Mother-in-Law Apartments
A private in-law apartment for the family you love close by.
CasaMás Construction designs and builds mother-in-law apartments across Utah, with service available in English and Spanish.
A mother-in-law apartment (in-law suite) is a private, self-contained living space for a parent, adult child, or relative — close to family but with their own entrance, bathroom, and often a kitchenette. It is the multigenerational-living form of an ADU. CasaMás Construction builds these as a finished basement suite, an attached addition, a detached unit, or a garage conversion, and handles design, egress, permitting, and finishes, when allowed by local city rules.
Who it’s for
For families bringing parents closer, supporting adult children, or wanting flexible space that can host relatives now and add value later — privacy and connection without anyone moving away.
What’s included
Attached suite addition
A private suite added onto your home with its own entrance.
Basement in-law apartment
A finished, code-ready lower-level suite with bedroom, bath, and living space.
Detached unit
A standalone backyard unit for maximum privacy, when allowed by local city rules.
Garage-conversion suite
Convert an existing garage into a comfortable in-law suite.
Accessible features
Step-free entries, wider doorways, and safer bathrooms for aging in place.
How your project works
- 1
Free consultation
We listen to your goals and look at your space — in English or Spanish.
- 2
Design & estimate
Clear scope and a written estimate. Monthly payment examples are estimates.
- 3
Permits & build
We handle permitting and construction with licensed, insured, and bonded crews.
- 4
Enjoy your space
More room, more income potential, and more equity in your home.
What affects your cost
Cost depends on the type (attached, basement, detached, or conversion), size, kitchenette/bath plumbing, accessibility features, and finishes. After reviewing your home and goals, we provide a clear, written estimate — no invented numbers, no pressure.
Financing options may be available, subject to approval. Monthly payment examples are estimates.
Where we work
CasaMás builds in-law apartments across Salt Lake, Utah, Davis, Weber, and Tooele counties. In-law/ADU rules vary by city; we help confirm what’s allowed by your local city rules and handle permitting.
- Salt Lake County
- Utah County
- Davis County
- Weber County
- Tooele County
Project photos
Photos coming soon
We’re adding real Utah projects for this service. Ask us for recent examples during your free estimate.
Frequently asked questions
Is a mother-in-law apartment the same as an ADU?
A mother-in-law apartment is a type of accessory dwelling unit (ADU) used for family living — this page focuses on private suites for parents or relatives, while our ADU service covers all ADU types. Rules vary by local city.
Can it have its own kitchen?
It can include a kitchenette or full kitchen where allowed by local city rules. We’ll walk you through what’s possible on your property.
Can I rent it out later?
An in-law apartment can add rental income potential when allowed by local city rules. We don’t guarantee rental income, city approval, or permits.
Can you make it accessible for aging parents?
Yes — step-free entries, wider doorways, and safer bathrooms are common requests we design for aging in place.
Do you offer financing?
Financing options may be available, subject to approval. Monthly payment examples are estimates. Ask us during your free estimate.
Related services
Get your free estimate
No pressure. We'll give you clear options for your project.