Top Cost Segregation Firms For Small Residential Investors In 2027
Dominic Tarn
Head Writer - ReVerb
11.12.2026
Last updated: November 11, 2026
The best cost segregation firms for small residential investors in 2027 are Cost Seg Smart, R.E. Cost Seg and SMF Cost Segregation Advisors, followed by RentalWriteOff, CostSegRx and WeCostSeg. Cost Seg Smart leads on price for single-family homes and duplex to fourplex buildings, R.E. Cost Seg gives the clearest path from a low-cost report up to a fully engineered study, and SMF focuses specifically on investors with small portfolios.
This list is for owners with one to five doors: a single-family rental, a condo, a short-term rental, or a duplex, triplex or fourplex. At that size the study fee matters, because the tax benefit scales with the building’s value while many firms charge a flat minimum built for commercial property. The firms below price and process studies with small landlords in mind.
Before you order, it helps to know whether the numbers work for your property. Our guide to cost segregation for residential rental property walks through the break-even math, and our guide to study pricing shows what each type of study usually costs.
Small Residential Cost Segregation Firms At A Glance
Firm
Location
Founded
Specialty
Best For
1. Cost Seg Smart
Los Angeles, CA
Not published
Fast, low-cost remote studies
Lowest published price per door
2. R.E. Cost Seg
Houston, TX
2022
Investor-focused studies at two depths
Owners who want a choice of depth
3. SMF Cost Segregation Advisors
Not published
Not published
STR, SFR and buildings up to ten units
BRRRR and small multifamily investors
4. RentalWriteOff
Not published
Not published
Flat-fee remote studies for 1 to 4 unit rentals
One flat price per property
5. CostSegRx
Sarasota, FL
Not published
Engineer-prepared residential and commercial studies
Engineer plus accountant review
6. WeCostSeg
Not published
Not published
Tiered residential studies with long audit defense
Owners who want audit defense included
7. Cost Seg EZ
Princeton, NJ
2015
DIY, engineer-reviewed and engineered tiers
Owners who want to start DIY
8. CostSegregation.com by KBKG
KBKG offices in seven US cities
1999 (KBKG)
Self-guided online reports
DIY owners with a CPA
9. Basis Property Group
Philadelphia, PA
Not published
Fixed-price studies for rentals and vacation homes
Vacation rental and cabin owners
10. Maven Cost Segregation
Offices in MI, UT, CO, PA and San Diego
Not published
In-person inspections for residential and commercial
Higher-value homes that want a walk-through
How We Evaluated These Firms
We looked for firms that publish pricing or a clear pricing structure for single-family and two to four unit properties, accept small jobs without a high minimum, and explain what level of engineering review sits behind each report. Firms that offered a path from a low-cost report to a fuller study scored well, since small investors often start cheap and upgrade as their portfolio grows.
We also weighed turnaround time, audit support, Form 3115 support for properties bought in earlier years, and how clearly each firm explains when a study is not worth doing. Rankings are editorial. No firm paid to be included.
Best Cost Segregation Firms For Small Residential Investors In 2027
1. Cost Seg Smart — Published Tiers For Single-Family Homes And Two To Four Units
Cost Seg Smart publishes its prices by property type and purchase price, with studies starting at $495 for single-family homes, condos and short-term rentals, and a separate duplex to fourplex tier starting at $995. The price shown at checkout is the price, with no discovery call needed.
Studies are done remotely using construction cost data and property records, and the reports are built to be CPA-ready. Lookback studies for properties bought in earlier years are priced the same as standard studies, which suits investors who skipped cost segregation on their first few doors.
Best for: Owners of one to four unit rentals who want the lowest published price and a fast, fully online process.
2. R.E. Cost Seg — A Low-Cost Report Or A Full Engineered Study, Same Firm
R.E. Cost Seg offers two levels. The Rapid Report starts at $950 and replaces the site visit with a self-directed questionnaire and engineer review, with delivery in about five business days. The Fully Engineered Study adds a virtual or in-person site visit and takes longer.
The firm publishes candid guidance on small properties, including when a study will not pay for itself, and it offers Form 3115 preparation as an add-on. Every study includes audit support.
Best for: Small investors who want to start with a low-cost report on simple rentals and upgrade to an engineered study on larger ones.
SMF Cost Segregation Advisors focuses on the investors many larger firms overlook: single-family rentals, short-term rentals, duplexes through fourplexes and small buildings of up to ten units. It speaks directly to BRRRR investors and real estate professionals building a small portfolio.
Owners submit the property address or closing statement, purchase price, placed-in-service date and renovation details, and receive a preliminary savings estimate and proposal within 24 hours. That quick estimate helps you decide door by door whether a study makes sense.
Best for: Investors growing from a few doors toward ten who want a firm that specializes in that exact range.
4. RentalWriteOff — One Flat Fee For One To Four Unit Rentals
RentalWriteOff keeps it simple: an $899 flat fee per property, a fully remote process, and delivery in one to two business days after intake. Studies are engineering-based and expert-reviewed, built from appraisal or listing photos, public records and satellite imagery.
