Knight Frank describes the Renters' Rights Act as largely counterproductive three months after it came into force. London rental supply is 13% below the five-year average. Six tenants are chasing every new rental property in prime areas. When a policy designed to lower rents raises them instead, the question for every BTL landlord is whether they are positioned in the right market to benefit from that consequence.
What Has Happened?
The Renters' Rights Act, which received Royal Assent in October 2025 and came into force on 1 May 2026, reshaped the private rented sector more substantially than any legislation since the Housing Act 1988. Fixed-term tenancies no longer exist. Section 21 is gone. Rent can only increase once per year via a formal Section 13 notice using the new Form 4A. Landlords cannot collect more than one month's rent in advance from new tenants. Competitive bidding above the advertised asking rent is now unlawful.
The government's stated aim was to protect tenants from insecurity and affordability pressure. Three and a half months in, Knight Frank's research team describes the Act as largely counterproductive. Their August 2026 analysis draws on Rightmove data showing new rental listings in prime central and prime outer London ran 13% below the five-year average in May 2026, and 11% below the same month in 2025. Knight Frank tracked six prospective tenants for every new rental property coming to market in prime London during May, the highest ratio since September 2022. The supply of rental homes fell. The renters who depended on it did not go anywhere.
Prime outer London rents rose 3.2% in the year to May 2026. Monthly growth of 0.5% in May was the sharpest single-month increase recorded since September 2023. Prime central London saw 1% annual rental growth. Neither figure suggests the affordability pressure that the Act was designed to reduce has actually reduced. In London, it has intensified.
A separate force is running at national level. Net migration to the UK fell sharply in 2025 and into 2026 as government visa restrictions took effect. Zoopla's Q1 2026 rental market data found demand for rental homes running 14% below year-earlier levels, with lower migration identified as the primary driver. Eleven percent more homes are available to rent nationally than in 2025. National rents are growing at roughly 2 to 3% in 2026. That national picture, often cited as evidence the rental market is calming, is a real phenomenon. But it reflects migration policy, not the Renters' Rights Act.
The Hello Neighbour letting agency identified a specific mechanism by which the Act is pushing initial asking rents higher, even in markets where underlying demand has not strengthened. Under the Act's rules, landlords and agents cannot legally accept offers above the advertised asking rent. This has changed how properties are priced. Landlords now set the asking rent at the ceiling of what the market will bear, rather than advertising conservatively and taking competitive offers above it. The Section 13 process for mid-tenancy increases is also more formal and less flexible than a direct landlord-tenant agreement. The rational response is to price the full expected rent growth into the initial listing rather than adjust incrementally over the tenancy.
Why This Matters to UK Property Investors
The mainstream coverage of the Renters' Rights Act has focused on landlord exits and compliance burden. That framing is accurate. But it is not the most useful one for investors deciding what to do now. The more practical question is: in a divided market, where are supply and demand moving in ways that help BTL investors who have chosen to stay?
In London, supply is contracting where demand remains strongest. Prime central London, prime outer London, and the more expensive commuter zones are where landlord exits are most concentrated, because those are the markets where regulatory overhead relative to yield is least favourable. A landlord with two flats in Fulham yielding 4.5% gross has far less margin to absorb compliance costs, EPC C retrofit obligations, and management fees than a landlord running terraced houses in Leeds at 7.2%. The thin-yield London landlord is the seller. The professional operator in the north is increasingly the buyer.
Six tenants per new rental in prime London, rents up 3.2% year-on-year, supply 13% below average. Those numbers describe a market that is working well for landlords who are still in it. Not because landlords engineered it that way. Because policy removed others from the market and the renters those landlords were housing did not disappear with them.
The national picture diverges. Fourteen percent lower demand year-on-year, 11% more available stock, rents growing at 2 to 3% rather than 6-plus percent in constrained markets. That describes a sector approaching equilibrium in aggregate, though the equilibrium point differs substantially by city. Manchester, Birmingham, Nottingham, and Sheffield sit within the national picture in terms of migration-driven demand softening. They also carry yield profiles that make staying viable. Rightmove's August 2026 report shows North West rents at all-time highs even within that softer national demand environment, because supply exits in those markets have outpaced the migration-driven demand fall.
