A three storey house in Dovercourt is set to be converted into two flats.
Tendring District Council (TDC) has approved the scheme for the property in Fronks Road which will include an external staircase.
Harwich Town Council objected to the plans as it felt the change would look out of character with the surroundings.
The Harwich Society also raised concerns about the parking arrangements.
However, TDC gave the go ahead and decided the proposal would not have any significant impact on neighbours or highway safety.