From Single-Family Homes to Small Commercial: What Changes?

This month's AZREIA meeting tackles a milestone every growing investor eventually hits: the jump from single-family rentals to small multifamily. It's an exciting move — but insurance-wise, it's not just "the same policy, bigger building." Here's what actually shifts as you climb from a single-family home into the 4- to 8-unit range.

The line falls in the middle of your target range. Most carriers draw the residential/commercial boundary at 1–4 units versus 5+. That means a 4-plex can often still be written on a personal-lines landlord or dwelling fire policy, while a 5- or 8-unit building almost always requires a commercial property and liability form. If you're building a portfolio across that 4–8 unit range, expect to be shopping two different markets, not one.

Rating basis changes. SFH rentals are typically rated per house, based on square footage, age, roof, and construction. Commercial multifamily is rated more like a business: per unit and per total insured value, with underwriters weighing occupancy type, on-site amenities, fire protection class, and even management history. Rates are higher on commercial properties; just know that. Some of that is coverage difference, but also, the risk goes up. When you break it down by door its not usually outrageously different, but it is higher, and many people making the jump aren’t used to that change.

Liability limits step up. A single-family rental carries liability tied to one household. Add units, common hallways, parking lots, and shared mechanicals, and your liability exposure — and the limits lenders require — climbs with it. $1 million per occurrence is often the commercial floor, and umbrella coverage becomes far more common and often necessary. As the owner of a multi-family unit owner you are viewed as rich, regardless of the cash flow on the property, and as such become a target.

Loss of rents gets more complicated. On a SFH, loss of rent is usually a simple add-on covering one tenant. On an 8-plex, a single covered loss (a pipe break, a fire) can knock out several units at once, so business income/loss of rents coverage needs to be sized for a multi-unit outage, not a single check. This coverage matters! If you have a covered loss, and you are out rent, how are you covering the mortgage? That is what loss of rent does.

Underwriting gets more rigorous. Expect questions about sprinklers, fire alarms, roof age and permits, security lighting, and maintenance records — items rarely asked about on a single rental home, but standard on any 5+ unit submission. Updates matter. In the commercial space, the roof, HVAC, plumbing, and electrical need to have been updated in the last 30 years. If not, the carriers will usually drop coverage DRASTICALLY. Both in terms of limits AND perils that are insured. For example, if the plumbing hasn’t been updated in 30 years (i.e., since 1996) on a commercial policy, they will not cover leaky pipes or other water damage. By the way, that is the most frequent type of loss you are likely to see in Arizona.

Valuation and lender requirements tighten. Commercial lenders typically require replacement cost valuation, specific deductible structures, and ordinance-or-law coverage that personal-lines policies often don't include at all.

The takeaway for AZREIA members scaling up this year: start the insurance conversation before you're under contract. A 5-plex bought expecting SFH-style pricing can come as a surprise once it's underwritten commercially — better to know the market and the number ahead of time. Not sure where to start? Contact Gila Insurance Group LLC at gilainsurance.com or 928-428-6440.