Shared groceries among flatmates: 4 rules that work
Communal milk, communal olive oil, your "DON'T EAT - SARAH" labelled hummus. The grocery rules of a shared flat are the single most common source of low-grade resentment in houseshares.
Communal: the boring stuff (milk, butter, oil, basic spices, toilet roll, washing-up liquid). Personal: anything brand-specific or expensive. Communal-budget gets paid into a flat kitty monthly; personal groceries don't cross the line.
Not "groceries". The category is too broad. Specifically:
Each flat picks where they draw the line. The rule that matters is naming the line, not where you put it.
Don't ask one person to "buy the toilet roll and we'll sort it later". Instead:
EvenRound works for this: create a "Flat groceries" group, log the £15/month standing-order contribution as an expense, then communal purchases get added as expenses paid by whoever bought them.
Your oat milk is yours. The £8 sourdough is yours. Other flatmates eating it is a social violation, not a money question.
How to handle it: ask, don't accuse. "Did you have some of my oat milk? Happy to share but I want to know whether to buy more."
Flatmate rotation, dietary changes, new jobs - all of these shift what counts as communal. A 10-minute "is the kitty still working?" conversation every six months prevents the slow drift from becoming a row.
We used to buy "shared" groceries on whoever's card and track via a tracker. The kitty is better - it skips the bookkeeping question entirely. The standing order makes it boring; boring is good.
Set up a flat groceries group with the four rules in the description.
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