The Cheapest Way to Increase EPC Rating
Improving your property's energy rating does not have to cost a fortune. The cheapest way to increase EPC rating is typically through fabric improvements such as loft insulation and cavity wall insulation, which are also among the most impactful measures available. Many of these can be accessed free of charge through government grant schemes.
At Cucumber Eco, we specialise in helping homeowners and landlords reduce bills and increase EPC ratings through a combination of funded measures, low-cost improvements, and affordable finance options.
Cheapest Measures with Individual Cost Breakdown
The following improvements offer the best return on investment for EPC improvement. Costs shown are typical market rates where grant funding is not available. Many of these measures can be funded partially or in full through government schemes.
Loft Insulation
Typically £300 to £600 (often free through grants)
Can improve EPC by one to two bands
One of the most cost-effective measures available. An uninsulated loft allows around 25% of heat to escape through the roof. Loft insulation pays for itself rapidly through reduced heating bills.
Cavity Wall Insulation
Typically £400 to £700 (often free through grants)
Can improve EPC by one band or more
Properties built between 1930 and 1995 are often suitable. Cavity wall insulation fills the gap between wall leaves, reducing heat loss by up to 35%.
Secondary Glazing
Typically £100 to £300 per window (DIY or fitted)
Modest EPC improvement, mainly thermal comfort benefit
Secondary glazing adds an internal pane to existing single-glazed windows. It is a lower-cost alternative to full window replacement and can noticeably reduce draughts and heat loss.
Floor Insulation
Typically £400 to £1,200 depending on property size
Can contribute meaningfully to overall EPC improvement
Suspended timber floors are a significant source of heat loss in older properties. Insulating beneath the floorboards with mineral wool or rigid boards reduces heat loss and improves comfort.
Free and Funded Options
The best way to increase your EPC rating affordably is to access the government grant schemes that pay for improvements in full. Millions of UK households qualify without knowing it.
ECO4 Grants
The Energy Company Obligation Phase 4 provides free energy efficiency improvements for eligible households. Qualifying benefits, income thresholds, and low EPC ratings can unlock funding for insulation, heating, and more.
Loft Insulation Grants
Loft insulation grants are available through ECO4 and the Warm Homes Plan for eligible households. Where a property qualifies, loft insulation can be installed completely free of charge.
Cavity Wall Insulation Grants
Cavity wall insulation grants are available for suitable properties where the household meets qualifying criteria. This measure is often the single most impactful improvement for eligible properties.
Great British Insulation Scheme
The Great British Insulation Scheme targets properties in the lower EPC bands and offers funded insulation improvements with broader eligibility criteria than some other government schemes.
Warm Homes Plan
The Warm Homes Plan is the Labour Government's flagship energy efficiency scheme with a budget of over £15 billion. It targets low-income households and those with low EPC ratings, providing free or heavily subsidised improvements.
Energy Efficiency Grants UK
A range of energy efficiency grants UK homeowners and landlords can access are available through various government and local authority schemes. Cucumber Eco checks all available routes on your behalf.
What is the Cheapest Way to Heat a House?
The cheapest way to heat a house depends on your existing setup, but several approaches consistently deliver the best results for UK households looking to reduce bills.
Draught Proofing
Sealing draughts around doors, windows, letterboxes, and floorboards is one of the cheapest and most immediately effective ways to reduce heat loss. It can be done for under £100 and can cut heating bills noticeably in older properties.
Smart Thermostats
Smart thermostats allow precise scheduling and remote control of your heating system. They reduce waste by ensuring your heating only runs when needed, typically cutting heating bills by 10 to 30% depending on previous usage patterns.
Storage Heaters
For properties without gas central heating, modern high heat retention storage heaters charge on cheaper overnight electricity and release heat gradually through the day. They are significantly more efficient than older electric systems.
Infrared Heating
Infrared heating panels warm people and objects directly rather than heating the surrounding air. In well-insulated properties or for zone heating, infrared can be one of the most cost-effective electric heating options available.
How to Reduce Energy Bills on a Budget
You do not need to invest tens of thousands of pounds to make a meaningful difference to your energy bills. A combination of low-cost improvements and funded measures can dramatically reduce what you spend. Here is a practical approach:
Check Grant Eligibility First
Before spending anything, find out what you are entitled to for free. Millions of households qualify for funded insulation and heating upgrades that cost nothing upfront. Cucumber Eco checks this at no charge.
Tackle Fabric Insulation
Loft insulation and cavity wall insulation are the highest-impact and lowest-cost fabric improvements. Both are often available free through grant schemes for eligible households.
Address Heating Controls
Smart thermostats and improved heating controls can deliver significant savings with relatively modest upfront investment. They are also one of the measures assessed under the Home Energy Model.
Consider 0% Finance for Larger Improvements
For improvements not covered by grants, 0% interest finance options are available through approved providers. This means you can access higher-value improvements without upfront cost.
Think Long-Term
Measures like solar PV, battery storage, and heat pumps have higher upfront costs but can dramatically reduce or eliminate your energy bills over the longer term. Grant funding and 0% finance make these more accessible.
Related topics: Government Grants and Funding Schemes, Loft Insulation Grants, and How to Improve Your EPC Rating.
Start With a Free Energy Consultation
We assess your property and household circumstances, identify what grants you qualify for, and build a practical plan to reduce bills and increase your EPC rating. It costs nothing and takes minutes to get started.
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