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Changing Buy to Let to HMO Mortgage

Many landlords decide to convert their buy-to-let property to a House in Multiple Occupation. You will need to remortgage to an HMO product.

Changing buy-to-let to HMO Mortgage

Scott West explains how you can change a buy-to-let to an HMO mortgage.

Can I convert my buy-to-let mortgage to an HMO mortgage?

You can. An HMO sits with a different group of lenders to a standard buy-to-let, so the move usually means changing lender. If your current lender writes HMO business, a product switch with them may be possible; in most cases, though, you will remortgage in full to make the change.

Do I need permission from my lender to switch from a buy-to-let to an HMO mortgage?

Yes. Your lender must approve the conversion before any work begins, and the property needs to sit on an HMO product before you let it. A buy-to-let mortgage and an HMO mortgage are built for different purposes, and the two are not interchangeable.

Lenders treat HMOs as the higher-risk proposition. Tenancies are shorter, tenants' priorities differ, and the condition of the stock is often weaker — anyone who has seen a let to students will recognise the pattern.

Converting a single buy-to-let, particularly one that has housed a family, frequently calls for a good deal of refurbishment. Lenders are cautious here, and some do not offer HMO products at all.

What are the steps to remortgage from a buy-to-let to an HMO mortgage?

The mechanics are straightforward: it is a remortgage. You select a lender and a product suited to the property, with the choice shaped by the number of bedrooms.

More than eight rooms, or six with some lenders, puts the property in large HMO territory; below that, it is a small HMO. The distinction affects pricing. Some lenders treat anything above 10 rooms as commercial.

From your side, the experience differs little from any other remortgage with a new lender — a Decision in Principle, submission, valuation and legal work, in the order you would expect.

The one addition worth attending to early is the local council. Confirm whether the area requires a licence to operate an HMO before you commit to works and the cost that follows them.

Are there extra fees involved in converting from a buy-to-let to an HMO mortgage?

There can be additional costs. The lender's arrangement fee may sit higher than you have seen on a standard buy-to-let, and valuation fees tend to be higher because the report goes further — assessing the property's viability as an HMO, the likelihood of letting, the area and the type of tenant it attracts.

Where the council charges a licensing fee, factor that in too. The remaining mortgage and legal costs should be much the same. Any arrangement fee will most often be charged as a percentage, in line with most buy-to-let products today.

The legal position varies by area, and a licence is likely. Confirm it early, because where the area requires one you cannot let the property without it. A property able to house five or more tenants from different households will, in most cases, fall within the rules.

You will need to meet fire safety regulations, and room sizes matter. A room smaller than 6.51 square metres — the mandatory HMO licensing minimum for a single adult in England — cannot be used as sleeping accommodation, and lenders examine undersized rooms closely.

On the building side, an architect may be needed. Structural work can require building regulations sign-off, depending on the scope.

If the layout already lends itself to the use and the work amounts to little more than fitting locks and reorganising the kitchen, the cost will be modest. A full refurbishment is a different matter.

What types of properties are suitable for an HMO mortgage conversion? Does my property need to meet specific criteria for an HMO mortgage?

In principle, any property can serve as an HMO, provided you make it suitable. That means locks on the bedroom doors, a shared kitchen, shared bathrooms and access through a single main entrance.

You cannot have some rooms reached from the rear of the house and others from the front. As long as that single point of access works, the property can function as an HMO.

Room sizes carry weight, and very small rooms can be a sticking point for some lenders — anything close to the 6.51 square metre licensing minimum will draw scrutiny.

If you are reconfiguring rooms, keep the layout sensible. Lenders look to saleability in the event of a repossession, so avoid changes that could not be reversed without much difficulty.

Do I need a deposit to change from a buy-to-let to an HMO mortgage? How much deposit do I need?

If you are converting a buy-to-let you already own, there is no deposit to find. The equity is already in the property.

As a buy-to-let, it will almost certainly hold at least 25% equity. You should not need to add to the deal, and a 75% loan-to-value HMO product is often achievable, subject to the area and the loan size.

There will, of course, be legal costs, building costs and potentially other professional fees attached to the conversion.

Do I need an HMO licence to remortgage?

If the property qualifies and sits in an area where HMO licences are required, you will need one. Without it, a lender will not advance the mortgage.

