Making healthy homes? A pilot study of the return on investment from an external wall insulation intervention

Abstract

Objectives: External Wall Insulation (EWI) insulates and protect homes against damp. The Energy Company Obligation (ECO) scheme incentivised large energy providers in the UK delivering energy efficiency measures such as EWI to fuel impoverished households. Return on Investment (ROI) analysis is utilised to determine if EWI is a cost-effective procedure in terms of improving health related quality of life (HRQOL) measured using the EQ-5D-3L™, reducing health care expenditure, and fuel costs. Data comes from Stockton-On-Tees council, health care costs data, and information collected from households in the most socially deprived areas in Stockton-on-Tees. Results: The total cost of installation across all 2252 that received EWI was £10,222,954 in 2016 GBP. Annual total benefits were extrapolated across all 3265 households that received EWI. Total benefits were differences between the control and treatment groups in fuel costs, health care costs, and HRQOL multiplied by the National Institute for Health and Care Excellence Quality Adjusted Life Year threshold (£20,000). Total benefits for all households that received EWI were £1,519,045. The ROI of EWI is-41%. 7.9 years are needed to recoup the costs of the initial investment.