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Check your loft insulation
270mm is the magic number. Most lofts are short of it.
Money & energy
best in autumn
Free to check
Your hour
Get up there with a tape measure. Under 270mm? Price a top-up, or check whether you qualify for help under the Great British Insulation Scheme.
Make it an assist 💚
Do your parents' loft while you're at it — theirs is probably worse.