Condo and Townhome Airbnbs: The Square-Footage Minimum and HOA Rules That Decide Financing

A 480-square-foot studio condo in a beach building books well on Airbnb and cash-flows on paper. It still doesn’t close as a short-term rental DSCR loan, because the unit falls under a size floor most investors never hear about until the file is already in underwriting. Property type and square footage decide eligibility here before DSCR, credit, or rate ever come into the conversation — and condos, townhomes, and HOA-governed single-family units each clear that bar differently.

None of this is about the deal’s cash flow. It’s about whether the collateral itself is financeable at all, and that gets checked earlier than most investors expect.

The size floor: 500 square feet for a condo, 750 for everything else

A condo unit qualifies for short-term rental DSCR financing at a minimum of 500 square feet. A townhome, detached single-family home, or any non-condo property used as a short-term rental needs at least 750 square feet. That gap isn’t a typo — it reflects how each property type gets valued. Condo comparables are pulled from other condo sales in the same building or a near-identical one nearby, so a 500-square-foot one-bedroom in a coastal high-rise has real comparables and a real resale market even at that size. A 750-square-foot threshold on a townhome or single-family home exists because those property types are compared against the broader single-family stock in the area, where a unit smaller than that reads as functionally obsolete to an appraiser and to the next buyer.

A 620-square-foot condo clears the line with room to spare. A 620-square-foot townhome doesn’t — it’s 130 square feet under its own floor, even though it’s larger than the condo next door that qualifies without issue. Check the recorded square footage against the deed or the county assessor’s record before you go under contract, not the listing’s marketing copy, which rounds up more often than it rounds down.

Florida condos: five points of leverage, gone before underwriting starts

Florida condos carry a loan-to-value ceiling five percentage points lower than the same condo would get anywhere else the program is offered. That haircut sits on top of the size minimum, not instead of it — a Florida condo has to clear 500 square feet and still take the reduced LTV.

Run the arithmetic on a $300,000 condo purchase. Outside Florida, at a standard 75% LTV, the loan amount is $225,000 and the buyer brings $75,000 to closing. The identical condo in Florida prices at 70% LTV instead — a $210,000 loan, and $90,000 in cash to close. That’s $15,000 more on the same purchase price, the same credit profile, the same DSCR, for no reason other than the state the building sits in.

That five-point reduction traces back to Florida’s post-Surfside condo structural reviews and the resulting spike in HOA special assessments and master-policy insurance premiums across the state’s condo stock — costs that land on the DSCR math as higher HOA dues and insurance line items, and that lenders price for separately with the LTV reduction. It’s specific to Florida condos; it doesn’t apply to a Florida townhome, and it doesn’t apply to a condo in any other served state.

The HOA rental-restriction check happens before the underwriter looks at your file

Before DSCR, before the appraisal, before credit gets pulled in earnest, someone has to confirm the HOA or condo association actually allows short-term rentals — and allows them at the stay length you’re planning to book. A building that permits 30-day minimum rentals but caps anything shorter is not a short-term rental property no matter what the listing history shows; it’s a mid-term rental, and it needs to be underwritten and priced as one.

Pull three documents before you make an offer, not after: the recorded declaration or bylaws’ rental section, any rental cap (some associations limit the number of units that can be leased short-term at any one time, which can block you even when the rule itself allows STR), and whether a rental permit or association approval process exists separately from the city or county’s own short-term rental registration. A building can be legal for short-term rentals at the municipal level and still prohibit them at the HOA level, and the HOA document is the one that decides whether the loan can close.

When this is the wrong call

Skip a condo or townhome purchase for short-term rental financing when the unit is under its size floor and there’s no realistic path to combining it with an adjacent unit or documenting a larger livable area than the deed shows — a size shortfall doesn’t get waived for a strong DSCR number. Skip a Florida condo building specifically when the five-point LTV reduction pushes the required down payment past what the deal can support; a non-condo property or a different state often pencils better for the same capital. And skip any building where the HOA’s short-term rental language is ambiguous or silent rather than clearly permissive — get it in writing from the association before you’re under contract, not after you’ve ordered the appraisal.

Every figure above is indicative and subject to underwriting on the actual file; none of it is a committed rate, LTV, or approval. If you’re sizing a specific condo or townhome deal, the short-term rental deal check will flag the size and HOA questions early. Program details, including current LTV tiers, are on the short-term rental loan program page; for the 85% leverage tier specifically and who qualifies for it, see 85% LTV on a short-term rental. If the size minimum is clear but the building itself has warrantability issues — litigation, a high investor-owner concentration, or a failed structural reserve study — that’s a separate problem covered in non-warrantable condos under DSCR.