Is My Landlord Running an Illegal HMO? UK Guide

An HMO, House in Multiple Occupation, is a property where three or more people from more than one household live together and share facilities like a kitchen or bathroom. That covers the student house with five tenants, the bedsit building with shared bathrooms, and plenty of properties that landlords prefer not to label as HMOs.

The mandatory licensing threshold is higher: five or more occupants forming two or more separate households. At that point, your landlord must hold a mandatory HMO licence regardless of where in England the property is. No exceptions, no grace period.

Below five occupants, the rules depend on your local council. Many local authorities operate additional licensing schemes that bring smaller HMOs into the net. A three-person house in one borough might require a licence. The same setup a mile away in a different council area might not. This is where tenants often get confused, and where landlords who know the system hope you won't check.

The definition of a 'household' matters here. Two friends who rent together count as one household. A couple and their children count as one household. Five unrelated people each count as a separate household. So a property with five unrelated people sharing is almost certainly within mandatory licensing territory.

For a fuller breakdown of how HMO licensing works and what different licence types cover, see our guide on HMO Licensing UK: What Tenants Need to Know.

The most direct route is your local council's public licensing register. Most councils publish this online, searchable by address. Type your property address in and see whether a valid licence appears. If no record exists, that's your starting point.

GOV.UK also provides an HMO licence finder that covers England. It's worth trying both the council's own register and the GOV.UK tool, because data isn't always updated simultaneously across systems.

You can also ask your landlord directly. Put the request in writing, by email or text, so you have a record. A landlord with a valid licence should be able to forward you a copy immediately. Delay or deflection is itself useful information.

Tools like LetCompliance offer a free mandatory HMO licence checker based on occupant numbers and household composition. HMO Checker provides more detailed feasibility reports, including planning data, for a fee starting at £15.99 per report. These aren't substitutes for checking the actual council register, but they're useful for a quick first assessment.

Remedy Legal's Housing Data Search feature includes a searchable database of HMO licences, which you can use to check your property's status before deciding whether to pursue a claim.

If you want to understand whether your specific property qualifies as an illegal HMO, start with your council's register. Everything else follows from that answer.

Operating an HMO without the required licence is a criminal offence under the Housing Act 2004. That has been true for years. What changed on 1 May 2026 is the scale of the consequences.

From that date, landlords face civil penalties up to £40,000 per offence. Enforcement actions have risen 180% since 2018 (GOV.UK enforcement data, 2026), so councils are looking harder, not less hard. An unlicensed landlord who ignored the rules in 2022 and faced little consequence is now operating in a very different environment.

For tenants, the significant change is the Rent Repayment Order window. Before 1 May 2026, you could recover up to 12 months of rent through a Rent Repayment Order. For offences continuing from or starting after 1 May 2026, that rises to 24 months. If you've been paying £1,200 a month in an unlicensed HMO, 24 months of that is £28,800. That's what's potentially recoverable.

There is one important tactical point about unlicensed HMOs that many tenants don't know: a landlord operating without a licence cannot serve a valid Section 8 notice against you for many of the standard grounds. The unlicensed status restricts their eviction options. If your landlord is currently threatening to evict you and you suspect the property is unlicensed, check the licence status before engaging with any notice they've issued.

For the full picture on how Section 8 evictions work and how to respond to one, see our guide on Section 8 Notice Grounds, Rights and How to Respond.

A Rent Repayment Order is a formal order from the First-tier Tribunal (Property Chamber) requiring your landlord to repay rent you've already paid during the period the property was unlicensed. You don't need a solicitor to apply. You do need to be organised.

Here is the process in plain terms.

Step 1: Confirm the offence. Get written confirmation from your local council that no licence was held during the period you were paying rent. An email from the council's housing or licensing team stating the property had no valid licence is strong evidence. Report the property to the council too: this triggers a formal investigation, which strengthens your case at tribunal.

Step 2: Gather your evidence. You need your tenancy agreement, rent payment records (bank statements showing each payment, or receipts), and any correspondence with your landlord about the property. The more complete your rent payment trail, the larger the repayment the tribunal can award.

