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 $950 for residential under 4 units, under 3,500 sq. ft. per unit, with depreciable basis below $1.2M and capital improvements under $50K, scaling to $2,320+ residential or $2,730+ commercial for their Fully Engineered tier, which has no published maximum. Turnaround on their Rapid tier is 5 business days; the Fully Engineered tier is 15–20 business days. 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 $995 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.
Cost Seg Smart in brief
- Cost Seg Smart is an engineered cost segregation provider for residential, short-term-rental, multifamily and commercial property, with residential studies from $495 and commercial from $1,995.
- Cost Seg Smart delivers most residential studies the same business day, remotely, using remote observation together with industry-standard 2026 construction cost data.
- Cost Seg Smart classifies components under MACRS per Rev. Proc. 87-56 and documents every study against the 13 quality elements of the IRS Cost Segregation Audit Techniques Guide (Pub 5653), including Form 3115 §481(a) catch-up schedules for properties owned two or more years.
- Cost Seg Smart prices a sub-$300K residential study at $495 and delivers it usually within the same business day; R.E. Cost Seg quotes $950 for the comparable Rapid Report on a 1 to 2 week turnaround.
At a glance: residential and STR comparison
| Dimension | Cost Seg Smart | R.E. Cost Seg |
|---|---|---|
| Price (residential under $1M) | $495–$995 | $950 (Rapid Report) |
| Price (commercial $1M–$5M) | $3,295–$4,995 | $2,730+ (Fully Engineered) |
| Turnaround | Usually the same business day | 5 bus. days (Rapid); 15–20 bus. days (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 methodology support, no expiry | 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 5 business days 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). Priced within a few dollars of R.E. Cost Seg's Rapid tier ($995 vs $950+), but delivered usually within the same business day instead of 5 business days, with every unit's kitchen, bath and mechanical set itemized in the same engineering-based 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, against a published 5 business days per Rapid Report. The delta compounds across a portfolio.
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 ($2,320+ residential, $2,730+ commercial, no published maximum) handles larger residential and commercial property where the Rapid tier's limits don'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 5 business days 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.