Attic Insulation in Martin County, NC

Martin County and Its Homes

Martin County shrank 2 percent from 2020 to 2025, to 21,601 people by the Census Bureau's estimate, in about 11,100 housing units.

Its nine incorporated towns each have a page here: Williamston, Robersonville, Jamesville, Hamilton, Oak City, Parmele, Everetts, Bear Grass and Hassell. About 40 percent of Martin County's housing units are inside town limits, the rest in unincorporated areas.

A tall red-brick courthouse with a square tower in Williamston, North Carolina — The old Martin County Courthouse in Williamston, the county seat Photo: Ser Amantio di Nicolao, CC BY 3.0, via Wikimedia Commons; cropped and resized

Martin County at a Glance

Population: 21,601 (2025), 21,954 (2020)
Housing units: about 11,100
Median year built: 1975 (North Carolina: 1991)
Built before 1980: 56% (statewide: 34%)
Detached houses: 68%
Mobile homes: 22%
Owner-occupied: 67%
Heated with electricity: 66% (statewide: 65%)
Climate zone: 3 on both maps
Towns with pages here: 9

Census Bureau estimates for Martin County (housing: 2020 to 2024).

Towns in Martin County

Williamston
5,086 people · median home 1962 · Dominion Energy North Carolina
Robersonville
1,237 people · median home 1964 · its own electric system
Jamesville
411 people · Dominion Energy North Carolina
Hamilton
297 people · its own electric system
Oak City
266 people · its own electric system
Parmele
246 people · Dominion Energy North Carolina
Everetts
144 people · Dominion Energy North Carolina
Bear Grass
81 people · Dominion Energy North Carolina
Hassell
47 people · Edgecombe-Martin County EMC

What We Do in Martin County

Attic Insulation in Martin County
Some 56 percent of Martin County housing units predate 1980; joists showing above their insulation mean more blown-in fiberglass is due, R-49 from bare.
Attic Insulation Removal in Martin County
Wet, moldy or animal-soiled insulation comes out of Martin County attics, and a mouse-soiled Martin County attic is sanitized and deodorized; in the 29 percent of homes built before 1960, vermiculite is ruled out first.
Air Sealing in Martin County
Some 66 percent of Martin County homes heat with electricity, often through attic ducts; their joints and the ceiling's gaps are sealed first.

Homes in Martin County

Half of Martin County's 11,100 housing units were built before 1975: 44 percent before 1970 (22 percent statewide), 56 percent before 1980 (nearly all before the state's 1978 insulation rule) and 6 percent in 2010 or later (16 percent statewide). The largest share went up in the 1960s; fiberglass from those years may have settled, so check its depth against the joists.

Martin County by type: 68 percent detached houses, 10 percent in buildings of two or more homes and 22 percent mobile homes (11 percent statewide). In Martin County, 66 percent of homes heat with electricity, 4 percent with piped gas, 25 percent with tank gas (6 percent statewide) and 4 percent with oil or kerosene.

Martin County Homes by Year Built

Before 1940: about 1,050 units, 9% (±2)
1940s: about 700 units, 6% (±2)
1950s: about 1,450 units, 13% (±3)
1960s: about 1,680 units, 15% (±3)
1970s: about 1,350 units, 12% (±2)
1980s: about 1,260 units, 11% (±3)
1990s: about 1,480 units, 13% (±2)
2000s: about 1,420 units, 13% (±2)
2010s: about 620 units, 6% (±2)
2020 or later: about 60 units, 1% (±1)

Climate Across Martin County

NOAA 1991 to 2020 normals for Martin County towns, by station: Williamston 1 E station (Williamston, Robersonville, Jamesville, Hamilton and 3 more): about 3,030 heating and 1,770 cooling degree days; Lewiston station (Oak City): about 3,140 heating and 1,750 cooling degree days; Greenville station (Parmele): about 2,940 heating and 1,920 cooling degree days.

Power and Gas in Martin County

The card lists Martin County's town utilities by the territory maps; a power bill confirms the one at an address.

Piedmont Natural Gas holds the Martin County gas franchise (NC Utilities Commission map), and 4 percent of Martin County homes heat with piped gas.

Who Supplies Power in Martin County

Dominion Energy North Carolina: Williamston, Jamesville, Parmele, Everetts and Bear Grass
Edgecombe-Martin County EMC: Hassell; homes near Hamilton, Oak City and Parmele
Robersonville's own electric system: Robersonville
Hamilton's own electric system: Hamilton
Oak City's own electric system: Oak City

Energy Programs for Martin County Homes

Check each program's current terms for a Martin County home; some pay only through the utility's contractor network.

Programs for Martin County

Home Energy Evaluation (Dominion Energy rebate; Williamston, Jamesville, Parmele, Everetts and more).
Free energy audit (Edgecombe-Martin County EMC; Hassell, near Hamilton, near Oak City and near Parmele): a free home energy audit for members.
ElectriCities energy audits (ElectriCities member towns; Robersonville and Hamilton).
Income and Age Qualifying Home Improvements (Dominion Energy income-qualified; Williamston, Jamesville, Parmele, Everetts and more).
Energy Saver North Carolina (statewide income-qualified; any Martin County address).
Weatherization Assistance Program (statewide income-qualified; any Martin County address).
Piedmont Natural Gas lists rebates for high-efficiency gas furnaces, and none for insulation or air sealing (program page).

Get Your Free Estimate

or call (336) 870-3893

Martin County Insulation FAQs

Do you serve all of Martin County?

Yes: Williamston, Robersonville, Jamesville, Hamilton, Oak City, Parmele, Everetts, Bear Grass and one more town, and every unincorporated Martin County address.

Which utilities offer insulation rebates in Martin County?

Dominion Energy's Home Energy Evaluation (Williamston, Jamesville, Parmele, Everetts and more).

Does attic insulation in Martin County need a permit?

Ask Martin County Building Inspections before work starts. For an address in Williamston, Robersonville, Jamesville or another Martin County town, the town or city hall can tell you whether Martin County's office handles its permits.