Step 3: Apply to the tribunal. Complete form RR01 and submit it to the First-tier Tribunal (Property Chamber) for your region. There is a fee, though fee remission is available if you're on a low income. You must apply within 12 months of the date the offence ended, so don't delay once you have the council confirmation.

The tribunal will set a hearing date. At the hearing, you present your evidence. The landlord can attend and respond. The tribunal then decides the amount to award, up to the maximum recoverable.

For a full step-by-step breakdown of completing the RR01 form, see our guide RENTS1 Form: How to Complete It Step by Step.

Remedy Legal's RRO Eligibility Check can assess your situation and generate a formatted tribunal bundle from your uploaded evidence, with deadline tracking built in. The platform's Claim Valuation feature gives you an estimated range based on data from similar past cases, so you go into the tribunal knowing what to expect.

Tribunal panels for Rent Repayment Order cases want to see two things clearly: that an offence was committed, and that you paid rent during the period of that offence.

On the offence: a letter or email from your council confirming no licence was held during the relevant period is close to decisive. If the council is still investigating, a letter confirming the investigation is underway is still useful. Tribunal panels are experienced at weighing this kind of administrative evidence.

On the rent payments: bank statements are the cleanest form of proof. If you paid in cash, receipts or a rent book are the alternative. Payments made through a letting agent are usually traceable through your bank records and any agent statements you received.

Your tenancy agreement establishes the rental figure and the start of the tenancy. If the tenancy agreement names the property, that links the evidence together.

One thing tribunals look at carefully: whether you knew the property was unlicensed when you agreed to rent it. This doesn't automatically disqualify your claim, but it can affect the amount awarded. In practice, most tenants don't ask for an HMO licence check before signing, and tribunals are realistic about that.

For a detailed breakdown of what to include in your submission, see Rent Repayment Order Evidence UK: What to Include.

Yes. A Rent Repayment Order claim can be made after you've moved out, provided you apply within 12 months of the date the offence ended. The offence ends when the landlord obtains a licence, when you leave the property, or when the property stops being an HMO, whichever comes first.

If you left six months ago and the property was unlicensed throughout your tenancy, you still have time. If you left 13 months ago, you're outside the window and cannot claim.

This 12-month limit is strict. The tribunal has no discretion to extend it. If you're reading this and thinking that might be your property, check the council register today and get the council's written confirmation as quickly as possible. The clock runs from when the offence ends, not from when you find out about it.

Current tenants also have standing to bring a claim while still living in the property. You don't have to move out first. Some tenants worry about landlord retaliation if they bring a claim while still in situ. The Renters' Rights Act 2025 includes protections against retaliatory eviction: if your landlord serves a notice shortly after you make a complaint or bring a claim, that notice can be challenged.

For more on what those protections look like in practice, see our guide on Landlord Retaliation Eviction UK Tenant Rights.

Remedy Legal is an AI-powered platform built to help UK renters pursue claims against landlords, including Rent Repayment Order claims for unlicensed HMOs.

If you're asking whether your landlord is operating an illegal HMO in the UK, Remedy's starting point is a free instant assessment. You share the key details of your situation and get a clear read on your legal position, including whether you're likely eligible for a Rent Repayment Order and what range of repayment you could pursue. No credit card required at that stage.

For tenants who want to go further, the £40 platform tier covers the full claims process: AI-drafted letters to your landlord and to Environmental Health teams citing the relevant legislation, a formatted tribunal bundle built from your uploaded evidence, and deadline tracking so you don't miss the 12-month application window. The Claim Valuation feature draws on data from similar past cases to give you a realistic settlement range before you commit to filing.

If you want expert human input, Remedy's no-win-no-fee tier includes a video consultation with a housing expert, document review, and strategic guidance. The fee is 10% of your winnings, charged only if the claim succeeds.

Remedy is not a law firm and cannot represent you at a tribunal hearing. What it does is prepare you to present your own case effectively, or to hand a complete, well-organised bundle to a solicitor if you choose to instruct one.

You can also reach Remedy via WhatsApp if you prefer that to the web platform.