An unlicensed HMO might exist in such an area as a pre-existing arrangement, but it would not stand for long — and you certainly could not obtain a mortgage against it without the licence.

Speak to your local council, confirm whether a licence applies, and if it does, apply as early as you can.

How do interest rates differ between buy-to-let and HMO mortgages?

Rates differ, and so does the choice of lender. Not every buy-to-let lender offers HMOs, though every HMO lender will also write buy-to-lets.

HMO rates sit slightly higher than a standard buy-to-let, reflecting the greater risk the lender takes on.

They are comparable to the rates on multi-unit freehold blocks — where, for example, a terraced house is split into an upstairs flat and a downstairs flat to create multiple units on one freehold. That is another route landlords often weigh up.

Will my mortgage repayments increase if I switch to an HMO mortgage?

That depends on your loan amount and the interest rate. Because HMO rates are higher, you will usually pay more — unless you reduce the balance during the remortgage, or the property has risen materially in value.

Against that, the HMO model tends to generate considerably more rental income, so the position is one of swings and roundabouts.

Can I stay with the same lender when converting to an HMO mortgage?

Some lenders write HMOs and some do not. Among those that do, some will allow you to remortgage back to them, while others will not. Where you took the original buy-to-let with a lender of that second kind, you could not remortgage back to them on an HMO basis and would need to move to a different lender.

Much therefore turns on who currently holds your loan. It can be done, but not every lender will accept it.

How long does it take to convert a buy-to-let to an HMO mortgage?

The remortgage typically runs eight to 12 weeks, much like a standard buy-to-let. From a client's point of view, the process is all but identical.

Provided your documents are ready at the outset, as with any buy-to-let, the timeframe should follow much the same path.

What happens if I convert my property to an HMO without telling my lender?

Converting without telling your lender breaches your mortgage terms, which can bring penalties or a demand for immediate repayment. The lender may recall the loan, or repossess if the balance cannot be settled quickly.

There is also the risk of being recorded for mortgage fraud, which would weigh heavily on your ability to raise mortgages and finance in future. It is not a step to take.

How a broker helps with an HMO conversion

A broker's role is to identify the right lender and product, work through the legal and valuation points that need covering, and package the case in full for the lender.

In short, we make sure the case is presented at its strongest and keep matters moving as smoothly as possible from start to finish.

Some lenders are broker-only and cannot be approached directly, which is a further point in favour of using one.

Your property may be repossessed if you do not keep up with your mortgage repayments.

Most buy-to-let mortgages are not regulated by the Financial Conduct Authority.

Buy-to-let mortgages · HMO mortgages · Portfolio mortgages · Limited company BTL · SPV mortgages · BTL rental cover (ICR) calculator

Full transcript — “Changing Buy To Let to HMO Mortgage ”

Recorded February 2025. A conversation with Scott West of Propertyze, transcribed in full. 12 minutes · approximately 2,277 words.

Read the transcript

Hello, and on this episode of the Mortgage and Protection podcast, we have Scott here from Properties to explain how changing a Biterlet to an HMO mortgage works. It's great to chat with you as always, Scott. How's it all going? Yes, very well, thank you. Yeah, not too bad. Good, good. I'm glad to hear that. Well, as you know, we've got a list of frequently googled questions here, so let's get straight into them. And of course, first of all, would like to know, can I convert my Biterlet mortgage to an HMO mortgage? Yes, you can. You'll need to remortgage to a lender that offers HMO products because the products are very different from a standard Biterlet. So if your current lender offers it, it might be possible to switch the product with them, but most likely you'll need to

remortgage fully to do so. Right, okay. There we go. So that explains that. And actually with that in mind, it leads us on to the next question. Do I need permission from my lender to switch from a Biterlet to an HMO mortgage? Absolutely. Your lender must approve the conversion before you start, before you do the works to convert it, and before you rent it, absolutely. You'll need to switch it over to a HMO product. The reason being is that they are very different products for very different purposes. HMOs are deemed to be more risky. You're going to have different types of tenants in there. The quality of the properties tends to be lower. Tenancies are shorter, and tenants – we've all seen student blocks and things before – they're not kept to a very high

