Collocations for addition - noun

useful, valuable, welcome, worthy
important, major, notable, significant
latest, new, recent

make
We have made several additions to the collection recently.

in addition
There is, in addition, one further point to make.

addition to
the latest addition to the family (= a new baby)

simple
He worked it out through simple addition.

do
She can do addition, but she hasn't learned subtraction yet.

building, room
two-story, three-story, etc.
490-square-foot, 2 000-square-foot, etc.

build
design
a 22 000-square-foot addition designed by a Japanese architect

addition to
a family-room addition to his home