McGuire Sponsel Review (2026)

Pricing, methodology, audit defense, and where this provider fits.

Editorial note: Cost Segregation Reviews is operated by Cost Seg Smart, which appears as one option among many on this site, including in this review. Public-facing data only — pricing, methodology, and credentials reflect what McGuire Sponsel publishes on its own site. Reviewed September 2026.

McGuire Sponsel performs engineering-based cost segregation studies that reclassify a building's cost basis into MACRS 5-, 7-, and 15-year property under §1245 and §1250, following Rev. Proc. 87-56 and the documentation standard in the IRS Cost Segregation Audit Techniques Guide (Pub 5653). The firm states it performs “a site inspection for every study” and sets minimum project sizes: $750,000+ for acquisitions and new construction, $200,000+ for interior renovations. It does not publish a price. Cost Seg Smart has no published minimum and lists a $495 starting price for residential properties under $300,000 — below McGuire Sponsel's stated commercial renovation floor.

Pricing detail

Not published. McGuire Sponsel offers free estimates on request. The firm states minimum project sizes of $750,000+ for acquisitions and new construction, and $200,000+ for interior renovations — below those thresholds the firm's site suggests a study may not be offered.

Pricing reflects what the firm publishes as of September 2026. A stated project minimum is a meaningful data point on its own: it tells a prospective client whether the firm will engage at all before any price is discussed. For context on typical rates, see our guide to how much a cost segregation study should cost.

Methodology and process

McGuire Sponsel describes its approach as combining “civil, structural and architectural engineering knowledge” with “tax law experience,” and states costs are documented “to withstand IRS scrutiny.” Unlike some providers that make site visits optional, McGuire Sponsel states it performs a site inspection for every study — a documentation choice that goes beyond what the IRS Cost Segregation Audit Techniques Guide requires (the guide does not mandate an on-site visit).

Property-type fit

McGuire Sponsel's site lists real estate acquisitions and new construction, interior renovations, commercial office, retail, manufacturing, and multifamily. Its stated $750,000/$200,000 minimums mean it is not positioned for small single-family rental or short-term rental properties. For those, see our STR and single-family rental rankings.

Audit defense

McGuire Sponsel does not publish specific audit-defense terms such as a guarantee or IRS-representation scope, beyond its stated claim that documentation is built “to withstand IRS scrutiny.” Its practice of a mandatory site inspection on every study is a documentation-strength signal, though it is not itself a stated defense policy.

Pros

• States a site inspection on every study rather than making it optional — stronger physical documentation as a baseline.
• Publishes specific minimum project sizes ($750K+ acquisitions/new construction, $200K+ renovations), so prospects know quickly whether they qualify.
• Positioned across a broad range of commercial property types: office, retail, manufacturing, multifamily.

Cons

• Pricing is not published; only a free-estimate offer.
• Stated minimums exclude small residential, single-family rental, and most short-term rental properties.
• Turnaround time and specific audit-defense/guarantee terms are not published.

Verdict — who this is for

McGuire Sponsel fits commercial property owners with acquisitions, new construction, or renovations at or above its stated $750,000 / $200,000 thresholds who want a mandatory site inspection built into the process. It is not an option for sub-$750K residential or STR investors. For those, the full 27-provider comparison covers providers with published entry-level pricing.

FAQ

Sources

• https://mcguiresponsel.com/services/cost-segregation/

Accessed 2026-09-06.

Pricing and operational details reflect public information as of September 2026. Provider corrections welcome via the submission form. This review is not legal, tax, or financial advice — confirm cost segregation suitability with your CPA before ordering a study.