A first house is a milestone disguised as a pile of boxes. The couple has the keys, an empty entryway, and a hundred things on the list, and most housewarming gifts end up in a drawer. The ones that stick are the ones that mark the place rather than just fill it.
An address sign is the obvious win, and for a reason. It is the first thing that makes a house feel like theirs from the outside, and it goes up the first weekend. A ceramic or metal version handles the weather by the front door, and it reads as decor rather than hardware.
A coordinates sign works on the same idea from the inside. The latitude and longitude of the new house, cut into wood, turns an address into something quieter and more personal. It is the kind of gift that gets a second look, because it takes a second to realize what the numbers are.
A family name sign with the year established marks the start of the chapter. For a first house especially, that established year carries weight, because it is the year everything began. Hung in the entryway, it greets them and everyone who visits.
If you want something lighter, a watercolor print of the house itself, made from a photo, captures the specific building rather than a generic home. It is the one gift tied to that exact address, which is hard to beat for a first place. Everything is made to order, so whatever you choose points at their house and no one else's.