Charleston Beach Islands STR Report: Folly vs. Isle of Palms vs. Kiawah

Thomas Garner
5 days ago
9 min read

Updated: 5 days ago

Investors and hosts choosing between Charleston's barrier islands face the same demand curve — regional Southeast drive-in plus CHS fly-in families and golfers — but wildly different regulatory risk and return profiles. Folly is capped at 800 with waitlist durability; Isle of Palms rejects its cap and runs a competitive open supply; Kiawah is gated luxury with zone-density rules and low occupancy, high-ADR resort math.

Sullivan's and Seabrook's context is included because searchers confuse the island set. Directional AirROI figures use trailing-twelve-month data (Jun 2025–May 2026).

Rules-First Comparison — The Variable That Changes Everything

Regulation determines whether revenue tables are actionable. This comparison leads with legal posture, not ADR — the single biggest mistake in Charleston Island underwriting.

*Table 1 — Charleston beach island regulatory comparison (2026 vintage).*

Island	STR posture	New investor entry	Supply signal
Folly Beach	800 ISTR cap, upheld Mar 2026	Waitlist / buy-with-license	Frozen investment licenses
Isle of Palms	No cap, business license	Open	+30.5% YoY supply (AirROI)
Kiawah	Town license + KICA; Zone 1 density cap	License + zone check	+23.9% YoY supply
Sullivan's	28-night minimum	Closed (grandfathered)	~20 listings
Seabrook	557+110 permit caps (2025 regime)	Permit-limited	+25.7% YoY supply

Folly's cap was upheld in COA-2026-UP-075 (March 2026) with city ordinance review ongoing — licensed hosts hold optionality value; unlicensed buyers face binary risk. IOP has no analogous cap debate after the November 2023 referendum rejection. Sullivan's $914 ADR on roughly 20 grandfathered listings is not an open nightly STR market.

Economics by Island — ADR, Occupancy, and Revenue

Folly Beach shows approximately 930 listings, 45.7% occupancy, $610 ADR, and $85,798 average annual revenue (+8.9% revenue / +18.9% supply). Summer peak runs in July at roughly $15,551 monthly; January trough at roughly $4,353. Airbtics medians run $86K–$109K — cite the range, not a single vendor figure. Folly ranks in the top 2% US revenue markets on licensed inventory.

Isle of Palms carries approximately 1,047 listings, 41.7% occupancy, $768 ADR, and $86,609 average revenue (+26.8% revenue / +30.5% supply). The July peak reaches roughly $17,126 at $941 ADR. Airbtics cites a $87K–$132K range. Large-format 3+ bedroom houses dominate, accounting for 67.5% of the inventory.

Kiawah Island runs approximately 649 listings, 33.2% occupancy, $651 ADR, and $54,140 average revenue (+32.9% revenue). May–July peaks with golf stretching the spring and fall shoulder. Eighty-four percent professionally managed — resort market norms set the quality bar. Seabrook context: approximately 411 listings, 34.4% occupancy, $457 ADR, $36,462 average revenue — quieter, lower RevPAR, permit-capped.

Product and Guest Segment — Match Marketing to Island

Folly sells surf cottages, dog-friendly culture, Center Street walkability, and Charleston day-trip basecamp positioning. Guest profile: surf families, pet travelers, value-beach couples who want authenticity over resort polish.

Isle of Palms offers oceanfront 4–5-bedroom houses, Wild Dunes resort adjacency, golf-cart culture, and multigenerational weeks. Guest profile: family reunions, golf groups, luxury beach weeks. Roughly 175 rental units under Destination by Hyatt at Wild Dunes set service and amenity expectations for the entire IOP market — independent Front Beach homeowners compete against resort polish, not just other independents.

Kiawah offers golf villas, gated security, club access, and nature programs. Guest profile: affluent golfers, luxury families, celebration trips with a 99-day average lead time. Marketing spend should follow feeder mix — Kiawah warrants golf-publication and club-adjacent positioning; Folly warrants pet-travel and surf-culture channels; IOP warrants family-reunion and multigenerational targeting.

Tax, Fee Stack, and Guest Spend Math

All three islands collect roughly a 14% Charleston County guest tax in the applicable portions. Folly adds +1% municipal and +1% beach preservation. Isle of Palms adds +1% beach preservation. Kiawah has no additional municipal preservation fee; gated POA costs are on the owner side.

