Where to start
Start with ceiling insulation. If it's safe to access, check your roof space for insulation — even if you have some, it may need topping up.
Once your ceiling insulation is sorted, insulate the underfloor of your building. If the underfloor is accessible, and more than half a metre off the ground, make this your next priority.
Stop warm air from escaping by blocking draughts and sealing gaps.
Use thermal imaging to find heat loss
Thermal imaging is a non-invasive way to find draughts around doors and windows, and find defects in insulation, cables and ducting. You can get help from an expert, or hire or buy a thermal imaging camera.
Get help with insulation design
For larger buildings and those with specialised heating requirements, such as data processing centres, ask a specialist for advice.