R.E. Cost Seg vs Cost Seg Smart: Residential, STR, Multifamily Compared (2026)

In one paragraph

R.E. Cost Seg (recostseg.com) and Cost Seg Smart both produce residential and STR cost segregation studies under the same IRS ATG methodology, industry-standard construction cost data, MACRS classification per Rev. Proc. 87-56, Form 3115 §481(a) lookback support. R.E. Cost Seg's Rapid Report tier prices at around $950 for residential under 4 units with basis below $800K, scaling to $2,800+ for their Fully Engineered tier on larger properties. Turnaround on their Rapid tier is roughly 1, 2 weeks. Cost Seg Smart's automated residential studies work from satellite imagery, county assessor records, and structured property data, delivered in under 60 minutes, starting at $495 for residential under $300K basis and $795 for 2, 4 unit small multifamily. Our CPA partner program lets your own CPA become the named reviewer on your study, branded under their firm if they want. R.E. Cost Seg is the right call when the property exceeds their Rapid tier thresholds and you want their Fully Engineered tier. Cost Seg Smart is the right call for sub-$1M residential and STR where same-day turnaround at automated pricing wins, with your CPA in the named-reviewer seat via our partner program.

Disclosure: Cost Seg Smart operates this comparison and is one of the firms compared here. See the methodology page for our standalone documentation.

At a glance: residential and STR comparison

Dimension	Cost Seg Smart	R.E. Cost Seg
Price (residential under $1M)	$495, $895	$950 (Rapid Report)
Price (larger / commercial)	$1,995, $6,995	$2,800+ (Fully Engineered)
Turnaround	Under 1 hour	1, 2 weeks (Rapid); 4, 8 wk (Engineered)
Site visit	No (remote observation)	No (Rapid); optional (Engineered)
Methodology	industry-standard 2026 construction cost data + MACRS + ATG	construction cost data + MACRS + ATG
Named-CPA review	Your CPA, via our partner program (private-label optional)	In-house CPA byline (Mitchell Baldridge)
Audit defense	Internal technical review & QC + free CPA response, 36-month window	Engineer attestation + audit support
Form 3115 lookback	Included	Included
Best fit	Sub-$1M residential / STR / small MF; speed-sensitive filings	CPA-byline-sensitive buyers; properties above Rapid thresholds
Free revision policy	Yes, if your CPA can't use the report	Varies

Methodology overlap (both firms)

The technical machinery is the same at both firms. Both use:

industry-standard 2026 construction cost data with regional cost multipliers, the standard engineering reference for component-level reclassification.
MACRS classification per Rev. Proc. 87-56, the asset-class table incorporated into IRS Pub. 946 Appendix B that determines 5-, 7-, 15-, 27.5-, or 39-year recovery periods.
IRS Cost Segregation Audit Techniques Guide (Pub 5653), the 13-element quality framework that defines what a defensible study contains.
Form 3115 §481(a) lookback support for properties owned 2+ years without a prior cost-seg study; both firms produce the depreciation schedule the CPA files with the DCN 7 election.
Reviewed deliverable, R.E. Cost Seg includes a licensed engineer's sign-off; Cost Seg Smart includes internal technical review & QC confirming the methodology was applied correctly.

What differs is voice and labor model, not engineering. R.E. Cost Seg leans on an in-house named-CPA editorial voice (Mitchell Baldridge's byline appears throughout their blog and reports). Cost Seg Smart leans on an automated pipeline plus a CPA partner program that puts your own CPA in the named-reviewer seat — the CPA who already knows your portfolio can review, sign off, and (optionally) brand the study under their own firm.

Where Cost Seg Smart wins

When should I choose Cost Seg Smart over R.E. Cost Seg?

Sub-$300K residential. At $495 our entry tier serves a price band R.E. Cost Seg's $950 Rapid doesn't cover economically; the study fee is a meaningful fraction of the Year-1 benefit on the smallest properties, so the price gap matters.
Speed-sensitive filings. Under-1-hour turnaround vs 1, 2 weeks on R.E. Cost Seg's Rapid tier. If your CPA needs the schedule for a return in extension, this is the deciding factor.
Small multifamily (2, 4 unit). $795 vs $950+. Same defensible report.
STR owners on event-driven properties. Pacific Beach, Old Town Scottsdale, Joshua Tree, structured-data observation plus structured cost data handles FF&E density (pool equipment, outdoor kitchens, themed furnishings) the same way an engineer would.
Speed-of-iteration on portfolios. 5-property portfolio in 1 hour vs 5, 10 weeks at R.E. Cost Seg Rapid. The hourly delta compounds.

