HMO vs Single Let: Which Is the Better Investment?

An HMO can generate considerably more rent than a conventional single let, but that does not automatically make it the better investment.

Higher rental income must be weighed against licensing, utilities, increased maintenance, more frequent tenant changes and substantially greater management demands. A single let may produce a lower headline yield while offering simpler administration, fewer tenant interactions and more predictable running costs.

The right choice depends on the property, local demand, available capital and how actively the landlord wants to manage the investment.

This guide compares an HMO with a single let using a realistic five-bedroom South East London example.

Considering an HMO investment? Sturstons can assess the expected rental income, operating costs and management requirements before you commit.

The figures below are illustrative and do not constitute financial, mortgage, tax or investment advice. Costs and returns will vary by property and landlord.

What is the difference between an HMO and a single let?

A single let is normally rented to one household under one tenancy agreement. This could be an individual, couple or family occupying the entire property.

An HMO is generally occupied by at least three people forming more than one household who share facilities such as a kitchen, bathroom or toilet.

Typical examples include:

• A five-bedroom house let to five unrelated professionals
• A student house share
• Individual rooms let under separate tenancy agreements
• A joint tenancy granted to a group of unrelated sharers

An HMO occupied by five or more people forming two or more households will normally require mandatory licensing. Smaller HMOs may also require a licence where the council operates an additional licensing scheme. Check the government’s HMO guidance.

The distinction affects the property’s rent, financing, insurance, management and regulatory requirements.

HMO vs single-let rental income

The principal financial advantage of an HMO is that each bedroom can produce income.

A house that might achieve £2,400 per month when let to one family could potentially generate £4,500 to £5,000 per month when its five bedrooms are let separately.

However, the two rental figures are not directly comparable.

With a single let, the tenants will normally pay their own:

• Gas and electricity
• Water
• Council Tax
• Broadband
• Television licence
• General household costs

HMO rents are frequently advertised with bills included. The landlord may therefore pay utilities, Council Tax, broadband and communal cleaning from the total rent received.

HMOs also tend to have higher management, maintenance and compliance costs.

The correct comparison is the money remaining after operating expenses, not simply the advertised monthly rent.

A realistic five-bedroom South East London example

Consider a five-bedroom terraced house in South East London valued at approximately £550,000.

The property could be operated in one of two ways:

1. Let to a family or single household for £2,400 per month.
2. Operated as a compliant five-bedroom HMO, with each room achieving an average of £950 per month including bills.

The figures below assume the property is already suitable for its intended use. They exclude purchase costs, tax, major refurbishment and the initial cost of converting it into an HMO.

Estimated annual income and operating costs

	Single let	Five-bedroom HMO
Gross monthly rent	£2,400	£4,750
Gross annual rent	£28,800	£57,000
Allowance for voids and arrears	£1,150	£2,850
Management and letting	£3,450	£6,840
Utilities and broadband	Tenant pays	£7,800
Council Tax	Tenant pays	£2,200
Communal cleaning	Not applicable	£1,560
Maintenance allowance	£2,880	£5,400
Insurance	£450	£900
Licensing and additional compliance allowance	Not applicable	£1,200
Estimated income before finance and tax	£20,870	£28,250

In this example, the HMO produces £28,200 more gross rent each year but only approximately £7,400 more before mortgage costs and tax.

The HMO still performs better financially, but the difference is much smaller once its additional expenses are included.

The precise result could change considerably if:

• One or more rooms achieve a lower rent
• Energy use is unusually high
• Several tenants leave close together
• The property requires frequent repairs
• The HMO licence restricts the permitted occupancy
• A managing agent charges a different fee
• The family rent is higher than anticipated
• The landlord self-manages either property

Our guide to how much an HMO costs to run provides a more detailed breakdown of the expenses behind these figures.

Purchase and conversion costs

A suitable HMO may cost more to acquire than a comparable single let. Existing licensed HMOs are often marketed partly on their rental income, while unconverted properties can require substantial work before occupation.

Possible conversion costs include:

• Fire doors and door closers
• Fire-alarm installation
• Emergency lighting
• Additional bathrooms
• Kitchen alterations
• Electrical upgrades
• Heating and hot-water improvements
• Sound insulation
• Bedroom furniture
• Planning applications
• Building Control approval
• HMO licence fees
• Professional reports and floor plans

A relatively simple conversion may cost tens of thousands of pounds. A property requiring structural alterations, additional bathrooms or a rear extension could cost considerably more.

