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Should you get a water meter? The bedroom rule answers it.

Last verified 12 Jun 2026 · Source CCW + Citizens Advice (verified this session) · Publisher: CA Capital Limited (company no. 10848369)

Unmetered water bills are based on your home’s decades-old rateable value — not what you use. Which means one honest rule decides most cases: more bedrooms than people = a meter very likely cuts your bill (single people and couples in family homes save the most). Installation is free in England & Wales, the free CCW calculator gives you a personal answer in ten minutes — and if the meter disappoints, you can switch back within 24 months. A rare genuinely low-risk money decision.

£0Meter installation — free on request
Beds > people?The rule of thumb that decides it
24 monthsTo switch back if it disappoints
10 minFree CCW calculator — personal answer
Run the check → Struggling with the bill instead?

Step one: the ten-minute check

  • The rule of thumb: count bedrooms, count people. More bedrooms than people → a meter probably wins. The reverse — a full house in a small property — often does better staying unmetered.
  • Then confirm it properly: the free CCW water meter calculator (the independent water watchdog) takes your real bill and honest usage and gives a personal verdict. No sign-up, no sales.
  • Typical winners: single people and couples in 3-bed houses, retired people whose children have left, anyone whose rateable-value bill looks absurd against their actual use.
When NOT to switch Big household, small home, heavy use — garden watering, daily baths, teenagers — and the meter can cost you more. That’s exactly what the calculator catches. Run it before requesting anything, and remember metering is one-way for the property after your switch-back window closes.

Step two: switch free — with the escape hatch

  1. Request the meter from your water company — installation is free in England & Wales, usually within a few weeks.
  2. Can’t be fitted? (shared pipework, some flats) — they must usually offer an assessed charge instead: a bill based on bedrooms/occupancy that’s often cheaper than the rateable-value bill. Ask for it by name if the calculator said you’d save.
  3. The 24-month trial: bill worse than promised? Switch back to unmetered charging any time within 24 months of installation (exception: compulsory-metering areas of England). Diary a 20-month bill review.
  4. Renting? If you pay the bill you can usually request the meter yourself — tenancies under 6 months need the landlord’s consent; longer ones generally don’t. Tell the landlord either way.
Already metered and struggling? Three protections most people never use: WaterSure caps the bill at the company average (low-income + 3 children or a medical water need), every company runs a social tariff (15–85% off), and household water can never be disconnected for debt in England & Wales — the full water-bill help guide.
Do this now

Count bedrooms, count people. More bedrooms? Run the CCW calculator tonight with your latest bill — ten minutes for a personal answer worth a three-figure sum to many households.

Calculator says yes → request the free meter (or the assessed charge if one can’t be fitted), and diary a bill check at 20 months while the switch-back door is still open.

Related guides Water bill help (WaterSure + social tariffs) Energy bill help Cheaper broadband Stop overpaying Household money-leaks audit

Water meters — common questions

Will a meter save me money?

More bedrooms than people = very likely yes (unmetered bills track old rateable values, not use). Confirm with the free CCW calculator — ten minutes, personal answer. Full houses with heavy use often do better unmetered.

What does it cost?

Nothing — installation is free in England & Wales when you request it.

What if it backfires?

Switch back to unmetered charging within 24 months of installation (except compulsory-metering areas). Diary a bill review at 20 months.

They say a meter can't be fitted?

Ask for the assessed charge by name — a bedrooms/occupancy-based bill that is often cheaper than the rateable-value one.

Metered and struggling to pay?

WaterSure caps the bill (low income + 3 children or medical need), social tariffs cut 15–85%, and household water can never be disconnected for debt in England & Wales.

Sources The bedrooms rule, free installation, the 24-month switch-back and assessed charges · CCW — should I get a water meter + CCW calculator (verified this session). Renter rights · Citizens Advice. No-disconnection protection · Water Industry Act 1999. SortedUK is not a water company and this is general information. Last reviewed: 12 June 2026.

Count the bedrooms. Count the people. Then count the savings.

Ten free minutes on the watchdog’s calculator — with a two-year safety net if you switch.

Run the CCW calculator → Find what I’m missing
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