The Galway Clinic has applied to city planners to give it permission for extension.
Clinic bosses are seeking the go-ahead for a single-storey extension to the existing site on the 4.9 hectare site.
The extension will comprise expansion of the day-care unit at ground floor level, totalling 84sqm2.
The hospital also wants to expand the existing boiler flue by three metres with the top of the flue now rising to a level of +52.6.