For investors, the two-speed market creates a clear decision. London at 5.58% average gross yield per Paragon Bank's Q2 2026 survey, rising rents, rising compliance cost, high entry price. Northern cities at 7.5% to 9% yields, rent growth at 5 to 7% annually, lower entry price, a more active mortgage market. The Act's unintended consequence of pushing rents up via supply restriction works better for investors already holding stock than for buyers entering the market now at current prices, where some of the future rent growth is already embedded in the valuation.
The Risks Investors Need to Understand
The supply squeeze in London may not persist in its current form. Thirteen percent below the five-year average in rental listings is a snapshot. If further Bank of England rate cuts improve remortgage affordability for leveraged landlords who were planning to sell, some of those sales may not proceed. The six-tenants-to-one-property ratio eases fairly quickly when supply improves by even a few percentage points. Investors buying London property now at yields of 4.5% to 5.5% are pricing in continued supply constraint to sustain rents. That is a thinner margin of safety than the headline numbers suggest.
The prohibition on above-asking offers creates a different risk that is easy to overlook: prolonged void periods. Before the Act, a landlord pricing conservatively could fill a property quickly by accepting a competitive bid above asking. That mechanism no longer exists. If the asking rent is set at the ceiling and the ceiling shifts downward because of migration-related demand softening, properties sit empty longer. Investors should model void assumptions more conservatively than the pre-May 2026 market warranted.
The Section 13 formal rent review process needs active management. Form 4A must be served with at least two months' notice. Tenants can refer proposed increases to the First-tier Tribunal (Property Chamber). A well-prepared landlord with documented comparable market evidence is in a defensible position at tribunal. The process is not complex. But it is formal, it creates a paper trail, and it takes longer than an informal agreement. Landlords running properties without professional management and without a systematic approach to rent review records are creating an administrative liability that will catch up with them on the first contested increase.
County court possession timelines have not improved since May. Average possession proceedings in England were running at 20 to 24 weeks in early 2026, and that figure has not materially shortened under the Act. Ground 1A, which permits possession where a landlord intends to sell the property, cannot be served until 12 months into a tenancy. Investors who acquired expecting flexibility to sell within the first year of a tenancy no longer have that option. That constraint is now structural, not temporary.
There is also a broader political risk at national level. PM Andy Burnham took office on 20 July 2026 and has publicly stated he is examining rent control options for England, including potential Mayoral area pilots. A survey of build-to-rent fund managers found 100% said they would reduce investment and avoid Mayoral areas if rent controls were introduced. Private BTL landlords in Greater Manchester and other Mayoral areas cannot exit as fast as institutional capital, but the same policy logic applies. This risk is speculative. But it is not hypothetical.
Where the Opportunity Could Be
The clearest opportunity sits with investors already holding compliant, professionally managed stock in markets where supply is constrained and tenant demand is not primarily migration-dependent.
Manchester's professional renter population in M4, M5, and M15 postcodes is not substantially affected by the migration fall. These are employed professionals in financial services, healthcare, and the digital economy, not recent international arrivals. Knight Frank's own Manchester lettings data shows city-centre rents up 4.1% in the year to May 2026, with demand from the corporate and professional tenant segment still outpacing supply. Entry-level BTL in those postcodes: one-bed flats at £140,000 to £175,000 achieving £950 to £1,100 per month, generating gross yields of 7.9% to 9.4%.
Birmingham B5 (Digbeth) and B15 (Edgbaston) deliver two-bedroom stock at £155,000 to £195,000 with monthly rents of £925 to £1,100, producing gross yields of 6.8% to 8.5%. Digbeth continues to attract creative and media businesses. Edgbaston draws medical and academic tenants anchored to Queen Elizabeth Hospital and the University of Birmingham. Neither cohort is migration-sensitive in the way that a high-migration-dependent city-centre flat market would be.
Nottingham NG1 and NG7 near the city centre and university offer one-bed stock at £90,000 to £130,000 with rents of £650 to £825 per month, generating gross yields of 7.6% to 9%. Nottingham already has extensive Article 4 HMO restrictions, which has kept the conversion pipeline constrained. For investors in single-let property, that HMO supply ceiling is a benefit: less competing rental stock entering the sub-market from conversion activity.
For investors weighing London exposure despite the thin yields, Zones 3 to 5 commuter postcodes make more sense than prime central or prime outer. Walthamstow E17, Lewisham SE13, and Tottenham N17 produce gross yields of 6.2% to 6.7% on stock priced at £280,000 to £380,000. Tenant demand in those postcodes is anchored by NHS employment, established transport links, and existing community networks rather than new migration. They are also the postcodes from which landlord exits have been most visible in 2026, tightening supply further without reducing demand from existing tenant populations.
