What is an HMO mortgage?
An HMO mortgage is a specialist buy-to-let mortgage for a house in multiple occupation — a property let to three or more tenants who form more than one household and share facilities such as a kitchen or bathroom. Because the rent comes from several rooms rather than a single tenancy, these properties generate higher yields, but lenders treat them as more complex and assess them differently from a standard buy-to-let. HMO mortgages are unregulated lending aimed at professional and portfolio landlords.
What counts as an HMO?
In England, a property is generally an HMO if at least three unrelated tenants share it and share a kitchen, bathroom, or toilet. It becomes a large, licensable HMO — requiring a mandatory licence from the local council — when five or more people from two or more households live there. Some councils also operate additional or selective licensing schemes that catch smaller HMOs, so it is essential to check local rules before you buy.
How do lenders assess an HMO mortgage?
Lenders look at the total achievable room rent rather than a single-let figure, then apply a rental stress test just as they would for any buy-to-let. HMOs often attract a higher ICR requirement — commonly 145% and sometimes higher — because voids and management are more involved. Our guide to the rental stress test and ICR explains how that calculation works. Lenders will also want to see:
- A valid HMO licence, or evidence one can be obtained
- Compliance with room-size and fire-safety standards
- The borrower's landlord experience
- Whether the property is let by the room or on a single AST
How is an HMO valued?
Valuation is one of the biggest quirks of HMO finance. Smaller HMOs — often up to around six rooms — are usually valued on a bricks-and-mortar basis, the same way an ordinary house is valued. Larger or purpose-built HMOs may be valued on a commercial, income basis that reflects the rent the property produces, which can result in a higher valuation. Which method a lender uses affects how much you can borrow, so it pays to match your deal to a lender whose valuation approach suits the property.
How much deposit do you need for an HMO?
HMO lenders typically want a deposit of 25% or more, so a maximum LTV of around 75%. Larger or more specialist HMOs, and those valued commercially, may require 30% or more. As with any buy-to-let, a bigger deposit improves the rate and helps the deal clear the stress test. See our guide to buy-to-let deposit requirements for the full picture.
What do HMO mortgages cost?
As a general guide for the 2026 UK market, expect HMO rates to sit a little above standard buy-to-let rates because of the added complexity:
- Interest rate: typically around 5-7% depending on LTV, size, and licensing
- Arrangement fee: often 1.5-2% of the loan
- Valuation: higher than a standard house, reflecting the extra work involved
The higher yield an HMO produces usually more than compensates for the slightly higher borrowing costs, which is why experienced landlords favour them.
Should you hold an HMO in an SPV?
Most professional HMO landlords hold their properties in a limited company, both for the tax efficiency and because many HMO lenders prefer or require a corporate structure. Our guide to SPV buy-to-let mortgages covers how to set that up. Because HMO lending is niche, matching the deal to the right lender matters more than with a plain single-let.
How do you arrange an HMO mortgage?
HMO finance sits with a relatively small pool of specialist lenders, each with its own room limits, valuation method, and experience requirements. Assesr packages your HMO deal — the room rents, the licence position, the structure, and your track record — into a lender-ready credit paper in around 60 seconds and matches it to buy-to-let finance lenders whose criteria genuinely fit. You pay nothing until the deal completes: just the 0.5% Assesr Fee on drawdown, a quarter of the typical broker fee.
Frequently asked questions
What is an HMO mortgage?
An HMO mortgage is a specialist buy-to-let mortgage for a house in multiple occupation — a property let to three or more tenants from more than one household who share facilities such as a kitchen or bathroom. Lenders assess these on the total room rent and often require the borrower to have some landlord experience.
How many bedrooms can an HMO have for a mortgage?
Standard HMO lenders often cover properties up to around six bedrooms, while larger HMOs of seven or more rooms move into specialist commercial territory with a narrower panel of lenders. Above five occupants from two or more households, the property usually needs mandatory HMO licensing from the local council.
Do I need experience to get an HMO mortgage?
Many HMO lenders prefer borrowers who already own at least one buy-to-let, and some require it, though a growing number will consider first-time HMO landlords for smaller properties. Strong rental figures, a valid licence, and a company structure all help a less experienced applicant.