Plans have been submitted to convert Neva House in Piltdown, near Uckfield, from offices to residential.
The building is occupied by Neva Consultants and the business is seeking the change of use to give an option as it considers the possibility of moving to bigger premises in the future.
For the time being though, the contract hire and fleet management company is continuing to recruit staff and grow the business at Piltdown, according to managing director Graham Prince.
The planning application covers providing three, one-bedroom flats on the ground floor, and a three-bedroom flat on the first floor of Neva House, in Goldbridge Road.
No changes are proposed to the outside of the two-storey detached modern building, or to the access, or to parking on the site.
A statement with the application says it is unlikely the proposed change of use would have any significant increase in journeys made to and from the site, and was more likely to decrease them.
Because of this it was unlikely there would be any significant impact on the transport network.
Currently 25 full-time employees work at the office Mondays to Fridays and there are also at least two visits to the office a week. This results in 254 vehicle movements per week.
The statement says the change of use would result in four flats, occupied by a maximum of nine people.
There are nine parking spaces on the site.