Property guide
Insulation and glazing
Draughts, cold glass and heat that escapes
Fabric comes first. Every watt that stays inside is one you never pay for. Windows are often the weakest point, especially single or early double glazing, and in homes where the original look matters.
Signs you may notice
- Cold to touch windows
- Draughts near frames and doors
- Condensation on glass
- Outside noise is intrusive
- Curtains moving when closed
Common causes
- Low performance glazing and worn seals
- Gaps at frames, skirting and loft hatches
- Thin or missing loft and wall insulation
Free checks today
- Hold a hand near frames on a windy day
- Check loft insulation depth (aim for about 270mm)
- Count windows and note which are original or listed
Technologies that can help
PassivGlas vacuum glazing
Judged on installed whole-window Uw, frame and edge included. Can often keep original frames.
Draught proofing and loft top up
Low cost, high value first steps we will always point out, even if you buy nothing from us.
Confirmed at the survey
- Window sizes, frame condition and heritage constraints
- Insulation levels and air leakage points
- Any planning or listed building limits
Ask the AI guide about this
We'll pre-fill the guide questions with the insulation and glazing signs above. Open "Help me choose" in the calculator, adjust anything, then get your reasoned starting plan.