Wales Council Tax Rules For HMOs From June 2026

Wales is changing how houses in multiple occupation are treated for council tax, with new regulations due to take effect on 3 June 2026. HMOs will be treated as a single property for council tax where appropriate, with liability falling on the owner rather than individual occupiers where rooms are separately let. That is the Welsh Government's aim, and it brings Wales into line with England, where HMOs have been treated as single dwellings for council tax since December 2023.

In a written statement, Cabinet Secretary Mark Drakeford said the change follows a 2024 consultation and is meant to end the uncertainty caused by more recent disaggregated treatment. Some HMOs had been split into separately banded units, with occupiers billed individually. In the Welsh Government's words, that had "created inconsistency and administrative complexity".

That is a fair description. In practice, this has been one of the messier corners of the system in Wales. As our council tax guidance has long had to explain, liability in HMO-style arrangements can turn on local practice and the property's internal layout, especially where kitchens and shared facilities are involved.

The new regulations are meant to simplify that. The Welsh Government says they will ensure HMOs are valued as a single property where appropriate, "providing clarity for councils, landlords and households, and ensuring liability remains with the owner". They will apply to both licensed and unlicensed HMOs. The regulations do not apply to section 257 HMOs (certain converted blocks of flats).

Propertymark has welcomed the change. It said its members had seen real variation between local authorities under the current approach. In some areas, contract holders were being landed with high council tax bills. In others, some were not paying at all.

The change is not retrospective. Existing disaggregated assessments will not automatically disappear on 3 June. The Welsh Government says owners of HMOs that were previously assessed on a disaggregated basis may make a proposal to the Valuation Office Agency to amend the valuation list.

The VOA will not change the valuation list on its own, so affected owners will need to submit a proposal if they want the assessment revisited.

Wales is removing a needlessly awkward area of council tax administration and bringing itself. The new rule brings clarity as of June 2026, but landlords with already disaggregated HMOs should not assume anything will change automatically.