Expand the Warm Homes Plan

Policy baseline

The manifesto pledged extra home-upgrade spending, and government plans add public funding for insulation and low-carbon heating.

• Targets fuel-poor and inefficient homes.
• Unit costs vary sharply by property type.
• Bill savings arrive only after installation.

Core trade-offs

The direct beneficiaries are households receiving upgrades and retrofit firms. The costs fall mainly on taxpayers and scarce construction workers. The main economic question is delivery bottlenecks can dilute bill savings.

• Households receiving upgrades and retrofit firms gain most directly.
• Costs fall mainly on taxpayers and scarce construction workers.
• Key risk: delivery bottlenecks can dilute bill savings.

Fiscal impact by 2028-29

+GBP 1.5bn to +GBP 6.0bn. Central estimate: +GBP 3.0bn.

• Positive numbers mean net fiscal cost; negative numbers mean Exchequer savings.
• Main channel is the scored tax, spending or delivery change.
• Offsets depend on tax receipts, behaviour and pass-through.
• Range reflects uncertain implementation and economic response.
• This is not an official costing.

Economic impact by 2028-29

• Jobs: Green construction and supply-chain jobs rise; fossil-linked jobs face transition risk.
• Wages: Skilled retrofit and energy workers may gain; households gain only if bills fall.
• Prices: Upfront costs are high; long-run energy bills may fall if delivery succeeds.
• GDP / productivity: Potentially positive through lower energy imports and innovation; delivery bottlenecks can weaken returns.

Assessment

This is a real trade-off, not a free gain. Households receiving upgrades and retrofit firms benefit, while taxpayers and scarce construction workers bear most costs. Overall output depends on behaviour, capacity and pass-through.

Confidence: Medium-low. Higher on the policy target and fiscal channel; lower on behaviour, pass-through and economy-wide effects.

Main risks

• Supply-chain limits: Skills, grid connections and materials can delay delivery.
• Cost overruns: Retrofit and energy projects often face uncertain unit costs.
• Weak additionality: Public money can replace private investment rather than add to it.

Safeguards

• Publish project pipelines and unit costs.
• Use competitive procurement where possible.
• Report additional private investment mobilised.

Academic evidence

UK government evidence

Sources

• PolicyLens illustrative scenario methodology for expand the warm homes plan Internal - PolicyLens, 2026
• Carbon Taxes and CO2 Emissions Academic article - Andersson, American Economic Journal: Economic Policy, 2019
• Budget 2025 UK government budget - HM Treasury, 2025
• The Macroeconomic Impact of Europe’s Carbon Taxes Academic working paper - Metcalf and Stock, NBER, 2020
• Warm Homes Plan UK government plan - Department for Energy Security and Net Zero, 2026
• Change: Labour Party Manifesto 2024 Party policy source - Labour Party, 2024

Other Labour policies

• Raise employer National Insurance
• Apply VAT to private school fees
• Replace non-dom tax status
• Raise capital gains tax rates
• Extend the Energy Profits Levy
• Capitalise the National Wealth Fund
• Capitalise Great British Energy
• Move renewables charges to tax