How to split utilities in a multi-floor or multi-unit house
Updated
Short answer
Start with how the bills are metered. Bills shared by the whole house split across everyone (equally or by room size). Bills metered per floor or unit go only to the people on that floor. When one bill covers floors of different sizes, split it by floor first, then equally within each floor. Write the rule down once so nobody re-argues it every month.
Splitting utilities is easy in a two-bedroom apartment: divide by two. In a bigger house with floors or separate units, a single "divide by everyone" rule starts to feel unfair, especially when some bills are metered per floor and others aren't. Here's a way to set it up once so it stops coming up every month.
Step 1: sort the bills by how they're metered
| Bill type | Typical examples | Who it's split between |
|---|---|---|
| Whole-house, one meter or account | Internet, water, trash, a single gas or electric meter | Everyone in the house |
| Per floor or per unit | Separate electric meters, a unit's own heating | Only the people on that floor or unit |
| Personal | A streaming account one person uses | Not shared |
Step 2: pick a rule for each kind
Equal by person
Divide the bill by the number of people sharing it. Simple, and fair when rooms and usage are similar.
By floor, then by person
When one bill covers floors of different sizes, give each floor a share first, then split equally within the floor. Use this when the bill follows the space (heating a bigger floor costs more) rather than the people.
By shares
Give bigger rooms or heavier users more shares, for example 1.5 for the room with its own bathroom and 1 for everyone else. Agree the shares once.
Worked example
A two-floor house: three people upstairs, two downstairs. Internet is $75 for the whole house. Electric is metered per floor: upstairs $120, downstairs $90.
- Internet (whole house, equal): $75 ÷ 5 = $15 each.
- Upstairs electric (floor only): $120 ÷ 3 = $40 each for the three upstairs.
- Downstairs electric (floor only): $90 ÷ 2 = $45 each for the two downstairs.
Upstairs pays $55 a person, downstairs $60. Each floor pays for what it uses, and nobody subsidizes the other floor's space heaters.
Step 3: decide who pays the company
One person per bill holds the account, pays it, and logs it. Everyone else pays that person back by a set day each month. Spreading the accounts across people spreads the hassle and the credit risk.
Step 4: write it down
Put the rules in your roommate agreement: which bills are shared by whom, the split rule, who holds each account, and the pay-back day.
Doing it in hausync
In hausync, the person who paid logs each bill and picks who it's split between, equally, by exact amounts, or by shares. A floor's bill goes to just that floor's people. Each person sees only the expenses they're in and a balance with each housemate, and Pay opens the payer's saved Venmo, PayPal, Cash App, or Zelle. Floors are built in, so the same house can have floor-only channels, chores, quiet hours, and laundry machines.
Questions people ask
Should utilities be split equally or by room size?
Equal is simplest and fine when rooms are similar. If one room is much bigger or someone runs a space heater all winter, agree a share-based split up front (for example 1.5 shares for the big room) rather than arguing bill by bill.
How do we split a bill between floors with different numbers of people?
Decide whether the bill follows people or space. Following people: divide by headcount across the house. Following space: split by floor first, then equally within each floor.
Who should pay the utility company?
One person per bill pays the company and logs the expense; everyone else pays that person back. Rotating which person holds which account spreads the hassle.