Live Smithfield listings, filtered
Homes with an ADU or casita in Smithfield.
Smithfield listings with an accessory dwelling unit, whether that is a basement apartment, a detached casita, or an attached mother-in-law suite, fed straight from the MLS and sorted newest first, with a clear read on what makes one legal here and what to verify before you write an offer.
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- Smithfield, UT
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Want it narrower? Tell me your exact spec.
Newest first
The newest ADU and casita listings.
Fed straight from the local MLS and filtered to homes that note an accessory dwelling unit, whether that is a basement apartment, a detached casita, or an attached mother-in-law suite. New Smithfield listings appear here as they list, and sold homes drop off. The read on what makes one legal is just below.
No ADU or casita listings to show right now. Smithfield's deep frost line makes full basements standard, so an accessory dwelling here usually takes the shape of a basement apartment on the historic Main Street grid or the older split-entry stock, though an attached suite or a detached casita can turn up on the larger bench and farm-edge parcels too. Open the map search to run this filter live, or browse every Smithfield listing. Prefer a shortlist? Tell me what you are after.
Buying here
Sort permitted from finished before you tour.
A second kitchen, a private entrance, or a detached structure do not make an accessory dwelling legal on their own, so the real question is whether the unit is permitted with Smithfield City and has proper egress, not just whether it exists. Tell me what setup you need and I will have the Smithfield-area partner agent I work with pull the permit history on any home before you tour.
Selling here
Own a Smithfield home with a documented accessory dwelling?
Buyers on this page want a basement apartment, an attached suite, or a detached casita with the paperwork to back it up, permitted, with real egress. List it with the Smithfield-area partner agent I connect you with and put it in front of that exact search.
Listing information comes from the local MLS and is deemed reliable but not guaranteed.
The local read
What an accessory dwelling really means in Smithfield.
An accessory dwelling is a property feature, not a promise. On a Smithfield listing it means a secondary living space that can function on its own: a second kitchen, its own bathroom, a separate exterior entrance, and sometimes a separate utility meter. The words move around. A basement apartment is a lower level built out that way, a casita is usually a detached unit set apart from the house, and a mother-in-law suite is usually an attached apartment on the main or upper floor. The search shows up for two honest reasons, multigenerational living under one roof and a rentable suite where the unit is legal, and both turn on the same homework, which is whether the space is actually permitted with Smithfield City.
Smithfield is good ground for this search, and the form it mostly takes here is the basement apartment. Cache Valley winters are cold and the frost line is deep, so foundations go down and full basements are the regional norm, on both the established stock and the post-2000 subdivisions that carried the city's recent growth. The older homes around the historic Main Street grid and the older, established-block stock sit over basements that have often been finished and refinished over the decades, and that is exactly the kind of full basement these basement apartment conversions describe, with the split-entry layouts in particular lending themselves to a private grade-level door. An attached mother-in-law suite is more likely to turn up in the larger newer plans on the east-side bench and the west side toward the valley floor, where a newer build is more likely to have a tall lower level or main-floor room built for a second household. A fully detached casita is the rarest shape here, since it takes a lot with room for a second structure, so the farm-edge and acreage parcels are the natural place to find one, and it is a find rather than an expectation.
The east-side bench adds a second, better path to a separate entrance. Where the ground climbs toward Smithfield Canyon and the Bear River Range, a lower level can step out to grade as a daylight or walkout basement, with full-size windows and a real door instead of a dark stairwell. That makes a natural second front door, which is the whole point of a separate suite, and it is one reason the bench is worth watching for this search even though the older grid holds more of the existing units. Logan and Utah State University sit a short drive south, and that proximity factors into rental demand for a legal accessory unit as much as multigenerational living does.
Here is the part that matters more than the photos. A finished basement is not the same as a legal apartment, and neither is a converted room over the garage or a detached structure out back. A second kitchen and an outside door do not make a unit conforming on their own, and a great many existing accessory units in older Utah housing were finished over the years without permits or were built before today's rules. That is not a reason to walk away, but it is the reason to verify rather than assume. I will not quote you a rent number or a payment number on a page like this, because what a unit could earn depends on its legal status and rules that change, and a non-conforming unit cannot be counted on at all. What I can do is point you at the right stock: the older-grid homes and the larger newer plans are the natural hunting ground, so the single-story page is a useful next stop, and the larger no-HOA lots on the no-HOA page often carry the deepest basements and the room for a separate entrance. If you only want the extra square footage and not a second kitchen, the homes with a basement page is the wider search, a different intent than this one. Earlier in the process than show me listings? Start with the Smithfield guide, and when a home below reads right, that is the moment to reach out.
