
WINDOWS:
The Key to a Good Renovation
Your windows are where you’re losing anywhere between a third and a half of the heat out of the house – Martin Ball, NK Windows
To manage the internal conditions inside the home, energy efficiency, moisture control, consistent healthy temperatures – your windows are critically important
If you have single glazing in existing timber frames that are in good condition, it can be worthwhile to retrofit new double or triple glazed PVC or thermally broken aluminium windows into the timber frame – recess the new windows to align with the insulation within the wall, to avoid condensation problems



“To get the benefit of triple glazing and fully sealed windows, we left the frames intact... Cut everything out, and we used a frame with a flange – it works really well, you just push it in, rubber seals, easy, non intrusive, doesn’t damage any walls, and you have triple glazing straight away.”
Andrew Krupa: Koffman Windows

“With the windows in the older houses, normally the double hung windows that have got weights in the walls... they are good because they’re wooden, they’re good for lack of thermal bridging – but they’re very draughty and they’re single glazed.”
Dan Saunders: Dan Saunders Construction

“Sometimes there are restrictions for low-E glass of the thickness of the unit... there's no regulatory requirement, so often, old-school clear-on-clear glass gets used and people think double glazing is great. We know that’s not the case! We can get better performance with low-E glass depending on the thickness of the unit.”
Darren Ballantine: Metro Glass

“Conversations are needed about the pros and cons of retrofitting the glass versus replacing the whole window frame and glass.”
Martin Ball: NK Windows (2024)

“You can just start at the very beginning and have your thermally broken windows recessed back into the frame, little things like that . You’re still going to have to get windows so you might as well put them back in within the line of the thermal break of the walls. If you start there you – doing a renovation maybe opt for the 2.8 R-value insulation rather than the 2.6 – little things.”
Clayton Mitchell: Statement Homes
