Spray foam insulation quotes in District of Columbia

Our District of Columbia service area

Area	County	Zone	Median year built	Pre-1980	Gas heat	Heating degree days
Washington	District of Columbia	4A	1958	69%	48%	4,049

Electric utilities in our District of Columbia counties

Potomac Electric Power Co (14.7¢/kWh).

EIA-861 2024 residential prices.

District of Columbia energy code

District of Columbia Energy Conservation Code (2015 IECC base with DC amendments), effective May 29, 2020. DC amendments raise several insulation requirements above the model code. (NAHB)

The District writes its own insulation minimums

DC enforces one energy code for the whole District. DOE lists residential enforcement as "Mandatory Statewide," rates the District's amended code as equivalent to the 2018 IECC, and puts its efficiency gain over the model code it adopted at 4.10%. The most recent certification DC submitted to DOE is for the 2009 IECC. DOE estimates the 2024 IECC would add $3,469 to a new DC home and save $371 a year, a payback of 9.3 years, on about 314 housing starts a year.

DOB's 2017 DC Construction Codes are the 2015 ICC model codes amended by Title 12 of the DC Municipal Regulations, subtitles A through M. DOB warns that its integrated code books leave out amendments adopted after May 29, 2020, and that Title 12 DCMR is the official text. In 12-I DCMR, DC strikes the IECC's zone-by-zone table and replaces it with a single set of minimums:

Insulation that is part of an alteration must meet this table too. New homes and gut rehabs must test at 3 ACH50 or less (dwelling units in multifamily buildings of three stories or less may instead meet 0.30 CFM50 per square foot of enclosure), by an approved third party. The air barrier table says air-permeable insulation "shall not be used as a sealing material" and calls for Grade I installation, or Grade II where a surface has a continuous layer of air-impermeable insulation above R-5. Gut rehab here means a Level 3 alteration affecting 80% or more of the building's aggregate area. In that case, existing exterior walls, ceilings and floors outside the scope of work must be insulated too: walls to R-7.5 continuous or R-13 cavity (air-permeable cavity insulation must fill the cavity), ceilings to R-49 and floors to R-25, or with ceiling and floor cavities filled as far as possible. Walls are exempt where meeting this would take substantial reconfiguration of interior spaces. PNNL's county data places the District in climate zone 4A, Mixed-Humid, on both the 2015 and 2021 maps.

Sources: U.S. DOE Building Energy Codes Program, Washington, DC status; DC Department of Buildings, 2017 DC Construction Codes; DC Department of Buildings, DC Construction Codes; 12-I DCMR (Residential Provisions), Section R402 Building Thermal Envelope, effective 5/29/2020 (DCRegs); 12-I DCMR (Residential Provisions), Section R503 Alterations, 67 DCR 6326 (DCRegs); PNNL-33270, Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (data files).

Permits and historic districts

DOB requires a permit for interior alterations, including finished basements. Its list of work that needs no permit (brick pointing, caulking and patching, storm windows, finish work, up to 160 square feet of gypsum board and similar items) does not mention insulation, and none of those exemptions apply in a historic district. DC's Office of the Attorney General says most home improvement work in the District needs a permit. Skipping one can mean fines for the homeowner, trouble selling the home and unsafe work. If a contractor pulls the permit, check that DOB actually issued it, using DOB's Public Dashboard or Scout, before work starts. Confirm the permit path for your exact job with DOB.

In historic districts, the Historic Preservation Office says interior alterations (except designated historic interiors) need a building permit but no preservation review. In-kind or compatible roofing replacement qualifies for HPO's expedited staff review. HPO's roof guidelines say a flat roof is typically not visible from the ground, while the cornice, parapet or pent roof at its edge is almost always visible and often contributes significantly to the building's character. They add that the location of roof insulation rarely affects a building's appearance, but insulation that is not properly installed may cause roof materials to deteriorate.

Sources: DC Department of Buildings, How to Get a Permit; DC Office of the Attorney General, "Consumer Alert: How To Avoid Home Improvement Scams and Disputes" (August 16, 2023); DC Office of Planning, Work Exempt from Preservation Review; DC Office of Planning, Work Qualifying for HPO Review; DC Historic Preservation Office, Roofs on Historic Buildings (guidelines, undated PDF).

DCSEU rebates don't cover insulation

The DC Sustainable Energy Utility was created by the Clean and Affordable Energy Act of 2008 and runs under a DOEE contract. Its residential rebate list for fiscal year 2027 (October 1, 2026 to September 30, 2027) covers electrification, appliances and electronics, heating and cooling, and electric lawn care. It has no insulation, air sealing or weatherization category, so a spray foam job by itself earns no DCSEU rebate. Amounts run $25 to $800 for appliances, $250 to $5,000 for heat pumps, heat pump water heaters and window air conditioners, and $400 to $2,000 for heavy-ups and circuit additions. Total rebates are capped at $15,000 per household per fiscal year, and improvements must stay installed for at least a year (or their life, if shorter).

