Smithfield, NC
4 miles south
Median home built 1973 (Wilson's Mills: 1997); Power from its own town system (Wilson's Mills: Duke Energy Progress)
Attic insulation in SmithfieldAttic Insulation in Wilson's Mills, NC
Blown-in attic insulation for Wilson's Mills, NC, 4 miles from Smithfield, plus removal and air sealing.
About Wilson's Mills and Its Homes
Wilson's Mills is named for John Marshall Wilson, who ran a gristmill and cotton gin there in the mid-1800s, and it grew after the North Carolina Railroad arrived in 1856. The town was first chartered in 1868, but it was incorporated in its present form only in 1996.
Wilson's Mills, in Johnston County, grew from 2,555 people in 2020 to 2,987 in 2025 (Census Bureau estimates), on 6.38 square miles.
Wilson's Mills has about 830 housing units, 1 percent of Johnston County's; about 87 percent of the town's households own their home.
Wilson's Mills at a Glance
- County: Johnston County
- Population: 2,987 (2025), 2,555 (2020), up 16.9%
- Land area: 6.38 square miles (468 people each)
- Housing units: about 830 (±166)
- Median year built: 1997 (±3); Johnston County: 2000
- Owner-occupied: 87% (±8); Johnston County: 76%
- Attached houses: under 6%
- Apartments: under 6%
- Mobile homes: 17% (±9)
- Climate zone: 3 on both maps
- ENERGY STAR target for Wilson's Mills attics: R-49 from bare, R-38 over 3 to 4 inches (R-value guide)
Census Bureau estimates for Wilson's Mills, 2020 to 2024 (± margin of error).
Attic Insulation in Wilson's Mills
If the joists show above the insulation in a Wilson's Mills attic, ENERGY STAR says to add more insulation.
The Local Climate
Wilson's Mills' center sits about 230 feet above sea level, 5 miles from NOAA's Smithfield station, the best match for Wilson's Mills. The station's 1991 to 2020 normals average about 3,080 heating and 1,870 cooling degree days a year, so at Wilson's Mills' station, heating needs outweigh cooling.
Readings change over short distances around Wilson's Mills: NOAA's Clayton Water Plant station, 7 miles away, averages about 3,390 heating degree days.
Homes by Age: What It Means for the Attic
With about 830 housing units in Wilson's Mills, read the figures as rough proportions.
In 2010 or later, about 30 percent of Wilson's Mills homes went up; check their air sealing as well as the depth.
Homes by Year Built
- Before 1940: under 1%
- 1940s: under 19%, about 65 units
- 1950s: under 6%, about 25 units
- 1960s: 6% (±4), about 50 units
- 1970s: 5% (±4), about 45 units
- 1980s: 3% (±2), about 25 units
- 2000s: 13% (±6), about 105 units
- 2010s: 19% (±10), about 155 units
- 2020 or later: 9% (±5), about 80 units
Air Sealing and Duct Sealing in Wilson's Mills
In Wilson's Mills, 90 percent of homes heat with electricity; where that heat is forced air, ducts often run through the attic.
Air sealing comes first, as the EPA advises: wire and pipe holes, wall tops and soffits.
How Homes Here Are Heated
- Electricity: 90% (±2), about 730 households; Johnston County: 78%
- Piped gas: under 7%, about 25 households
- Bottled or tank gas: 3% (±2), about 25 households
Power, Gas and Rebates
Duke Energy Progress supplies Wilson's Mills' electricity. For gas, Wilson's Mills is in the Johnston County franchise of Piedmont Natural Gas, whose mains may not reach every street in Wilson's Mills. Duke's free House Call fits many Wilson's Mills homes: 90 percent heat with electricity.
Rebate to check in Wilson's Mills: Smart $aver Insulate and Seal (Duke Energy; Insulation Pros is an approved trade ally). Before a job in Wilson's Mills, check its current terms; the Johnston County page lists every program.
Attic Insulation Removal in Wilson's Mills
In a Wilson's Mills attic, only wet, moldy or animal-soiled insulation is vacuumed out (ENERGY STAR's test), once the cause is fixed, and after mice that Wilson's Mills attic is sanitized and deodorized; dry, clean insulation stays.
Also Serving Near Wilson's Mills
Nearest to Wilson's Mills first.
Selma, NC
5 miles southeast
7,406 people, about twice Wilson's Mills' population
Attic insulation in SelmaArcher Lodge, NC
7 miles north
Median home built 1996 (Wilson's Mills: 1997); Its NOAA station logs about 320 more heating degree days than Wilson's Mills'
Attic insulation in Archer LodgeClayton, NC
7 miles northwest
Median home built 2006 (Wilson's Mills: 1997); 32,633 people, about 11 times Wilson's Mills' population
Attic insulation in ClaytonPine Level, NC
9 miles southeast
2,405 people to Wilson's Mills' 2,987
Attic insulation in Pine Level
Wilson's Mills Insulation FAQs
Are there any historic district rules for houses in Wilson's Mills?
None that the state has on file. Search the preservation office's National Register rolls for Johnston County and Wilson's Mills does not appear, in town or nearby. Its 2023 roster of town commissions lists just Benson and Smithfield in the county. The town is gathering its past through an oral history project, but that carries no rules. Nothing about a historic designation changes how your attic is insulated or sealed.
Can blown insulation cover the can lights in my Wilson's Mills ceiling?
Only over fixtures marked IC, meaning rated for insulation contact. For a can without that mark, ENERGY STAR wants insulation held 3 inches or more away, with blown fill kept back by a collar of sheet metal or wire mesh. The housing figures on this page show the town's homes are mostly from 1970 on, so its cans can be of any age and either type. The label on the fixture is the only sure way to tell, and we read each one from the attic before insulating around it.
Does attic insulation in Wilson's Mills need a permit?
Wilson's Mills Town Hall can say whether Johnston County Building Inspections Department, the town itself or another office handles permits in Wilson's Mills; ask before work starts.
Helpful Guides
- Power from Duke Energy Progress: high summer electric bills and home energy audits
Sources
Census Bureau figures for Wilson's Mills, NOAA normals for the Smithfield station, Duke Energy Progress (October 2026). Compiled by Insulation Pros. How the town pages are made.
Sources for the Wilson's Mills introduction and questions (read October 20, 2026):
- About Wilson's Mills, Town of Wilson's Mills
- Wilson's Mills, in The North Carolina Gazetteer (William S. Powell, 2nd ed., UNC Press 2010), NCpedia
- Year Structure Built (table B25034), Wilson's Mills town, American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau via Census Reporter
- NC Listings in the National Register of Historic Places, NC State Historic Preservation Office
- Historic Preservation Commission Staff in North Carolina, listed by county, as of 2/20/2023 (NC HPO)
- Historical Preservation Project, Town of Wilson's Mills
- Attic Insulation Project, ENERGY STAR
Wilson's Mills, NC
Open in Google Maps (opens in a new tab)Serving Wilson's Mills, NC
Insulation Pros is an insulation contractor serving North Carolina, Wilson's Mills and the rest of Johnston County included.
Reach us
Send the square footage of your Wilson's Mills attic, or call (336) 870-3893.