Should I buy a house with a basement apartment in Herriman?

Often yes — if it is legal. A basement apartment that is permitted, allowed by the zoning and built with proper egress is one of the most useful features a Herriman house can have. One that is none of those things is a liability wearing a kitchen.

The mother-in-law apartment is a Utah institution. Multigenerational households are common here, adult children stay close, and a lot of buyers run the numbers on a tenant helping with the payment. Herriman’s housing stock — big basements, nearly all of them — makes it the natural place for one. The question is never whether the idea is good. It is whether the specific apartment in the specific house is real.

The three things that decide it

Is it permitted? Ask the city for the permit record on the address. A basement apartment built with permits was inspected — electrical, plumbing, egress, fire separation. One built without them was not, and you are inheriting whatever the previous owner’s brother-in-law did.

Does the zoning allow it? Utah law made it easier for cities to allow internal accessory dwelling units in single-family zones, but cities set the rules, and Herriman has its own. Some zones and some HOAs allow them; some allow them only owner-occupied; some do not. The city planning office answers this in a phone call.

Is the egress legal? A bedroom below grade needs a code-compliant egress window — large enough to climb out of, with a well that meets the dimensions. This is a life-safety item, and an apartment without it is not a legal apartment no matter how nice the finish.

If all three are yes, the apartment is an asset. If any is no, the listing’s description of it is aspirational.

When it is genuinely an asset

A parent or adult child. The most common Utah use, and the one that needs the least paperwork. A separate entrance, a kitchen and a bathroom give two households privacy under one roof. For a family caring for a parent, it can be the difference between staying in the house and not.

Rental income, done legally. A permitted unit in a zone that allows rentals, with the HOA’s blessing, can carry a meaningful share of the payment. Lenders may count some of that income for qualifying if the unit is legal and documented. Your lender will tell you exactly what counts.

Resale. A legal apartment adds real value because the next buyer runs the same numbers you did. An illegal one adds nothing at appraisal and can subtract.

Flexibility over time. The unit that houses a tenant this year can house a returning college student next year and a parent after that.

When it is a liability

Unpermitted. The city can require it to be removed or brought to code at your expense. The appraiser will not count it as living space. Your insurer may decline a claim in it. You may not be able to rent it legally at all.

The HOA prohibits rentals. Many Herriman associations have rental rules — caps, minimum lease terms, owner-occupancy requirements. Read them before you assume income.

The egress is a small window. If the “bedroom” window is too small to climb through, it is not a bedroom and the apartment is not safe.

Shared systems with no separation. One furnace, one water heater, one electrical panel serving both households can work, but it means the tenant’s usage is on your bill and a failure affects both.

You are counting on the rent to afford the house. If the mortgage does not work without a tenant, a vacant month is a crisis. Buy the house you can carry alone; treat the rent as a bonus.

What to check on the specific house

Permit history from Herriman City. Ask for everything on the address, not just the apartment.

The zoning designation and what it allows for accessory units.

The HOA’s rules on rentals and on additional households.

Egress — measure the window and the well. Your inspector will, but you can before you fall for the house.

Separate entrance. A true apartment has its own door. A basement reached only through the main floor is a finished basement with a kitchenette, which is fine, but it is not what a tenant wants.

Fire separation. Permitted apartments generally require rated drywall and specific door assemblies between the units. This is the item unpermitted finishes most often skip.

Parking. Where does a second household park? Many HOAs limit street parking, and a driveway that fits two cars does not fit four.

Utilities. Are they separately metered, and if not, how are they split?

If you plan to rent it: the landlord basics

A legal apartment you intend to lease makes you a landlord, and Utah has rules.

Business license. Many south valley cities require a rental business license for a long-term rental unit. Ask Herriman City what applies to the address.

Fair housing. Federal and Utah fair housing law applies to your basement unit the same as to an apartment complex. You cannot choose tenants on protected characteristics, and the advertising and screening need to be done properly.

The lease and the deposit. Utah has specific rules on security deposits and their return. Use a proper written lease.

Owner-occupancy. Some zoning and some HOAs allow the unit only while the owner lives in the main house. If you ever move out and keep the property, that can change what is legal.

Taxes. Rental income is income. Utah’s primary residence property tax exemption is about how the property is used, and a tenant’s unit inside your primary residence is generally fine — but ask the county rather than assume.

None of this is difficult. All of it is easier to learn before the first tenant than after.

The lending and insurance layer

Tell your lender at pre-approval that the house has an apartment. If it is legal and documented, some or all of the rent may help you qualify; if it is not, it is invisible to the loan and may complicate the appraisal.

Tell your insurer too. A rental unit changes the policy. A tenant in a unit the insurer does not know about is a claim that gets declined.

What I actually see happen

I am Kelsey Earl, a Realtor with Keller Williams South Valley, and basement apartments in Herriman divide cleanly into two kinds.

The first kind was built with permits by an owner who lived upstairs and put family or a tenant below. The paperwork exists, the egress is right, and the buyer gets exactly what the listing promised. These are among the best buys in the south valley for a family that needs the space.

The second kind is a finished basement that someone added a stove to, listed as an “apartment,” and priced accordingly. The buyer pays for income that turns out to be illegal, or for square footage the appraiser will not count, and finds out during due diligence if they are lucky and after closing if they are not.

The difference between the two is one phone call to the city, made before the offer.

What to do next

Before you write on any Herriman house with an apartment, call the city for the permit record and the zoning, read the HOA rules on rentals, and measure the egress window yourself.

Send me the address and I will pull the permit history and the zoning as part of the normal questions, along with what the association says about tenants. It is a short piece of work and far better done before you are attached to the house.