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Homes with Casitas & Guest Houses in Smithfield, Utah
Smithfield sits at the north end of Cache Valley, about 10 minutes from Logan and a straight shot up Highway 91 toward the Idaho border. It's a small Utah town where multi-generational living is genuinely common — Aggie students at USU, parents helping with grandkids, returning missionaries, and farm families who've been here four generations all create real demand for separate living quarters. Casitas and detached guest houses in Smithfield tend to show up on larger lots east of Main Street toward the foothills, on older agricultural parcels along 200 East and 400 North, and in newer builds in the Birch Creek and Cherry Creek subdivisions where lot sizes still allow an accessory structure.
Because Smithfield falls under Cache County zoning plus the city's own accessory dwelling rules, what counts as a legal casita varies — some are permitted ADUs with their own kitchen and utility meter, others are mother-in-law setups sharing the main home's systems, and a few are converted shops or barns. That distinction matters for financing, rental income, and resale, so it's worth confirming on every property. Winters here run cold (single digits aren't unusual in January) and summers are dry and mild compared to southern Utah, which means insulation quality and heat source on a detached unit are practical considerations, not afterthoughts. Browse the active Smithfield listings with casitas and guest houses below to see what's currently available.
May 2026 · Smithfield market
Live from the Utah MLS — what's actually happening in Smithfield right now.
Median sale
$377,500
20 closed in May 2026
Median DOM
20 days
listing → contract
Sale-to-list
97.9%
of final list price
Unsold inventory
91
active + pending
1 matching · page 1 of 1
Active listings
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Common questions
About homes with casitas & guest houses in Smithfield.
Are detached casitas legal as rentals in Smithfield? ▾
Smithfield allows accessory dwelling units under specific zoning conditions, and rules differ between internal ADUs and detached structures. Short-term rentals (under 30 days) face tighter restrictions than long-term tenants. Always verify the specific property's permit status with Smithfield City before assuming rental income.
What's the price difference between a Smithfield home with a casita versus without? ▾
A legal, finished detached guest house typically adds $60,000 to $150,000 to a comparable Smithfield home, depending on square footage, whether it has a full kitchen, and lot size. Unpermitted mother-in-law setups add less because lenders and appraisers can't credit them the same way.
Why are casitas more common in Smithfield than in some other Cache Valley towns? ▾
Lot sizes here historically run larger than in Logan or North Logan because much of Smithfield developed out of working farmland. That extra ground, combined with a culture of extended family living and proximity to USU, has made guest houses and casitas a practical addition for decades.
Can I finance a home with a casita using a conventional loan? ▾
Yes, as long as the property appraises as a single-family residence with an accessory structure. If the casita has its own address, separate utilities, and is rented out, some lenders may classify it as a 2-unit property, which changes loan terms. FHA and VA both allow ADUs with documentation.
Do Smithfield casitas typically have their own kitchens? ▾
It varies. Permitted ADUs generally include a full kitchen, while older mother-in-law additions often have just a kitchenette or share the main home's kitchen. Listings should specify, but it's worth asking the listing agent directly since this affects both use and value.
What should I check on a detached guest house during inspection? ▾
Focus on the heat source (many older detached units rely on baseboard electric, which is expensive in Smithfield winters), insulation, separate water shutoffs, electrical panel capacity, and whether the structure was permitted. A licensed inspector familiar with Cache County builds will flag issues a general checklist might miss.