HMO vs Buy-to-Let Yield Calculator
Compare HMO room-by-room yield against single-let on the same property. Models bills, licensing, higher voids, and agent fees so the gross-rent advantage becomes a real net-yield delta.
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A House in Multiple Occupation (HMO) lets the same property to several unrelated tenants in separate rooms, with shared kitchen and bathroom. HMOs typically gross 1.5–2× single-let rent on the same property, but bills, licensing, higher voids and management overhead eat into that lead. This calculator compares the two strategies on the same building so the headline gross-rent advantage is reduced to a real net-yield delta.
Examples
£280k house, 5-bed HMO @ £550/room vs single-let @ £1,500
Lower per-room rent flips the comparison
Frequently Asked Questions
When does HMO make sense?
What about Article 4 directions and HMO licensing?
Why are voids higher for HMOs?
Should I include the HMO mortgage rate premium?
References
- UK government — HMO licensing rules — https://www.gov.uk/house-in-multiple-occupation-licence
- NRLA — buy-to-let and HMO landlord guides — https://www.nrla.org.uk/
Quick Tips
Double check your inputs. Ensure units match (e.g., inches vs cm).
A House in Multiple Occupation (HMO) lets the same property to several unrelated tenants in separate rooms, with shared kitchen and bathroom. HMOs typically gross 1.5–2× single-let rent on the same property, but bills, licensing, higher voids and management overhead eat into that lead. This calculator compares the two strategies on the same building so the headline gross-rent advantage is reduced to a real net-yield delta.
How to Use This Calculator
Enter the property price and acquisition costs once — they apply to both strategies. Add HMO refurb cost only if you would convert (it raises the HMO denominator). Then fill the single-let column (one rent, one agent fee, light costs) and the HMO column (per-room rent, bills inclusive, higher voids, licensing). Compare net yield, annual cashflow and break-even per-room rent.
Understanding the Formula
Single-let net = (rent × 12 × (1 − voidW/52)) × (1 − agent%) − other costs. HMO net = (perRoom × 12 × rooms × (1 − voidW/52)) × (1 − agent%) − bills − maintenance − licensing − other. Yield = net / (price + acquisition + refurb). Break-even per-room rent = (single-let net + HMO fixed costs) / (12 × rooms × occupancy × (1 − agent%)).
Examples
£280k house, 5-bed HMO @ £550/room vs single-let @ £1,500
Single-let: £18,000 gross, ~£14,800 net → 5.0% on £295k. HMO: £33,000 gross, but ~£15,600 in bills/licensing/maint/agent → ~£17,400 net → 5.5% on £315k. HMO wins by ~£2,600/yr after the bills are paid for.
Lower per-room rent flips the comparison
Same property, drop per-room rent to £450/mo. HMO gross £27,000 − £14,000 ≈ £13,000 net. Single-let £14,800 net wins. The break-even per-room rent (the rent at which HMOs match single-lets) is the figure to stress-test against local market rates.
Frequently Asked Questions
When does HMO make sense?
When the per-room market rent × number of rooms substantially beats the single-let rent — typically 1.7×+ ratio. University cities, professional house-share markets, areas with high transient demand. If the ratio is below 1.5×, the HMO uplift rarely covers the operational overhead.
What about Article 4 directions and HMO licensing?
Many UK councils have Article 4 directions removing permitted-development rights to convert to HMO — you need planning permission. Mandatory HMO licensing applies to 5+ unrelated occupants in England; many councils have additional or selective schemes covering smaller HMOs. Check the council before buying.
Why are voids higher for HMOs?
Each room is its own micro-tenancy. With 5 rooms turning over every 12-18 months, a few weeks of empty time per room is normal. Plus refurb downtime between tenancies. Modelling 0 voids on an HMO is the most common amateur mistake.
Should I include the HMO mortgage rate premium?
Yield ignores debt by construction. Once the yield comparison favours one strategy, build a leveraged cash-flow side-by-side using the actual mortgage rates each lender will offer for that property type. The HMO premium is real but not always large enough to erase the yield advantage.
Assumptions & Limitations
- Mortgage interest is excluded — yield measures the property strategy. HMO mortgages usually carry a rate premium of 0.5–1.5%; layer that on as a separate cash-flow analysis.
- Bills are flat. In reality utility usage scales with occupancy and energy prices move; budget conservatively.
- Per-room voids are independent. Real HMOs see correlated voids (term breaks for student lets, summer churn). Use 4 weeks per room as a conservative starting point.
- Licensing is amortised. UK HMO licensing is typically 5 years; divide the renewal fee by 5 for the annual figure.
- No HMO mortgage rate or higher insurance premium — single-let is the baseline. Add ~10–20% to insurance and 0.5–1.5% to mortgage rate when modelling HMO finance separately.
References
- UK government — HMO licensing rules — https://www.gov.uk/house-in-multiple-occupation-licence
- NRLA — buy-to-let and HMO landlord guides — https://www.nrla.org.uk/