How to underwrite a short-term rental in twenty minutes

Most people spend either two minutes or two weeks on a property. Two minutes is a guess. Two weeks means you look at four properties a month and lose the good ones.

Twenty minutes, done in the same order every time, is enough to reject most listings confidently and shortlist the rest.

Minutes 1 to 3: can it legally operate?

Permit cap, owner-occupancy requirement, HOA restrictions, buffer rules. If any of these are disqualifying, stop. You have saved yourself seventeen minutes and possibly a great deal more.

This has to come first. Doing it last is the single most common sequencing error in this asset class.

Minutes 4 to 8: what do the neighbours earn?

Find the comparable rentals within a mile or two. Not the national average, not the city average. The actual houses of similar size that are actually renting right now.

You are looking for three numbers: typical nightly rate, typical occupancy, and typical annual revenue. Then ask the question that matters, which is where your candidate would sit among them. Above the middle, at it, or below.

Minutes 9 to 12: what is the gap, and what does it cost?

If your property would sit below the middle, work out why. Usually it is one or two specific things: no hot tub in a market where everything has one, three bedrooms where the good money is in five, a kitchen that photographs badly.

Put a number on closing that gap. That number is either your value-add case or your reason to walk.

Minutes 13 to 17: the actual return

Now, and only now, build the return. Revenue minus the real costs: management or your own time, cleaning, utilities, insurance at short-term rental rates rather than homeowner rates, lodging tax, maintenance, platform fees, and a vacancy allowance you actually believe.

Then the debt. Then cash-on-cash on the money you are actually putting in.

Minutes 18 to 20: the downside

Two questions. What does this property earn as a long-term rental if the short-term strategy becomes impossible? And what happens to the numbers if occupancy comes in ten points below your estimate?

If the answers are survivable, you have a real candidate. If a ten point occupancy miss makes the property unaffordable, you have found a deal that only works if you are right about everything, which is not a deal.

Why the order matters more than the tools

Every step above filters out properties before you spend effort on the expensive analysis. Legality is a phone call. Comps are a few minutes. Full modeling is the costly part, and by the time you get there you should be looking at a property that has already survived three cheaper tests.