Every week, somewhere in America, a new mobile home park investor closes on what they believe is a solid deal — and discovers in year one that they overpaid by six figures or inherited a capital problem they never saw coming.

After 50+ park acquisitions, we’ve seen the same mistakes repeat across the industry. And the damage is almost always concentrated in one place: utility infrastructure due diligence that got skipped, rushed, or trusted to the wrong source.

Here’s what’s actually happening out there — and how to not be the cautionary tale.

Why Mobile Home Park Due Diligence Is Different (And Why It Trips People Up)

If you’re coming from multifamily or single-family investing, your due diligence instincts are going to fail you in manufactured housing. The asset class looks similar on the surface — you’re buying real property, reviewing rent rolls, modeling NOI — but the infrastructure underneath a mobile home park is categorically different.

You’re responsible for roads. Water mains. Sewer lines. Sometimes septic systems or private wastewater treatment plants. Utility infrastructure that may not have been significantly maintained in 20 years.

And unlike a 200-unit apartment building where a plumbing issue in one unit is contained, a water main failure in a mobile home park affects every resident simultaneously. The repair bills aren’t $10,000. They’re $50,000 to $200,000. And they come out of your cash flow immediately.

Mistake #1: Getting Utility Bills From the Seller

This is the most common, most expensive mistake in mobile home park due diligence. You request utility bills during the inspection period. The seller provides them. You review 12–24 months of history. Everything looks reasonable.

What you don’t know: the seller controls what they give you. Utility invoices are easily doctored. And even an unaltered invoice only tells you what was billed — not what the actual consumption per lot was, whether there are active leaks, or whether the infrastructure is about to fail.

The fix is simple: request utility history directly from the municipality or utility company. Not from the seller — from the source. Ask for 36 months. Most municipalities will provide this with a written authorization from the current owner.

Then do the math: divide total water consumption by number of occupied lots. Industry benchmark is 80–150 gallons per lot per day. If you’re seeing 200+, there are leaks somewhere. Above 250, treat it as a deal-breaker until proven otherwise.

We’ve seen parks where consumption was running over 400 gallons per lot per day. The previous owner was simply absorbing the loss and not disclosing it. The buyer inherited a $120,000 water line repair that wasn’t in the deal economics.

Mistake #2: No Infrastructure Walk

Hiring a general property inspector to check the condition of individual homes is not the same as auditing park infrastructure.

You need a specialist to physically walk your main water lines, inspect the meter vault, assess road condition, evaluate any private utility systems (wells, septic, wastewater treatment), and give you a written assessment with estimated useful life and repair cost ranges.

This costs $3,000–$8,000 depending on park size and infrastructure complexity. It is the best money spent in due diligence, full stop.

On a $2 million park, that’s 0.15–0.4% of purchase price to protect yourself from a potential 5–10% loss. The math is obvious.

Mistake #3: Applying the Cap Rate to the Wrong Income

This one catches investors who have decent real estate fundamentals but don’t understand mobile home park valuation.

If your park has park-owned homes (POHs) — homes that the park owns and rents out — there are two separate income streams: lot rent and home rent.

The correct way to value a manufactured housing community: apply your cap rate to lot rent only. Home rent from park-owned homes carries significantly more management burden, maintenance cost, and vacancy risk. It should be valued separately — and often discounted heavily.

A park showing $600,000 in gross revenue might have $150,000 of that coming from park-owned home rent. If you apply a 7-cap to the full $600K (after expenses), you’re dramatically overpaying versus what the stabilized lot-rent-only value would justify.

We’ve seen investors overpay by $300,000–$500,000 on deals simply by misapplying this one valuation concept.

Mistake #4: Not Verifying Occupancy With Your Own Eyes

A rent roll is a document. A document is only as accurate as the person who created it.

Walk every lot. Look for signs of actual occupancy: vehicles, personal effects, active utility connections. Cross-reference with whatever records you can access.

Red flags: a lot that shows “occupied and paying” on the rent roll but the electricity appears to be off, there’s no vehicle, no outdoor furniture, no mail. That’s likely a ghost lot — the owner may be collecting rent from a fictitious tenant or from a real tenant who moved out and kept paying temporarily to inflate the books before the sale.

We don’t say this to be paranoid. We say it because it happens regularly. Physical verification is non-negotiable.

Mistake #5: Ignoring the Property Tax Reassessment

When you buy a property, the local assessor will often reassess it at the new sale price. This can significantly increase your property tax obligation — and most new investors either forget to account for it or assume the current tax bill will stay flat.

Before closing, contact the local assessor’s office and ask directly: “If this property sells for $X, what is your estimate of the reassessed annual tax obligation?” This is public information and they will tell you.

A $40,000 annual increase in property taxes on a deal underwritten at a 7-cap destroys $571,000 in value. One phone call prevents that.

The Bottom Line

Mobile home park investing is one of the strongest asset classes available. Sticky tenants, affordable housing demand that only grows, and cash flow characteristics that beat most alternatives.

But it punishes sloppy due diligence harder than almost any other asset class, because the problems hide underground — literally — and they’re expensive to fix once you own the park.

Do the work. Request utility bills from the source. Walk the infrastructure. Verify occupancy with your own eyes. Understand the unique valuation dynamics of manufactured housing. And call the assessor before you close.

The investors who do this consistently are the ones who actually build wealth in this space. The ones who don’t are the cautionary tales you hear about on podcasts.

We’ve put together a step-by-step resource that walks through exactly how we evaluate every deal before we buy: the Mobile Home Park Due Diligence Playbook. It covers utility audits, infrastructure inspection, rent roll verification, valuation methodology, and more.

Keel Team has acquired and operated 50+ mobile home parks. We share what we’ve learned because a better-educated investing community is a better market for everyone.

Related Reading

Want to go deeper on mobile home park due diligence and investing fundamentals? These resources from Keel Team cover the key topics every serious investor should know:

• Mobile home park utility considerations — The full breakdown of water, sewer, and private utility risks before you close.
• How to value a mobile home park — Step-by-step guide to calculating NOI, cap rates, and fair market value.
• Lot rent and park-owned homes explained — The two revenue models in mobile home park investing and how they affect your underwriting.