Meter vs Unmetered Comparison
--
Water Meter vs Unmetered Calculator
Enter your current unmetered annual bill and your household's estimated water usage to see whether switching to a meter would save you money. Average 2026 UK rates are pre-filled — enter your supplier's exact rates for a more accurate comparison.
Tip! — Your current annual water bill is on your water bill or online account. Your rateable value (for unmetered) is also shown on your bill. Not sure of your usage? Use the Average Water Usage Calculator first.
| Current Unmetered Bill | |
| Current Annual Water Bill (£) | |
| Estimated Metered Bill | |
| Household Size (people) | |
| Estimated Annual Usage (m³) | |
| Water Supply Rate (£/m³) | |
| Sewerage Rate (£/m³) | |
| Annual Standing Charge (£) | |
Full Comparison
| Item | Metered | Unmetered |
|---|---|---|
| Run calculation to see comparison | ||
GUIDE
Water Meter vs Unmetered — Which Is Cheaper?
Understand how metered and unmetered billing works, who benefits most from a meter, and how to decide which is right for your household.
Read Guide →How to Use the Water Meter Calculator
Step-by-Step
- Enter your current annual water bill — find this on your water bill or online account. The UK average of £603 is pre-filled.
- Enter your household size — used to sense-check the usage estimate.
- Enter your estimated annual usage in m³ — if you are not sure, use the Average Water Usage Calculator to get an estimate based on your household size and habits. A typical 4-person household uses around 164 m³/year.
- Check the rates — UK average 2026 rates are pre-filled. For a more accurate result, find your supplier's exact rates on their website or your bill.
- Click Compare Bills — see your estimated metered cost vs your current unmetered bill, the annual saving or extra cost, and a clear recommendation.
Key Things to Know Before Switching
Meter Installation Is Free
All UK water companies are required to install a meter free of charge on request. There is no upfront cost to switching to metered billing.
You Can Switch Back
If you request a meter installation and your bills turn out to be higher, you can switch back to unmetered billing within 12 months. This makes trying a meter essentially risk-free — but only if you requested the installation yourself. If a meter was already fitted when you moved in, this right to revert typically does not apply.
Rates Vary Significantly by Region
Water charges in the UK vary more than most people realise. Your water company is determined by your address and you cannot switch supplier. Thames Water customers in London pay among the highest rates; Northumbrian Water customers in the North East pay among the lowest. Always check your specific supplier's rates for an accurate comparison.
Frequently Asked Questions
Should I switch to a water meter?
You are likely to save money if your household has fewer people than bedrooms. Single people in 2+ bed properties and couples in 3+ bed properties typically save £150–£400 per year with metered billing. Large households with high usage may pay more on a meter.
Is water meter installation free?
Yes — all UK water companies must install meters free of charge on request. There is no upfront cost and you can switch back within 12 months if your bills are higher.
How is my unmetered bill calculated?
Unmetered bills are based on your property's rateable value — a 1990 valuation that has never been updated. Your water company multiplies this by a pence-in-the-pound rate to get your annual bill, regardless of actual usage.
How is a metered bill calculated?
A metered bill combines a fixed annual standing charge plus a charge per m³ of water used. Sewerage is charged on approximately 95% of metered supply (assuming 5% is used outdoors and does not return to the sewer).
What is the average cost per m³ of water?
UK rates vary significantly by region. As a typical average in 2026, water supply costs around £1.85/m³ and sewerage around £1.45/m³, plus an annual standing charge of around £100–£150. Check your supplier's published tariff for your exact rates.