How to Find a Qualified Cost Segregation Engineer for Your Mobile Home Park

You have decided to pursue a cost segregation study on your mobile home park. Your MHP accountant recommends it. The numbers look right. Now you need to find someone to actually perform the study — and here is where MHP owners consistently run into trouble.

The cost segregation industry is largely unregulated. Anyone can call themselves a cost segregation specialist. The quality of studies varies enormously, and a low-quality study — one that can’t survive IRS scrutiny — is worse than no study at all. It exposes you to accuracy-related penalties, disallowed deductions, and an amended return that wipes out the benefit you thought you had locked in.

This guide tells you exactly what qualifies someone to perform a defensible cost segregation study on a mobile home park, what questions to ask before you hire, and how your tax advisor and the engineer should work together.

What Actually Qualifies a Cost Segregation Engineer

The IRS has issued detailed guidance on cost segregation in its Cost Segregation Audit Techniques Guide (ATG), a document that any qualified engineer should know well. The ATG identifies the qualifications the IRS expects from cost segregation professionals and describes the methodologies it considers acceptable.

A genuinely qualified cost segregation engineer is typically a licensed engineer (PE — Professional Engineer) or an architect with demonstrated knowledge of building systems and construction costs. They also need substantial tax knowledge — specifically around MACRS depreciation categories, court cases involving asset classification, and IRS guidance on personal property versus structural components.

A CPA alone is not a qualified cost segregation engineer. An engineer who has never worked on tax issues is not either. The discipline genuinely requires both. The best firms employ engineers and tax professionals working in tandem, or individuals who hold both credentials.

MHP-specific experience matters for reasons that go beyond generic competency. Mobile home parks have asset categories — park-owned homes, utility pedestals, water and sewer infrastructure, entrance features, manufactured home pads — that are different from apartments, commercial buildings, or industrial properties. An engineer who only works on commercial office buildings will misclassify MHP assets, typically in ways that are too conservative (missing legitimate reclassifications) but sometimes in ways that are too aggressive (claiming reclassifications the IRS would disallow).

Questions to Ask Before Hiring a Cost Segregation Engineer

These are the specific questions you should ask any firm you are considering. The answers will quickly separate qualified professionals from those who will produce a substandard study.

How many mobile home park cost segregation studies have you performed? Ask for a specific number and ask whether they can provide references from MHP clients. Generic commercial experience is not a substitute for MHP-specific experience. The asset mix in an MHP — particularly the lot rent / POH split, the utility infrastructure, and land improvements — requires familiarity with how parks are built and valued.

Will you perform an on-site inspection? The IRS ATG states that a site visit is generally required for a credible study. Desktop studies — conducted entirely from paper documents and photos — are less defensible under audit and typically produce less accurate results. If a firm is not proposing to visit the property, ask why and evaluate their justification carefully. Some smaller, lower-complexity properties may support a desktop approach, but this is an exception, not a standard.

What is your fee structure? This question is critical. We address it in detail in the section on contingency fees below.

What documentation will the final report include? A defensible cost segregation study produces a detailed written report that includes the methodology used, the specific assets identified and their classifications, the cost basis allocated to each category, a description of the engineering analysis, and citations to relevant IRS guidance and court cases. Ask to see a sample report. If the firm cannot or will not provide one, move on.

How does the study handle park-owned homes? This is an MHP-specific test question. POHs are typically classified as 5-year personal property — they don’t need to be reclassified by the study, but they need to be correctly documented so they are not accidentally bundled with 15-year land improvements or 27.5-year structures. An engineer who doesn’t understand this distinction lacks the MHP-specific knowledge you need.

How do you handle utility infrastructure? Water and sewer lines, electrical pedestals, gas distribution — the classification of below-grade utility infrastructure in a mobile home park is an area where engineers can differ significantly. The correct classification depends on the nature of the connections, the construction method, and applicable IRS guidance. An MHP-experienced engineer will have a considered position and be able to explain their reasoning.

