Attic insulation, air sealing and crawl space work across Berkeley County. We cover 10 jurisdictions here, each with its own page: the energy code that applies, the attic R-value it requires, the permit position and the building department's number. Of the county's 100,600 homes, 1% were built before 1940, and 77% of occupied homes heat with electricity.
Click a city for its full code, permit and rebate detail.
| City | Energy code | Attic R required | Permit to insulate | Building dept. |
|---|---|---|---|---|
| Unincorporated Berkeley County | 2009 IECC (state law) | R-30 | Not published | 843-719-4292 |
| Bonneau | 2009 IECC (state law) | R-30 | Not published | 843-825-3385 |
| Daniel Island | 2009 IECC (state law) | R-30 | Yes | 843-577-5550 |
| Goose Creek | 2009 IECC (state law) | R-30 | Not published | 843-797-6220 ext. 1508 |
| Hanahan | 2009 IECC (state law) | R-30 | Yes | 843-576-5259 |
| Ladson | 2009 IECC (state law) | R-30 | Not published | 843-719-4292 |
| Moncks Corner | 2009 IECC (state law) | R-30 | Not published | 843-719-7914 |
| Pinopolis | 2009 IECC (state law) | R-30 | Not published | 843-719-4292 |
| Sangaree | 2009 IECC (state law) | R-30 | Not published | 843-719-4292 |
| St. Stephen | 2009 IECC (state law) | R-30 | Not published | 843-567-3597 |
All 10 publish an energy code edition we could name and all 10 a required R-value we could read; a blank in this table means the jurisdiction publishes nothing, not that we guessed.
South Carolina writes one residential energy code for the whole state, and under S.C. Code 6-10-40 a town may vary it only with the state Building Codes Council's approval, so the attic figure for new work is R-30 in every one of the 10 places we cover in Berkeley County. What changes from town to town is the permit desk.
Here, Daniel Island and Hanahan require a permit for insulation work; Daniel Island, Goose Creek, Hanahan, Moncks Corner and St. Stephen require contractors to register. The town pages carry each department's number.
The 8 places here with their own Census row hold 43,512 of Berkeley County's 100,600 homes (43%); the rest are in other municipalities or unincorporated areas.
Berkeley County has 100,600 homes in the Census count, with a median year built of 2002. 19% were built before 1980 and 54% in 2000 or later; the single biggest decade was the 2010s, with 23,400 homes (23%). Of 93,711 occupied homes, 19% heat with utility gas and 77% with electricity.
Across the 8 places we cover here, Pinopolis has the oldest housing (11% before 1940) and Moncks Corner the newest (59% built in 2000 or later). Goose Creek is the largest, at 18,500 homes, and Sangaree has the most electric heat (100%).
| Place | Homes | Before 1940 | Median built | Electric heat | Owner-occupied |
|---|---|---|---|---|---|
| Goose Creek | 18,500 | 0% | 2002 | 81% | 68% |
| Hanahan | 8,671 | 0% | 1986 | 65% | 68% |
| Ladson | 6,196 | 0% | 1990 | 91% | 77% |
| Moncks Corner | 5,482 | 3% | 2007 | 75% | 74% |
| Sangaree | 3,439 | 0% | 1986 | 100% | 85% |
| St. Stephen | 565 | 4% | 1985 | 96% | 59% |
| Pinopolis | 427 | 11% | 1982 | 94% | 97% |
| Bonneau | 232 | 0% | 1984 | 88% | 77% |
Against the three-county metro on this site (378,268 homes), Berkeley County's pre-1940 share of 1% compares with 3%, and its electric-heat share of 77% with 76%. 2,403 occupied homes (3%) burn propane or other tank gas and 69 (0%) heat with wood, which matters because neither fuel comes with a gas utility's program attached. 75% of occupied homes are owner-occupied and 66% of all homes are single-family detached houses.
In Berkeley County that adds up to 17,819 homes from the 1950s to the 1970s, the usual candidates for an attic top-up; 54,038 built since 2000, where air sealing tends to matter more than extra depth.
| Built | Homes | Share | |
|---|---|---|---|
| Before 1940 | 1,003 | 1% | |
| 1940s | 695 | 1% | |
| 1950s | 2,259 | 2% | |
| 1960s | 5,315 | 5% | |
| 1970s | 10,245 | 10% | |
| 1980s | 14,909 | 15% | |
| 1990s | 12,136 | 12% | |
| 2000s | 21,862 | 22% | |
| 2010s | 23,400 | 23% | |
| 2020 or later | 8,776 | 9% |
Figures: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates (tables B25001, B25003, B25024, B25034, B25035, B25040). Survey estimates carry margins of error, widest in the smallest places. Census table.
Homes across Berkeley County buy electricity from Dominion Energy South Carolina, Berkeley Electric Cooperative, Santee Cooper and Edisto Electric Cooperative, and the name on the bill decides which program applies. If Dominion Energy South Carolina sends the bill and the house heats with electricity, Check-up Plus covers 90% of an attic, air sealing and duct sealing job, to $2,880, through March 31, 2027; it starts with Dominion's free check-up and uses the program's own contractor.
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. Santee Cooper's 2026 program pays $500 toward replacing most of a home's ductwork, but nothing toward insulation. Income-qualified households can apply to Palmetto Community Action Partnership (843-720-5336) for free weatherization instead. The rebate guide carries the full rules.
It depends on the city, not the county. Across Berkeley County, 2 of the 10 jurisdictions we cover require a permit for insulation work (Daniel Island, Hanahan); the other 8 publish no rule either way. Each town page says which applies and gives the building department's number.
R-30 for new work, in all 10 jurisdictions we cover in Berkeley County (Unincorporated Berkeley County, Bonneau, Daniel Island, Goose Creek, Hanahan, Ladson, Moncks Corner, Pinopolis). The Department of Energy's recommendation for an uninsulated attic in this climate zone is higher, at R49.
The Census Bureau's 2020–2024 estimates put 1% of Berkeley County's 100,600 homes before 1940 and 19% before 1980, with a median year built of 2002.
It depends on the electric utility, and Berkeley County has 4: Dominion Energy South Carolina, Berkeley Electric Cooperative, Santee Cooper and Edisto Electric Cooperative. Dominion's Check-up Plus pays 90% of attic insulation, air sealing and duct sealing, up to $2,880, through March 31, 2027, for electrically heated homes, through its own contractor. 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. Santee Cooper's 2026 program pays $500 toward replacing most of a home's ductwork, but nothing toward insulation. The state's federal Home Energy Rebates have not opened.
Yes, through the South Carolina Weatherization Assistance Program, which Palmetto Community Action Partnership runs for Berkeley County (843-720-5336). If the household income qualifies, the work can be free rather than discounted.
Free assessment, a measured R-value, and photos you keep either way.
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