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AnswerIs underfloor insulation worth it?
Underfloor insulation is usually worth it: for £1,500–£5,000 you save about £65–£180 a year, paying back in around several years — and it makes every heating system cheaper to run.
Beyond the payback, insulation improves comfort, reduces draughts and lifts your EPC rating — which also helps with heat-pump grants.
2026 figures, based on Energy Saving Trust, Ofgem & gov.uk data · always confirm with a professional survey.