Most coverage of the Renters’ Rights Act has focused on what landlords must do with tenants. Less attention has gone to the other side of it: your buy-to-let mortgage conditions were written for a world of fixed-term assured shortholds and section 21, and that world ends on 1 May 2026.
What actually changes
From 1 May 2026, section 21 no-fault evictions are abolished and existing fixed-term assured shortholds convert to periodic tenancies. Possession runs through section 8 grounds instead — rent arrears, landlord sale, landlord or family moving in, and the rest of the schedule — each with its own notice period and evidential requirement.
Rent increases move to a statutory mechanism with a right for the tenant to challenge at tribunal.
Your mortgage conditions almost certainly say “assured shorthold tenancy”
This is the practical problem. Standard buy-to-let mortgage conditions have for years required the property to be let on an assured shorthold tenancy, frequently with a stated minimum and maximum term — typically six to thirty-six months. Some conditions specify the tenancy type explicitly and make anything else a breach.
Lenders have been updating their standard conditions to reflect periodic tenancies, and most mainstream buy-to-let lenders have now done so. But the obligation is yours, not theirs:
- Read your current mortgage conditions on every property in the portfolio, including older loans taken out years ago.
- Where the conditions are out of date, get written confirmation from the lender that a periodic tenancy under the new regime is acceptable. Keep it on file.
- Check the conditions on any consent-to-let arrangement separately — these are often more restrictive than a full buy-to-let product.
A technical breach of tenancy conditions rarely causes a problem while payments are made. It becomes a problem at refinance, at sale, or if the lender ever needs to enforce.
Why lenders care: the security is possession
A buy-to-let lender’s ultimate protection is the ability to take the property with vacant possession, or to appoint a receiver of rent and continue letting it. Section 21 made the first of those quick and certain. Its removal makes possession slower and more contested, which raises loss-given-default across the sector.
Expect that to work through into criteria rather than into headlines: slightly tighter stress testing on some products, more attention to void assumptions, more scrutiny of tenant type and of properties with existing arrears.
What to expect in stress testing and underwriting
Interest cover tests are unlikely to change dramatically in the short term, but the underwriting conversation around them is shifting:
- Void assumptions. Longer possession timescales mean a problem tenancy ties up the asset for longer. Build a realistic void allowance into your own projections, not just the lender’s.
- Arrears history. Existing arrears on a property being refinanced now matter more, because the route to resolving them is slower.
- Tenant type. Student, HMO, company let and social housing lettings each have their own criteria, and each interacts with the new regime differently.
- Portfolio-level review. With four or more mortgaged properties you are a portfolio landlord, and the lender assesses the whole portfolio — so one problem tenancy can affect an application on an unrelated property.
Practical steps for the next refinance
- Pull the mortgage conditions for every mortgaged property and check the tenancy clause.
- Update your tenancy agreements to the new statutory form, and keep the old ones on file.
- Make sure deposits are correctly protected and prescribed information served — defects here restrict section 8 possession as well as creating their own liability.
- Keep clean rent records. Arrears grounds are evidential, and a tidy schedule is worth a great deal if you ever need it.
- Review your rent levels against the statutory increase mechanism before you apply, because the rent figure drives the interest cover calculation and therefore the loan.
- Check your landlord insurance covers legal expenses and rent guarantee on the new basis.
Where this changes the investment case
For lightly geared landlords with long-standing tenants, very little changes commercially. For highly geared portfolios running on thin cover, a longer possession timeline is a real cash-flow risk, and it sits alongside the EPC C obligation arriving in 2030.
That combination is pushing some landlords to consolidate — selling the weakest properties and refinancing the rest onto longer fixes for certainty. Whether that is right for you depends on gearing, yield and how long you intend to hold.
Refinancing a portfolio this year? Send us the schedule and the current mortgage conditions, and we will flag anything that needs dealing with first.
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Most buy-to-let mortgages, and some forms of commercial, bridging and development finance, are not regulated by the Financial Conduct Authority. Your property may be repossessed if you do not keep up repayments on a loan secured against it. Giles Finance is authorised by the Financial Conduct Authority (No. 726857) to transact regulated mortgages. Giles Finance is a trading style of Giles Finance & Consultancy Services. This article is general information, not advice.