Insulation and air sealing for Adams Run 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 mid-1980s, and 10% of its 234 homes went up before 1940.
Adams Run runs to about 1.4 square miles and roughly 469 people. It sits about 24 miles west of downtown Charleston. Around 234 housing units sit inside those boundaries. We cover ZIP codes 29426 and 29449.
No completed job in Adams Run is logged in our records yet, and this page will say so until one is.
The typical home in Adams Run dates to around the mid-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.
Adams Run is a small, rural unincorporated community in western Charleston County, first counted by the Census as its own place in 2020, with a post office dating from 1843. Several plantation houses, the King Cemetery and the Willtown Bluff site are on the National Register.
The Census Bureau estimates 234 homes in Adams Run. 24 of them (10%) went up before 1940 — the 5th-highest share of pre-1940 housing among the 28 places on this site. The 1950s were the busiest decade, adding 54 of today's homes (23%); 46% predate 1980 and 26% were built in 2000 or later. For Charleston County as a whole the pre-1940 share is 5%, so Adams Run sits above it.
Of 214 occupied homes, 0% heat with utility gas and 65% with electricity; another 35% burn propane or other tank gas. Electric heat here is less common than across the county (76%), and ranks 26th 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.
92% of occupied homes are owner-occupied and 56% of all homes are single-family detached houses, with 103 mobile homes in the count. On a housing mix like this, the likely starting points are an energy assessment before deciding what to fix first.
| Built | Homes | Share | |
|---|---|---|---|
| Before 1940 | 24 | 10% | |
| 1940s | 29 | 12% | |
| 1950s | 54 | 23% | |
| 1960s | 0 | 0% | |
| 1970s | 0 | 0% | |
| 1980s | 24 | 10% | |
| 1990s | 42 | 18% | |
| 2000s | 35 | 15% | |
| 2010s | 26 | 11% | |
| 2020 or later | 0 | 0% |
234 homes, Census ACS 2020–2024 (B25034, B25040, B25003); 214 occupied.
66 of Adams Run's 234 homes (28%) 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.
Adams Run enforces the South Carolina Energy Standard (the 2009 IECC), by state law. As part of unincorporated Charleston County, Adams Run comes under the county's code list and its energy-efficiency inspections.
For new work, the attic number under that edition is R-30, with walls at R-13. Set that against the Department of Energy, which recommends R49 for an uninsulated attic in this climate zone and R38 for one that already has a few inches.
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).
Adams Run requires a permit for this work. Adams Run is unincorporated, so Charleston County's building code applies, and it lists insulation as work that needs a permit. The county waives the permit only for jobs under $1,000 that need no inspection and are done by the homeowner or a single-trade specialty contractor. We pull it as part of the job.
The published number is 843-202-6930. The department page is here.
Permitting is on us, not on you.
Berkeley Electric Cooperative's own territory map shows none of its service inside Adams Run; the other electric utility on record for Charleston County is Dominion Energy South Carolina. 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.
Income-qualified households can apply to Palmetto Community Action Partnership (843-720-5336) for free weatherization instead. The Charleston County page and the rebate guide carry the full rules.
Every layer of an insulated attic, explained
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. |
|---|---|---|---|---|
| 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 |
| Edisto Island | 2009 IECC (state law) | R-30 | Yes | 843-202-6930 |
| Folly Beach | 2009 IECC (state law) | R-30 | Yes | 843-588-2447 |
| Hollywood | 2009 IECC (state law) | R-30 | Yes | 864-586-6111 |
All 22 Charleston County jurisdictions side by side →
Adams Run 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. Adams Run requires a permit for this work, and we pull it as part of the job.
If Dominion Energy South Carolina is your electric utility and the house has electric heat, Check-up Plus pays 90% of attic insulation, air sealing and duct sealing, up to $2,880, through March 31, 2027, through its own contractor. Berkeley Electric's map shows none of its service here. The federal 25C credit ended for work placed in service after December 31, 2025.
The typical home in Adams Run dates to around the mid-1980s; the Census Bureau's 2020-2024 median year built is 1984. Of its 234 homes, 10% went up before 1940 and 26% in 2000 or later. That is a median across the whole place, so your own house may be older or newer.
Code and permit facts checked October 24, 2026, rebates October 24, 2026; housing: Census ACS 2020–2024. Sources: charlestoncounty.gov (2, 3, 4, 5, 6, 7, 8, 9, 10, 11) · scstatehouse.gov · www2.census.gov (2) · llr.sc.gov · en.wikipedia.org (2) · townofmeggettsc.org · dominionenergy.com · berkeleyelectric.coop · santeecooper.com · coastal.coop · energystar.gov · data.census.gov. These change; confirm with the building department at 843-202-6930 or the utility named on your electric bill first.
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