What counts as an accessory dwelling
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The form it takes: in Smithfield most of these are basement apartments, since full basements are the norm across the historic grid and older split-entry stock. Attached mother-in-law suites turn up in the bigger newer bench and west-side plans, and a detached casita is rare, so read the listing for where the space actually sits.
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Second kitchen: a full or kitchenette setup is the core marker. A finished basement or a spare suite with no kitchen is just extra space, not a separate unit, so read the listing for the actual layout.
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Separate entrance: the second front door of the page title. A private exterior entry, often a walk-down or a side door, is what makes the space usable on its own, and on the east-side bench a daylight or walkout grade can give you a real one at the back.
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Separate egress: every sleeping room below grade needs a code-sized window well or a door to the outside. This is a safety item and a legality item at once, and it is the first thing to confirm in person, not from the photos.
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Separate utilities: some units have their own gas or electric meter, or at least split HVAC. It is a convenience, not proof of legality, so note it but do not read it as a permit.
The local map
Where the accessory units actually are.
Homes with a second living space turn up across Smithfield, but the forms concentrate in a few patterns, and the basement apartment is by far the dominant one. Here is where to look, sorted by the city's geographic settings, with the due-diligence note attached to each.
The historic Main Street core
The platted grid around Main and Center carries the oldest homes on established blocks, many over full basements with mature trees and city services, and Summit Creek runs through this core. This is the most likely place to find a real basement apartment, and also the most likely place to find one finished over the years without a permit, so it is where verification matters most, and worth a look at how the creek and any low ground move water near the foundation. Inspect the bones, not the charm.
The older, established-block stock
The older split-entry homes scattered through the established blocks often have large finished basements, and the split-entry layout in particular can put a private grade-level door just a half-flight down. A separate entrance is more natural here than in a true two-story, so the layout lends itself to a conversion. Confirm the egress windows on the bedrooms below.
The east-side bench and canyon edge
The newer subdivisions climbing the bench toward Smithfield Canyon and Canyon Road sit on higher ground with close Bear River Range views and generally younger systems. A sloped bench lot can give the lower level a walkout to grade, which is the ideal separate entrance for an attached suite, and a newer full basement is more likely to have been finished with permits, but you still verify the unit's status.
The west-side growth and valley floor
The newer development extending west toward the valley floor and farmland brings standard newer subdivision product on the flat, often with full basements ready to finish or already built out, and the bigger newer plans among them can carry an attached mother-in-law suite too. Younger construction tends to mean cleaner permit records, but a second kitchen and a separate door still need to be confirmed as legal, not just present.
Walkout and daylight lots
On the sloped bench and the right grade, a lower level can open to grade with full windows and a real door, which is the ideal setup for a separate suite that lives like its own floor rather than a dark basement. These are less common than a fully below-grade basement but are worth watching for, since they make the accessory unit comfortable and well-lit.
The farm-edge and acreage parcels
Out at the city's farm fringe, the larger lots sometimes carry room for a fully detached casita alongside the main house, the rarest form of accessory dwelling in Smithfield, along with the space to spread out generally. These edges also run their own homework on wells, septic, and Smithfield Irrigation Company water shares, so the acreage page is the companion read on the rural diligence.
Before you tour: what to actually check
Is it permitted: ask the listing agent for the permit history and confirm the unit's status and the parcel's zoning with Smithfield City. A second kitchen and a side door do not make a unit legal on their own, and what is allowed depends on the parcel.
Egress on every bedroom: each sleeping room below grade needs a code-sized egress window and well, or a door to the outside. Look at the actual window wells, not just the listing photos, and note where a walkout door gives you the cleanest exit.
Conforming vs. existing: many older accessory units are non-conforming, finished before today's rules or without permits. Understand exactly what you are buying and what can and cannot be relied on.
