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How to analyse an HMO deal

A House in Multiple Occupation, or HMO, lets a property by the room to several unrelated tenants rather than to one household. The appeal is income: five rooms each at 500 pounds a month bring in far more than the same house let to a single family. The trap is that HMOs carry costs, rules and management overhead that a standard buy-to-let does not, and a lot of HMO "deals" only look good because those costs were left out.

Analysing one properly means modelling the room income, then subtracting everything that eats into it, and judging the return on the cash you actually deploy. Here is the method.

Step 1: work out the real room income

Start with how many lettable rooms the property has, or will have after works, not how many bedrooms the listing claims. Then estimate a realistic per-room rent for the area, including or excluding bills depending on how you intend to let it. Most HMOs are let bills-included, which raises the headline rent but adds a cost line you must model.

Your gross income is the sum of the let rooms, not the rooms that exist. Assume one room sits empty more often than a single-family let would, because HMO voids and turnover are higher.

Step 2: account for licensing and planning

This is where HMO analysis differs most from buy-to-let, and where deals quietly fall apart.

Mandatory licensing applies across England to any HMO with five or more occupants from two or more households. The licence runs for five years and typically costs somewhere between 600 and 2,000 pounds depending on the council, with London boroughs at the top end. Many councils also run additional or selective licensing that catches smaller HMOs, so check the specific local authority.

Then there is Article 4. In areas with an Article 4 Direction, the normal permitted right to convert a family home (use class C3) into a small HMO (use class C4) is removed, so you need full planning permission to create the HMO at all. Article 4 areas are common in university towns and many London boroughs. If a property sits in one and does not already have HMO use, you are buying a planning risk, not a ready HMO.

Step 3: model the extra running costs

An HMO is more expensive to run than a single let. Build in:

  • Bills, if let inclusive: gas, electricity, water, broadband, council tax.
  • Higher management, often 12 to 15 percent of rent rather than the 8 to 10 percent of a single let, because there are more tenants and more turnover.
  • Compliance and safety: fire doors, alarms, emergency lighting, a regular electrical inspection, and any works the licence conditions require.
  • Higher maintenance and void allowance, because more tenants means more wear and more frequent re-letting.

Step 4: judge it on yield on cost

For an HMO the number that matters is yield on cost: annual net income divided by total cash deployed, where total cash is the purchase, the conversion or refurbishment to HMO standard, licensing, furnishing and buying taxes. A strong HMO produces a materially higher yield on cost than a single buy-to-let, which is the reward for the extra work and risk. If it does not, the simpler strategy usually wins.

Worked example

A six-bedroom house is bought for 250,000 pounds and converted into a five-room HMO (one room becomes a second bathroom and communal space).

  • Rooms let: 5 at 550 pounds a month = 2,750 a month, 33,000 a year gross.
  • Less bills, management at 13 percent, maintenance, voids and compliance: say 11,000 a year.
  • Net income: about 22,000 a year.

Worked example: cash deployed and yield

Cash deployed: purchase 250,000, plus SDLT with the 5 percent additional-property surcharge (roughly 15,000), plus conversion and refurbishment of 40,000, plus licensing and furnishing of 6,000. Total around 311,000.

Yield on cost: 22,000 divided by 311,000, about 7 percent net. Whether that is good depends on your market, but the point is the figure only means anything once the bills, licence, compliance and the empty sixth room are all in it. Strip those out and the same deal would have looked like a 10 percent-plus yield that does not exist.

How PropDetect helps

PropDetect models the HMO room income from the listing and floor plan, estimates the conversion and refurbishment costs room by room, and runs the per-room cash flow including the higher management and compliance overhead, so the yield on cost you see reflects the real running costs rather than a gross headline. You edit any input, including the room count and per-room rent, and it re-runs.

How to analyse an HMO deal, step by step

A four-step method for valuing a UK HMO on the income it really produces, from per-room rent to yield on cost.

  1. 1

    Work out the real room income

    Count the lettable rooms the property has or will have after works, estimate a realistic per-room rent for the area, and base gross income on the let rooms while allowing for higher HMO voids and turnover.

  2. 2

    Account for licensing and planning

    Check mandatory, additional and selective HMO licensing with the council, and check whether the property sits in an Article 4 area that would require full planning permission to create the HMO.

  3. 3

    Model the extra running costs

    Build in bills if let inclusive, higher management at 12 to 15 percent, fire and electrical compliance, and a higher maintenance and void allowance than a single let.

  4. 4

    Judge it on yield on cost

    Divide annual net income by the total cash deployed, including purchase, conversion, licensing, furnishing and buying taxes, and compare it to a single buy-to-let.

Frequently asked questions

When does an HMO need a licence?

Mandatory licensing applies in England to any HMO with five or more occupants from two or more households. Many councils also licence smaller HMOs through additional or selective schemes, so always check the local authority.

How much does an HMO licence cost?

Typically 600 to 2,000 pounds for the five-year licence, varying by council, with London boroughs charging the most.

What is an Article 4 Direction?

It removes the automatic right to convert a family home into a small HMO, so you need full planning permission to create the HMO. It is common in university towns and many London boroughs, and it is a key thing to check before buying.

Why is yield on cost the right measure for an HMO?

Because an HMO ties up purchase, conversion, licensing and furnishing cash, and yield on cost compares the net income to all of it. Gross room income flatters HMOs by ignoring the bills, voids and management they carry.

How is an HMO different from a standard buy-to-let to analyse?

You model per-room income rather than a single rent, you add licensing and possible planning, and you use higher management, bills and maintenance assumptions. The income is higher but so are the costs and the rules.

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