standard by the tenants. So a lot of re-fab work is required versus properties like single Biterlets with families in them. So lenders are very cautious about HMOs, and certainly some lenders will offer those products. Right, okay. Which makes sense there and something to bear in mind. So let's move on then. People would like to know what are the steps to remortgage from a Biterlet to an HMO mortgage? So yes, what's the process here? It's relatively simple. It's simply a remortgage. We just pick a lender and a product that's suitable for your HMO, depending on how many bedrooms it is. If it's more than eight rooms, six rooms for some lenders, it'll be a large HMO. If it's less than that, it'll be a small HMO. That can affect the pricing with some lenders. Some will deem it

to be commercial if it's more than ten. But really for you, no real difference. It's a full remortgage with a new lender. So the same process is decision of principles, submission, valuations, beagles, all the normal steps you'd expect. The difference being is you'll need to check with the local council whether you'll need a license to be a HMO, to hold a HMO in that area. So just check with your local council first before you start doing works and planning down a road that might be costly. Okay. So thank you for breaking all of that down there then. Hopefully that's clear. And again, with that in mind, are there extra fees involved in converting from a buy to let to an HMO mortgage? What do we need to know here?

There can be additional costs. Sometimes the arrangement fee with a lender might be higher than some of the buy to let you've seen previously. Valuation fees are higher because the valuation report is slightly more in depth. It covers off sustainability as a HMO, rental likelihood, area tenant types of stuff. So the valuation will be slightly more expensive. If there's licensing fees for council, that's a fee to factor in. But the other mortgage costs will be the same. The legal costs should be the same and any arrangement fee to the lender. So it will be most likely be a percentage like most of the buy to let products you see these days. Okay. So that's good news there, but it's useful to know the fees costs,

isn't it, in advance there. So let's move on to this question. I'm not sure if you've got anything else to add here. So what are the legal requirements for converting a property to an HMO? Legal requirements vary by location. So typically you'll need a HMO license. It's likely you'll need a HMO license. So obviously check for that because you can't let it without one if your area requires it. If it has five more tenants from different households, it will most likely qualify. So check with your council. As a HMO, you'll need to meet fire safety regulations. Room sizes are important. If you've got a room less than 20 square meters, that can cause problems for some lenders and the general costs for building

costs. So you might need to get an architect team. If you're doing structural works, you might need to have building regulations and build a sign off for various things, depending on how much work you're doing. If your house is already kind of suitable for it and you're just going to slap locks on doors and turn to the kitchen around, probably very little work. If you've got to do a full refurb, it could be more expensive. Right. Okay. So it really does depend on the factors involved, the variables there, but again, points to bear in mind when it comes to that. So let's move on to the next two questions combined. So what type of properties are suitable for an HMO mortgage conversion? Does my property

need to meet specific criteria for an HMO mortgage? You've talked a little bit about this already, haven't you? Yeah. So technically speaking, any property is suitable for HMO as long as you make it suitable to be an HMO, which would be locks on doors, shared kitchen, shared bathrooms, access through a main front door, not access through different doors. So not having some rooms access from the back of the house, some from the front of the house, the house needs to be a single house, just with locks on doors and shared facilities. So as long as you're able to achieve that, it's suitable to be HMO. I would caveat that with room sizes are important. If you've got very small room sizes, that could be a problem for some lenders. So under 20

meters squared will be a problem. And if you're going to convert some of these rooms down, just try and make sure the layout is sensible because the lenders will be looking for saleability in the event of a repossession. So don't do it into the house that couldn't be undone relatively easily would be another tip, I think. Yes, an important point there to note actually. Thank you for that. Let's continue on. So let's look at these two questions combined. So do I need a deposit to change from a buy to let to an HMO mortgage? And if so, how much deposit do I need to do this? So if you're converting a buy to let to a HMO, presumably you're already owning the property, right? So you won't need a deposit,

you already have equity in the home. As a buy to let it's almost certainly going to have 25% equity at least anyway. No, you won't need to put any more money into the deal because we can probably get you a 75% loan to value HMO product, depending on the area and loan size. So no, you shouldn't need to put any more money into the deal other than obviously legal costs, building costs if there are any professional costs for that conversion. Okay, so that answers that there. That's clear. So let's move on. There's lots of questions, isn't there here, Scott? So I think you've answered this one already, actually. Do I need an HMO license to remortgage just to confirm there? If your property qualifies and is in an area that HMO

