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Insulation in Washington, DC

Compare 5 local insulation pros. Typical service: $1406–$2711.

Top Insulation Companies in Washington

  1. 1.Crawl Space Brothers

    4.8★ (93 reviews)

    4.8★ from 93 reviews

    +15715823591Website

  2. 2.Koala Insulation of Washington DC

    5.0★ (43 reviews)

    5.0★ from 43 reviews

    +12023356571Website

  3. 3.Energy Efficiency Experts

    5.0★ (7 reviews)

    5.0★ from 7 reviews

    +12025579200Website

  4. 4.DMV ATTIC

    4.1★ (8 reviews)

    4.1★ from 8 reviews

    +12025166980Website

  5. 5.Perfect Insulation Assistance

    +16692023220

Insulation Cost in Washington

Local ranges, adjusted for area wage and cost-of-living data.

ServiceTypical range in Washington
Attic blown-in insulation$1,406–$2,711/job
Attic spray foam$3,012–$6,024/job

Insulation prices in Washington run about 0% above the national average, based on what this trade earns in the metro area — so neighbouring cities in the same metro see similar rates.

Quotes on this page come from 5 companies serving Washington, rated 4.7★ on average across 151 customer reviews.

Washington Climate & Seasonal Timing

What Washington's weather means for scheduling insulation.

Last spring frost
April 1
First fall frost
November 2
Annual precipitation
43.53"
Heating degree days
4,178
Cooling degree days
1,533
MonthLowHighPrecip
Jan26.7°44.3°3.09"
Feb28.8°48°2.9"
Mar36°56.4°3.72"
Apr45.3°67.5°3.51"
May55.1°76.7°4.28"
Jun64.7°85.6°4.08"
Jul69.6°89.6°4.32"
Aug67.7°88.3°3.41"
Sep59.4°81.1°3.76"
Oct47°69.9°3.79"
Nov38.3°59.3°3.47"
Dec30.1°48.2°3.2"

NOAA station data 2.57 miles from Washington.

Permits & Regulations in DC

  • Home improvement contracts over $300 in the District, including painting, require a Basic Business License with the Home Improvement Contractor endorsement
  • The endorsement requires a $25,000 surety bond
  • Work that disturbs paint in homes built before 1978 must be done by a Lead-Safe Certified firm under the EPA Renovation, Repair and Painting Rule

License required: DC Home Improvement Contractor endorsement (contracts over $300)

Sources: dlcp.dc.gov, dlcp.dc.gov, www.epa.gov

Insulation FAQs for Washington

How much does attic insulation cost in Washington?

Blown-in attic insulation in Washington typically runs $1406-$2711 for a 1,000 square foot attic; spray foam costs two to three times more.

How many insulation contractors serve Washington?

We track 5 insulation contractors serving Washington.

Is insulation in Washington more expensive than average?

Installation labor in Washington runs about +0.4% versus the national average.

How much insulation does a home in Washington need?

Washington sees about 4,178 heating degree days and 1,533 cooling degree days a year; the colder the climate, the higher the attic R-value worth paying for.

Does insulation help with Washington summers?

Yes -- with summer highs near 90F in Washington, attic insulation cuts the heat load on the air conditioner as much as it holds heat in winter.

Do insulation contractors in DC need a license?

In DC, Home improvement contracts over $300 in the District, including painting, require a Basic Business License with the Home Improvement Contractor endorsement. Adding attic insulation in Washington rarely needs a permit.

Is spray foam worth it in Washington?

Spray foam earns its price mainly when ducts or an air handler sit in the attic; otherwise blown-in at $1406-$2711 gets most Washington homes the same R-value for less.

How many quotes should I get for insulation in Washington?

Two or three; with 5 insulation contractors serving Washington, compare the R-value and depth each quote installs, not just the price.