The Affordable Home Electrification Program, run by DCSEU with each project subject to DOEE approval, replaces gas or oil equipment with a heat pump, heat pump water heater, induction stove, heat pump dryer and thermostat at no cost to income-qualified owners and renters in buildings of four or fewer units. Condo and co-op owners in larger buildings also qualify. Households in SNAP, TANF, SSI, LIHEAP, WAP or Solar for All (households of up to four people) qualify automatically; otherwise these limits apply:

DOEE is using its federal Home Energy Rebates money to expand AHEP and the Affordable Housing Retrofit Accelerator, and says federally funded rebates will not be available outside those two programs. Its plan for the Healthy Homes and Residential Electrification Amendment Act of 2024, a local law directing no-cost electrification retrofits for low-income households and qualifying multifamily buildings, builds on those federal applications. DOEE posted updated consumer protection plans for both federal programs in September 2025. District homeowners can also book free one-on-one home energy coaching or attend coaching events sponsored by Electrify DC.

Sources: DCSEU, Residential Rebates; DCSEU, Apply for Residential Rebates; DCSEU, Terms & Conditions (Residential Efficient Products, 10/1/2026 to 09/30/2027); DCSEU, Affordable Home Electrification; DOEE, Federal Home Energy Rebates and the Healthy Homes Act of 2024.

Pepco and Washington Gas

Neither utility offers a District insulation rebate that we found. The Pepco DC program we found is Energy Wise Rewards: it installs a web-programmable thermostat or outdoor switch, cycles it at peak times and pays bill credits. Washington Gas says it "works with the District of Columbia Sustainable Energy Utility" and sends DC customers to DCSEU for rebates. Confirm with Pepco or Washington Gas before you count on anything new.

Sources: Pepco, Energy Wise Rewards DC; Washington Gas, Small Residential Builders (rebates by region).

Free weatherization through DOEE

DOEE's Weatherization Assistance Program performs energy audits and installs the measures the audit recommends, which can include insulation, duct sealing, air infiltration work, heating and cooling repairs, roof repair and mold remediation. Households qualify with income below 60% of state median income or a member on TANF or SSI. The home can't be in foreclosure, pending redevelopment or up for sale. In properties with 2 to 4 units at least half the households must qualify, and in buildings with 5 or more units at least 66%. DOEE's page says WAP openings are delayed this fiscal year due to unexpected external circumstances; its Emergency Mechanical Systems program is open.

After approval, DOEE assigns a nonprofit that arranges contractors, aiming for work within 21 days depending on funding and contractor capacity. The nonprofit, DOEE and, where applicable, DOB inspect the work before the contractor is paid. Call 202-299-3316 to ask about eligibility.

Sources: DOEE, Weatherization Assistance Program (WAP).

District tax credits for insulation: none found

We found no DC tax credit for insulation; confirm with the DC Office of Tax and Revenue (OTR). OTR's individual and property tax credit pages list no energy efficiency or insulation credit. Separately, DCSEU posted that many federal Inflation Reduction Act clean energy tax credits were ending in December 2025.

Sources: DC Office of Tax and Revenue, Individuals; DC Office of Tax and Revenue, Real Property Tax Reliefs, Credits, and Deductions; DCSEU, Residential Rebates.

Home improvement contractors need a DLCP license and a salesperson

The Department of Licensing and Consumer Protection licenses home improvement contractors. The application needs tax registration and a Clean Hands certification, a $25,000 surety bond for the two-year license term (or a cash bond with DLCP), a police criminal history report, the contractor's home improvement contract, corporate registration if applicable, a certificate of occupancy or home occupation permit, and liability insurance. Home improvement contractors can't take a 6-month license; terms are 2 or 4 years. Every home improvement contractor, and every general contractor doing residential work, must designate and maintain a Basic Business License for at least one Home Improvement Salesperson. That salesperson license needs a passport photo, a driver's license and a police report, and it must be tied to a home improvement or general contractor license.

The Attorney General's office says to verify a license through DLCP's website or at 202-671-4500. District regulations require a written contract, signed by you and the contractor, before a contractor accepts payment. That contract must give the contractor's name, address, phone and DC license number, the payment terms, approximate start and finish dates, and specifications of the work and materials. Contractors may not have you sign a contract with blank spaces, and you are entitled to a reasonable chance to review it and to a copy when you sign.

Sources: DLCP, Contractor and Construction Services; DLCP, Surety Bond Details; DLCP, Employee/Independent Salesperson; DC Office of the Attorney General, "Consumer Alert: How To Avoid Home Improvement Scams and Disputes" (August 16, 2023).

Utility insulation programs

District of Columbia state Home Energy Rebates

Cost ranges and foam basics: spray foam guide.