Red Flags: When to Walk Away

Some practices in the cost segregation industry are genuinely problematic. Here are the clearest red flags:

Contingency fee arrangements. A contingency fee means the engineer charges a percentage of the tax savings generated by the study. The IRS has expressed concern about contingency fee arrangements in cost segregation specifically because they create an incentive to over-classify assets into shorter-life categories. If your engineer’s fee depends on how large the tax deductions are, their independence is compromised. Look for flat-fee or fixed-range pricing based on property complexity.

No site visit for a significant property. If you own a park with substantial improvements and the engineer proposes to complete the study from your closing documents and a few photos, the methodology does not meet the standard the IRS ATG describes. This study will be more vulnerable under audit.

No MHP-specific experience. Generic commercial real estate experience is insufficient. If the engineer cannot name specific MHP asset categories, discuss how POHs are classified, or describe how they handle utility pedestal and infrastructure analysis, they lack the specialized knowledge needed.

Promises of specific dollar amounts before seeing the property. A qualified engineer will give you a range estimate based on general property parameters. Anyone who tells you exactly how much depreciation they will find before conducting any analysis is telling you what you want to hear, not what the property actually supports.

Reluctance to share a sample report. A study you cannot defend is a liability. If the firm won’t show you what a completed report looks like, you have no basis for evaluating quality.

How the Engineer and Your Tax Advisor Work Together

The cost segregation study and your tax return are two separate deliverables that must be carefully coordinated. This coordination is one of the core functions of an MHP-specialized tax advisor.

Your tax advisor initiates the process by assessing whether a study makes sense given your income level, holding period, improvement-to-land ratio, and passive activity profile. If the study is appropriate, your advisor provides the engineer with the relevant acquisition documents — closing statement, purchase price allocation, prior depreciation schedules, and any available cost records for improvements.

The engineer performs the physical and document review, produces the study, and delivers the asset schedule — a detailed breakdown showing each identified component, its classification, its cost basis, and its assigned MACRS life. This schedule is what your tax advisor needs to populate the depreciation schedule on your return.

When the study involves a lookback analysis (for a park you have already owned for years), your advisor also prepares Form 3115 to implement the change in accounting method and handles the Section 481(a) catch-up adjustment. This is a procedural step that requires specific tax expertise beyond what the engineer provides.

The engineer defends the engineering analysis. Your tax advisor defends the tax treatment. They are distinct but complementary roles. A firm that claims to provide everything under one roof should be evaluated carefully — the question is whether they have genuine engineering depth and genuine tax depth, not just one or the other.

What It Costs and Whether It’s Worth It

Qualified cost segregation studies are not cheap. Fees vary based on property size, complexity, the mix of asset types, and whether a site visit is required. Ballpark ranges exist but vary widely — a credible firm will provide a fixed or fixed-range quote after reviewing your property information.

The relevant question is not whether the study costs money. It is whether the present-value benefit of the accelerated depreciation exceeds the study cost, net of the time-value of the deferred tax liability and the recapture exposure at sale. Your MHP accountant should model this before you hire the engineer.

For small parks — say, under a certain improvement-value threshold — the study cost may consume most or all of the tax savings, making the exercise marginal or negative. Our guide on when cost segregation doesn’t make sense for an MHP addresses these scenarios in detail.

For larger parks with substantial improvement values, the economics are typically clear and favorable — provided the study is conducted properly, the deductions are usable, and the holding period is sufficient. See our comparison of straight-line vs cost segregation depreciation for the full framework.

Once you understand the recapture implications of taking accelerated depreciation, you are better positioned to evaluate the full cost-benefit. Our post on cost segregation recapture at sale covers Section 1245 and 1250 treatment in detail.

Frequently Asked Questions

Disclaimer: This post is for educational purposes only and does not constitute tax, legal, or financial advice. Tax laws change and individual circumstances vary. Consult a qualified tax professional before making any decisions based on information in this article. The MHP Accountant® is an enrolled agent firm; services do not include legal advice.