Of course you can’t time building work solely with the moon cycle. But this symbol acts as a little reminder to get on with small DIY jobs. For example paint a room or piece of furniture, book a handyman to repair the garden path or gate and so on. The best time generally is the Waning Moon and New Moon.
In the garden try to lay paths, cement in fences, erect garden structures during the time of the Waning Moon or Earth Days.