Short-Term Rental Strategy
How Charleston's Short-Term Rental Rules Should Factor Into a Buyer's Decision
A buyer called me last spring with a spreadsheet already built. He'd found a cottage near Folly Road, penciled out $4,800 a month in projected Airbnb income based on comparable listings he'd pulled online, and was ready to write an offer that only made financial sense if every one of those nights actually booked. What he hadn't done was call the City of Charleston's zoning office. The property sat in a residential zone where non-owner-occupied short-term rentals aren't permitted at all. His entire underwriting model was built on income he was never going to be allowed to collect.
That story isn't rare, and it's the reason short-term rental rules deserve a place at the very top of your due diligence checklist rather than an afterthought you research after falling in love with a house. Short-term rental rules in Charleston-area jurisdictions change frequently and vary by municipality — verify the current ordinance in the specific jurisdiction before relying on this for a purchase decision. What follows is the framework for asking the right questions, not a substitute for confirming today's actual rules with the city, county, or town where the property sits.
There Is No Single "Charleston Rule"
This is the part that trips up buyers relocating from cities with one uniform ordinance. The City of Charleston, Mount Pleasant, Isle of Palms, Sullivan's Island, and Folly Beach each regulate short-term rentals independently, and their approaches don't line up. Some jurisdictions permit short-term rentals only when the owner occupies the home as a primary residence. Others cap the total number of rental licenses issued and maintain waitlists once that cap is reached. Some zoning districts prohibit short-term rental use entirely, regardless of ownership structure. A house two streets apart from another can fall under completely different rules simply because it sits on the other side of a zoning line. Buying with a rental strategy in mind means treating the specific parcel's zoning designation as a threshold question, not a detail you'll sort out after closing.
Before You Write the Offer
Confirm three things directly with the relevant municipality, in writing where possible: whether short-term rental use is currently permitted for the property's zoning classification, whether an existing rental license or permit is tied to the current owner personally or transfers with the deed, and whether the jurisdiction has an active or proposed cap on new licenses. That last point matters more than buyers realize — several coastal towns have moved toward capping licenses in recent years, which means a permit that lapses during a sale isn't guaranteed to be reissued to you even if the prior owner held one for years. Build your due diligence period around getting these answers, not around assuming they'll work out.
The Financing Wrinkle Nobody Mentions
Even if the zoning checks out, your lender may not count projected short-term rental income the way you're hoping. Conventional loans typically require a longer rental history and appraiser-supported market rents before underwriters will credit vacation-rental income toward your qualifying ratios, and even then usually at a steep discount to gross projections. DSCR loans, common with investor buyers, qualify off the property's cash flow rather than your personal income, but they price in the regulatory uncertainty with higher rates and larger down payment requirements than a standard second-home loan. If your purchase only works on paper because of assumed nightly rental income, stress-test the deal against long-term rental rates or straight owner-occupancy, too — because that's the income the bank is actually going to trust.
Don't Forget the HOA Layer
City or town zoning approval doesn't override a private HOA or condo regime's rental restrictions, and this is the layer buyers most often skip. Plenty of communities across Mount Pleasant, Daniel Island, and the barrier islands prohibit or heavily restrict short-term rentals in their governing documents, regardless of what the municipality allows. A property can be zoned favorably and still be off-limits for nightly rentals because of a minimum-lease-term clause buried in the covenants. Pull the HOA's rules and any recent amendments before you assume the municipal answer is the whole answer.
Underwrite the Regulation, Not Just the Rate
The smartest approach I walk investor clients through treats short-term rental income as upside, not baseline. Price the property against what it would cash flow as a standard long-term rental or as your own second home first. If the numbers only work with vacation-rental premiums layered on top, you're underwriting a regulatory bet, not a real estate purchase — and municipalities up and down this coast have shown a willingness to tighten these rules further as full-time housing supply tightens. That doesn't mean avoid short-term rental properties. It means buy the real estate on fundamentals you can verify today, and let any rental income above that be the bonus rather than the load-bearing assumption your whole purchase rests on.
Thinking about a short-term rental purchase? Let's verify the current rules for the exact property and jurisdiction before you write an offer built on an assumption.
Call or Text Chris Eller: 843-343-3359