Arsh's Investor View
When the Renters' Rights Act was making its way through Parliament in 2024, I was fairly open about my expectation that it would push supply down and rents up in constrained markets. Not because I wanted that outcome. Because the mechanism was obvious: increase costs and regulatory complexity for individual landlords where yields are already thin, and a portion of them sell. Fewer homes to rent means higher rents for the tenants who remain. Knight Frank calling the Act largely counterproductive in August 2026 is confirming the predictable. I do not find that particularly satisfying.
What I find more interesting is where the divergence actually sits. In London, the Act has tightened supply in markets where demand is already structurally strong. In northern cities, the supply constraint is coming through a slightly different mechanism: yields at 7.5% to 9% mean more professional operators can absorb the compliance overhead and stay in the market, so exits are fewer in number. The migration fall is softening northern demand somewhat. But it is not softening it enough to close the gap with supply in cities like Manchester, Birmingham, and Nottingham.
My own portfolio has been structured around company ownership since 2017. The Renters' Rights Act did not fundamentally change my operating model because I had already built for a more regulated environment. Professional management, documented rent review processes, proper licensing. The things the Act now requires from everyone were already in place. That is not me claiming foresight. It is me saying that running property like a business rather than a passive investment has always been the correct approach, and the Act has just made the cost of not doing it much higher.
I want to be honest about the rent control risk. I do not know whether Burnham will introduce controls in England or how far they would extend. Scotland's experience from 2022 onward is not encouraging for anyone who believes controls achieve their stated goal: exits accelerated, supply fell, and rents rose sharply when controls were eventually lifted. That sequence is well documented and not contested. If I hold property in Greater Manchester, I am watching the policy development from Burnham's government closely and keeping more liquidity than I might otherwise carry. That is the honest thing to say.
How Property Investor App Can Help
Property Investor App connects buy-to-let investors with opportunities in the markets where the Renters' Rights Act's supply effects are most concentrated and where tenant demand remains strongest relative to available stock. For investors assessing Manchester, Birmingham, Nottingham, and North East England, PIA provides live deal data by postcode, yield, and property type, enabling direct comparison before committing capital. For landlords checking whether their existing portfolios are compliant with the Act's revised requirements, including Section 13 Form 4A rent review procedures, the Ground 1A 12-month minimum tenancy condition, and the advance rent prohibition, PIA's network includes property managers and solicitors specialising in post-May 2026 tenancy law. For investors looking to acquire from individual landlords exiting personal ownership in London and major cities, PIA surfaces landlord-to-landlord sale opportunities not reaching the open market. Browse live UK property investment opportunities at Property Investor App.
Key Takeaways
- Knight Frank's August 2026 research describes the Renters' Rights Act, which came into force on 1 May 2026, as largely counterproductive. New rental listings in prime central and prime outer London were running 13% below the five-year average in May 2026, and 11% below the same month in 2025. Six prospective tenants competed for every new rental property in prime London during May, the highest ratio since September 2022. Prime outer London rents rose 3.2% in the year to May. The tenant population that exiting landlords were housing did not leave the rental market with them.
- The Act's prohibition on above-asking-rent offers has changed initial rent-setting behaviour. Landlords are now setting asking rents at the ceiling of what the market will bear from the first day of a listing, rather than testing conservatively and accepting competitive bids. The formal Section 13 / Form 4A process for mid-tenancy rent increases is less flexible than a direct agreement, pushing landlords to price full expected rent growth into the initial asking rent rather than adjust incrementally. Hello Neighbour cited this dynamic in August 2026 commentary.
- The national rental market picture differs from London. Lower net UK migration has reduced rental demand 14% below year-earlier levels nationally, with Zoopla identifying migration as the primary driver. Eleven percent more homes are available to rent nationally than in 2025. National rents are growing at roughly 2 to 3% in 2026. This is a real moderation, but it is explained by migration policy rather than the Renters' Rights Act. The two forces are producing different outcomes in different parts of the country.
- Greater London average gross BTL yield stands at 5.58% per Paragon Bank's Q2 2026 survey, the lowest of any UK region and very close to company BTL mortgage rates of 5.2% to 5.4%. Northern city yields (North West 7.84%, North East 7.97%, Yorkshire and Humber 7.58%) provide substantially more headroom for compliance overhead, voids, and management fees. Investors entering the market now should model the arithmetic carefully: some of the supply-squeeze rent growth benefit is already priced into London property values at current entry levels.
