If you are buying, selling, or underwriting a coastal property based on short-term rental income, Isle of Palms and Sullivan’s Island should not be treated the same. These two barrier-island markets sit close together, but their rules are very different. Understanding that difference can help you avoid bad assumptions, ask smarter questions, and make more confident decisions before you buy or list. Let’s dive in.
Isle of Palms vs. Sullivan’s Island
The clearest way to look at these two markets is this: Isle of Palms is a regulated short-term rental market, while Sullivan’s Island is a grandfathered-use market.
On Isle of Palms, the city’s public guidance focuses on licensing, occupancy limits, parking, taxes, and enforcement for residential short-term rentals. On Sullivan’s Island, the zoning code states that vacation rentals are prohibited uses except for legally established nonconforming properties that may continue only with the required annual approvals. You can review the current Isle of Palms guidance on the city’s short-term rental page and the Sullivan’s Island rules in the town’s zoning code.
For buyers and sellers, that distinction matters. On Isle of Palms, the main questions are usually about compliance and operating costs. On Sullivan’s Island, the first question is often whether the property has a continuing legal right to operate as a vacation rental at all.
Isle of Palms rental rules
Isle of Palms licensing basics
On Isle of Palms, owners of residential rental units must obtain a short-term rental business license. According to the city’s short-term rental requirements, the application process includes a Rental Revenue Affidavit, end-of-year revenue statements from property managers or booking sites, and a fire-safety acknowledgment for both new licenses and renewals.
License fees are tied to prior-year gross income. The city states the fee is $450 for the first $2,000 of gross income, plus $4.60 for each additional $1,000, and payment is due by April 30. The same city guidance also notes that unless the property qualifies as the owner’s primary legal residence, it may be assessed at 6% of fair market value for property-tax purposes.
Isle of Palms occupancy limits
Occupancy math is one of the most important details to verify before you rely on projected rental income. On Isle of Palms, maximum overnight occupancy is typically two people per bedroom, plus two people, up to a maximum of 12 overnight guests, excluding children under age two.
The city also limits total occupancy at any time to twice the overnight occupancy or 40 people, whichever is less. That means your projected use, guest count, and marketing language should align with the actual legal occupancy standard, not just with how a home is physically laid out.
Isle of Palms parking rules
Parking is another major compliance issue. The city states that the maximum number of vehicles allowed at a residence between 11:00 p.m. and 9:00 a.m. is the greater of one vehicle per bedroom or one vehicle for every 2.5 people allowed under the overnight occupancy limit, with a minimum of two vehicles.
If off-street parking is not adequate, owners may apply to the Police Department for up to four portable parking permits per calendar year. Each permit costs $15 and applies to parking in public rights-of-way within the Resident Parking District from 9:00 a.m. to 6:00 p.m., as described on the Isle of Palms rental page.
Isle of Palms operating requirements
Isle of Palms requires short-term rental units to be rented in their entirety. Owners may not market private rooms or shared rooms within single-family homes.
The city also requires a 24/7 telephone number and says the owner’s representative must be able to be on site within one hour. In addition, a written notice showing the maximum overnight occupancy must be posted inside the residence.
Isle of Palms taxes and enforcement
For rentals of 30 days or less, the city lists a combined 14% tax-and-fee burden, which includes state, county, and city taxes plus the beach-preservation fee. Even if an agent collects and remits those taxes, the owner remains ultimately responsible for proper payment.
Enforcement is not just theoretical. The city says it may revoke a license when a licensee has engaged in or allowed unlawful activity or nuisance behavior, and revocation may occur when there are five or more founded complaints of unlawful activity in a single calendar year. The city has also publicly discussed enforcement activity, including staff support and software used to identify unlicensed operators, as noted in the city’s short-term rental materials and a city council moratorium notice.
Sullivan’s Island rental rules
Sullivan’s Island starts with a ban
Sullivan’s Island works very differently. The zoning code says vacation rentals are prohibited uses. The only exception is for legally established nonconforming vacation rentals that qualify to continue under the town’s rules.
That makes Sullivan’s Island a much narrower and more property-specific analysis. If a home does not qualify under the nonconforming-use framework, a buyer should not assume short-term rental use is available simply because a property is in a coastal location or because past marketing materials suggested it.
Sullivan’s Island grandfathered status
To continue operating as a vacation rental, the owner of a principal building must show that it was lawfully used as a vacation rental during the 12 months before November 21, 2000. The owner must then obtain both a certificate of zoning compliance and a vacation rental business license for each calendar year and for each principal building used as a vacation rental.
The zoning code also says the certificate cannot be granted if, after ratification of the ordinance, the principal building was enlarged, razed, or otherwise destroyed. That is why pre-purchase due diligence on building history, prior use, and prior approvals is especially important on Sullivan’s Island.
Sullivan’s Island transfer and renewal rules
A Sullivan’s Island certificate and business license are not transferable. A new owner who wants to continue the use must apply within 30 days of the transfer or 30 days before the first vacation rental of the property.
