Energy Bill Savings Calculator
How it works
The calculator uses Energy Saving Trust 2024 benchmarks for a typical gas-heated 3-bed semi at the current Ofgem price cap. It sums the per-measure savings you select, then shows the percentage reduction against your stated bill. Higher bills generally mean larger absolute savings.
Worked example
£2,400 annual bill, no insulation, no solar → adding loft + cavity + smart controls saves ~£610/year (25% off) for a payback under 4 years. Add solar and battery and you double that.
Who should use this
- •Homeowners planning a phased retrofit
- •Renters checking which low-cost measures are landlord-approved
- •Anyone shocked by their last winter bill
Common mistakes
- ×Installing solar before insulating — wastes generation
- ×Overspending on a smart thermostat without a wet heating system
- ×Cavity wall insulation in unsuitable exposed homes (causes damp)
- ×Believing 100% savings claims from cold-callers
Frequently asked questions
Should I insulate or get solar first?▾
Insulate first. Reducing demand makes any later renewable system cheaper and smaller.
Is a battery worth it?▾
Increasingly yes — pairing a 5kWh battery with solar typically adds £200–£400/year by exporting at peak times and using cheap overnight Octopus tariffs.
Will savings keep up with prices?▾
If energy prices rise, your savings rise too — that's the hidden upside of efficiency.