Thames Water Meter Calculator

Thames Water customers typically save £120-200/year with a water meter. Single-person households save the most (up to £250/year), while couples save around £150/year. Use our Thames Water meter calculator for personalized estimates based on the 2026 rates.

Thames Water's 2026/27 metered rates are £1.90 per cubic metre for water supply and £1.50 per cubic metre for sewerage, plus a £48 annual standing charge. These rates include the 6.1% bill increase from April 2026, making Thames Water one of the more expensive water companies in England.

Thames Water serves 15 million customers across London and the Thames Valley, including London, Oxford, Reading, Slough, Windsor, Guildford, parts of Surrey, Hertfordshire, Buckinghamshire, Berkshire, and Gloucestershire. It's the UK's largest water company by customer base.

Yes, Thames Water offers a 2-year trial period for water meters. If you're not saving money with a meter, you can switch back to unmetered billing within this period at no charge, provided your property still has an unmetered rateable value.

Yes, Thames Water installs water meters completely free of charge for household customers. Installation typically takes 2-3 hours and doesn't require you to be home. They also offer free water-saving devices to help reduce your Thames Water bills further.

The 6.1% Thames Water bill increase from April 2026 affects both metered and unmetered customers. However, metered customers with low usage still typically save more money, as the increase applies to the base rates. Our Thames Water meter calculator includes these updated 2026 rates.

Thames Water meters are read automatically in most areas using smart meter technology. For traditional meters, readings are taken every 6 months, and you can submit your own Thames Water meter readings online or via their app to ensure accurate bills.