Guests see all-in pricing on OTAs; hosts net after a 15.5% Airbnb host fee (or roughly 8% on Vrbo), plus cleaning, maintenance, and business license gross-receipts fees. Net yield math must subtract regulatory costs: Folly license scarcity premium in purchase price, Kiawah $500/$200 STR license fees, IOP $450+ business license. Beach renourishment is a rising-cost narrative on Folly and IOP that operators should factor into carry costs.

Seasonality Overlay — When Each Island Peaks

City Charleston peaks in spring (March–May) — island hosts should not blindly copy peninsula event calendars. Beach islands peak in summer (June–August), with July being the highest on Folly and IOP.

*Table 2 — Seasonal revenue tiers by island (AirROI monthly averages).*

Month tier	Folly	IOP	Kiawah
Peak revenue	July (~$15,551/mo)	July (~$17,126/mo)	May–July golf+beach
Trough	January (~$4,353)	January (~$4,784)	Winter softened; golf snowbirds help
Shoulder strength	Spring Charleston spillover	Spring/fall family + golf	April–May, Sep–Oct golf

Kiawah stretches shoulder season more than pure beach towns — golf-forward guests book April and October trips in January with 99-day lead times. Folly and IOP January troughs demand event-calendar and shoulder pricing discipline; trough-discounting July premium weeks destroys RevPAR on all three islands.

RevPAR, Break-Even Math, and Five-Year Investment Horizon

RevPAR proxy equals ADR times occupancy. Folly licensed ISTR at $610 ADR and 45.7% occupancy on roughly 365 available nights produces approximately 167 booked nights and $101,870 gross theoretical — AirROI reports $85,798 average, meaning median performers trail averages. Underwrite to median, not top-quartile Airbtics figures.

IOP oceanfront at $768 ADR and 41.7% occupancy produces approximately 152 booked nights and $116,736 gross theoretical versus $86,609 AirROI average. Kiawah villa at $651 ADR and 33.2% occupancy produces approximately 121 booked nights and $78,771 gross theoretical versus $54,140 average — luxury tail skews averages; golf-season concentration matters.

Five-year thinking by island: Folly licensed ISTR holds durable pricing power because supply cannot flood even if demand softens — underwrite license value in purchase price. IOP offers the highest gross revenue potential ($86K–$132K range) with the highest competitive risk (+30.5% supply) — five-year winners invest in amenity moats: pools, elevators, oceanfront, review velocity. Kiawah suits patient capital with lower occupancy but $651 ADR and 99-day lead time; 84% pro-managed means independents need pro-grade merchandising.

Sullivan's, Seabrook, and the Fourth-Tier Comparison

Sullivan's Island ($914 ADR, roughly 20 listings) operates under a 28-night minimum for all non-grandfathered inventory — not comparable to Folly, IOP, or Kiawah open markets. Grandfathered scarcity produces strong ADR on existing licenses but zero new-entrant opportunity.

Seabrook Island ($457 ADR, 34.4% occupancy, 557+110 permit caps) attracts guests who prioritize equestrian access and an uncrowded beach over golf prestige — a fourth product tier, not a Kiawah substitute. Lower RevPAR than Kiawah, but less club-access disappointment risk for guests who want quiet luxury without resort gate complexity.

Searchers often include Seabrook in the Folly/IOP/Kiawah comparison set — address it in investor conversations to prevent category confusion. Seabrook's May 2025 permit regime (557+110 caps, activity logs, April 30 renewals) continues maturing through 2026.

Vendor Revenue Ranges and Airbtics vs. AirROI Divergence

When lenders or partners ask "how much will it make?", cite ranges across vendors: Folly $86K–$109K, IOP $87K–$132K, Kiawah $54K average with luxury tail above $100K. Single-vendor quotes mislead — Airbtics medians exceed AirROI averages in skewed luxury tails.

Always pair revenue range with legal night ceiling: Folly license, IOP open supply, Kiawah minimum-stay patterns. Illegal inventory earns an F grade regardless of ADR — regulation times revenue times competition intensity determines the composite investor grade, not platform averages alone.

