Section ENERGY STAR v3.0/v3.1

Section 45L of the Internal Revenue Code, added by the Inflation Reduction Act of 2022, establishes a business energy tax credit for eligible contractors who construct or substantially renovate qualified energy efficient dwelling units in the United States. The credit applies to single-family homes, multifamily buildings, and manufactured homes that meet the energy saving requirements of IRC Chapter 45. Each unit must be certified through the ENERGY STAR Residential New Construction program or the Department of Energy Efficient New Homes program. The qualified verifier (QV) for single-family or manufactured homes and the qualified energy professional (QEP) for multifamily projects must inspect the building envelope, test the thermal envelope, run energy modeling, and certify each unit before the taxpayer can claim the credit on their annual return.

The base credit is $2,500 per dwelling unit for new construction and $5,000 per substantially renovated unit. Projects that satisfy prevailing wage and apprenticeship requirements qualify for a five-times multiplier, raising the credit to $12,500 and $25,000 per unit respectively. The credit follows a 10-year structure under 45L(c)(1) for standard projects and a 15-year structure under 45L(c)(2) for prevailing wage compliant projects. A unit cannot claim both structures. New construction must achieve at least a 10 percent reduction in modeled energy use compared to the reference design, and renovation projects must achieve at least a 30 percent reduction. The building envelope, thermal envelope, and whole-building tiers under Chapter 45 provide separate compliance paths. The verifier issues the qualified improvement plan certification on the prescribed form, the taxpayer files it with their return, and the credit applies to units acquired before July 1, 2026.

Builders and developers constructing single-family subdivisions or multifamily projects need a 45L verification to qualify for the per-unit tax credit. The credit can reach $25,000 per unit with the prevailing wage multiplier, which makes it a material line item on any large project. Eligible contractors are the persons who constructed the dwelling, owned and had a basis in it during construction, and sold or leased it as a residence. Self-build owners who construct their own home and sell it to a buyer can qualify if they meet the eligible contractor definition and secure a qualified verifier certification before the acquisition date.

CPAs and tax professionals advising builder clients must confirm that each unit has a valid certification on file before completing the tax return. Multifamily sponsors and affordable housing developers pursuing the enhanced credit need to coordinate with the state energy office or HUD-approved program administrator for the allocation process. General contractors managing the construction schedule should engage the verifier early, because the inspection and modeling timeline must align with the completion of the building envelope and mechanical systems. Any party with a tax basis in a qualified dwelling unit should verify eligibility before the placed-in-service deadline.

The 45L credit is governed by IRC Chapter 45, which defines the energy saving requirements for new construction and renovations. 2021 and 2026 IRC editions establish the building envelope, thermal envelope, and whole-building tiers each unit must satisfy. IRS Notice 2023-65 provides guidance on eligible contractors, credit amounts, certification and substantiation. The One Big Beautiful Bill Act of 2025 adjusted the acquisition deadline.

The program administrator in each state, the state energy office or a HUD-approved administrator, manages the allocation process for multifamily projects claiming the enhanced credit. The qualified verifier (QV) must hold accreditation through a recognized rating body and issue the qualified improvement plan certification. The qualified energy professional (QEP) performs the same role for multifamily and coordinates with the program administrator. New construction must achieve a 10 percent reduction in modeled energy use, and renovation projects a 30 percent reduction.

The 10-year structure under 45L(c)(1) covers standard units. The 15-year structure under 45L(c)(2) applies to prevailing wage compliant projects and those serving households at or below five times area median income for multifamily. A unit may claim one structure but not both. The taxpayer claims the credit on Form 8908 and retains the certification, inspection reports, and ENERGY STAR or ZERH documentation in their tax records.

How the 45l tax credit process works at HECS

1. Scoping and eligibility review: review the project plans, dwelling unit count, and construction type to determine the applicable energy program path and establish the qualified improvement plan scope with the builder or developer before construction begins.
2. On-site inspection and testing: perform blower door testing, duct leakage testing, and thermal envelope inspection at rough-in and final stages to verify compliance with IRC Chapter 45 energy saving requirements.
3. Energy modeling and documentation: run RESNET-accredited HERS modeling or equivalent multifamily energy analysis to demonstrate the required percentage reduction in modeled energy use for each dwelling unit.
4. Report assembly and certification: compile inspection results, model outputs, and compliance documentation, then issue the qualified improvement plan certification on the appropriate form for the taxpayer to attach to their return.
5. CPA coordination and filing support: deliver the signed certification package to the taxpayer and their CPA for Form 8908 filing, and assist with program administrator allocation documentation for multifamily projects.

What affects the cost of 45l tax credit

The cost of a 45L verification depends primarily on the number and type of dwelling units in the project and the scope of the inspection and modeling work required. Single-family detached homes require fewer modeled systems and less field time per unit than attached townhomes or multifamily buildings. The total unit count affects the per-unit cost through economies of scale: a 200-unit multifamily building spreads the fixed scoping and reporting costs over more units than a 10-unit subdivision.

Additional cost drivers include the number of mechanical systems that must be modeled, the complexity of the building envelope, whether the project pursues prevailing wage documentation for the enhanced credit, and the geographic region’s program administrator requirements. Rush turnaround and out-of-cycle inspections add to the cost. Every verification includes the scoping visit, field inspections at rough-in and final stages, blower door and duct leakage tests, energy modeling, report generation, and the signed certification. Contact HECS for a project-specific quote based on your dwelling unit type, count, and timeline.

Why HECS for FORTIFIED Roof

HECS holds multiple credentials that cover the full compliance stack for residential and multifamily construction. Our team includes ENERGY STAR verifiers, NGBS Green verifiers, EarthCraft certifiers, RESNET and BPI accredited raters, and FORTIFIED evaluators. A single provider handles the FORTIFIED Roof evaluation verification, the ENERGY STAR certification, the code compliance HERS rating, and any additional green building program the project pursues. This eliminates the coordination gaps that appear when different trades test the same building envelope separately. The builder deals with one inspector, one report, and one certification timeline.

HECS operates as an independent third-party firm with no financial interest in the construction or sale of the dwelling units. Our regional footprint covers Kentucky, North Carolina, Alabama, Georgia, West Virginia, Kansas, Missouri, and West Virginia, which means we understand the climate zones, code editions, and program administrator structures across these states. We have delivered verifications since 2009 and maintain the documentation systems that builders and CPAs need at tax filing time. Every certification package includes the signed form, model outputs, and inspection records organized for IRS substantiation.

Contact HECS to scope your FORTIFIED Roof evaluation verification. We review your project plans, identify the applicable energy program path, provide a firm timeline, and deliver the signed certification your CPA needs to support the credit on your return. Call(502) 643-7160, email hecs@hecsusa.com, or visit our contact page at /contact/. Serving Kentucky, North Carolina, Alabama, Georgia, West Virginia, Kansas, Missouri, and West Virginia.