Renewal requires more than a simple form. The town requires evidence that the prior-year vacation-rental license was issued, taxes were paid, water and sewer fees were paid in full, and the property was actually used as a vacation rental for more than two weeks in the previous calendar year. The owner must also consent to fire and building inspections and show no unlawful use or violations in the prior 12 months, according to the Sullivan’s Island zoning code.
Sullivan’s Island abandonment risk
One of the biggest underwriting issues on Sullivan’s Island is continuity of use. The code indicates that if there is 12 consecutive months of non-use, the vacation-rental right can be treated as abandoned.
In practical terms, that means a lapse in rental activity can do more than reduce revenue for a year. It may affect whether the use can continue at all. For buyers, this is one of the most important records to verify before placing value on rental potential.
Sullivan’s Island operating standards
Sullivan’s Island also imposes detailed operating rules. A 24/7 contact person must be available for complaints, and that contact person’s name and phone number must be registered with the Police Department.
Occupancy is controlled by bedroom-area calculations and total-person caps. The code limits occupancy to no more than two occupants per 120 square feet of bedroom area, plus one additional occupant for each additional 60 square feet in shared bedrooms, with an absolute limit of 12 occupants and 24 people total on the property at any time. The code also prohibits weddings, parties, or other social events with more than 24 people.
The owner or manager must keep tenant and vehicle registration records, provide off-street parking for all vehicles, watercraft, and trailers used by tenants, and use a written lease that includes the tenant’s agreement to the rules. All rentals must be for at least three continuous nights, and the property may not be converted to inn or motel use.
Sullivan’s Island fees and penalties
The town’s annual business license cycle runs from May 1 through April 30, and the business license page states that late payment after April 30 triggers a 5% monthly penalty.
Sullivan’s Island also imposes a 1% municipal accommodations fee on gross proceeds from accommodations, including short-term rentals, under the town ordinance. The zoning code further states that certificates and licenses may be suspended or revoked after two or more failures to satisfy required conditions, and violations may be prosecuted as misdemeanors with fines of up to $500 per day per violation and/or 30 days in jail.
What buyers should verify first
If you are buying with short-term rental income in mind, these are some of the most important questions to ask before moving forward:
- On Isle of Palms, does the property meet the occupancy formula, vehicle limit, and parking requirements?
- On Isle of Palms, what are the expected annual license fees, parking-permit costs, tax obligations, and likely property-tax assessment status?
- On Sullivan’s Island, is the property truly a legally established nonconforming vacation rental, or is the use being described in a way the code does not allow?
- On Sullivan’s Island, has the property been enlarged, razed, destroyed, or left unused long enough to risk abandonment of the use?
- On both islands, are there prior complaints, unpaid taxes, license issues, or operating problems that could affect future renewal or enforcement risk?
For luxury coastal buyers, details like these can materially change value, carrying costs, and the type of ownership experience you should expect.
What sellers should prepare
If you are selling a home where rental history is part of the value story, documentation matters. Buyers will want more than broad statements about income potential.
A stronger seller package may include licensing records, proof of tax compliance, operating history, occupancy and parking details, and any documents supporting a property’s legal status. On Sullivan’s Island in particular, clear records around grandfathered use, renewal history, and continuity of operation can be central to the buyer’s decision-making process.
When you are positioning a high-value coastal property, precise guidance and careful presentation can help you avoid overpromising while still highlighting legitimate value. That is especially important in markets where regulation is a meaningful part of the asset story.
If you are considering buying or selling on Isle of Palms or Sullivan’s Island and want a discreet, informed strategy around rental-use questions, connect with Oliver Caminos for a private consultation.
FAQs
What are the short-term rental rules on Isle of Palms?
- Isle of Palms requires a short-term rental business license and regulates occupancy, vehicle counts, parking, tax compliance, local contacts, and enforcement for rentals.
Are short-term rentals allowed on Sullivan’s Island?
- Sullivan’s Island generally prohibits vacation rentals, except for legally established nonconforming properties that qualify for ongoing annual approval.
Can a buyer start a new vacation rental on Sullivan’s Island?
- In general, the zoning code treats vacation rentals as prohibited uses, so a buyer should verify whether a property has a valid grandfathered status rather than assume a new use can begin.
How many guests are allowed in an Isle of Palms short-term rental?
- Isle of Palms typically allows two people per bedroom plus two, up to 12 overnight guests, excluding children under age two, with separate limits on total occupancy at any time.
What can end vacation-rental rights on Sullivan’s Island?
- Based on the zoning code, issues such as loss of grandfathered eligibility, certain changes to the building, failure to renew properly, or 12 consecutive months of non-use may affect the right to continue operating.
What should sellers disclose about rental use on these islands?
- Sellers should be prepared to provide accurate records related to licenses, taxes, complaints, occupancy rules, operating history, and any documentation supporting the property’s legal rental status.
