How Much Equity Do You Really Need? Buy-To-Let Loan-to-Value Ratios Explained

One of the first questions landlords face when financing or refinancing a buy-to-let property is how much equity they will need. In other words, what loan-to-value (LTV) ratio is acceptable to the lender? The answer has a direct impact on your borrowing capacity, mortgage rate, cashflow and growth strategy. This article explains how lenders view LTV in 2025, typical thresholds in the market, and how landlords can use equity release responsibly.

What is Loan-to-Value (LTV)?

LTV measures the size of the mortgage against the property’s value, expressed as a percentage. For example:

• Property value: £200,000
• Mortgage: £150,000
• LTV = 75%

Lenders use LTV to assess risk. The lower the LTV, the more equity cushion there is in the property, which reduces the lender’s risk exposure. Higher LTVs carry higher risk and typically come with tighter affordability requirements and higher interest rates.

Typical Buy-To-Let LTV Thresholds in 2025

• 60% LTV – premium rates, lowest risk, but requires large equity or deposit.
• 70% LTV – still attractive pricing, reasonable balance between equity and borrowing.
• 75% LTV – most common ceiling in today’s buy-to-let market.
• 80% LTV – available with a handful of lenders but usually at higher rates and stricter criteria.

Above 80% LTV, products are extremely limited in 2025. This means landlords relying on high leverage may struggle to refinance unless rents are very strong.

How LTV Affects Interest Rates

The higher the LTV, the higher the rate is likely to be. Here is a simplified example for illustration only:

Note: These figures are indicative only and do not represent current product rates.

The Role of Rental Yield in LTV Decisions

Lenders do not look at LTV in isolation. They combine it with rental coverage tests. A property with a high rental yield can often sustain higher borrowing, while a low-yielding property may be capped at a lower LTV despite strong equity.

Example: An HMO generating £2,000 per month may easily support a 75% loan, whereas a city flat generating £850 per month may only justify a 65% loan under affordability stress tests.

The Risk of Over-Leverage

While high LTV borrowing can accelerate portfolio growth, it also increases exposure if rates rise, valuations fall, or rental voids occur. Over-leverage was a major factor in landlord difficulties during the financial crisis of 2008. Many lenders have since become more conservative, which is why 75% is now the de facto ceiling.

Landlords should ensure they have cashflow buffers and contingency planning in place before operating at the upper end of LTV allowances.

Strategic Use of Equity Release

One of the most powerful uses of LTV is refinancing to release equity for portfolio expansion. By remortgaging at a higher LTV, landlords can fund deposits for new acquisitions or capital improvements. The key is to balance growth with sustainable gearing.

Case Study: A landlord refinances a property valued at £250,000. At 60% LTV, the loan is £150,000. At 75% LTV, the loan becomes £187,500, releasing £37,500 of equity. This funds the deposit for another purchase without selling existing stock. The landlord’s overall gearing increases, but so does portfolio scale and long-term income potential.

Tips for Landlords Managing LTV in 2025

• Review LTV across your whole portfolio, not just individual assets.
• Consider reducing LTV on low-yield properties to improve stress test outcomes.
• Use HomeTrack or other AVM tools to track valuations before approaching lenders.
• Balance short-term expansion goals with long-term resilience and refinancing headroom.

Final Thoughts

LTV is more than a simple percentage; it is a central driver of affordability, lender appetite and borrowing cost. By understanding typical thresholds and how they interact with rental yields and stress testing, you can position your portfolio for sustainable growth in 2025.

Speak to Our Sponsor

Every landlord’s borrowing power is shaped by LTV. Some lenders restrict higher LTVs harshly, while others are more flexible depending on yields and property type. Our sponsor helps landlords review their portfolios, assess equity release options and source the most competitive deals.

Publication date: Monday, 15 September 2025