Renters' Rights Act 2025: What It Means for Buy-to-Let

Q: Has Section 21 no-fault eviction been abolished?

It has, as of 1 May 2026. If a landlord wants their property back now, they serve a Section 8 notice and have to name a proper legal reason for it, whether that is selling up, a family member moving in, or a tenant falling seriously behind on rent. Those legal grounds were broadened to fill the gap Section 21 left, and a number of them come with longer notice than the old rules demanded.

Q: How does the Renters' Rights Act affect buy-to-let mortgages?

The main effect is caution on the lender side. Slower possession and once-a-year rent reviews have pushed lenders to test deals harder, and some now want a bigger deposit, a lower loan-to-value, or more headroom on interest cover. None of this has closed the door on buy-to-let lending. It just means the figures have to be put together more carefully, and that is exactly where a good broker earns their fee.

Q: How should I stress test a buy-to-let deal under the new rules?

Run it three ways, and do not flatter the bad one. Put in sensible voids, realistic management and compliance costs, and rent that only lifts once a year instead of assuming a full house and steady increases. Then see how the coverage ratio holds when you crank up the stressed rate. A calculator built for the job, backed by a broker who knows the lenders, makes it far quicker to tell a resilient deal from a fragile one.

Q: Is buy-to-let still worth it after the Renters' Rights Act?

For anyone prepared to adjust, it can be. The Act lifts the management bar and takes away some wiggle room, so paper-thin deals are tougher to justify now. The landlords doing well are the ones running cautious numbers, sitting on a decent cash buffer and pushing for sharp terms. In the end it is about backing properties and structures that still stack up under the rules as they are today.

What the New Rules Mean for Landlords and Their Mortgages

The Renters’ Rights Act 2025 represents one of the most thorough and far-reaching changes to the UK buy-to-let market in decades. Introduced as the Renters’ Rights Bill, it received Royal Assent on 27 October 2025, and the main tenancy reforms came into force on 1 May 2026. The Act changes the rules around tenancies, evictions, and rent increases in significant ways, and that in turn affects how property investors decide to finance their purchases.

In this more risk-aware market, lenders and borrowers are refining their buy-to-let mortgage models, making smarter use of tools such as a buy-to-let mortgage calculator, and looking harder for the best buy-to-let mortgage deals. This blog looks at how the Act is reshaping BTL lending, what landlords can do about it, and how to review your mortgage options now the rules are in force.

Reviewing a buy-to-let deal under the new rules? Speak to a specialist first.

How the Renters’ Rights Act 2025 Affects Buy-to-Let

The main aim of the Renters’ Rights Act is to give tenants more security and rebalance the relationship between landlords and tenants in the UK rental market. The reforms apply in England. The headline changes now in force include:

Section 21 “no-fault” evictions have been abolished, so landlords can only seek possession on specific legal grounds using a Section 8 notice.
Fixed-term assured shorthold tenancies have been replaced by open-ended periodic tenancies.
Rent can only be increased once a year, to market rate, using a Section 13 notice, with tenants able to challenge an increase at tribunal.
Rental bidding is banned, and there are tighter rules on requesting rent in advance.
Landlord standards on letting, repairs, and compliance are being raised, with a private rented sector database and ombudsman to follow in later phases.

These changes have made landlords and lenders more cautious. When banks lend for a buy-to-let mortgage in the UK, they now pay closer attention to how stable the tenancy is, how well a landlord manages issues, and how robust their underwriting models are. Some landlords, especially those with small portfolios or thin margins, may decide to leave the sector, and possession claims fell in the run-up to the reforms as some landlords adjusted ahead of the changes.

Evolving Lending Models in the BTL Sector

Tougher Underwriting and Stress Tests

Lenders are asking more searching questions before they commit. Rental figures, void rates, repair budgets and regulatory risk all get pushed harder than they were a couple of years ago. A buy-to-let mortgage calculator helps here, since you can lay a best case, a base case and a bleak worst case next to each other. That worst case counts for more now, because rent can only move once a year and getting a property back takes longer than it used to. Expect some lenders to raise their interest coverage bar as well, leaving extra room for empty months or a dispute with a tenant.

Shorter Fixes, More Flexibility

To give themselves breathing space while the market settles, some lenders are nudging borrowers towards shorter fixed periods or split products. You will still find three and five-year fixes without much trouble, but watch the small print: a good number lock you in with early repayment charges that make walking away expensive.

Bigger Deposits, Tighter LTV

Risk pricing is creeping up. On a property or location that looks exposed under the new rules, a lender might ask for more deposit or trim the loan-to-value on offer. It comes back to the same instinct, which is to keep a thicker slice of equity in reserve in case the rent stops for a while.

Hybrid Structures

A few lenders are mixing things up with part interest-only, part repayment deals that sit more comfortably against the tighter rules, and one or two now fold in rental shortfall cover or extra covenants. Whichever way you go, run it through a calculator before you commit and make sure the deal still earns its keep once the new regime is applied.

