I'On

I'On is a 243-acre New Urbanist neighborhood in Mount Pleasant, master-planned by Duany Plater-Zyberk (DPZ) and Dover, Kohl & Partners for Vince and Tom Graham's I'On Company. The master plan came out of a 1995 design charrette; Mount Pleasant's March 1997 Planned Unit Development rezoning set a 762-home cap, and the first residents moved in during early 1999.

The HOA is a three-entity structure (Assembly, Trust, Club) with ~$1,650 base Assembly dues — separate from the optional I'On Club. Resale carries a split 0.25% transfer fee: 0.15% from the buyer to the Assembly, 0.10% from the seller to the I'On Trust. Flood exposure is edge-dependent — most of the neighborhood is Zone X, but the north and northwest marsh edge carries AE with base flood elevations of 9–10 ft. Rentals under 28 days are barred by covenant.

• Location: Mount Pleasant, SC — between Mathis Ferry Road and Hobcaw Creek
• Total homes: ~761 titleholding lots on ~243 acres (PUD cap 762)
• Price range: $1.4M - $5M+ (March 2026 median sale ~$2.3M; trailing-12-month median ~$2.0M)
• Home styles: Charleston Single, Lowcountry vernacular, New Urbanist
• Vibe: Walkable New Urbanist village, design-controlled, civic-programmed
• Year founded: 1995 master plan; March 1997 PUD (6–3 Town Council vote); 1999 first occupancy
• Base HOA fee: ~$1,650/year (Assembly base dues; I'On Club is separate and optional)
• Transfer fees: 0.15% buyer to Assembly + 0.10% seller to I'On Trust = 0.25% total
• Minimum rental term: 28 consecutive days (Rule D-110)
• Flood zone: Predominantly Zone X; AE pockets with base flood elevations of 9–10 ft along the north/northwest marsh edge
• Tax District: 21 — Town of Mount Pleasant; 260.4 mills combined in 2025 (44.3 town + 216.1 countywide)
• Lot sizes: 0.06–0.21 acres, median ~0.15 acre (~6,500 sqft)
• Schools: Charleston County School District — East Cooper zone; East Cooper Montessori charter (lottery) is on site
• Walk / Bike / Transit: 50 / 40 / 0 — walkable and bikeable, no fixed-route transit

I'On is Mount Pleasant's most thoroughly realized New Urbanist neighborhood — a place where the street plan, architecture, and community programming were designed together rather than bolted on. The 1995 charrette that produced the master plan was led by Duany Plater-Zyberk (DPZ) in collaboration with Dover, Kohl & Partners, for Vince and Tom Graham's I'On Company. Project size is 243 acres.

The neighborhood won the Congress for the New Urbanism 2003 Charter Award of Excellence. The CNU jury recognized the architectural quality as extraordinary for the scale of the project, and specifically credited the urban design code, the in-house architect, the design committee, a vernacular companion booklet, and a preferred-builder guild as the mechanisms holding quality over time. I'On was also recognized with the 2001 National Association of Home Builders (NAHB) Platinum Award for Best Smart Growth Community.

The physical plan organizes daily life around a two-minute walk. Six boroughs — Eastlake, Ponsbury, Shelmore, Westlake, Montrose, and Ionsborough — are each built around a lake, park, or waterfront feature. Streets use "deflections" (engineered bends and plantings) to hold speeds near 20 MPH. Zero-lot-line layouts and compact lots (0.06–0.21 acres, median ~0.15 acre) pull houses close to the street so porches function as shared civic space.

I'On is not a legally designated historic district. It is governed as a planned-development (PD) design code under Mount Pleasant's 1997 PD ordinance, with historic vernacular aspirations. Mount Pleasant's officially designated historic districts are the Mount Pleasant Historic District and the Old Village Historic District — both separate from I'On.

Homes in I'On trade between roughly $1.4M and $5M+, with most sales landing between $1.7M and $3M. The March 2026 median sale price was ~$2.3M with a 96.7% sale-to-list ratio and a 126-day median days on market. Trailing-12-month median closed price runs near $2.0M on ~41 sales, with price-per-square-foot roughly $751–$842. Inventory typically runs 11–23 active listings.

• Total titleholding lots: ~761 as of late 2025. The 1997 PUD set a cap of 762; roster counts and parcel counts differ because "home" can mean detached house, assessable HOA lot, or condominium unit — since 2000, "Lot" under the Declaration has included condominium units, with specified commercial and recreational lots withdrawn from HOA coverage.
• Median year built: 2004; most homes date from 1999–2012 construction.
• Average single-family size: ~3,000 sqft.
• Lot sizes: 0.06–0.21 acres, median ~0.15 acre (~6,500 sqft).

