
A plant that is hard to kill
A snake plant, a ZZ, or a pothos, something that survives a period when nobody is watering anything. Give it in a pot that does not need replacing.

Some links on this page go to Amazon. If you buy through one we earn a small commission, at no extra cost to you. It never changes what we recommend or the order we put things in. Photographs here are illustrations of the kind of thing described, not pictures of a particular product.
Things that suit a house rather than a person, which is the safer target when you do not know their taste.

A snake plant, a ZZ, or a pothos, something that survives a period when nobody is watering anything. Give it in a pot that does not need replacing.

Most households have a mismatched assortment and never buy a matching set. Plain, sturdy, and replaceable is better than delicate.

An odd gift that becomes an obvious one the moment you have given it. Particularly apt for a first home.

End-grain wood, large enough to be awkward. It is the kitchen object most people wait years to buy for themselves.

Overhead lighting makes a new place feel like a rental. One warm lamp in the corner changes a room more than anything else at the price.

Thick coir, sized to the door. Unromantic, immediately used, and nobody buys their own until the second year.
Discovered at nine on the first night, when nothing is open.

Different from a smoke alarm and just as necessary in any home with gas. It takes a minute to fit and is the kind of thing nobody buys for themselves.

Every new home has a month of shelves, curtain poles and pictures. Borrowing a drill for all of it gets old quickly.

Light bulbs, curtain rails, the top shelf. It lives behind a door and gets used far more than expected.

Sockets are never where the furniture goes. Two of these solve the first week of rearranging.

Both are wanted exactly once and urgently. Put them somewhere obvious and mention where.
The second month, when the flat becomes a home.

Comes out for every visitor from then on.

No garden, immediate laundry, and nobody buys one until they need it.

Small fixes that make a place work.
Unglamorous, immediately used, and the reason people remember who turned up.
Bin bags, kitchen roll, washing-up liquid, light bulbs, a decent pair of scissors, tea and coffee. Assembled in one box it becomes a gift rather than a shopping list.
Delivered, or brought round in a pot with the plates included. On moving day the kitchen is the last room to work and everyone has forgotten to eat.
A screwdriver set, a hammer, a spirit level, and a stud finder covers most of the first month. A first-time buyer generally has none of these.
Two small errands that sit on the list for months. Doing them for someone is a specific kind of thoughtful.
Once the rooms have decided what they are.
Ask which wall is still bare. It converts a guess into a commission and it removes the risk of a picture that never comes out of the box.
The one situation where a voucher is the right answer, because the list of things they need is long, specific, and only known to them.
Put in the date and see how long you have, and the last sensible day to order each kind of gift.
It comes around every year and almost nobody marks it. We'll remind you about a month ahead.
A housewarming gift has an unusual constraint: it arrives at the exact moment the recipient has nowhere to put anything. Almost everything decorative given on moving week ends up in a box for six months, which is a reasonable argument for splitting this into two kinds of gift.
The first kind is for the first week, when the kettle is missing and nobody has found the bin bags. These are boring and they are the ones people remember, because they arrive precisely when the household is not functioning.
The second kind is for the walls, and it is better given a month or two later once they know what the rooms are for. If you want to give something lasting, ask about the wall it is going on before you buy, or give it late, deliberately.
Modest is correct, this is not an occasion with an expectation attached. A twenty-pound box of practical things given on moving day routinely outperforms something three times the price given later.
Both work, for different gifts. Practical things belong on the day. Anything for a wall or a shelf is better a month later, once they know what the rooms are for.
Anything large, anything that needs a specific spot, and anything strongly scented. Candles and diffusers are given in enormous quantities at housewarmings and are the most commonly re-gifted item.
Not at all, and for a first home it is usually the most helpful thing you can do. People moving house have a very concrete list and are rarely shy about it.