Not sure whether your portfolio still stacks up under the Act? We can model it with you.

How to Use a Buy-to-Let Mortgage Calculator Effectively

A buy-to-let mortgage calculator has become an essential tool for landlords and property investors. These calculators usually let you enter:

The purchase price, deposit, and loan amount.
The interest rate, whether fixed or a variable mix.
The expected rental income.
The operating costs, including repairs, insurance, and management fees.
Assumptions for voids and cost inflation.

By modelling what happens under the Act’s rules, such as rent rising only once a year or longer possession timelines, you can see which deals remain financially viable. The calculator lets you stress test your leverage, coverage ratios, and margin of safety.

Running a range of “what-if” scenarios, from optimistic to pessimistic, helps you work out whether the best buy-to-let mortgage deals you are considering would still hold up if conditions worsened.

Frequently Asked Questions

What is the Renters' Rights Act 2025?

Think of it as the biggest rewrite of renting rules in England for decades. It cleared Parliament and got Royal Assent on 27 October 2025, with the main tenancy changes kicking in on 1 May 2026. The short version: no more Section 21 “no-fault” evictions, no more fixed-term assured shorthold tenancies now that they have become open-ended, rent rises capped at one a year, and an end to rental bidding. A landlord database, an ombudsman scheme and a Decent Homes Standard all arrive in later phases.

Has Section 21 no-fault eviction been abolished?

It has, as of 1 May 2026. If a landlord wants their property back now, they serve a Section 8 notice and have to name a proper legal reason for it, whether that is selling up, a family member moving in, or a tenant falling seriously behind on rent. Those legal grounds were broadened to fill the gap Section 21 left, and a number of them come with longer notice than the old rules demanded.

How does the Renters' Rights Act affect buy-to-let mortgages?

The main effect is caution on the lender side. Slower possession and once-a-year rent reviews have pushed lenders to test deals harder, and some now want a bigger deposit, a lower loan-to-value, or more headroom on interest cover. None of this has closed the door on buy-to-let lending. It just means the figures have to be put together more carefully, and that is exactly where a good broker earns their fee.

Can landlords still increase the rent under the new rules?

They can, though only once a year and only by following the Section 13 process to the letter. The new rent has to sit at a market level, and if the tenant reckons it is too steep they can take it to the First-tier Tribunal. That is a clear break from the old rent-review clauses that allowed more frequent hikes, and it is something lenders now weigh when they look at affordability.

How should I stress test a buy-to-let deal under the new rules?

Run it three ways, and do not flatter the bad one. Put in sensible voids, realistic management and compliance costs, and rent that only lifts once a year instead of assuming a full house and steady increases. Then see how the coverage ratio holds when you crank up the stressed rate. A calculator built for the job, backed by a broker who knows the lenders, makes it far quicker to tell a resilient deal from a fragile one.

Is buy-to-let still worth it after the Renters' Rights Act?

For anyone prepared to adjust, it can be. The Act lifts the management bar and takes away some wiggle room, so paper-thin deals are tougher to justify now. The landlords doing well are the ones running cautious numbers, sitting on a decent cash buffer and pushing for sharp terms. In the end it is about backing properties and structures that still stack up under the rules as they are today.

Final Thoughts

The UK rental market has changed considerably. Landlords now have to work within tighter rules on possession and rent increases. Even so, there are still sound investments for those who can adapt quickly. It is now important to use a buy-to-let mortgage calculator, build financial models with a larger cash buffer, and shop around for the best buy-to-let mortgage deals.

Investors who recognise the risks, stress test them, and secure good terms will continue to do well as lenders adjust. If you need help modelling your BTL portfolio under the new law, or you want deals reviewed for their potential, our team is happy to help.

Commercial Finance Network is a whole-of-market FCA authorised broker working with landlords, property investors, and businesses across the UK and internationally. We work across the full specialist buy-to-let mortgage panel and will tell you which lenders will engage with your deal, what LTV and rate to expect, and how to structure the application before anything is submitted. We are directly authorised and regulated by the Financial Conduct Authority. Your home may be repossessed if you do not keep up repayments on your mortgage.

Call us on 01494 622 111 or email info@cfnuk.com to speak to a specialist directly.

HMO Mortgage Challenges Under Tightened Rental Rules – how the changing rules are affecting HMO lending and deposits.
Buy-to-Let Landlords and Incoming EPC Standards – how investors are adjusting to the coming EPC requirements.
UK Commercial Buy-to-Let Mortgages Explained – criteria, rates, and structure for commercial BTL lending.
How Commercial Mortgage Lenders Assess Risk – the factors underwriters weigh when pricing a deal.
Commercial Mortgage Rates UK – current rate ranges by LTV band, property type, and borrower profile.

How the Renters’ Rights Act 2025 Is Reshaping Buy-to-Let Lending