Homes are Charleston Single-inspired — triple-decker piazzas, double brick chimneys, copper-roof accents, colonnaded porches, handcrafted ironwork, ornate cupolas, and handcrafted fences. Minimum porch depth is 8 feet. Under the 2024 I'On Design Committee (IDC) Guidelines, the committee protects visual integrity, may assess fines for violations, and routes appeals to the I'On Board of Appeals. The guidelines are under active revision, with interim inspections and expanded in-person design conversations.

Daily life in I'On runs on a walkable village rhythm. The commercial core along Civitas Street and North Shelmore Boulevard sits within a two-minute walk of most homes, and the street plan — sharp bends, strategic tree placement, zero-lot-line layouts, shared greens — pulls porches, parks, and the amphitheater into the everyday rather than treating them as destinations apart.

• O'Brion's Pub — 361 N Shelmore Blvd (neighborhood pub)
• The Shellmore — 357 N Shelmore Blvd, Suite A (wine bar and seafood)
• The Square Onion — 18 Resolute Lane (deli and gourmet sandwiches)
• Community Table — 148 Civitas St (modern comfort food; shares building with The Inn at I'On)
• The Inn at I'On — 148 Civitas St (boutique B&B)
• Grace Salon Spa — 363 N Shelmore Blvd (salon)
• Langdon's Restaurant & Wine Bar — 778 S Shelmore Blvd (Shelmore Village Shopping Center at the entrance, adjacent to the I'On core)

Some early tenants — including Grind and Squeeze and Sweet Olive — have closed; Bacco, formerly at 976 Houston Northcutt (outside the I'On core), shuttered in early 2024.

• Two named lakes — East Lake and Westlake — plus Lafayette Canal with a pedestrian footbridge
• The Rookery Wildlife Refuge borders the trail system
• Roughly 2.5 miles of marsh-front paths, ~6 miles of walking trails, ~12 neighborhood parks, 5 playgrounds
• The Mount Pleasant Amphitheater (also called Westlake Amphitheatre) on the north end — Trust-programmed ticketed concerts, "Art in I'On," Memorial Day picnic, July 4 parade
• Community dock and boat ramp on Hobcaw Creek
• The Creek Club — waterfront event venue (>5,000 sqft, capacity 75–300) with dock access

The I'On Club is a private amenity business, not an HOA department. Membership is optional — the club serves both I'On owners and non-owners, and non-resident memberships are permitted under the neighborhood's boating-facilities easement. Current roster:

• 6 clay tennis courts — United States Tennis Association (USTA) Outstanding Tennis Facility of the Year Award recipient
• 4 dedicated hard pickleball courts
• 3 saline pools — an 8-lane, 25-yard year-round Junior Olympic lap pool; a seasonal adults-only lounge pool; a seasonal baby pool
• Fitness — two studios, cardio and strength equipment, weekly group classes, 24-hour member access
• The Lido — on-site restaurant with deck over the pools (Mediterranean and Lowcountry)
• Programs — USTA and Charleston Area Lawn Tennis Association (CALTA) leagues, swim team, junior academies, summer camps

Membership tiers are named Family, Couples, and Single/Individual; initiation fees, annual dues, and transferability rules require direct inquiry with the club.

I'On's ritual calendar runs through The I'On Trust, an I'On-affiliated nonprofit funded in part by the 0.10% seller-side transfer fee and positioned as the keeper of the spirit of I'On. The Trust underwrites grant recipients including:

• I'Onissimo! — neighborhood music ensemble (winds, strings, singing), active since at least the 2005 season
• Community of I'On Artists — arts council with rotating shows, running at the Creek Club since 2006; member work displays along Civitas Street
• Community garden — resident-initiated, Trust-sponsored at the neighborhood level
• Monthly rituals — First Fridays, women's coffee, lunch bunches, and large monthly potluck dinners (the "supper circle" format since 2006, still active into 2026)
• I'On BizNet — merchants' association that organized the 2006 I'On Pro Bike Race and BizNet Event Nights; currently lower-profile

Resident sentiment runs two ways at once. Residents praise the walkable village life, the downtown-Charleston feel, and the visible neighborhood programming, while some call the place "too planned" or "too manicured."

I'On is about 10–15 minutes from downtown Charleston via the Arthur Ravenel Jr. Bridge, and roughly 10–15 minutes to the Mount Pleasant beaches (Sullivan's Island, Isle of Palms). Charleston International Airport is about a 28-minute drive.

Retail is close in too: an ALDI sits less than a mile from the main Mathis Ferry entrance, and a Publix is within about 1.5 miles. Positionally, I'On sits south of the Isle of Palms Connector, south-east of Daniel Island, and south-west of Belle Hall. Transit Score is 0 — I'On is a walk-and-drive neighborhood, not a transit neighborhood.

