Council Tax on New Build Properties 2026/27
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Try free →When council tax liability actually starts
Council tax on a new build doesn’t start the moment building work finishes — it starts from the date specified on a completion notice, issued by the council (via the Valuation Office Agency) once a property is deemed substantially complete, or expected to be within a set number of weeks. This date can come before you’ve actually moved in, which catches some new-build owners and developers off guard.
What developers and buyers need to know
- If a completion notice is served while a property is still unoccupied, the developer or owner is liable for council tax from that date, not from the sale completion date
- You can appeal a completion notice if you believe the property genuinely isn’t substantially complete, but the appeal needs to be lodged promptly and with supporting evidence
- Once occupied, the property is banded by the Valuation Office Agency based on its 1991 (England) or 2003 (Wales) equivalent value — a process that can take a while to catch up with newly built homes, sometimes leaving a temporary interim band
- From 1 April 2026, Welsh councils gained the power to charge a premium on new-build properties that remain unsold or unoccupied for an extended period after completion
Practical advice for new-build owners
If you’ve just bought a new build, check whether a completion notice has already been served and from what date, rather than assuming your liability starts on your moving-in day — this is one of the most commonly disputed council tax issues for new properties.