Get an assessed water charge when a shared supply blocks metering
How a shared household can apply for a water meter, document why fitting fails, compare an assessed charge, and choose an internal split.
If a water company cannot install a meter because a shared supply or communal system makes fitting one impractical, apply for the meter anyway and ask for an assessed charge after the survey. Then compare that quoted charge with the current unmetered bill before choosing. Do not invent a roommate submeter formula and call it the water company's assessed charge.
Apply for a meter to trigger the assessment
In England and Wales, an assessed charge is an alternative to a standard unmetered charge when the company cannot install a requested meter. Ofwat states in its assessed charges guidance that the company must offer an assessed charge if a meter cannot be installed, but it will not offer one unless the customer first applies for a meter.
Have the person responsible for the water account submit the application and save the confirmation. Tell the company that the property is a shared home, but describe the plumbing facts rather than assuming the outcome. A shared external supply, several feeds into the property, communal hot water, or inaccessible internal pipework may affect installation. The company's survey determines whether fitting a meter is practical or too expensive.
Ask the surveyor or company to explain the decision in writing. Record which property the decision covers, especially in a converted house or building with similar flat numbers. A refusal based on the wrong unit is not a useful basis for comparing charges.
Understand how the assessed charge is set
An assessed charge is not a reading-based bill. Ofwat says companies generally base it on the number of bedrooms, property type, number of occupants, or the average metered bill in the company's area. The exact basis and amount are found in that water company's charges scheme, and methods vary between companies.
Request the current charges scheme and the calculation that applies to the home. Check the recorded bedroom count, property type, occupancy category, and service components. Ask whether wastewater and fixed charges are included in the figure. Do not assume that one resident's temporary absence changes the formal category.
Ofwat's broader meter installation guidance identifies shared supplies and communal facilities among reasons a meter may not be possible. It also says the customer should compare the assessed charge with the current bill to decide whether it saves money.
Compare full-year costs on the same basis. Include water, wastewater, and fixed elements on both sides. If one quote covers a partial period, convert it only after confirming the dates and whether rates change during that period. Keep the company's figures separate from the household's internal split.
Agree how roommates will share the charge
The water company's assessed method sets the household bill, not each resident's personal use. Decide independently how the household will divide it. An equal split may be simple for stable occupancy. An occupancy-day method may fit a home with documented move-ins and move-outs. Whatever rule you choose, write it before the first assessed bill arrives.
Do not use informal bedroom submeters to claim that the utility's assessed charge was usage based. If the home already has private submeters, the shared-rental submeter guide can help residents distinguish landlord allocation from the water company's master account.
When occupancy or property details change, check the company's charges scheme or contact it. Do not silently recalculate the official bill. If the company used incorrect facts, submit the evidence and ask for a corrected assessment.
How HomeCo helps
Track the meter application, survey appointment, written refusal, assessed-charge quote, current unmetered bill, and decision deadline with HomeCo tasks. Assign the account holder to obtain the charges scheme and another resident to verify property facts. Post an announcement summarising the annual comparison and keep the source documents in the household's agreed storage.
Once the household chooses, add the assessed bill as a fixed utility expense and apply the agreed roommate rule. Keep a reminder to review the comparison when the company publishes a new charges scheme or when household occupancy changes materially.
Frequently asked questions
Can we request an assessed charge without applying for a meter?
Ofwat says no. The assessed option follows a meter application that the company cannot fulfil because installation is impractical or too expensive.
Does a shared supply automatically guarantee refusal?
No. A shared supply can make installation impossible, but the company must assess the property. Let the survey establish the plumbing and cost constraints.
Is an assessed charge always cheaper?
Not necessarily. Compare it with the complete current unmetered bill using the same service period and included services before accepting.
Can roommates change the company's bedroom count themselves?
No. If the underlying property information is wrong, give the company evidence and request a correction. Your internal split does not alter the official charging basis.