I'On falls inside the Charleston County School District (CCSD), East Cooper attendance zone. Ratings below are from GreatSchools as of April 2026.

• James B. Edwards Elementary (zoned) — Grades PK, K–5. Enrollment 763, 15:1 ratio. GreatSchools 7/10 (Test Score 9/10). Magnet with Gifted & Talented and a Global Leadership Mission. Math 67% proficient (state 50%), English 73% (state 56%).
• Moultrie Middle (zoned) — Grades 6–8. Enrollment 1,119, 17:1 ratio. GreatSchools 9/10 (Test Score 10/10, Student Progress 9/10). English 85%, Math 73%, Algebra I 100%. Gifted & Talented and Project Lead The Way STEM.
• Lucy Garrett Beckham High (zoned) — Grades 9–12. Enrollment 1,673, 16:1 ratio. GreatSchools 9/10 (Test Score 9/10, College Readiness 10/10). Average SAT 1112 (state 1008); SAT participation 81%; 4-year graduation rate 92%. Beckham operates a Veterinary Science career-and-technical program under its Science & Innovation Pathway, and students can graduate with Veterinary Assistant Certification.
• East Cooper Montessori Charter (on-site) — Grades PK, K–8. Enrollment 432, 12:1 ratio. GreatSchools 7/10 (Test Score 10/10). Public charter with Montessori method and Gifted & Talented. Admission is lottery-based — attendance is not automatic for I'On residents despite the on-site location.

School zones can change between assessments; buyers should verify current assignment with CCSD at ccsdschools.com.

Base Assembly dues are approximately $1,650 per year. That covers commons maintenance, the administrative apparatus, and the governance regime described below. It does not include the I'On Club, which is a separate, optional membership.

I'On is governed by three distinct organizations — an unusual structure for a Charleston-area neighborhood:

1. The Assembly (I'On Assembly) — the homeowners association administering the recorded Declaration, rules (D-series), and architectural code
2. The I'On Trust — a separate nonprofit, funded in part by the 0.10% seller-side transfer fee, that runs cultural, arts, and volunteer programming
3. The I'On Club — a private amenity business (tennis, pickleball, pools, fitness, dining); not an HOA department

The Assembly is managed by Southern Community Services from an office at 159 Civitas Street, Suite 211.

The 0.25% transfer fee is split by payer rather than pooled:

• Buyer pays 0.15% to the Assembly — the "I'On Assembly Transfer Assessment," in effect since the January 4, 2010 Fourth Amendment to the Declaration (Book 0100, Page 681). The fee covers a broad purpose — commons maintenance, repair, replacement, and reducing the need for special assessments — and Assembly policy has historically directed about two-thirds to reserves and one-third to enhancements.
• Seller pays 0.10% to the I'On Trust — the "Trust Transfer Fee" under Article X of the original Declaration (Book C297, Page 282), deposited to a segregated Trust account for community-benefit programming.
• Both apply to the purchase price (excluding county taxes, stamps, and fees). Both transfer fees are consolidated in one 2012 recorded instrument (Notice of Transfer Fee Covenant, Book 0247, Page 625). Certain non-standard transfers are exempt — confirm applicability with the closing attorney.

Rule D-110 prohibits leasing for any period shorter than 28 consecutive days. The rule extends to any occupancy for consideration (leases, subleases, licenses, tenancies), and the management company may request a copy of the lease. The Assembly actively enforces the rule and periodically reminds owners of its scope. This covenant, independent of Mount Pleasant's town STR framework, is what keeps vacation rentals out of I'On.

The town-wide ordinance is a separate regime: permit required, 400-permit town-wide cap with a waitlist, two-tier permit (Part-Time 15–72 days/year; Full-Time 72+ days), local-agent response within 60 minutes, and prohibition in any neighborhood with restrictive covenants banning short-term lodging — which is how I'On's 28-day rule operates functionally.

The I'On Design Committee (IDC) reviews exterior and landscape changes. It may make aesthetic determinations, assess fines, and route appeals to the I'On Board of Appeals. Active Design Committee tradeoffs include signage rules and rooftop solar — the committee is moving from a blanket street-facing solar prohibition toward case-by-case review. Overhang and lot-coverage standards have been revised at the town level under Mount Pleasant's planned-development (PD) ordinance, which governs the I'On Code alongside the Assembly's own covenants. Board discretion versus member control is a live governance fault line inside the Assembly: titleholders have previously pushed for a 75% titleholder-vote threshold on certain board actions, and the question has not been fully settled.

