Casita and ADU Builder
A second home,
on the same lot.
Casitas and accessory dwelling units are some of the most useful square footage you can build in Southern Utah: room for guests and parents, a quiet studio, or rental income where the rules allow it. We design and build them to the same standard as the main house, whether they are part of a new custom build or added to a lot you already own.
What People Build
One small building, many uses.
A casita earns its place because it does more than one job over the years. Here is how Southern Utah owners use the space.
Guest casita
A private suite for visiting family and friends, the most common request in St. George second-home territory. Its own entrance, bath, and often a kitchenette.
Multigenerational living
A self-contained unit for aging parents or adult children: single-level access, a full kitchen, and enough separation that everyone keeps their own life.
Rental or nightly income
Where zoning allows it, an ADU can offset your mortgage. We design to the local rules first, because what is permitted varies by city and HOA across Southern Utah.
Studio or home office
A detached, quiet workspace away from the main house, built to the same standard so it holds its value as more than a shed.
The Honest Part
The rules decide what is possible
The hard part of an ADU is rarely the construction. It is the zoning, the HOA, and the utility capacity, and those vary block by block in Southern Utah.
Some cities welcome detached ADUs and nightly rental. Others limit you to an attached unit, cap the size, or require the owner to live on site. The same is true of HOAs, which can be stricter than the city. We start every casita with a feasibility check against your exact parcel so the design fits what is actually allowed, not what we wish were allowed. If your lot cannot support the unit you want, we will tell you before you spend on drawings.
Building the main house too? See how a casita folds into a full custom build, or run the cost estimator to size the budget.
- Licensed Utah GC#14205355-5501
- Insured and BondedCoverage on every build
- 2-Year Workmanship WarrantyOn every Casteca home
- One Accountable Project LeadFrom first walk to keys
- Transparent Line-Item BudgetsNothing buried in the total
Casita and ADU questions
- What does it cost to build a casita or ADU in Southern Utah?
- Casitas and ADUs cost more per square foot than the main house because a small footprint still needs its own kitchen, bath, HVAC, and connections. A finished 600 square foot detached ADU at our Premium level typically runs around $230,000 in build cost, before site conditions and utility runs. We give you a line-item budget for your specific lot, not a guess.
- Can you add an ADU to a home or lot I already own?
- Yes. We build casitas and ADUs both as part of a new custom home and as a standalone addition to property you already own. The first step is a feasibility check: setbacks, the existing utility capacity, and what your city and HOA allow.
- Are ADUs even allowed where I live?
- It depends on the city, the zone, and your HOA, and the rules in Southern Utah have been changing. Some areas allow detached ADUs and nightly rental, others restrict to attached units or owner-occupancy. We confirm exactly what your parcel permits before we design anything.
- Attached or detached, which is better?
- Attached casitas share a wall and utility runs, so they cost less and build faster. Detached units give full privacy and, where zoning allows, the best rental potential. We will walk you through the tradeoff for your lot and your goal.
Find out what your lot allows.
Tell us the address and what you want the casita to do. We will check the rules and come back with an honest feasibility read and a budget.