The Mistake: Over-Relying on Online Rental Estimates Without Local Research
Automated rental estimate tools (Zoopla, Rightmove) are useful starting points but frequently overstate achievable rents, especially for HMOs and serviced accommodation. Always verify with local letting agents.
Portal rental estimates use algorithm-based data that can lag the live market by months, and they rarely differentiate between property condition, specific street quality, or the nuances of HMO vs single-let demand. An investor modelling a deal on these figures without on-the-ground verification is building a business plan on shaky data.
The correct approach is to contact 3–5 local letting agents, present the property details, and ask what rent they would confidently achieve and at what void rate. Ask specifically about demand for the target tenant profile. For an HMO, ask which room sizes are hardest to fill. For SA, check actual achieved rates on AirDNA for that specific postcode — not the listed price, the achieved price. This takes two hours and can be the difference between a positive and negative cash flow deal.