Insulation and air sealing for Kiawah Island homes: attics, crawl spaces, rim joists and walls, starting with a free assessment of the R-value you actually have. The typical home here dates to the late-1980s, and 0% of its 3,865 homes went up before 1940.
Kiawah Island runs to about 11 square miles and roughly 2,326 people. It sits about 13 miles southwest of downtown Charleston. That is roughly 3,865 housing units. The community dates back to 1988. We cover ZIP code 29455.
Our job history shows nothing in Kiawah Island so far. Plenty of sites will show you a number here anyway.
The typical home in Kiawah Island dates to around the late-1980s. Houses of this vintage usually got batts or blown fiber at whatever the standard of the day was, which is well short of what is recommended now. Most are one top-up away from being right.
Resort-community homes and villas built mostly since the mid-1970s, following the first summer houses of the 1950s.
That includes Rhett's Bluff and Sandy Point. Housing age and construction shift across Kiawah Island, sometimes by decades within a few streets, which is why we look in the attic before quoting rather than after.
Kiawah is a barrier island run as a private gated beach and golf community where visitors need a pass at the gate. The first summer homes went up in 1954 on Eugenia Avenue, lot sales for the planned resort began in 1976, and since 1994 land use has followed development agreements.
The Census Bureau estimates 3,865 homes in Kiawah Island. 7 of them (0%) went up before 1940 — 21st of 28 places on this site for pre-1940 housing. The 1980s were the busiest decade, adding 1,333 of today's homes (34%); 20% predate 1980 and 28% were built in 2000 or later. For Charleston County as a whole the pre-1940 share is 5%, so Kiawah Island sits below it.
Of 1,211 occupied homes, 2% heat with utility gas and 84% with electricity; another 13% burn propane or other tank gas. Electric heat here is more common than across the county (76%), and ranks 11th of 28 on this site. That is why the assessment asks how the house is heated: the fuel and the name on the utility bill decide which program, if any, can pay toward the work.
99% of occupied homes are owner-occupied and 69% of all homes are single-family detached houses. Read together, those numbers point toward an energy assessment before deciding what to fix first.
| Built | Homes | Share | |
|---|---|---|---|
| Before 1940 | 7 | 0% | |
| 1940s | 0 | 0% | |
| 1950s | 0 | 0% | |
| 1960s | 0 | 0% | |
| 1970s | 782 | 20% | |
| 1980s | 1,333 | 34% | |
| 1990s | 654 | 17% | |
| 2000s | 672 | 17% | |
| 2010s | 371 | 10% | |
| 2020 or later | 46 | 1% |
3,865 homes, Census ACS 2020–2024 (B25034, B25040, B25003); 1,211 occupied.
1,987 of Kiawah Island's 3,865 homes (51%) were built in the 1980s and 1990s. The gaps in houses of that age are the parts nobody sealed: batts stuffed into the rim joist, bare spots over cathedral and tray ceilings, soffit vents buried with no baffles, can lights punched through the ceiling plane. A top-up plus a day of sealing usually covers it.
Kiawah Island enforces the South Carolina Energy Standard (the 2009 IECC), by state law. Town Building Ordinance 2013-08 adopts each code in the version the South Carolina Building Codes Council most recently adopted, with the state's changes, and calls for energy-code inspections that check insulation R-values.
That edition sets R-30 for the attic in new work, and R-13 for walls. The Department of Energy's recommendation for this climate zone runs higher: R49 for an attic with nothing in it, R38 where a few inches are already down.
Table 402.1.1 of the 2009 IECC, climate zone 3, which South Carolina's Energy Standard Act adopts for the whole state (section 6-10-30 of the South Carolina Code).
Kiawah Island requires a permit for this work. Kiawah's building ordinance says anyone who intends to alter or repair a building must first apply for and get a permit. Its list of work that needs no permit (floor covering, trim, drywall, painting, counter tops, tiling, cabinets, gutters, siding and the like) does not include insulation. The ordinance also calls for an insulation inspection before wall coverings go on, and energy-code inspections that check insulation R-values. We pull it as part of the job.
The published number is 843-768-9166. The department page is here.
Permitting is on us, not on you.
Part of Kiawah Island sits inside Berkeley Electric Cooperative's territory, by the cooperative's own map, and Dominion Energy South Carolina is also on record in Charleston County: check whose name is on the electric bill first. For Dominion Energy South Carolina customers with electric heat, Home Energy Check-up Plus covers 90% of the cost of attic insulation, air sealing and duct sealing, with a ceiling of $2,880, on jobs completed by March 31, 2027 after the free Home Energy Check-up; the program's own contractor does that work, not us.
Berkeley Electric lends rather than rebates: its HomeAdvantage program lends up to $20,000 at 5%, with an energy audit first and the payments added to the electric bill. Income-qualified households can apply to Palmetto Community Action Partnership (843-720-5336) for free weatherization instead. The full program rules are in the rebate guide.
Every layer of an insulated attic, explained
Kiawah Island borders Seabrook Island, Johns Island, Kiawah River and Atlantic Ocean. These are the ones we also cover, each with its own energy code and permit rule:
Elsewhere in Charleston County we also cover:
South Carolina sets the residential energy code statewide, so the attic figure is R-30 wherever it is published here; what changes is the permit desk, and 7 of the 7 publish a permit rule for insulation.
| City | Energy code | Attic R required | Permit to insulate | Building dept. |
|---|---|---|---|---|
| Kiawah Island | 2009 IECC (state law) | R-30 | Yes | 843-768-9166 |
| Seabrook Island | 2009 IECC (state law) | R-30 | Yes | 843-202-6930 |
| Johns Island | 2009 IECC (state law) | R-30 | Yes | 843-577-5550 |
| Adams Run | 2009 IECC (state law) | R-30 | Yes | 843-202-6930 |
| Awendaw | 2009 IECC (state law) | R-30 | Yes | 843-202-6930 |
| Charleston | 2009 IECC (state law) | R-30 | Yes | 843-577-5550 |
| Unincorporated Charleston County | 2009 IECC (state law) | R-30 | Yes | 843-202-6930 |
All 22 Charleston County jurisdictions side by side →
Kiawah Island enforces the 2009 IECC (state law), which sets R-30 for an attic in new work. Whether it reaches a retrofit of an existing house is not published.
Yes. Kiawah Island requires a permit for this work, and we pull it as part of the job.
Dominion Energy South Carolina's Check-up Plus pays 90% of attic insulation, air sealing and duct sealing, up to $2,880, until March 31, 2027, for electrically heated homes; the program's contractor does the work. Berkeley Electric members get a 5% on-bill loan instead of a rebate. The federal 25C credit ended for work placed in service after December 31, 2025.
The typical home in Kiawah Island dates to around the late-1980s; the Census Bureau's 2020-2024 median year built is 1989. Of its 3,865 homes, 0% went up before 1940 and 28% in 2000 or later. Half the homes here are older than that and half newer; yours may sit at either end.
Code and permit facts checked October 24, 2026, rebates October 24, 2026; housing: Census ACS 2020–2024. Sources: kiawahisland.gov (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13) · scstatehouse.gov (2) · en.wikipedia.org (2, 3) · scencyclopedia.org · www2.census.gov · dominionenergy.com · berkeleyelectric.coop · santeecooper.com · coastal.coop · energystar.gov · data.census.gov. These change; confirm with the building department at 843-768-9166 or the utility named on your electric bill first.
Free assessment, a measured R-value, and photos you keep either way.
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