ADDSON

• Accessorizes with

• Annexes

• Appends

• Attaches a wing?

• Attaches to the house

• Builds a new room, say

• Builds a wing, say

• Builds an extension

• Expands one's home

• Includes

• Makes a wing, say

• Makes larger

• Makes the house bigger

• Makes wings

• Runs up, as the score