A hospital in Rhondda Cynon Taf will be temporarily reducing the number of beds on its dementia assessment ward while refurbishment work is carried out.
The number of beds in the Seren ward at the Royal Glamorgan Hospital will go down from 30 to 20 from the start of January.
The hospital says the work, which will involve removing existing walls and building new ones, is necessary to ensure patients "continue to be treated in a high-quality environment".
The health board says that patients who need a hospital assessment during the refurbishment work will be admitted to Seren ward if beds are available or to a bed elsewhere in Cwm Taf Health Board area until one becomes free on Seren ward.
The work is expected to last up to 12 weeks.