This initial expenditure must be included when calculating the true return.

For example, an HMO producing £7,400 more annual operating income than a single let may initially appear clearly superior. However, if the conversion costs £70,000, it could take several years to recover that additional capital, even before financing and tax are considered.

A single let will usually require a smaller initial refurbishment, although it must still meet all applicable safety, repair and energy-efficiency requirements.

HMO and single-let yields

Gross yield is calculated as: annual rent ÷ property value × 100.

Using the £550,000 example:

Single-let gross yield
£28,800 ÷ £550,000 × 100 = 5.24%

HMO gross yield
£57,000 ÷ £550,000 × 100 = 10.36%

The HMO’s gross yield is almost twice as high. However, gross yield ignores the substantial difference in running costs.

Using the estimated income after operating expenses:

Single-let operating yield
£20,870 ÷ £550,000 × 100 = 3.79%

HMO operating yield
£28,250 ÷ £550,000 × 100 = 5.14%

This is a more meaningful comparison, although it still excludes:

• Mortgage interest
• Income or Corporation Tax
• Purchase costs
• Initial refurbishment
• Major capital expenditure
• The value of the landlord’s time

An investor should calculate gross yield, operating yield and actual cash flow before making a decision.

Which has higher running costs?

An HMO will normally cost more to operate.

Utilities

Where bills are included, the HMO landlord carries the risk of increasing energy and water costs.

Five unrelated occupiers may have very different working hours, heating preferences and energy habits. Usage can be more difficult to control than in a property occupied by one family.

Fair-usage clauses may help discourage excessive consumption, but they must be reasonable, clearly drafted and applied fairly.

Council Tax

A single-let tenant will normally be responsible for Council Tax.

In a room-by-room HMO, the property owner will generally be liable. The council’s classification of the property can also affect the amount charged.

Maintenance

HMOs experience heavier use of:

• Kitchens
• Bathrooms
• Boilers
• Washing machines
• Doors and locks
• Furniture
• Hallways and stairs

The landlord may also receive several separate maintenance reports from different tenants.

Cleaning

Many professionally managed HMOs include regular cleaning of communal areas. This protects the condition of the property and helps identify maintenance concerns but creates another recurring expense.

Insurance

A standard family-let landlord policy may not cover an HMO. Specialist HMO landlord insurance can cost more because of the occupancy and room-by-room letting arrangements.

Licensing and safety systems

An HMO may require:

• An HMO licence
• Fire-alarm servicing
• Emergency-lighting tests
• Fire-door checks
• Additional inspections
• More extensive record keeping

These costs reduce the difference between the HMO’s headline rent and its true profit.

Which requires more management?

An HMO generally requires considerably more active management.

A single let may involve one household, one tenancy, one rent payment and one check-in. If the tenants remain for several years, the day-to-day administration can be relatively limited.

A five-bedroom HMO can involve:

• Five separate tenant relationships
• Several rent payments
• Individual references and Right to Rent checks
• Separate deposits and inventories
• More frequent viewings and check-ins
• Tenant disagreements
• Communal cleaning
• Bills and utility accounts
• Regular safety checks
• More maintenance reports
• Monitoring the permitted occupancy

One room may become vacant while the other tenants remain. The landlord must then advertise, conduct viewings and introduce a new occupier into an established household.

An HMO can therefore produce greater income but behave more like an operating business than a passive property investment.

Voids and tenant demand

HMOs and single lets experience voids differently.

Single-let voids

When the household leaves a single let, the landlord can lose 100% of the rental income until the property is relet.

However, a good family or professional household may remain for several years, reducing reletting costs and administration.

HMO voids

If one room in a five-bedroom HMO becomes vacant, the landlord may retain approximately 80% of the potential rent.

This creates a degree of income diversification. The investment is not entirely dependent on one household.

However, individual rooms may turn over more frequently. If rooms take several weeks to fill, recurring partial voids can significantly reduce the annual return.

Demand should be assessed at room level. A strong market for family houses does not necessarily guarantee strong demand for rooms at the required rent.