Risk-Adjusted Ranking and the Decision Framework

*Table 3 — Risk-adjusted investor grades by island (assumes legal operation).*

Island	Regulatory risk	Revenue ceiling	Competition intensity	Composite grade
Folly (licensed)	Low (cap upheld)	High ($85K+)	Medium	A (if licensed)
IOP	Low (no cap)	Highest ($86K–$132K)	High (+30% supply)	B+
Kiawah	Medium (zones/KICA)	Medium ($54K avg)	High (84% pro-managed)	B
Sullivan's	N/A nightly	Grandfathered only	N/A	F new entrants

Choose Folly if you hold or can acquire an ISTR license and want capped-supply pricing power with surf-town authenticity. Choose IOP if you want a legal whole-home investment scale and can compete on amenities, photos, and reviews in an uncapped market. Choose Kiawah if you operate luxury villas, can navigate the KICA gate and club rules, and target golf-high-ADR guests accepting lower occupancy.

Avoid Sullivan's for nightly STR unless grandfathered. Consider Seabrook for quiet luxury with explicit permit availability. All three primary islands draw Charlotte and Atlanta drive families for summer weeks; Kiawah adds Northeast and Atlanta golf fly-drive at higher ADR and lower occupancy.

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Frequently Asked Questions

Folly vs Isle of Palms for investment? Folly offers cap-protected scarcity if licensed — supply cannot flood even during demand softening, thanks to COA-2026-UP-075 upholding the 800 ISTR cap. IOP offers open entry with the highest revenue ceiling ($86K–$132K range), but +30.5% supply growth and heavier competition from Wild Dunes resort inventory and new oceanfront launches. Folly grades A for licensed holders; IOP grades B+ for operators who can invest in amenity moats.

Which island has the highest ADR? Sullivan's ($914) and IOP ($768) lead open markets on AirROI averages; Kiawah ($651) and Folly ($610) follow. Sullivan's ADR reflects grandfathered scarcity on roughly 20 listings under a 28-night minimum — not an actionable benchmark for new nightly STR entrants. IOP oceanfront July peaks reach $941 ADR on AirROI monthly data.

Can you still buy an STR on Folly Beach? Only via property with an existing ISTR license or waitlist position — licenses are largely non-transferable; re-verify current city policy before acquisition. Folly City Council's 2026 ordinance review ("Scrap the Cap") introduces political uncertainty, but the appeals court upheld the cap in March 2026. Price regulatory risk into acquisition cap rates accordingly.

Is Kiawah good for Airbnb? Yes for luxury whole-home villas with proper town STR business license and KICA compliance — expect lower occupancy (33.2%), higher ADR ($651), and 99-day average lead time resort math. Eighty-four percent pro-managed inventory means independents need pro-grade photography, club-access honesty, and golf-season calendar discipline. Zone 1 carries a 40% density cap; verify STR eligibility before marketing.

What about Seabrook vs Kiawah? Seabrook is quieter, equestrian-forward, and lower RevPAR ($457 ADR, 34.4% occupancy) under 557+110 permit caps. Kiawah is golf-resort prestige with Ocean Course heritage and gated security. Different guest, different marketing — Seabrook sells privacy and horseback beach access; Kiawah sells championship golf and club-adjacent luxury. Neither substitutes for the other in guest-facing copy.

When do beach islands peak? Summer June–August; Folly and IOP July highest on AirROI monthly revenue. City Charleston peaks spring (March–May) instead — island hosts should not copy peninsula Spoleto or Wine + Food calendars. Kiawah peaks May–July for combined golf and beach demand, with April–May and September–October golf shoulders extending the calendar beyond pure beach seasonality.

Did Folly Beach's 800-license cap survive legal challenge? Yes — the South Carolina Court of Appeals upheld the cap in COA-2026-UP-075 (March 2026), preserving scarcity pricing for existing ISTR licensees while the city reviews long-term policy options. Licensed hosts hold optionality value; unlicensed buyers face binary regulatory risk through the 2026 ordinance review cycle.

Which island is best for large-family beach houses? Isle of Palms and the Wild Dunes corridor for uncapped supply and multi-suite homes — 67.5% of IOP inventory is 3+ bedrooms. Kiawah and Seabrook serve gated, quiet-luxury compounds with club-access merchandising for affluent multigenerational groups. Folly suits smaller surf cottages and dog-friendly families rather than 5-bedroom reunion compounds.

About the Authors

Crest & Cove Creative is a Southeast-focused short-term rental marketing agency founded by Thomas Garner and Jacob Mishalanie. We build direct-booking brands, listing-optimization systems, and market-specific content strategies for independent STR operators across the Gulf Coast, Appalachian Mountains, Coastal Georgia, the Carolinas, Virginia, and the Southeast lake country.