Moving into a flat share in the UK means signing up to a stack of shared costs beyond your rent. The big ones are council tax, gas and electricity, broadband, contents insurance, and the TV licence — and if you don't sort them out properly from day one, you'll spend the next twelve months chasing your flatmates for cash. The good news? None of it is complicated once you know what's coming. Here's exactly what to expect, what each bill costs in 2025, and how to split bills fairly with your flatmates so nobody ends up subsidising someone else's hot showers.
Council Tax
Council tax is almost always the biggest non-rent cost in a flat share. It's set by your local council and charged per property, not per person — so the household pays one bill and splits it amongst yourselves.
In England, a Band C property (very common for flats) runs roughly £1,600–£2,200 per year depending on your borough. Divide that by three or four flatmates and it becomes manageable, but it's not a bill you can ignore. If even one flatmate is a full-time student, it changes the maths — check out council tax student exemptions before assuming everyone pays an equal share.
Gas & Electricity
Energy is usually the most variable bill in a flat share. Usage depends heavily on the season, how often people cook, whether you leave heating on all day, and how aggressively your flatmates run the dryer.
A typical 3-bedroom flat in the UK spends £100–£160/month on gas and electricity combined in 2025 (post-energy-crisis prices). Get a joint account with a supplier, or have one person be the account holder and set up a regular contribution from the others.
Broadband
Broadband is blessedly predictable. A standard 100–500Mbps fibre deal runs £25–£40/month from providers like BT, Sky, Virgin Media, or Vodafone. Gigabit deals push up to around £55/month.
One person will need to sign the contract — make sure everyone agrees upfront who that is and how repayments happen each month.
Contents Insurance
Contents insurance is often skipped in flat shares, which is a mistake. A standard flat share policy (covering everyone's belongings) costs roughly £8–£20/month total. Some providers offer housemate-friendly policies that cover each resident separately, which avoids arguments about whose laptop counts under whose policy.
TV Licence
If anyone in the flat watches live TV, uses BBC iPlayer, or has a TV plugged in, you legally need a TV licence. It's £174.50/year (2025 rate) per property — not per person. Split between flatmates it's minor, but it's a real cost and the fine for dodging it is not worth the saving.
Getting ahead of your bills before you move in is what separates a smooth flat share from a stressful one. Set up a shared system early, agree on who manages what, and you'll barely notice the admin.