Form 3115 is included for eligible lookback studies, and audit support comes with every study. The company also has a dedicated short-term rental offering.
Best for: Landlords who want a predictable price per door and a study that is done within days.
5. CostSegRx — Engineer-Prepared Residential Studies With Accountant Review
CostSegRx lists residential studies starting at $895, with pricing based on scope of work. Each study is completed by its engineers and then reviewed by its accounting team before delivery, which gives small investors two sets of eyes on the report.
Every pricing tier includes audit support, Form 3115 and Section 481(a) support, and report revision support. That makes it a practical pick for owners who bought a rental in an earlier year and want to catch up.
Best for: Owners who want engineer preparation and accounting review at a published residential price.
6. WeCostSeg — Tiered Studies With Five Years Of Audit Defense
WeCostSeg offers three tiers. The Rapid Report starts at $795 for residential property under $800,000 of depreciable basis and is engineer-reviewed. Higher tiers add more engineering detail for owners who want it.
Every tier includes five years of audit defense, which is unusual at this price point and reassuring for small investors who do not have a CPA firm on retainer.
Best for: Small landlords who want a low entry price without giving up multi-year audit protection.
7. Cost Seg EZ — Three Levels Of Review, From DIY To Fully Engineered
Cost Seg EZ lets owners choose how much engineering review they want. The DIY tier costs $595 and returns results instantly. The Engineer Reviewed tier costs $895 and takes three to five business days. A Fully Engineered tier is available for owners who want the most detail.
That ladder works well for small investors, who can use the DIY tier on a simple condo and step up for a duplex with heavy renovations.
Best for: Hands-on investors comfortable entering their own property data who want to control cost per door.
CostSegregation.com is KBKG’s self-guided platform. Owners of eligible properties can generate a report online in under 15 minutes, with the methodology behind it coming from a firm that has offered cost segregation since 1999.
If a property later needs more depth, KBKG’s engineered studies are available from the same firm, so a small investor does not have to switch providers as the portfolio grows.
Best for: Do-it-yourself landlords who work with a CPA and want a name their accountant already recognizes.
9. Basis Property Group — Fixed Prices And An ROI Guarantee For Rentals And Cabins
Basis Property Group publishes its pricing by purchase price, with residential rental studies starting at $1,295 and the fee fixed before work begins. A free preliminary estimate comes first, then a licensed engineering team produces the study.
The company treats short-term rentals as a core market, includes audit support, and backs every study with a minimum ROI guarantee, which takes some of the risk out of ordering a study on a single door.
Best for: Owners of one or two vacation rentals or cabins who want an engineering team and a guaranteed return on the fee.
Maven Cost Segregation inspects properties in person rather than relying on a software estimate, and delivers reports within 30 days of the site visit with audit defense documentation. Founded by Sean Graham, CPA, it reports more than 5,000 studies delivered.
For a small investor, Maven is the step up when one property is valuable or unusual enough to justify an engineer on site, such as a luxury short-term rental or a heavily renovated fourplex.
Best for: Small investors with one higher-value property who want an in-person inspection behind the study.
How To Choose A Cost Segregation Firm As A Small Residential Investor
Does The Study Pay For Itself?
Compare the fee with the likely first-year tax savings. On a modest single-family rental, a low-cost remote study often makes more sense than a full engineered report. On a fourplex or a heavily renovated home, a fuller study can pay for itself many times over.
DIY and software reports are cheapest. Engineer-reviewed reports add a check. Fully engineered studies with a site visit are the most defensible. Match the depth to the property’s value and complexity.
Does The Firm Cover Duplexes Through Fourplexes?
Two to four unit buildings have more depreciable components per dollar than a single-family home. Make sure the firm prices them sensibly rather than as commercial jobs.
What Happens If You Are Audited?
Check whether audit support is included and for how long. Some firms include several years of defense on every tier.
Frequently Asked Questions
Is cost segregation worth it for one rental property?
It can be, especially if the depreciable basis is roughly $200,000 or more and you can use the losses. On a lower-value property, a low-cost remote study may still pay off, while a full engineered study may not.
How much does a cost segregation study cost for a small rental?
Remote and software-based studies for single-family rentals commonly start between about $500 and $1,300. Fully engineered studies with a site visit usually cost more. See our guide to cost segregation study pricing.
Does a duplex or fourplex get more benefit than a single-family rental?
Often yes, because each unit adds its own kitchen, bathrooms, flooring and fixtures, all of which can qualify for shorter depreciation lives.
Can I do a study on a rental I bought years ago?
Yes. A lookback study lets your CPA catch up missed depreciation with Form 3115, usually without amending old returns. See our list of cost segregation firms for lookback studies.
Conclusion
For owners with one to five doors, Cost Seg Smart is the price leader, R.E. Cost Seg gives the most flexible path from a low-cost report to an engineered study, and SMF Cost Segregation Advisors is the specialist for small portfolios. RentalWriteOff, CostSegRx and WeCostSeg are strong flat-fee options, while Maven is the pick when one property deserves an in-person inspection.
