Your own apartment costs $1,800 a month in rent. Your friend suggests a two-bedroom place for $2,600 and says, “We'd split it.”
That's a more expensive home. But it might leave you with $550 more in your pocket every month.
The trick is to compare your share of the new home with your entire bill for the old one—not to assume your current rent simply gets cut in half.
Two homes, two very different bills
Imagine these monthly costs:
- Living alone: $1,800 rent + $220 in household bills = $2,020.
- Living with one flatmate: $2,600 rent + $340 in combined household bills, split equally = $1,470 each.
That's $550 a month, or $6,600 over 12 months if the prices stay the same. Even though the shared home is pricier, you're not paying for all of it yourself.
There's a reason sharing can work this way: the OECD recognises that living together creates economies of scale, especially when people share a dwelling. It doesn't mean every shared bill will be exactly half your old bill.
The moving van gets the first bite
Suppose moving and setting up your new room cost $1,200 in non-refundable expenses. Your $550 monthly saving needs time to repay that outlay.
After one month, you're still $650 behind. After two, $100 behind. By the end of month three, you're $450 ahead. Over a full year, the $6,600 recurring saving becomes $5,400 after moving costs.
A refundable deposit or bond is different: it ties up cash, but it isn't automatically money you've spent. Check how and when it can be returned.
What if you get the bigger bedroom?
A 50/50 rent split isn't the only arrangement. Perhaps one person gets an ensuite, a parking space or a bigger bedroom.
In the same example, if you pay 60% of the shared rent but still half the $340 bills, your monthly cost becomes $1,730. You're saving $290, not $550.
At 75% of the rent, your share reaches $2,120 including bills—$100 more than living alone.
The number worth agreeing on before moving in is what each person pays, not just how much the whole place costs.
The part a calculator can't settle
Sharing means negotiating noise, guests, cleaning, fridge shelves and what happens when one person wants to leave. There's a financial risk, too: depending on your agreement and local law, you could be responsible for more than your agreed share if someone stops paying. MoneyHelper's UK guide explains one example of how joint tenancy liability can work; rules elsewhere differ.
For your own listings, use the Flatmate vs Living Alone Calculator to compare monthly and yearly costs. Use Flatmate Bills to work through a fair split, and the Savings Goal Calculator to see what the money left over might help you reach.
Sharing doesn't guarantee cheaper living. But a carefully chosen flatmate might buy you something valuable: breathing room in your budget.
All prices are hypothetical amounts in one consistent currency, not local rent averages or exchange-rate conversions. The example assumes two people, 12 equal months, unchanged housing costs, no extra transport costs, and $1,200 in non-refundable moving expenses. Individual circumstances, deposits and tenancy rules vary.