Where R.E. Cost Seg wins

When should I choose R.E. Cost Seg over Cost Seg Smart?

Properties above R.E. Cost Seg's Rapid thresholds. Their Fully Engineered tier ($2,800+) handles larger residential / small commercial where the Rapid tier's algorithmic basis doesn't apply.
Buyers who discovered cost seg through BiggerPockets STR-investing forums, where R.E. Cost Seg has deep editorial presence. If the educational journey was already on their blog, continuing the engagement there reduces friction.
Strong audit-risk content library. Their /post/irs-audit-cost-segregation post is a frequently-referenced authority on what triggers IRS scrutiny; if reading that content was a buying signal, the engagement match is strong.

How to decide

Three questions to ask:

Does your CPA want to be the named reviewer on the study? If yes, our CPA partner program puts them in that seat (review + optional private-label under their firm). If your CPA prefers a third-party vendor's in-house byline instead, R.E. Cost Seg's Mitchell Baldridge name is in their reports.
Is the property under $300K basis? If yes, the price gap ($495 vs $950) is material; Cost Seg Smart's pricing was built for this band.
Do you need the schedule this week? If yes, Cost Seg Smart's under-1-hour turnaround vs R.E. Cost Seg's 1, 2 weeks is the deciding factor.

If you want to see the math on a specific property before deciding, our free calculator gives a Year-1 estimate in 30 seconds. Full methodology details are at /methodology/, pricing tiers at /cheap-cost-segregation/.

For a wider cross-provider view, costsegregationreviews.com publishes how different firms approach engineering studies, useful as an editorial reference rather than a sales path.

Frequently asked

Is R.E. Cost Seg a legitimate cost segregation provider?

Yes. R.E. Cost Seg produces IRS ATG-aligned engineered studies using industry-standard construction cost data and MACRS classification per Rev. Proc. 87-56. Their reports are CPA-acceptable and audit-defensible. The methodological framework is the same one used by every legitimate cost-seg provider including Cost Seg Smart. The choice between providers comes down to pricing tier, turnaround, and whether you want your own CPA in the named-reviewer seat (Cost Seg Smart's partner program) or a third-party vendor's in-house byline (R.E. Cost Seg).

How does R.E. Cost Seg's Rapid Report compare to Cost Seg Smart's automated study?

Both are designed for residential properties under defined thresholds (R.E. Cost Seg: under 4 units, basis below $800K, capex under $50K; Cost Seg Smart: under $1M residential / STR / small MF). Both deliver reviewed reports with the same MACRS framework and industry-standard construction cost data (R.E. Cost Seg via licensed-engineer attestation; Cost Seg Smart via internal technical review & QC). Differences: turnaround (Cost Seg Smart under 1 hour vs R.E. Cost Seg 1, 2 weeks), entry price (Cost Seg Smart $495 vs R.E. Cost Seg $950), and named-author vs operator-disclosed editorial voice.

Can my CPA file a cost segregation study from R.E. Cost Seg the same way as one from Cost Seg Smart?

Yes. Both firms produce reports with the same components your CPA needs: depreciation schedules, MACRS class assignments per Rev. Proc. 87-56, component-level basis documentation, methodology narrative addressing the IRS Pub 5653 13 quality elements, and Form 3115 §481(a) catch-up schedules for lookback studies. Your CPA will process them identically.

When is R.E. Cost Seg's Fully Engineered tier the right call instead of automated?

When the property exceeds the Rapid Report thresholds (over 4 units, basis above $800K, capex above $50K, or commercial). At that point R.E. Cost Seg's $2,800+ Fully Engineered tier or Cost Seg Smart's $1,995+ commercial automated tier are both options. For properties with unusual specialty assets (custom commercial kitchens, specialty MEP, ground-up specialty construction), an on-site engineering visit may capture details that structured-data approaches miss; both firms offer engineered tiers for that case.

Does Cost Seg Smart have audit-defense scope comparable to R.E. Cost Seg?

Yes. Both firms provide a reviewed report (R.E. Cost Seg via licensed-engineer attestation; Cost Seg Smart via internal technical review & QC), written responses to IRS examiner information document requests (IDRs) about methodology and component classifications, and Form 3115 / §481(a) re-derivation support if a lookback study is examined. Cost Seg Smart's audit support is included for 36 months at no additional charge. Audit support does not include taxpayer representation at the examination, your CPA, EA, or attorney handles representation, mirroring the standard across every cost-seg engineering firm.

R.E. Cost Seg vs. Cost Seg Smart, residential and STR cost segregation compared.