Attached, detached, or below grade: note which form you are actually looking at, since a basement apartment, an attached suite, and a detached casita each carry their own access. Check whether the kitchen, HVAC, and any meter are genuinely separate, and whether the wiring and gas work for the second kitchen were done to code and inspected.
Ceiling height, light, and the walkout: an older basement can be low and dark. Stand in it. A tall, daylight, or walkout lower level on the bench lives very differently from a short, fully below-grade basement, and the grade out back tells you which one you have.
Water, well, and the rest: on a city-grid home confirm culinary water and sewer, and note the Summit Creek drainage through the historic core; on any farm-edge home check whether it runs on a private well and what Smithfield Irrigation Company shares convey, then date the roof, furnace, and electrical panel on any older home.
Want a real accessory dwelling without the guesswork?
Tell me your budget, the part of Smithfield you like, whether you want a basement apartment, an attached suite, or a detached casita, and whether you need a fully permitted, conforming unit or are open to an existing space you would verify and possibly bring up to code. I will connect you with a trusted Smithfield-area partner agent for the on-the-ground work and stay on the file for the homework and the financing. You get a local who knows which spaces are legal units and which are just finished basements with a door, and a second set of eyes who answers to you.
Selling a Smithfield home with a basement apartment, a casita, or an attached accessory suite? The buyers reading this page want exactly that. List it with the Smithfield-area partner agent I connect you with, and your home gets featured across MovingUtah, on the pages they are already reading.
Quick answers
ADU and casita shopping, answered.
It is a secondary living space that can function on its own, and Smithfield listings use several words for it. The most common form by far is a basement apartment, a lower level built out with a second kitchen, its own bathroom, and a separate exterior entrance. A casita usually means a detached unit set apart from the main house, and a mother-in-law suite usually means an attached accessory apartment on the main or upper level. All of them are property features describing the space, nothing more. The big thing to know is that a second kitchen and an outside door do not make a unit legal on their own, so the real work is confirming whether it is permitted and conforming with Smithfield City and what the specific parcel's zoning allows.
Some are and some are not, which is exactly why you verify rather than assume. An accessory dwelling has to be permitted with Smithfield City to be treated as a separate dwelling, what is allowed depends on the parcel's zoning, and many existing basement apartments and converted suites in older homes were finished over the years without permits or were built before today's rules, so they are non-conforming. That is not a dealbreaker by itself, but you need to know which one you are buying. Confirm the zoning, the permit history, the unit's status, and the egress independently before you rely on it, and I will help line up those checks.
Most often on the historic Main Street grid and the older, established-block homes, where full basements were finished into apartments over the decades and the split-entry layouts lend themselves to a private grade-level door. On the east-side bench toward Smithfield Canyon a sloped or walkout lot can give the lower level a real back door, and an attached suite can turn up in the larger newer plans on the bench and the west side toward the valley floor. A fully detached casita is the rarest form here, since it takes a lot with room for a second structure, so the farm-edge and acreage parcels are the natural place to look for one. The live listings above are the honest count on any given week.
Only where the unit is legal, and that is the whole point of the verification. A permitted, conforming accessory dwelling is a different thing from a non-conforming space that happens to have a kitchen, the rules around accessory dwellings and rentals can change, and what is allowed depends on the parcel's zoning, so this is a question to confirm with Smithfield City for the specific property, not to assume from the listing. Logan and Utah State University sit a short drive south, which is part of why this search comes up, but the legal answer is still parcel by parcel. I will not put a rent figure on a page like this, because it depends entirely on the unit's legal status and the specifics, but I can connect you with a local agent who will get you straight answers on what the city allows.
Egress is a legal, code-sized way out of every below-grade sleeping room, usually an egress window with a window well sized for a person to climb out, or a door to the outside. It is both a safety requirement and a piece of what makes a basement bedroom or apartment count as legal living space. It matters most on the basement units that make up most of this search, and on the east-side bench a walkout or daylight grade can give you a real door, which is the cleanest version of egress. It is the first thing to confirm in person, because a room marketed as a bedroom downstairs is not really one without it, so we check the actual window wells, not just the photos.
Tell me the budget, the part of town, and whether you need a fully permitted suite or are open to an existing space to verify, and I will connect you with a Smithfield-area partner agent and flag matching listings as they go live. Pair that with a conversation about financing so you can move when the right separate-suite home lists, since these are a narrow slice and they do not sit long.