Before you buy a mobile home park, you have to understand the numbers. That process — working through the income, expenses, and overall return potential of a deal — is called underwriting. It sounds technical, but at its core, mobile home park underwriting is just about asking: does this deal make financial sense?

This guide walks you through the fundamentals of how to analyze a mobile home park investment, from the top-line revenue down to what you can actually expect to earn. Whether you’re a first-time buyer or considering passive exposure through a mobile home park investment, understanding how deals get analyzed will make you a sharper evaluator.

What Is Mobile Home Park Underwriting?

Underwriting is the process of analyzing a real estate deal to determine whether the risk-adjusted return justifies the purchase price. For mobile home parks, underwriting involves:

• Verifying all sources of income
• Stress-testing the expense assumptions
• Calculating net operating income (NOI)
• Determining an appropriate cap rate for the market
• Arriving at a value — and deciding whether the asking price is reasonable

Good underwriting is the difference between buying a deal that performs and buying a problem. Let’s break it down step by step.

Step 1: Build Your Income Schedule

Start with the revenue side. For most mobile home parks, income comes from three sources:

Lot Rent (the Primary Driver)

Lot rent is the rent that residents pay monthly to keep their home on your land. It’s the most stable and valuable income stream because residents own their homes — moving them is expensive, disruptive, and rarely worth it. Multiply the number of occupied lots by the monthly lot rent to get your gross lot rent income.

Example: 80 occupied lots x $350/month = $28,000/month or $336,000/year in gross lot rent.

Park-Owned Homes (POH) Rent

Some mobile home parks own homes in addition to the land. These generate higher gross rents but also higher expenses (maintenance, vacancy, management). Most experienced operators prefer tenant-owned homes because it simplifies operations significantly.

Ancillary Income

This includes utility pass-throughs (water, sewer, trash), storage units, laundry facilities, or late fees. Ancillary income can add meaningfully to NOI, but don’t rely on it as a core thesis. Verify it with bank statements, not just the seller’s rent roll.

Step 2: Underwrite Vacancy and Credit Loss

No mobile home park runs at 100% occupancy all the time. Apply a vacancy rate based on the park’s history and your market research. A stabilized park in a strong market might underwrite at 5-8% vacancy. A value-add park with significant vacant lots might be at 20-40%.

Subtract vacancy and any expected credit loss (non-paying residents) from your gross income to get your Effective Gross Income (EGI).

Step 3: Stress-Test the Expenses

This is where most amateur underwriters get burned. Sellers always present the best-case expense picture. Your job is to pressure-test every line item.

Typical mobile home park operating expenses include:

• Property taxes — verify with county; can increase after reassessment post-sale
• Insurance — get your own quote, not the seller’s number
• Property management — typically 8-12% of gross income; budget this even if you plan to self-manage
• Utilities — water, sewer, electric for common areas; varies dramatically based on utility structure
• Maintenance and repairs — roads, signage, common area landscaping, septic (if applicable)
• Administration — bookkeeping, software, legal, accounting
• Capital expenditures reserve — set aside a percentage of income for future cap-ex needs

A key rule: if a park’s reported expenses seem too low compared to revenue (say, under 30% expense ratio), probe hard. Stabilized mobile home parks with city utilities typically run 35-50% expense ratios. Parks with private utilities or significant park-owned homes can run 55-65%.

Subtract total operating expenses from EGI to get your Net Operating Income (NOI).

Step 4: Calculate NOI and Apply a Cap Rate

Net operating income is the engine of mobile home park valuation. Once you have a reliable NOI number, you apply a capitalization rate (cap rate) to determine value.

The formula is simple:

Value = NOI / Cap Rate

So if a park generates $200,000 in NOI and the market cap rate is 6.5%, the implied value is approximately $3.08 million.

Cap rates in mobile home park investing vary by market, park quality, utility structure, and occupancy. In 2026, stabilized parks in strong Southeast and Midwest markets are generally trading in the 5.5-7.5% cap rate range. Rural parks or those with operational issues may trade at 8-10% or higher.

Be careful not to over-rely on the seller’s stated NOI. Build your own NOI from verified income and your own expense assumptions — then apply the cap rate to your number, not theirs.

Step 5: Model the Upside

Strong mobile home park underwriting doesn’t just analyze current cash flow — it models the upside potential. Key value drivers include:

Lot Rent Increases

If market rents are $450/month and the park is charging $300/month, there’s a clear opportunity to close that gap over time. Even modest annual rent increases compound dramatically at scale — an extra $50/month across 80 lots is $48,000 more in annual NOI.

Infill (Filling Vacant Lots)

Vacant lots are the highest-upside play in mobile home park investing. If a park has 100 lots but only 75 occupied, getting 15 more homes in can add significant NOI with minimal incremental expense. Check infrastructure capacity, zoning, and whether the market can support it before modeling aggressively.

Expense Reduction

Converting from master-metered utilities (where the park pays the bill) to individual metering (where tenants pay directly) eliminates utility expense entirely. This alone can add hundreds of thousands in value to the right deal.

Step 6: Stress Test the Deal

Once you’ve built a base-case model, stress test it. What happens if:

• Occupancy drops 10% from current levels?
• Insurance doubles after a tough storm season?
• Interest rates rise by 100 basis points at refinance?
• Lot rent increases stall for two years?

A deal worth buying should still make sense under a realistic downside scenario — not just the optimistic projection.

What Makes Mobile Home Park Underwriting Different

Compared to apartments or commercial real estate, mobile home parks have a few unique underwriting considerations:

• Land value is the primary asset — not the structures. Residents own their homes; you own the land beneath them.
• High resident stickiness — moving a manufactured home costs $5,000-$15,000 or more. This limits turnover risk significantly.
• Utility infrastructure matters enormously — city water and sewer is the gold standard. Private utilities (wells, septic, lagoons) add operational complexity and risk.
• Park-owned homes require separate modeling — they look like revenue but carry costs that can erode returns if not managed carefully.

If you want to go deeper on the operational side of evaluating a deal, our mobile home park due diligence checklist covers 25 specific things to verify before you close. And if you’re just getting started on sizing a deal, check out our breakdown of how much money you actually need to invest in a mobile home park.

Final Thoughts: Underwriting Is a Skill, Not a Formula

The mechanics of mobile home park underwriting are learnable in a few hours. The judgment — knowing which assumptions to trust, which risks to price in, and when to walk away — takes time and repetition to develop.

Start with conservative assumptions. Build your own expense estimates rather than accepting the seller’s trailing 12-month financials at face value. Model the upside, but don’t buy a deal on hope. And always stress test before you sign.

The best mobile home park investors aren’t the ones who find the most deals — they’re the ones who know how to say no to the bad ones.

If you’re interested in learning more about mobile home park investing, reach out and we’ll set up a call.