One Notice, Whole House Gone: The HMO Risk Most Landlords Missed After the Renters' Rights Act
Most HMO landlords assume one tenant leaving means one empty room to fill. Under the Renters' Rights Act, it can end the tenancy for the whole house, including tenants who never intended to move out. This piece explains why the risk is sharpest in the North East's converted terraces, what it actually costs an operator when it happens, and the checklist KLAP now runs before buying any HMO.
Since 1 May 2026, every tenancy in England is periodic, with a two-month notice period a tenant can serve at any time. Where an HMO is let on one joint tenancy, that notice does not just remove the tenant who served it. It ends the joint tenancy itself, for everyone named on it, on the date the notice expires. This is not new law. It is a fifty-year-old House of Lords ruling that fixed terms be kept dormant for a generation. Fixed terms are now gone, so the rule is live again. We walk through what it actually costs when it happens, why the corridor's HMO stock is more exposed than most people realise, and the underwriting question we now ask on every HMO we look at.
What actually changed on 1 May
The Renters' Rights Act abolished assured shorthold tenancies and fixed terms. Every tenancy that existed on 1 May 2026 became a periodic tenancy, and no new fixed-term tenancy can be granted from that date onward. A tenant can now end a periodic tenancy at any point by giving two months' written notice, expiring on or before a rent day, with no minimum stay and no fixed term to wait out.
That is a genuine improvement in flexibility for tenants, and it is not in itself the problem. The problem is what happens when more than one tenant is named on the same agreement.
The rule most landlords have forgotten
Where a property is let to several tenants under one joint tenancy, a periodic tenancy only continues because every party, including the landlord, keeps agreeing to it month by month. When one joint tenant serves valid notice, they are withdrawing their side of that agreement. In Hammersmith and Fulham LBC v Monk, the House of Lords confirmed that this ends the joint tenancy for everyone on it, regardless of whether the remaining tenants want to stay. That principle has not been touched by the Renters' Rights Act. If anything, it is more dangerous now, because it applies to periodic tenancies that exist from day one rather than only after a fixed term expires.
One clarification, because this point gets overstated. The notice ends the legal tenancy. It does not evict the remaining tenants on the spot. What it does is remove everyone's right to occupy under the original agreement, which forces the landlord to resolve the position of every remaining tenant, usually by offering fresh individual or joint agreements, inside the same two-month window that someone else's decision to leave has just opened. The clock is not optional and it was not started by the landlord.
Why this is a North East problem, not just a legal one
The Blyth to Middlesbrough corridor has a specific exposure here that a lot of national commentary misses. A large share of the corridor's HMO stock sits in Victorian and Edwardian terraces, the three and four-storey properties around Linthorpe in Middlesbrough, North Ormesby, central Stockton, Hendon and Millfield in Sunderland, and the terraced streets running off the seafront in Hartlepool. These houses were built as single-family homes and converted into shared accommodation over the last fifteen to twenty years, first for the student and young professional sharer market, more recently for working tenants priced out of self-contained lets by rent inflation. Because so much of this stock was converted by small, independent landlords rather than purpose-built HMO operators, the tenancy paperwork has tended to lag behind the physical conversion.
It is common to find a four or five-bedroom licensed HMO still let on a single joint AST template that was never updated when the property moved from a family let to a shared house, because under the old fixed-term system it did not matter enough to fix. That gap between how a property is licensed and how it is actually let is exactly what the Renters' Rights Act has just made expensive.
What this looks like in practice
The following is a composite, built from the kind of tenancy set-up we see regularly when reviewing HMO stock across the corridor. It is not a specific address or a specific tenant, but the mechanics are exactly what plays out on properties like it.
Picture a five-bedroom licensed HMO in a converted terrace, let to five working sharers on one joint tenancy agreement drawn up years ago, before the landlord had ever needed to think about individual lets. Rent is collected as a single monthly payment split informally between the tenants. One sharer accepts a job in Newcastle and serves two months' written notice, signed only in their own name. The other four assume, reasonably, that they simply carry on as before and the landlord finds a replacement for the one room.
That assumption is wrong. Because the tenancy is joint, that single notice ends the whole agreement on the date it expires, for all five tenants, not just the one who served it. The landlord now has two months to do three things at once: agree new terms with the four tenants who want to stay, work out whether the departing tenant's share of the deposit needs settling before the rest can be re-protected under fresh agreements, and find a new tenant for the vacated room, all before the original tenancy legally lapses. None of that is impossible. All of it is avoidable work that a room-only structure would never have created in the first place, and it is happening on a property where four out of five tenants never intended to leave.
What it actually costs
Take a fairly typical corridor HMO: four ensuite rooms letting at £425 a room, gross monthly income of £1,700. One sharer serves two months' notice. If the property is on a joint tenancy and the landlord cannot get agreement from the other three to vary it, the whole joint tenancy ends on the same date, not just that tenant's place in it.