In South East London, successful HMOs are usually positioned close to:

• Reliable rail or DLR connections
• Major employment areas
• Hospitals
• Universities
• Town centres and local amenities

The room size, number of bathrooms and quality of shared space also affect demand.

Licensing and planning

This is one of the largest differences between the two strategies.

A conventional single let may require selective licensing if the property falls within a designated area. An HMO may require mandatory, additional or selective licensing depending on its occupancy and borough.

Mandatory HMO licensing generally applies where at least five people forming more than one household share facilities.

Councils can apply additional licensing to smaller HMOs. Lewisham, Greenwich and Southwark, for example, operate schemes that can capture properties occupied by three or four unrelated sharers.

Planning permission is separate from licensing.

A house used by three to six unrelated occupiers will generally fall within use class C4. An Article 4 Direction can remove the usual permitted-development right to change from a family home in class C3 to a small HMO.

Larger HMOs occupied by more than six people are normally treated as sui generis and usually require specific planning permission.

Before purchasing for HMO use, check:

• Existing and lawful planning use
• Article 4 restrictions
• Licensing requirements
• Permitted number of occupiers
• Minimum room sizes
• Kitchen and bathroom standards
• Fire-safety requirements
• Waste-storage requirements
• Mortgage and insurance conditions

Our HMO compliance checklist covers the licensing, safety and management requirements in more detail.

Finance and mortgages

HMO mortgages can be more specialised than conventional buy-to-let finance.

A lender may consider:

• The landlord’s previous experience
• Number of bedrooms and occupants
• Whether rooms are let individually
• HMO licensing
• Planning use
• Property valuation
• Expected rental income
• Minimum room sizes
• Management arrangements
• Property condition and construction

Some lenders will not finance large HMOs or properties requiring substantial conversion.

Interest rates, arrangement fees and required deposits can differ from those available for a standard single let. A valuation may also consider the property’s value as a conventional house rather than simply applying a multiple to its HMO income.

Investors should obtain advice from a broker who understands HMO lending before exchanging contracts.

Tax considerations

The broad tax rules for residential rental income apply to both HMOs and single lets, but the higher income and larger expense base of an HMO can make the calculations more substantial.

For individual landlords, relief for residential-property finance costs is generally restricted to a basic-rate tax reduction. A company is treated differently and may ordinarily deduct qualifying interest when calculating its taxable property-business profit. HMRC explains the residential finance-cost rules.

Allowable revenue expenses may include qualifying:

• Management fees
• Insurance
• Repairs
• Utilities paid by the landlord
• Council Tax during relevant periods
• Cleaning
• Accountancy
• Licensing fees

Capital improvements are treated differently from routine repairs.

Stamp Duty Land Tax, Capital Gains Tax, ownership structure and financing can materially affect the result. The most profitable arrangement before tax may not produce the best return after tax.

A property accountant should review the figures using the investor’s actual circumstances.

Capital growth and resale

Single lets often have a broader resale market because the property can appeal to:

• Owner-occupiers
• Families
• First-time buyers
• Conventional landlords

This can support saleability, particularly where the property remains in a family-friendly layout.

An HMO may appeal primarily to investors if it has been heavily adapted with multiple en-suites, reduced communal space or a layout that does not suit a family.

However, a well-located, lawfully operated HMO with reliable income and good records may attract investors seeking an established rental business.

Capital growth is never guaranteed. Investors should avoid assuming that the HMO’s higher rental income will automatically result in a proportionately higher resale value.

Risks of an HMO

The main HMO risks include:

• High initial conversion costs
• Licensing or planning refusal
• Greater regulatory exposure
• More tenant turnover
• Higher maintenance and utility costs
• Disputes between housemates
• More intensive management
• Specialist mortgage and insurance requirements
• Local oversupply of rooms
• Licence restrictions reducing the planned occupancy

An HMO purchased on the assumption of five rental rooms may perform very differently if one room cannot legally be used as sleeping accommodation.

Risks of a single let

A single let is simpler, but it is not risk-free.

