Bricks and mortar vs investment valuation for HMOs

When a surveyor inspects an HMO, they choose a valuation basis before they settle on a number, and the two main approaches produce very different results.

Bricks and mortar, sometimes called the comparable method, values the property as if it were a normal residential house. The valuer looks at what similar houses on the same street or in the same area have sold for, then adjusts for size, condition and layout. The fact that it is currently run as a shared house with several tenants is largely set aside. In effect, the property is valued as a house someone might buy to live in or let to a single family.

Investment, sometimes called the commercial or income method, values the property on the rent it generates. The valuer takes the net operating income the HMO produces and applies a yield, or capitalisation rate, to arrive at a capital value. Here the property is treated as an income-producing asset, much like a small commercial investment, so the strength and reliability of the rent roll drives the number rather than what the house next door sold for.

The same building can therefore carry two quite different values depending on which lens is used, and knowing which one a lender will apply is the starting point for any HMO finance conversation.

The two methods are built on different inputs, so it helps to see what actually drives each number.

On the bricks and mortar basis, the valuer starts from comparable sales of similar houses in the local area. They weigh floor area, number of bedrooms in the original house layout, condition, and the general state of the local sales market. Money spent turning the house into an HMO, such as extra bathrooms, fire doors and a commercial kitchen, often adds far less to a comparable value than it cost, because a family buyer does not pay a premium for those works.

• Comparable sales: recent prices of similar nearby houses, adjusted for differences.
• Physical factors: floor area, room count, condition and location.
• Limited credit for HMO works: conversion spend rarely translates pound for pound into value.

On the investment basis, the valuer builds the figure from the income instead.

• Gross rent: the total achievable rent from all rooms, allowing for realistic void periods.
• Running costs: bills, management, maintenance, insurance and licensing deducted to reach net income.
• Yield applied: the net income is divided by a market yield to give a capital value, so a lower yield produces a higher value.

Because the two methods use different inputs, a strong, well let HMO can look ordinary on bricks and mortar yet valuable on an investment basis. The gap between the two is where much of the borrowing decision is won or lost.

Valuers do not apply the investment method to every HMO. It tends to appear when the property behaves less like a house and more like a business, and several features push a case in that direction.

• Size: larger HMOs, particularly those with more bedrooms, are hard to compare to ordinary family homes, so an income approach fits better.
• Licensing: a mandatory or additional HMO licence signals an established, regulated letting operation with a documented setup.
• Sui generis or large HMO status: where planning treats the property as a large HMO rather than a dwelling house, the comparable pool of normal houses shrinks and income valuation becomes more natural.
• Purpose built or heavily adapted layouts: properties designed or converted specifically for room by room letting rarely have close residential comparables.

For these properties the investment value can sit above the bricks and mortar value, because a well run, fully let HMO produces more income than the same house would as a single let, and that income supports a higher capital figure. This uplift is often called the commercial or investment value, and it is a large part of why experienced landlords build and hold sizeable HMOs. It is not guaranteed, though. The uplift depends on strong occupancy, clean licensing and a location where the income genuinely justifies the value, so it needs to be evidenced rather than assumed.

The valuation basis matters because lenders lend against the valuation figure, not against what you paid or what you spent. If the valuer picks a lower basis, your loan shrinks with it.

On a purchase, the lender advances a percentage of the value, with HMO loan to value typically running up to around 70% to 75%, indicative and subject to status and valuation. If the property is valued on bricks and mortar rather than investment, that percentage is applied to a smaller number, so your maximum loan is lower and you fund more from your own deposit.

Refinancing is where the basis really bites. Landlords often buy a tired house, convert it into a quality HMO, and then refinance to release capital. If the exit valuation comes back on an investment basis reflecting the new income, the property may be worth well above the purchase price plus works, and a refinance can return much of the invested capital. If instead it comes back on bricks and mortar, the value may barely move above the bare house price, leaving cash stuck in the deal. The rate you refinance onto sits in indicative bands too, with HMO mortgages broadly 5.5% to 6.5%, again subject to status and valuation. Understanding which basis a lender is likely to use, before you commit, is often the difference between a deal that recycles your capital and one that traps it.

A downvaluation is when the surveyor returns a figure below the price you agreed or the value you expected, and on HMOs it is a common cause of deals falling short. It usually happens for one of a few reasons: the valuer defaults to bricks and mortar when you assumed an investment basis, the comparable evidence is weak, the rent roll looks optimistic, or the licensing and paperwork do not stack up.

You cannot control a valuer's judgement, but you can give them every reason to support the figure. A few practical steps make a real difference.

• Evidence the income: provide a clear, current schedule of rents per room, tenancy agreements and a realistic void assumption.
• Keep licensing clean: have the HMO licence, gas and electrical certificates and fire safety paperwork ready, since gaps here undermine an investment valuation.
• Gather comparables: where possible, supply evidence of similar HMO investment sales, not just family house sales, to support an income approach.
• Match the lender to the property: some lenders lean towards bricks and mortar as standard, so choosing a funder whose criteria suit an investment valuation matters from the outset.

This is exactly where a broker earns their place. We help position a case with the right lender and the right supporting evidence so the valuation basis reflects how the property actually performs. We cannot promise a particular figure, since the valuation is always the surveyor's independent call, but a well prepared case gives it the best chance of landing where it should. Regulated cases, such as borrowing linked to a home you live in, are referred to an authorised firm.

The sensible way to look at an HMO is to hold both valuations in mind from the start. The bricks and mortar figure is your floor, the value the property holds simply as a house if the investment story does not carry. The investment figure is your upside, the value the income can unlock when the property is large, licensed and well let. Good HMO investing is largely about closing the gap between the two, then borrowing against the higher one when the evidence supports it.

In practice that means being honest about which basis a given property is likely to attract before you buy. A small, three or four bed HMO on a street full of family homes will probably be valued on bricks and mortar, so your plan should not rely on an investment uplift that may never appear. A larger, purpose adapted, fully licensed HMO in the right location has a genuine shot at an investment valuation, and structuring the purchase, works and refinance around that can transform the returns.

Because the basis drives your loan on purchase and the capital you can pull out on refinance, it deserves attention early, not as an afterthought when the survey lands. We are happy to talk through how a specific property is likely to be valued and which lenders fit, so you go in with a realistic view. These figures are indicative bands only, subject to status and valuation, and nothing here is financial, legal, planning or tax advice.