Even where the landlord moves fast to offer the remaining three tenants fresh agreements and only genuinely loses one room, the position is worse than an ordinary single-room void. Every remaining tenant needs re-referencing and a new agreement, which is typically £25 to £40 per tenant through a standard referencing service. Deposits need re-protecting under the new agreements, which is an administrative cost even where the deposit itself simply carries over. The room itself needs remarketing and a standard clean, together a reasonable estimate of £150 to £250 depending on condition. If the council or lender needs updated tenancy evidence, that is another round of paperwork before rent can be counted as secure income again.
Set against £1,700 gross a month, a scenario like this can realistically cost an operator four to six weeks of full attention and several hundred pounds in direct costs, on a property that, on paper, only lost one tenant. Where a landlord cannot resolve the position with the remaining tenants quickly, or where more than one of them decides to also move on once the joint tenancy is unsettled, the exposure is the full £1,700 a month, not a fraction of it. That is the commercial reality behind what reads, in the legislation, as a single clause about notice periods.
What sophisticated operators now do
The fix is not complicated. HMOs can be let on a room-only basis, where each tenant or couple holds a separate agreement for their own room with shared use of communal areas. Under that structure, one tenant's notice ends only their own agreement. The other rooms, and the income from them, are untouched.
The value of this goes beyond avoiding one bad scenario. Individual agreements turn HMO turnover from a single, unpredictable event into a series of small, staggered ones, which is a fundamentally different risk profile to underwrite and to manage. Income becomes smoother because voids are spread across the year instead of landing all at once. That matters at refinance too. A lender or valuer assessing a portfolio's rental income wants to see a stable, demonstrable rent roll, and a property where the income depends on one joint agreement staying intact is a harder story to tell than one where four individual, replaceable tenancies sit behind the same rent roll. Operational resilience, in other words, is not just a management convenience. It is part of what makes an HMO refinance cleanly.
The KLAP Tenancy Structure Test
Every HMO we underwrite now goes through the same five questions before we consider the numbers on the deal itself.
One, is the property let on individual agreements or a single joint tenancy. Two, what class of HMO licence applies, and are the current tenants and room configuration actually compliant with it. Three, how are deposits protected, and does that protection match the current tenancy structure. Four, is rent collected individually per tenant or as one payment covering the whole property. Five, based on the current agreements, how many tenants could end the tenancy unilaterally today, and what is the true notice exposure on the property right now.
A tenanted HMO that fails this test is not necessarily a bad deal. It may simply need the tenancy structure corrected before or shortly after completion, and that cost belongs in the underwriting, not as a surprise six months in.
The takeaway
The Renters' Rights Act gets discussed mostly in terms of Section 21, possession grounds and the compliance calendar. The joint tenancy notice risk gets far less attention, and it is the one that can genuinely unsettle a shared house overnight and put real money on the table in re-referencing, void and remarketing costs. It is a fifty-year-old legal principle that fixed terms kept dormant for a generation. Periodic tenancies have woken it up.
If you're buying or managing HMOs in the North East, tenancy structure now deserves the same attention as EPCs, licensing and Article 4.
If you'd like us to review an existing HMO portfolio or a deal you're considering, we'd be happy to help.
FAQ
Can one tenant end a joint HMO tenancy for everyone else? Yes. Where an HMO is let on a single joint tenancy, one tenant serving valid notice ends the tenancy for all tenants named on it, under the Monk principle (Hammersmith and Fulham LBC v Monk, House of Lords). This has not been changed by the Renters' Rights Act.
What notice period applies under the Renters' Rights Act? A tenant can end a periodic tenancy by giving two months' written notice at any time, expiring on or before a rent day. There is no minimum stay.
Does ending a joint tenancy mean the other tenants are evicted immediately? No. The notice ends the legal tenancy on the date it expires. The remaining tenants are not removed that day, but their right to occupy under the original agreement ends, and the landlord must resolve new terms with each of them before the notice runs out.
How can landlords avoid the joint tenancy notice risk in an HMO? By letting on individual, room-only agreements rather than one joint tenancy for the whole property. Under that structure, one tenant's notice only ends their own agreement.
Why does this matter more in the North East corridor? A large share of HMO stock in Middlesbrough, Stockton, Sunderland and Hartlepool sits in converted Victorian and Edwardian terraces, often still let on joint AST templates that were never updated when fixed terms disappeared. That gap between licensing and tenancy paperwork is what the Renters' Rights Act has now made costly.
Sources:
Hammersmith and Fulham LBC v Monk [1992] 1 AC 478 (House of Lords)
Renters' Rights Act: Government information sheet — GOV.UK
How joint tenancies work under the Renters' Rights Act — The Independent Landlord
RRA: Joint Tenancies, the New Rules — Student Housing
Tenant notice periods under the Renters' Rights Act from 1 May 2026 — mydeposits
Renters' Rights Act: tenancies agreed before 1 May 2026 — NRLA
Note on rent and cost figures: the £425/room and refurbishment-adjacent cost estimates above are set deliberately close to KLAP's published corridor HMO rent guide (£375 to £420 per room) rather than invented for effect. The referencing, cleaning and remarketing figures are typical operator costs, not sourced from a specific invoice, and are flagged as estimates rather than presented as verified data.
Keeshan | KLAP Property Group klappropertygroup.com