Potential disadvantages include:

• Lower rental income
• Complete loss of rent during a void
• Dependence on one household
• Lower gross yield
• Major arrears affecting the whole investment
• The cost of regaining possession where a statutory ground applies
• Exposure to a single local rental market

Since 1 May 2026, assured residential tenancies generally operate as periodic tenancies and Section 21 has been abolished. Both HMO and single-let landlords must use an applicable statutory ground when seeking possession. Read the current Renters’ Rights Act information.

HMO vs single let: summary

Factor	HMO	Single let
Gross rental income	Usually higher	Usually lower
Running costs	Higher	Lower
Initial investment	Often higher	Usually lower
Management	Intensive	Simpler
Tenant turnover	Usually more frequent	Often lower
Income during one vacancy	Other rooms still produce rent	Entire rent may be lost
Licensing	Frequently required	May require selective licensing
Planning	C4 or sui generis issues	Usually straightforward C3 use
Mortgage choice	More specialised	Wider lender choice
Insurance	Specialist HMO cover	Standard landlord cover
Resale market	Can be investor-focused	Often broader
Potential operating yield	Higher where managed well	Lower but potentially steadier

Which is the better investment?

An HMO may be the better choice where:

• Room demand is strong
• The purchase price supports the expected rent
• Planning and licensing have been confirmed
• Conversion costs are proportionate
• The layout provides good bedrooms and shared space
• The landlord has sufficient reserves
• Professional management is included in the figures
• The return remains attractive after realistic expenses

A single let may be better where:

• The landlord wants simpler management
• Local family demand is strong
• The property would be expensive to convert
• HMO planning is restricted
• The landlord prefers longer tenancies
• Capital growth and broad resale appeal are priorities
• The HMO’s additional net income would not justify the workload and capital required

Neither strategy is automatically superior.

The strongest investment is normally the property that works under cautious assumptions, not the one showing the highest possible rent on a spreadsheet.

Frequently asked questions

Are HMOs more profitable than single lets?

HMOs commonly generate higher gross and net rental income, but they also have higher utilities, maintenance, management and compliance costs. Profitability depends on the purchase price, achievable room rents and actual operating expenses.

Do HMOs have a better return on investment?

They can, especially where room demand is strong and conversion costs are controlled. Return on investment should include the purchase deposit, Stamp Duty, refurbishment, furniture, licensing and professional fees, not only the property value.

Is an HMO harder to manage?

Yes, generally. An HMO involves more tenants, more frequent changes of occupation, communal areas, additional safety requirements and potentially several separate rent payments and deposits.

Is an HMO less risky because the rent comes from several tenants?

It can reduce the impact of one vacancy because the remaining rooms continue producing income. However, HMOs introduce other risks, including licensing, planning, higher operating costs and more frequent tenant turnover.

Is a single let a more passive investment?

A well-maintained single let occupied by a stable household will normally require less day-to-day administration than a room-by-room HMO. It still requires inspections, repairs, safety checks and proper tenancy management.

How many tenants make a property an HMO?

A property will generally be an HMO when at least three people forming more than one household live there and share facilities. Mandatory licensing normally begins at five occupiers, although local additional schemes can cover smaller HMOs.

Can I convert any house into an HMO?

No. Planning restrictions, licensing standards, room sizes, fire safety, amenities, mortgage conditions and lease restrictions may prevent or limit HMO use. These should be checked before purchase.

Should I buy an existing HMO or convert a single let?

An existing lawful HMO may reduce conversion and planning risk, but it requires careful due diligence. Check the licence, planning status, fire precautions, tenancy records, operating expenses and whether the existing rental income is sustainable.

Compare the real return before investing

The HMO in our example generates more income than the single let, but it also costs considerably more to operate.

Its advantage depends on maintaining strong room occupancy, controlling utilities and repairs, complying with licensing conditions and managing several tenant relationships effectively.

Before choosing either strategy, prepare a property-specific forecast containing:

• Realistic rent
• Voids and arrears
• Management
• Utilities and Council Tax
• Maintenance
• Insurance
• Licensing and compliance
• Mortgage payments
• Initial investment
• Tax
• A contingency allowance

Sturstons manages HMOs and residential properties across South East London. We can assess rental demand, expected room rates, management costs and the practical requirements of operating the property.

To discuss an existing or proposed investment, contact Sturstons on 0208 108 5974 or request a property-management appraisal.