licenses are required, then you absolutely need one from mortgage lender to lend to you. Without that, they won't give you the mortgage. Could you technically have a HMO in an area without a license? Is it that it was that encumbered? Yes, you wouldn't get away for very long, I don't think, but you certainly couldn't mortgage without that license. Absolutely speak to your local council, check whether you do need one. If you need it, apply for it and get it as soon as possible. Okay, so again, another important point there to take away from the episode. Okay, so we're getting through these questions now. The next one here asks, how does the interest rate differ between Bitalette and HMO mortgages? Do

they differ? Yes, they do. The lender choices change as well. So not all Bitalette lenders offer HMOs, but all HMO lenders will offer Bitalettes so that you've got a tier of lenders, I suppose is one way of thinking of it. The rates for HMOs will be slightly higher than the standard Bitalette, just because there's a higher risk element for the lender. The rates are similar to multi-unit freehold blocks, which are if you convert maybe a terraced house into an upstairs flat and a downstairs flat instead of one home, becomes multiple units on a freehold. So that's another option that people tend to look at if HMOs and multi-units are kind of there, they're appetites. Rates for those tend to be very

similar, if not the same. Right, okay, brilliant. Well, thank you for explaining that then when it comes to the rates. Now people would like to know as well, will my mortgage repayments increase if I switch to an HMO mortgage? It depends on your loan amount and the interest rate. HMOs have higher rates. So unless you're paying down the mortgage in this free mortgage process, or unless the property has significantly increased in value, so your loan to value drops, then yes, you will most likely pay more per month than you're paying on a single Bitalette mortgage. However, you're likely to have much greater rental income from the HMO model. So swings around about. Right, okay, there we go. So we've got three or four

questions left for this episode. So moving on to this one. And again, we might have covered this or a similar question earlier on. Can I stay with the same lender when converting to an HMO mortgage? So some lenders offer HMOs, some don't. Those that do, some of them will let you remortgage back to themselves. Some don't like to be remortgage back to you. So you either stay with them on a product transfer, which wouldn't work if you have a Bitalette with them. You couldn't remortgage back to them with a HMO, so you'd have to go to a different lender. So depends who you're currently with, it can be done, but not all lenders will accept it. Okay, so there we go. Something to bear in mind again there. Now, we've talked a lot about the

process, haven't we, of doing this? But how long does it take to convert a Bitalette to an HMO mortgage then? Is there a time frame here? The remortgage process typically takes eight to 12 weeks, very similar to a Bitalette to be honest with you, because the process from a client's perspective is virtually identical. It is a decision of principle, a full mortgage application, valuations, offer and legal. Assuming you've got all your documents up front like you have to do for a Bitalette, it should follow a very similar time frame. Okay, so that's good news there. There we go. Now, what happens if I convert my property to an HMO without telling my lender? So converting your property without telling a

lender will most likely, almost certainly, breach your mortgage terms, which will lead to penalties, immediate demand for payment back of the mortgage, they will recall the mortgage, repossessing you can't do quickly. There's risks of being kind of blacklisted for mortgage fraud. If your intention was that they could kind of think your intention was always to get a Bitalette from 30 to an HMO, it's mortgage fraud, significantly impact your ability to get mortgages and finance in the future. So don't do it. There we go. You're being told. Yes, let's swiftly move on then. So I mean, just lastly, you've demonstrated this already, Scott, but how can a broker help here? Is there anything else you'd like to add?

mortgage brokers, as we usually say, you know, can help you with finding the right lender for right products, navigating any legal or valuation points that need to be covered off, packaging the case fully for a lender, basically making sure your case is presented in the best light and it's as smooth as we can make it from start to finish. And some of the lenders are broker only. So you won't go to go directly. So brokers obviously have that benefit too. Right. Okay, there we go. Well, that's brilliant. Thank you for that, Scott. That's been really thorough there. So hopefully, that's proved useful to anyone listening to this. And I'm sure we'll catch you on another episode scene. Excellent. Thank you very much.

Please note your property may be repossessed if you do not keep up with your mortgage repayments. The Financial Conduct Authority does not regulate most buy to let mortgages.

This is a transcript of a spoken conversation recorded in February 2025, published as recorded and lightly corrected for names and technical terms only. It is general information about how this type of lending works, not advice on your circumstances. Any rates, fees, loan-to-values or criteria mentioned reflect the market as it stood when this was recorded and are not current pricing and not an offer of finance — for today’s figures, speak to an adviser.

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