Answer:

addonto

AnswerCrossword Clue
ADDONTOEnlarge, in a way
ADDONTOExpand
ADDONTOEnlarge, as a home
ADDONTOExtend
ADDONTOEnlarge, as a house
ADDONTOExtend, as a house
ADDONTOExpand, as a house
ADDONTOExpand, as a home
ADDONTOSupplement
ADDONTOAppend
ADDONTOPad
ADDONTOExtend, in a way