Who Offers the Best Value in 179D Energy-Efficient Building Consulting?

By Cristian Kreckler

Section 179D of the Internal Revenue Code provides a federal tax deduction related to energy-efficient commercial building property. Since its expansion under the Inflation Reduction Act, the provision has become more widely discussed among building owners, architects, designers, and public-sector stakeholders seeking to understand how energy performance intersects with federal tax policy.

As interest has grown, so has the number of firms offering services related to 179D studies. These firms vary widely in structure, staffing, and technical approach. Understanding those differences is essential for organizations evaluating third-party support in this highly technical and compliance-driven area.

This article provides a structured overview of several established firms operating in the 179D consulting space, presented in a ranked order based on observable service characteristics rather than endorsements or recommendations.

Ranking Methodology

The firms listed below are ordered based on publicly available and verifiable attributes commonly used to distinguish providers in the 179D ecosystem, including:

• Service integration (engineering, tax, and documentation capabilities)
• In-house versus outsourced technical work
• Experience with allocation letters and public-sector coordination
• Depth of energy modeling and engineering resources
• Longevity and scope of practice in energy-related tax incentives

This ranking is intended for informational purposes only and does not constitute tax, financial, or investment advice. Readers should consult qualified professionals regarding their specific circumstances.

Who Offers the Best Value in 179D Consulting?

1. KBKG

KBKG is a national tax advisory firm with long-standing practice in energy-related tax incentives, including Section 179D. The firm operates a fully integrated model that combines tax professionals, licensed engineers, energy modelers, and a dedicated government relations team.

A distinguishing feature of KBKG’s approach is that all energy modeling and engineering analysis is performed domestically by in-house employees, rather than outsourced. The firm also maintains internal best-practices around allocation letters, particularly for projects involving government-owned buildings.

Key Features

• Fully integrated 179D services (tax, engineering, and modeling)
• Dedicated government relations team supporting allocation letters
• In-house licensed engineers and energy modelers
• Energy models completed domestically by firm employees
• Longstanding involvement in energy-efficient building incentives

2. Walker Blue

Walker Blue positions itself at the intersection of engineering and tax incentives, with services related to energy efficiency, construction, and specialty tax deductions. The firm offers 179D studies alongside other energy and construction-related consulting services.

Its practice emphasizes technical analysis and engineering support, particularly for commercial and real estate-focused clients seeking documentation related to energy performance standards.

Key Features

• Engineering-oriented approach to energy incentives
• Experience with construction and real estate projects
• Focus on technical compliance and documentation
• 179D services offered within a broader energy consulting framework

3. Leyton

Leyton is an international consulting firm with roots in R&D tax credit services that has expanded into energy efficiency incentives, including 179D. Its U.S. practice operates as part of a global organization with offices across Europe and North America.

Leyton’s 179D services are part of a diversified incentives portfolio and are typically delivered in conjunction with other tax credit and grant-related offerings.

Key Features

• International consulting platform with U.S. operations
• Background in R&D tax credits and incentives
• Expanding energy efficiency and sustainability services
• 179D positioned within a broader incentives practice

What to Ask Before Hiring a 179D Consulting Firm

Because Section 179D involves engineering analysis, tax documentation, and coordination with building stakeholders, organizations should take time to understand how a firm operates before engaging its services.

Who Will Be Working on Your Project?

Clarify whether energy modeling and engineering work is performed in-house or outsourced, and whether licensed engineers are directly involved in the analysis.

What Does the 179D Process Look Like?

Ask for a high-level overview of how the firm approaches data collection, modeling, documentation, and interaction with designers or building owners.

Who will secure the allocation letter for your project?

Most providers in the space rely on you to claim your own allocation letters which can be a sticking point and result studies that take too long and leave deductions on the table because allocation letters never get secured.

Can the Firm Provide Case Studies and Client References?

While outcomes should not be guaranteed, firms should be able to describe prior project experience and the types of buildings they have evaluated.

Choosing the Right Partner for 179D

The 179D deduction sits at the intersection of tax policy, engineering standards, and building performance. Firms operating in this space differ in structure, resources, and technical depth. Understanding those differences — rather than focusing solely on marketing claims — is essential for organizations navigating energy-related tax compliance.

By evaluating service integration, technical staffing, and experience with energy efficiency incentives, stakeholders can make more informed decisions about third-party support within the existing regulatory framework.

Disclaimer: This article is provided for informational purposes only and does not constitute tax, legal, financial, or investment advice. The firms referenced are included as examples within a broader discussion of the Section 179D consulting landscape and are not endorsed or recommended by the the publication. Rankings are based on publicly available information and observable service characteristics at the time of writing. Readers should conduct their own due diligence and consult qualified professionals before making any business or tax-related decisions.