HMO Room Rent Optimiser

HMO properties carry higher running costs than single-let properties: mandatory licensing fees, higher management rates, and greater maintenance demand. This calculator takes your HMO’s total annual costs and target yield, and shows you the minimum rent per room to break even and the rent needed to reach your target return.

How to use

1. Enter your property value and number of lettable rooms.
2. Enter each annual cost category. Use the guidance notes if you are estimating.
3. Set your void allowance and target yield, then submit.

Property value (£) *

Number of lettable rooms *Please select an option3 rooms4 rooms5 rooms6 rooms7 rooms8 rooms

Annual mortgage interest (£)Enter 0 if you own the property outright

Annual HMO licence fee — amortised (£)Divide the total licence fee by the licence period in years. Mandatory HMO licensing applies to properties with 5 or more occupants forming 2 or more households. Some councils operate additional licensing schemes. Check with your local authority.

Annual letting agent or management fee (£)HMO management fees typically range from 12 to 18 per cent of gross rent, compared to 8 to 12 per cent for standard BTL, due to higher turnover and tenant management. Enter the total annual amount.

Annual maintenance budget (£)HMOs have higher wear and tear. A starting point is £500 to £1,000 per room per year.

Annual insurance (£)Use HMO specialist landlord insurance — this differs from standard BTL cover.

Other annual costs (£)Council tax (if landlord-paid), utilities in common areas, cleaning, and any other annual costs.

Void allowance (%) *A default of 8 per cent assumes one room vacant for approximately one month per year. HMOs typically have lower overall voids than single-let properties because other rooms continue generating income.

Target gross yield (%) *Your desired gross return on the property value. A typical HMO gross yield target is 8 to 12 per cent.

Total annual costs (£)

£

Break-even rent per room per month (£)

£

Target rent per room per month (£)

£

Margin per room per month (target minus break-even, £)

£

Annual gross rent needed to break even (£)

£

Annual gross rent needed for target yield (£)

£

Implied gross yield at break-even (%)

%

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Understanding your results

The break-even rent per room is the monthly figure at which your rental income covers your costs, after allowing for voids. The target yield rent is higher — it represents what you need to charge to achieve the return you have specified. If the two figures are close together, your cost structure leaves little margin.

HMO licensing requirements

HMOs with 5 or more occupants forming 2 or more households require a mandatory HMO licence under the Housing Act 2004. Some local authorities operate additional licensing schemes covering smaller HMOs. Licence fees, conditions, and enforcement vary by council. Operating an unlicensed HMO is a criminal offence and can result in a fine of up to £20,000 or a Rent Repayment Order requiring you to repay up to 12 months’ rent to tenants.