As the Renters' Rights Act and Warm Homes Plan come into focus, buy-to-let lenders face a new era of property risk. Managing these interconnected tenancy and energy challenges requires more than standard stress tests. In this article we explore why lenders must transition to modern, centralised data platforms. Discover how real-time insights are essential to navigate legislation and safeguard portfolios.
Article by: Mark Blackwell, Chief Operating Officer, Cotality UK
Taking action
This year is going to be defining for buy-to-let lenders, with the Renters’ Rights Act reforms coming into force on 1 May 2026 and the looming Warm Homes Plan deadline falling in 2030. From lenders’ perspective, the first of these major policy changes is about cash flow and tenancy risk. The other is about the capital outlays required of landlords and property quality. Taken together, they are pushing lenders to re-examine what resilience means in a rental mortgage book and, crucially, what they need to know at an individual property level to measure it properly.
This year is going to be defining for buy-to-let lenders, with the Renters’ Rights Act reforms coming into force on 1 May 2026 and the looming Warm Homes Plan deadline falling in 2030. From lenders’ perspective, the first of these major policy changes is about cash flow and tenancy risk. The other is about the capital outlays required of landlords and property quality. Taken together, they are pushing lenders to re-examine what resilience means in a rental mortgage book and, crucially, what they need to know at an individual property level to measure it properly.
The Renters’ Rights Act marks the end of the current model of assured shorthold tenancies, scraps the section 21 no fault eviction route and imposes limits around rent increases and dispute and possession timelines. The Government’s Warm Homes Plan to raise energy efficiency in the private rented sector will require all private lets in England to reach a minimum equivalent of EPC band C by October 2030.
This matters for lenders and we are now seeing many take concrete steps to understand and manage the emerging risks these changes will bring. On the tenancy side, the Renters’ Rights package changes the dynamics of arrears management, timelines, possession and the stability of rental cash flows. Longer or less predictable routes to vacant possession can translate into higher expected arrears management costs, longer periods of non-payment and greater volatility in net rental income. These are not theoretical issues for a buy-to-let book. They affect the assumptions that sit under interest coverage, portfolio performance and capital planning.
The risks
On the energy side, the Warm Homes trajectory introduces a second channel of risk. Properties that need material upgrades face three pressures at once: the upfront cost of works, the disruption risk that can create voids and the possibility of a valuation discount where the market begins to price future lettability into poorer performing stock. For a lender, that is an underwriting issue at origination and a portfolio issue in the back book, particularly where five-year fixes and longer terms run straight through to 2030.
Most lenders already run standard rental affordability tests using stressed interest rates and interest cover ratios. What we are now seeing is a shift in the shape of the scenarios they are layering on. Lenders are increasingly pressure-testing rental income for longer voids, higher arrears incidence and slower resolution, reflecting the fact that enforcement timelines and dispute pathways can drive cash flow outcomes as much as headline rent levels. Stress tests increasingly need to ask whether a landlord has the ability and willingness to fund upgrades and what the valuation and rent profile looks like if they do not.
There is also a need to understand how these assessments affect a lender’s overall exposure. Single asset tests miss correlated risks. If a landlord owns a concentration of low EPC stock in the same region, the capital expenditure and potential letting constraints of upgrading properties are not independent events.
Lenders need more data
Managing all of this in practice means lenders require more data from more sources and with more detail. This requires technology that can function as a data highway with those at the front end of assessing these risks on a property by property basis – valuers.
For a long time, lenders have been circumspect when it comes to changing technology platforms in any area of their business – from origination to servicing. The risks associated with wholesale change – and the cost – have outweighed the potential commercial opportunities.
Now, we are seeing the market move on this at scale. Partly this is down to these changes in legislation and regulatory policy but there is also a growing recognition that data gaps affect cost of funds, the ability to meet compliance requirements and, soon, flex lending criteria and appetite with much more precision to manage their own risk exposures.
New partnerships
In recent weeks, we have been able to announce an important partnership with Yorkshire Building Society. The society has accelerated its digital transformation by adopting our Lender Hub, a centralised intelligence engine. The partnership marks a notable moment not only for Yorkshire Building Society but for the wider mortgage market.
We are now engaged in work to integrate several lenders into the Hub, marking a significant shift to consolidate property and environmental data into a single view. Customisable dashboards and dynamic reporting tools give access to more information and the ability to interpret it coherently, allowing underwriting judgements to be grounded in a fuller understanding of collateral exposure.
Real-time data insights and adaptive reporting allows institutions to monitor mortgage portfolios on an ongoing basis, track concentrations and ensure lending remains aligned with internal risk parameters. This kind of visibility supports earlier intervention where pressures are building and strengthens oversight in a market subject to valuation volatility and evolving regulatory expectations. It also allows lenders to tirage valuation instructions to prioritise physical assessments for higher risk homes.
Platforms fit for purpose
Integration with existing lending systems via API further embeds risk analysis within day-to-day workflows, supporting consistent, real-time portfolio management rather than periodic review. It is no longer a question of choosing between legacy systems and modern platforms that provide the flexibility and visibility that lenders need. It is now possible to augment and transition while mitigating the operational risk that change often brings.
