Home Energy Audit Calculator
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How to Audit Your Home's Energy Performance
A home energy audit identifies where your home loses heat and which improvements offer the best return on investment. This calculator provides an instant estimate based on your home size, energy bills, and current insulation and glazing status.
EPC Rating Explained
| Rating | Description | Typical Annual Cost | Common In |
|---|---|---|---|
| A (92-100) | Highly efficient, near zero-carbon | Under EUR 500 | New builds, Passivhaus |
| B (81-91) | Very efficient, well insulated | EUR 500-800 | Modern homes, deep retrofits |
| C (69-80) | Above average efficiency | EUR 800-1,200 | Post-2000 builds, retrofitted homes |
| D (55-68) | Average UK/EU home | EUR 1,200-1,800 | 1970s-1990s homes |
| E (39-54) | Below average, improvement needed | EUR 1,800-2,500 | Pre-1970s homes |
| F (21-38) | Poor efficiency | EUR 2,500-3,500 | Victorian/Edwardian homes |
| G (1-20) | Very poor, urgent improvement | Over EUR 3,500 | Uninsulated old buildings |
Most European countries now require a minimum EPC rating of E for rental properties, with plans to increase this to C by 2030. Improving your rating now protects your property's rental and sale value.
Improvement Priority Matrix
| Improvement | Typical Cost (EUR) | Annual Saving (EUR) | Payback (years) | Difficulty |
|---|---|---|---|---|
| LED lighting | 50-150 | 50-100 | 1-2 | Easy DIY |
| Draught-proofing | 100-300 | 50-100 | 1-3 | Easy DIY |
| Loft insulation (270mm) | 500-1,500 | 200-400 | 2-5 | Moderate DIY |
| Cavity wall insulation | 500-1,500 | 150-300 | 3-6 | Professional only |
| Smart thermostat | 150-300 | 100-200 | 1-3 | Easy DIY |
| Double glazing (8 windows) | 3,000-7,000 | 200-400 | 10-20 | Professional only |
| Solar panels (4kW) | 5,000-8,000 | 400-800 | 8-14 | Professional only |
| Air source heat pump | 7,000-14,000 | 300-600 | 12-25 | Professional only |
| External wall insulation | 8,000-15,000 | 300-500 | 20-35 | Professional only |
Start with the improvements at the top of the table. Each one has a short payback period and makes your home more efficient before you invest in larger projects. Explore specific costs with our energy savings calculator.
These calculations are estimates only. Actual requirements may vary depending on surface conditions, product specifications, and installation methods. Always consult a qualified professional for precise measurements.
Prices updated: 2026-03Frequently Asked Questions
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