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The deposit is often the biggest barrier to buying an HMO. It is the lump sum that stops deals in their tracks and forces investors to wait another year before they can move. And for HMO mortgages specifically, the deposit requirements are higher than standard buy-to-let — sometimes significantly so.
Understanding exactly how much you need, what affects the number, and how to structure things to keep it as low as possible can make the difference between getting your next HMO deal over the line and watching it slip away. This guide breaks down HMO mortgage deposit requirements in detail, so you know exactly where you stand before approaching lenders.
To estimate your borrowing based on different deposit levels, try our HMO mortgage calculator.
The Short Answer: 20% to 35%
For most HMO mortgages in 2026, you will need a deposit of between 20% and 35% of the property's purchase price or valuation — whichever is lower. That translates to a loan-to-value (LTV) ratio of 65% to 80%.
The most common deposit requirement is 25%, which gives you a 75% LTV. This is the sweet spot where the majority of HMO lenders operate and where you will find the widest choice of products and the most competitive rates.
However, the exact amount depends on several factors, and it is entirely possible to need more or less than 25%. Let us look at what drives the number up or down.
How Property Size Affects Your Deposit
The size and classification of your HMO is the single biggest factor in determining deposit requirements.
Small HMOs (3-6 Bedrooms)
A standard HMO with three to six lettable bedrooms that falls within Use Class C4 is the simplest type to finance. Many lenders treat these similarly to standard buy-to-let properties, particularly if the property has a conventional residential layout.
For more on this topic, see our guide to From Bridging Finance to HMO Mortgages: Successful Stories.
For small HMOs, deposits typically start from 20% to 25%. Some lenders will go as low as 15% for properties at the smaller end (three to four bedrooms) with strong rental yields and an experienced landlord behind the application. At 75% LTV, you will have access to the broadest range of products.
Large HMOs (7+ Bedrooms)
Once a property has seven or more lettable bedrooms, it is classified as a large HMO and requires a mandatory licence from the local authority. Many properties of this size fall into sui generis planning use, which means they need full planning permission rather than just falling within permitted development.
Lenders view large HMOs as higher risk. Fewer lenders operate in this space, and those that do typically require deposits of 25% to 40%. A 30% deposit is common for large HMOs, and for particularly complex properties — those with 10 or more bedrooms, commercial elements, or unusual layouts — 35% to 40% is not unusual.
For more on large HMO finance specifically, see our large HMO mortgage guide.
Converted Properties and Non-Standard Construction
If your HMO has been converted from a commercial building, has non-standard construction (such as timber frame, concrete panel, or steel frame), or has a mixed-use element, expect deposit requirements at the higher end. Lenders add a risk premium for anything that deviates from a standard brick-built residential property.
Your Experience as a Landlord
Lender confidence in the borrower matters, and experience is a significant factor in HMO mortgage pricing and deposit requirements.
Experienced HMO Landlords
If you already own and manage one or more HMOs successfully, lenders are more comfortable offering higher LTV ratios. Some specialist lenders will stretch to 80% LTV (20% deposit) for experienced HMO investors with a proven track record of rental management and property maintenance.
Experience typically means you have owned at least one buy-to-let property for 12 months or more. For the most favourable terms, having managed an HMO specifically — rather than just a single-let property — carries more weight.
First-Time HMO Investors
If this is your first HMO purchase, many lenders will want to see a larger deposit to offset the perceived risk. A 25% deposit is the minimum most lenders will consider for first-time HMO buyers, and some will require 30%.
That said, if you have experience as a landlord with standard buy-to-let properties, this counts in your favour even if you have not owned an HMO before. The key distinction lenders make is between someone who has managed tenants and someone who has not.
If you are completely new to property investment, see our first-time HMO landlord guide for a full breakdown of what lenders expect.
Portfolio Landlords
If you own four or more mortgaged buy-to-let properties, you are classified as a portfolio landlord under PRA rules. This triggers additional underwriting requirements — lenders must assess your entire portfolio, not just the property you are borrowing against.
Portfolio landlord status does not necessarily mean a higher deposit, but it does narrow the field of available lenders. Some lenders who offer competitive LTV ratios for non-portfolio borrowers become more conservative when portfolio rules apply. For guidance on navigating this, read our portfolio landlord HMO mortgage guide.
How Rental Income Affects Deposit Requirements
HMO mortgages are assessed primarily on rental income rather than personal earnings. The rental coverage ratio — also called the interest cover ratio (ICR) — is the lender's main measure of affordability.
Most lenders require the gross rental income to cover 125% to 145% of the mortgage payment at a stressed interest rate (typically 5.5% to 8%, depending on the lender and tax band).
Here is how this connects to your deposit: if the rental income comfortably exceeds the required ICR at a lower LTV, lenders may offer a more competitive rate. But if the numbers are tight — perhaps because the property is in a lower-yield area or has fewer rooms than the purchase price suggests — the lender may require a larger deposit to bring the ICR into line.
In practical terms, a property with strong HMO yields (8%+ gross) is more likely to qualify at 75% LTV than a property in a premium area yielding 5% gross, even if the borrower profile is identical.
To see how different deposit levels affect your monthly payments and ICR, use our HMO mortgage calculator.
Ways to Reduce Your Deposit
If raising a 25% or 30% cash deposit feels out of reach, there are legitimate strategies to reduce the cash outlay required.
Use Existing Equity as Security
If you own other property — whether your home or other buy-to-let investments — and have sufficient equity, you may be able to use that equity as security for your HMO purchase. This effectively allows you to borrow 100% of the HMO purchase price by securing part of the loan against your existing assets.
