You’ve just picked up the keys to a one-bed on a quiet street in Croydon. Within the first week you owe money to the council, the outgoing energy supplier, and whoever provides broadband to that postcode — and none of the three explain themselves as clearly as your tenancy agreement did. This guide covers what actually happens with council tax, energy, water and broadband when you move into a London rental: who is legally liable for what, which borough charges the least, and the mistakes that cost new tenants the most in the first month.
The Bill Nobody Reads the Small Print On: Council Tax
Council tax in England is banded A to H, and the band was fixed by a valuation carried out against 1 April 1991 property prices — not what your building is worth today. A converted flat built in 2015 and a Victorian terrace next door can sit in wildly different bands depending on what a surveyor decided a comparable property was worth over three decades ago, which is why two similarly priced rentals on the same street sometimes carry noticeably different council tax bills.
For a standard tenancy — one household renting a whole flat or house on a single agreement — the tenant is liable for council tax, not the landlord, from the day the tenancy starts. Register with the local council in your first week; most councils let you do this online in a few minutes, and delaying it doesn’t reduce what you owe, it just risks a backdated bill landing all at once.
Check your own band before you assume anything — the Valuation Office Agency’s checker is free and takes the address alone, and it’s worth doing before you sign rather than after, since two flats in the same building can occasionally sit in different bands depending on past alterations. Ignore the registration step entirely and the council doesn’t simply forget: unpaid council tax escalates to a reminder notice, then a summons and court costs added on top, and eventually enforcement action, all avoidable by a five-minute registration in week one.
Council Tax in a Shared House or HMO: Who Actually Pays
This is the part most renters get wrong, and it’s worth getting right. In a property let room by room to unrelated tenants — the classic HMO arrangement — the landlord or property owner is usually the one liable for council tax, not the individual tenants. Since 1 December 2023, most HMOs of this kind (aside from a narrower legal category called Section 257 HMOs) receive one single council tax bill for the whole property rather than a separate bill per room.
The exception is a joint tenancy: if you and your housemates all signed one agreement for the whole property together, rather than separate room-only agreements, the group of tenants is jointly liable in the normal way. The practical takeaway is simple — check which type of agreement you actually signed before assuming council tax is either entirely your problem or entirely not. Landlords who are liable in an HMO arrangement typically build that cost into the rent already, so a room advertised as “bills included” in a genuine HMO may just mean the landlord was always going to pay council tax regardless.
London’s Council Tax Reality: Cheaper Than You’d Think
London has a reputation as the expensive place to live, and on rent that reputation is entirely earned. On council tax, it is almost the opposite.
- Wandsworth — £1,028.21 a year at Band D, the cheapest of any local authority in England (MHCLG, 2026/27).
- Westminster — £1,049.55 a year at Band D, the second cheapest in the country.
- Kingston upon Thames — £2,608 a year at Band D, the highest in London.
- Croydon — £2,600 a year at Band D, the second highest in London.
London’s average Band D bill sits around £1,690 a year — well under the England-wide average of £2,392 (MHCLG, 2026/27). Inner boroughs with a strong commercial tax base from offices and retail can keep residential rates low in a way outer boroughs, with more social care spending and less commercial income, simply cannot. If you’re choosing between two similarly priced flats in different boroughs, the council tax gap between them can run to well over £1,000 a year — worth checking before you sign, not after your first bill arrives.
Discounts and Exemptions Renters Miss
The 25% single-person discount is the one most renters already know. Several others are claimed far less often than they should be.
- Households where everyone is a full-time student are entirely exempt from council tax — not discounted, exempt.
- A disregard exists for anyone certified as severely mentally impaired, which can combine with the single-person discount if you live with someone in that category.
- Councils hold discretionary hardship funds for genuine short-term financial difficulty — worth asking about directly rather than assuming none exists, since provision and criteria vary by borough.
- Moving in or out partway through the month means your bill is apportioned by day, not charged for the full month regardless of your move-in date.
Separate from these fixed discounts, means-tested Council Tax Support (sometimes called Council Tax Reduction) can cut your bill further if your income is low, regardless of whether you already claim the single-person discount — the two can stack. Every London borough runs its own scheme with its own income thresholds, so it’s worth applying directly through your specific council rather than assuming a neighbouring borough’s criteria apply to you.
Setting Up Energy: You Are Not Stuck With the Old Tenant’s Supplier
Take meter readings — photographs, not just numbers scribbled down — on the day you get the keys, before you contact anyone. That single habit prevents almost every dispute about who used what energy and when.
You inherit the previous occupant’s supplier by default, usually on that supplier’s standard variable tariff, but you are never obliged to stay on it. Ofgem’s Energy Price Cap limits what any supplier can charge on a standard variable tariff — currently £1,663 a year for a typical dual-fuel household paying by direct debit, up 13.5% from July 2026 — but the cap is a ceiling on the default rate, not necessarily the cheapest deal available. Compare fixed-rate tariffs against the cap using a comparison site before committing to stay put, particularly if you’re moving in during a period when fixed deals are running meaningfully below it.
Payment method changes the cap itself, which surprises most renters who’ve never checked. The same typical household pays £1,795 a year on the cap if billed by cash, cheque or quarterly direct debit — over £100 more than the £1,663 monthly direct debit rate, for identical usage. Setting up a monthly direct debit in your first week isn’t just administrative tidiness; on the numbers alone, it’s the cheapest way to be billed for energy regardless of which supplier you end up choosing.
Water and Broadband: The Two Utilities With No Real Choice
Water works differently from energy, and it catches renters who assume every utility can be shopped around. Household customers cannot choose or switch their water supplier — supply is fixed by region, and Thames Water covers most of Greater London regardless of who you’d rather deal with. Your only real task is registering the account in your name from your move-in date, so bills and any leak or service issues are addressed to you rather than a previous tenant who has since left.
Broadband is the utility renters most reliably get wrong on timing. Installation typically takes two to four weeks from order to a working line, and that clock doesn’t start until you’ve actually placed an order with a specific provider — it isn’t automatic just because you’ve moved in. Order in the first 48 hours if you can, check what’s actually available at the address rather than assuming full-fibre coverage, and if you’re commonly working from home, treat this as a higher priority than furniture.
Get These Right in Week One
Council tax and energy are the two that cost you money if you get them wrong — a backdated council tax bill or months on an uncompetitively priced tariff both add up quietly. Photograph your meters on day one, register for council tax within the week regardless of how busy moving-in gets, and check whether your specific tenancy arrangement actually makes you liable before assuming it does. If you’re weighing a model where these bills are already folded into one figure, our comparison of co-living, where bills are already folded into the headline rent, covers what that convenience actually costs.
Water and broadband are the two that cost you convenience rather than cash — you can’t shop around on one, and the other punishes anyone who orders late. Neither belongs at the bottom of a moving list behind furniture and decorating; both belong in the same first week as the council tax registration. For the rest of what needs doing in that same window — inventory, meter readings, keys — our full move-in day checklist covers the ground this guide doesn’t.
Find Your Next London Rental — FTR London
Comparing flats across boroughs? Browse listings on FTR London alongside average rent in London by area, and factor council tax band into the real monthly cost before you commit — the cheapest headline rent isn’t always the cheapest flat once the council’s bill arrives.
Landlords: tenants increasingly ask about council tax band and liability before viewing. List your property on FTR London with that information ready, and you’ll field fewer questions from renters who’ve done their homework before they even book a viewing.