- Investors who have moved to limited company BTL structure in high-yield northern markets and hold compliant, professionally managed stock are operating in an environment where individual landlord exits are improving their competitive position. The Act adds compliance overhead; it does not eliminate the investment case for well-positioned, properly structured operators. Ground 1A possession (sale intent) cannot be used until 12 months into a new tenancy. County court possession timelines in England remain 20 to 24 weeks. Both are structural constraints that professional operators already plan around.
Frequently Asked Questions
How has the Renters Rights Act affected rental supply in the UK?
Three months after coming into force on 1 May 2026, the Act has had divergent effects on rental supply by geography. In prime London, new rental listings were running 13% below the five-year average in May 2026 and 11% below the same month in 2025, according to Rightmove data cited by Knight Frank. Six prospective tenants competed for every new rental property in prime areas during May, the highest ratio since September 2022. This supply compression reflects accelerated landlord exits, particularly from low-yield London markets where the compliance overhead relative to income is least sustainable. Nationally, 11% more homes are available to rent than a year ago, driven primarily by lower net migration reducing demand rather than an increase in supply. The national headline and the prime London reality are measuring different things.
Why are rents rising despite the Renters Rights Act being designed to protect tenants?
Two mechanisms are working against the Act's stated aims. First, more landlords have sold their properties since May 2026 than the government anticipated, reducing the stock of rental homes available. The renters those properties housed did not leave the market; they compete for the reduced supply that remains. Second, the Act's prohibition on above-asking-rent offers has changed how landlords price properties at the point of listing. Before May 2026, a landlord could advertise conservatively and accept competitive bids above asking price. Now the asking rent is the ceiling. Landlords and agents are responding by setting the initial asking rent at the level they want to achieve from day one, rather than leaving room for upward adjustment. The formal Section 13 process for mid-tenancy increases adds further incentive to set the initial rent high. Agents including Hello Neighbour described this dynamic in August 2026 commentary on the Act's effects.
Is it still worth investing in buy-to-let in 2026 given the Renters Rights Act?
The investment case depends on geography, structure, and yield far more than on the Act in isolation. In Greater London, average gross BTL yields of 5.58% (Paragon Bank Q2 2026) sit very close to company BTL mortgage rates of 5.2% to 5.4%, leaving thin margin for voids, management fees, and EPC compliance costs. Northern cities (North West 7.84%, North East 7.97%, Yorkshire and Humber 7.58%) provide substantially more headroom. The professional SPV structure retains full mortgage interest deductibility against rental income that personal ownership does not. Investors who have moved to company BTL in high-yield northern markets and hold legally compliant, professionally managed stock are in an environment where supply contraction from individual landlord exits is strengthening their competitive position. The Act adds overhead. It does not eliminate the case for professional operators in the right markets.
What is the Section 13 Form 4A rent increase process under the Renters Rights Act?
Section 13 of the Housing Act 1988, as modified by the Renters' Rights Act 2025, is the statutory mechanism for proposing a rent increase to an existing tenant. The landlord serves Form 4A specifying the proposed new rent and the date it takes effect, with at least two months' notice. The new rent cannot take effect more than once in any 12-month period. If the tenant disagrees with the proposed increase, they can refer it to the First-tier Tribunal (Property Chamber), which sets the rent at the market level based on comparable evidence. A landlord with well-documented market comparables is in a defensible position at tribunal. The process is more formal than a direct landlord-tenant agreement and requires advance notice planning. Landlords who previously relied on informal annual adjustments need to operate within this statutory timeline from May 2026 onward.
How does lower migration affect UK rental demand in 2026?
UK net migration fell significantly in 2025 and into 2026 following government visa restrictions. Zoopla's Q1 2026 rental market data puts rental demand 14% below year-earlier levels nationally, with lower migration identified as the primary driver. The effect is most concentrated in large urban areas where significant rental demand growth from 2022 to 2024 was driven by international arrivals. It is less significant in markets where professional tenant demand is primarily domestic: NHS trust campuses, commuter belts, and university cities with large UK domestic student populations. Investors in Manchester, Birmingham, Nottingham, and North East England are more insulated from the migration demand fall than those with heavy London exposure. National rental supply running 11% above year-ago levels reflects this demand softening rather than a structural improvement in housing availability.
