Which of these you have met depends on your family and where you grew up, not on any rulebook, and the honest position is that the documentation thins out fast once you look for it.
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See this printSee all sizes and pricesBread and salt, the one with a paper trail
This is the widest-travelled of them. The custom is a welcome rite rather than a housewarming rite in origin: the fullest account we could find describes bread and salt as "offered to guests in a ceremony of welcome in cultures around the world", particularly in Slavic countries and also in "Baltic, non-Slavic Balkan, and Middle Eastern cultures", with the bread standing for hospitality and daily sustenance and the salt for long friendship. The bread and salt page goes into it properly, including what our source is and why we are being careful about it.
The plant, the broom and the toast
A plant for growth, a new broom so you don't sweep the old house's luck into the new one, a candle for light, a coin for money. We can tell you these are commonly given and commonly explained that way. We can't point you at a museum, a folklore society or a national archive that documents any of them as a British housewarming custom, because we looked on 3 September 2026 and didn't find one. Treat them as pleasant habit rather than heritage.
What Britain does document
There is a well-recorded British threshold custom, and it is not a housewarming one. The National Coal Mining Museum describes first-footing as "the old Scottish or Northern English tradition of welcoming in the New Year", an "old custom – promising good luck and good health – to households", with the first person over the threshold traditionally carrying a coin, salt, coal and a drink. It is about a date rather than a move, but the shape is identical: somebody crosses your threshold carrying something small, and the household is better for it.
This is part of the housewarming. Read bread and salt next, then what to write in the card, which is where the wish gets written down. If you would rather give something that stays on a wall, a personalised new home gift of the house itself outlasts the ritual.
Bread and salt quoted from Wikipedia, which is not a primary source and is named here because no museum or encyclopaedia entry we could reach documents the custom. First-footing quoted from the National Coal Mining Museum. Both read 3 September 2026.