and your energy score. Our uPVC door options pair naturally with new windows.
Here is the honest part. New windows help, but the exact points added to an EPC vary from home to home, and any specific figure would be a guess. An assessor uses standard assumptions, so two similar homes can score differently depending on the rest of the building.
If lifting your EPC to a particular band is the goal, for example to meet letting requirements, it is worth getting an assessment first to see where the easy gains are. Sometimes loft insulation or heating controls give more points per pound than glazing. Because the rules and minimum standards change, check the current requirements for your situation with a qualified assessor or your local authority.
Even where the EPC gain is modest, new windows earn their place in other ways. You get a warmer, quieter, more comfortable home, less condensation and better security. Those day to day benefits often matter more to how a home feels than the certificate number does.
And if your existing windows are basically sound, with only a misted unit or a failed seal, a repair can restore performance for far less than replacing everything. We will always tell you honestly when that is the better call.
As a rough guide for 2026, supplied and fitted uPVC windows commonly run from around £450 to £1,200 each and doors from around £900 to £2,000, depending on size, style and glazing. Prices vary, so ask us for a quote for figures that suit your home.
They can, especially when you replace old single glazing, because the assessment rewards lower heat loss. The exact improvement varies by home, as windows are one of several factors in the score.
There is no fixed figure, as it depends on your existing glazing and the rest of the building. Replacing single glazing tends to give the biggest gain, while upgrading recent double glazing adds less.
Yes. A modern insulated door with good seals reduces heat loss and draughts, so doors and windows together improve efficiency more than either alone.
If hitting a particular band is your goal, it helps to assess first so you can see where the cheapest gains are. Sometimes insulation or heating controls add more points per pound than glazing.
Planning new windows or doors around York and North Yorkshire? Download our latest brochure to see the range, or request a free quote and we will talk it through.