Room-by-Room Letting Calculator
Work out the net income from letting a property by the room, after bills, management, voids and the mortgage, and what an empty room costs.
💼 Are you a real estate agent or broker? Send this calculator to your buyers on your own branded listing page — every enquiry comes straight to your WhatsApp. Create free agent page →Letting by the room produces substantially more gross rent than a single tenancy and substantially more cost. The landlord usually pays all the utilities, management fees are higher, wear is heavier, and every room voids independently rather than the whole property emptying at once.
The compensation is resilience: one empty room out of five costs a fifth of the rent, where one empty single-let costs all of it. Whether the extra income survives the extra cost is what this works out.
The calculation
Gross rent = rooms × rent per room. Collected rent applies the occupancy rate. From that, deduct the bills you pay, the management fee charged on rent collected, and the mortgage. An empty room costs its rent less the management fee you no longer pay on it.
Worked example
Five rooms at 550 is 2,750 a month at full occupancy. At 90% occupancy 2,475 is collected. Bills of 450, management at 12% of 297 and a 1,100 mortgage leave 628 a month, or about 126 per room. Each empty room costs 484 a month.
Compliance is where the costs hide
Multi-occupancy property is regulated far more heavily than a single tenancy in most jurisdictions — licensing, minimum room sizes, fire separation, alarm systems and amenity ratios. Those requirements can involve substantial capital work, and letting without the right permission carries serious penalties. Check what applies before buying.
Turn a calculation into an enquiry
Buyers who run these numbers are ready to talk. Give every listing its own page with your photo, phone and WhatsApp on it — leads land straight on your phone.
Create your free property pageFrequently asked questions
Is room-by-room letting more profitable?
Usually in gross terms and often in net terms, though by less than the headline suggests. Bills, higher management fees, heavier wear, more frequent voids and compliance costs consume much of the extra rent.
What occupancy should I assume?
Eighty-five to ninety-five percent for a well-located property with staggered tenancies. Assuming full occupancy is unrealistic because rooms turn over individually and each changeover takes time to fill.
Why do lenders treat these differently?
Because the security is harder to value and to sell, and the regulatory risk is higher. Expect a specialist product, a higher rate, a lower maximum loan-to-value and questions about your experience as a landlord.