This approach requires careful structuring and is not available from all lenders, but it is a well-established technique in property investment. The key requirement is having enough unencumbered equity across your portfolio.
Remortgage to Release Deposit Funds
A more straightforward approach is to remortgage an existing property to release equity as cash, then use that cash as your HMO deposit. This is the most common way experienced investors fund new purchases without saving from income.
The advantage is simplicity — the HMO lender sees a genuine cash deposit. The disadvantage is that you are increasing borrowing on your existing property, which affects your overall portfolio leverage. For a full guide to this strategy, see our HMO remortgage guide.
Below Market Value Purchases
If you purchase a property below its market valuation, some lenders will calculate the LTV based on the valuation rather than the purchase price. This means your deposit — as a percentage of valuation — is effectively larger than the cash you put in.
For example, if you buy a property valued at £300,000 for £240,000 and the lender assesses LTV on valuation, your £60,000 deposit represents 20% of the valuation. You would only need to find enough cash to cover the difference between the purchase price and the loan amount.
Not all lenders work this way. Some use the lower of purchase price or valuation, which negates this advantage. Check the specific lender's approach before relying on this strategy.
Joint Ventures and Investor Partnerships
Pooling resources with a business partner or investor can make larger deposits achievable. This is particularly common when purchasing through an SPV (limited company), where multiple shareholders can contribute capital.
If you are considering this route, our guide on SPV vs personal name ownership covers the structural options and their implications.
Deposit Requirements by Ownership Structure
Whether you buy in your personal name or through a limited company affects both the deposit required and the mortgage products available.
Personal Name
Buying in your personal name generally gives you access to the widest range of lenders and the most competitive LTV ratios. Deposits of 20% to 25% are achievable for standard HMOs bought personally, with lower interest rates compared to limited company products.
Limited Company (SPV)
Buying through an SPV typically means slightly higher deposit requirements — often 25% as a minimum, with fewer lenders offering 80% LTV for company purchases. Interest rates tend to be 0.5% to 1% higher than personal name equivalents.
However, the tax advantages of limited company ownership — particularly full mortgage interest relief against corporation tax — can more than compensate for the higher borrowing costs, especially for higher-rate taxpayers. See our limited company HMO mortgage guide for a detailed comparison.
What Lenders Actually Look At
Beyond the headline deposit figure, lenders assess several other factors that can influence whether your application is accepted at the LTV you want:
- Property condition and compliance — the HMO must meet all licensing requirements, minimum room sizes, and fire safety standards. A property that fails on compliance will either be declined or require a higher deposit
- Location — some lenders have geographic restrictions or adjust LTV based on local market conditions
- Article 4 directions — properties in Article 4 areas (where planning permission is required to convert to HMO use) need to have the correct permissions in place, or lenders will not proceed regardless of deposit
- Valuation — the lender's surveyor will provide an independent valuation, and if this comes in below the purchase price, your effective LTV increases and you may need to find additional deposit funds
- Exit strategy — lenders want to know the property could be sold or refinanced if needed, which affects their risk appetite
Deposit Ranges at a Glance
| HMO Type | Typical Deposit | Typical LTV |
|---|---|---|
| Small HMO (3-4 beds), experienced landlord | 15-25% | 75-85% |
| Standard HMO (5-6 beds) | 20-25% | 75-80% |
| Large HMO (7+ beds) | 25-35% | 65-75% |
| Sui generis / 10+ beds | 30-40% | 60-70% |
| First-time HMO buyer | 25-30% | 70-75% |
| Limited company purchase | 25-30% | 70-75% |
These ranges are indicative. Individual lender criteria vary, and rates change regularly. For current product availability, compare options on our HMO mortgage rates page.
Frequently Asked Questions
Can I get an HMO mortgage with a 15% deposit?
It is possible, but only in limited circumstances. Some lenders will offer 85% LTV for smaller HMOs (three to four bedrooms) bought in personal name by experienced landlords with strong rental income. The product choice at this LTV is narrow and rates will be higher than at 75% LTV.
Is the deposit higher for a large HMO than a small one?
Yes. Large HMOs (seven or more bedrooms) almost always require a larger deposit — typically 25% to 35% compared to 20% to 25% for standard HMOs. The increase reflects the additional risk lenders associate with larger, more complex properties and the smaller resale market.
Can I use gifted deposits for an HMO mortgage?
Most buy-to-let and HMO lenders do not accept gifted deposits in the same way residential lenders do. The deposit is generally expected to come from your own savings, existing equity, or business funds. Some lenders may accept gifts from immediate family members, but this is less common in the HMO space.
What happens if the valuation comes in lower than expected?
If the surveyor values the property below your agreed purchase price, the lender will calculate LTV based on the lower valuation. This means you effectively need a larger deposit to maintain the same LTV. You can either renegotiate the purchase price, find additional funds, or in some cases, challenge the valuation with supporting evidence.
Do I need a bigger deposit if I am buying through a limited company?
Generally, yes. Limited company HMO purchases typically require a minimum 25% deposit, whereas personal name purchases can sometimes achieve 20% or lower. The trade-off is that limited company ownership offers full mortgage interest relief against find out more, which can offset the higher deposit and borrowing costs over time.
Next Steps
The deposit is just one piece of the HMO mortgage puzzle. Once you know how much you need, the next step is understanding how lenders calculate what you can borrow. Our HMO mortgage affordability guide walks through the income calculations, stress tests, and structuring tips that determine your maximum loan.
To model different deposit scenarios and see how they affect your monthly payments and borrowing power, use our HMO mortgage calculator.