I'On sits in Tax District 21 (TD21) — Town of Mount Pleasant. The 2025 combined millage is 260.4 mills (44.3 town + 216.1 countywide).

South Carolina classifies residential property at either a 4% primary-residence rate or 6% secondary/investment rate. At I'On's $2M+ price points, the gap between 4% and 6% is unusually consequential — often tens of thousands of dollars per year. Buyers planning to use an I'On home as a second residence should budget at the 6% rate. When a home sells, the county resets the assessed value to the current market value, with Local Option Sales Tax credits offsetting a portion of the bill. Owners who then establish primary residency can apply for the 4% classification for the following tax year.

Charleston County runs a five-year reassessment cycle, with a cap on assessed-value increases between reassessments for existing owners. For current figures, see the Charleston County Auditor.

Most of I'On sits in FEMA Zone X (minimal flood hazard), but the north and northwest edge carries AE exposure. The predominant zone across the neighborhood is Zone X; a pocket of Zone AE with Base Flood Elevations of 9–10 ft runs along the north/northwest edge adjacent to Lafayette Canal and marsh flats draining to Hobcaw Creek; a thin strip of shaded X (0.2% annual chance) sits along the north edge. There is no Zone VE — I'On is inland/creek-adjacent, not oceanfront.

• Zone X homes — flood insurance is optional for lenders; Preferred Risk pricing through the National Flood Insurance Program (NFIP) is typical where offered.
• AE homes along the northern marsh edge (around Eastlake, the Creek Club, and Lafayette Canal edges) — flood insurance is mandatory if financed, and NFIP pricing depends on how the home's elevation compares to the Base Flood Elevation (9–10 ft here).
• Shaded X (0.2% annual chance) — outside the Special Flood Hazard Area, but the strip should be disclosed.
• Parcel-level verification matters. Flood exposure is edge-dependent, not neighborhood-wide. Look up the specific address on the FEMA Flood Map Service Center or the FEMA Flood Map mobile app before making an offer.

Buyers should review the current FEMA flood map for their specific parcel before closing.

Beyond flood, every Mount Pleasant homeowner carries wind/hail exposure. The South Carolina Wind and Hail Underwriting Association ("Wind Pool") is the residual wind carrier for the coastal counties. Named-storm (hurricane) deductibles on private homeowners policies commonly run 2%–5% of the home's dwelling coverage limit. At I'On's price points, that deductible can exceed $40,000 on a $2M home.

I'On is a strong fit for buyers who value walkability, architectural consistency, and a genuinely active community calendar — and who can absorb both the price point and the governance overhead.

• Buyers who want downtown-Charleston feel without living on the peninsula
• Owners who will actually use a village core — dinners on the square, amphitheater nights, artist shows, monthly potlucks, racquets at the club
• Owners who appreciate architectural and landscape discipline and want their neighbors held to the same standard
• Buyers qualifying for the 4% primary-residence assessment who can use the neighborhood year-round

• Buyers who want larger lots — I'On runs compact (0.06–0.21 acres, median ~0.15 acre). Dunes West, Park West, or Carolina Park offer more land per dollar.
• Investors seeking short-term rental income — the 28-day covenant plus the town's capped-permit regime make nightly and weekly STR not workable here.
• Owners who bristle at design review — the IDC regulates plant gallon sizes, fence profiles, copper accents, signage, and solar visibility. The review is real, not nominal.
• Buyers wanting oceanfront or direct-deepwater access — I'On fronts Hobcaw Creek marsh, not the ocean or deepwater. Wild Dunes, Sullivan's Island, or Old Village sit closer to direct water.
• Buyers uncomfortable with AE-zone flood exposure — homes along the northern marsh edge require NFIP flood coverage.

• Commercial-core use intensity. The question of how active the village-edge commercial core should be — more retail and events versus more residential quiet — has been a recurring debate at the Mount Pleasant Planning Commission and inside the Assembly, and it remains unresolved.
• Traffic calming on Eastlake. Speeding on Eastlake has been a recurring concern inside the Assembly and at the town for two decades. No I'On-specific traffic-calming ordinance has resolved it.
• Design Committee process. The IDC is under active revision — interim inspections, more design-coordinator meetings, a shift toward case-by-case rooftop-solar review. Expect the rulebook to evolve during ownership.

• Charleston County School District — school assignment verification
• Charleston County Auditor — property tax estimates, millage cards
• Charleston County Assessor — 4% vs 6% assessment application
• Town of Mount Pleasant STR information — permit waitlist, business license, STR code
• FEMA Flood Map Service Center — parcel-level FIRM panel lookup
• The Assembly (I'On Assembly) — HOA documents, rules, board minutes
• The I'On Club — membership inquiry