KC Krew designs and builds detached casitas, guest houses, and accessory dwelling units across Scottsdale, Paradise Valley, Phoenix, and the East Valley. One licensed design-build team handles the plans, the engineering, the city permit, the HOA submittal, and the construction.
Most of the casita, ADU, and guest house work in the Valley falls apart in the same two places: a plan drawn without knowing what the lot will legally allow, and a budget set before anyone checked how far the utilities have to run. We are a design-build general contractor, so both of those questions get answered by the same team that will eventually pour the footings.
We build detached casitas, guest homes with full kitchens, attached guest suites, and permitted accessory dwelling units for rental use. Some clients come to us with a rendering from an architect and need a builder who will price it honestly. Others start with nothing but a corner of the backyard and a reason. Either way the first conversation is the same: what your zoning district allows, where the structure can physically sit, and what it costs to get there.
KC Krew is owner-led and based in Scottsdale. The same people who walk your property during discovery are the people managing your build. That continuity is the whole argument for hiring a design-build contractor instead of assembling a designer, an engineer, a permit expediter, and a builder who all meet for the first time at plan review.
The best casitas don't feel like an addition. They feel like they were always meant to be there. Thoughtful planning early on has the greatest impact on both cost and long-term value.
What we build
A freestanding structure on your lot, sized and sited around setbacks, lot coverage, and how the main house already uses the yard. This is the most common casita we build and the version that gives you the most flexibility later, because it can be finished as a guest suite now and converted to a full ADU when the utilities are stubbed for it from day one.
Once a detached structure has a kitchen, a bathroom, and a sleeping area, it stops being a guest room and becomes an independent dwelling. That changes the plan review, the utility sizing, and often the foundation, which is why we settle the kitchen question during design rather than midway through framing.
If the plan is long-term rental, we design to the accessory dwelling standards your municipality applies, plan for separate entry and parking where required, and discuss whether a separate meter makes sense for your situation. Short-term rental rules vary by city and by HOA, so we confirm those before you budget around them.
Not every property has room for a detached building. An attached suite with its own entrance, bath, and living area adds the same functional separation inside the existing footprint or as a structural addition, and it is generally the faster and less expensive path when the lot is tight.
Existing covered square footage can become guest space when the structure, slab, and lot will support it. We build these regularly, and we will tell you up front when a scrape-and-rebuild in the same footprint produces a better building for less money than saving a slab that was never engineered to carry walls.
A poolside cabana with a bath, a detached office away from the house, or a studio with real light and insulation. These are smaller-footprint builds, but they still need engineering, permits, and proper utilities, and they benefit from the same pre-construction planning as a full guest house.
Converting existing covered parking is its own project type with its own structural rules. If that is your starting point, read our carport conversion page before you budget.
Terminology
These three words get used interchangeably in Arizona, but only one of them has a legal definition, and the difference decides how your project is permitted.
The regional word for a small guest structure, usually detached. It is a description, not a legal classification. A casita can be a single room with a bathroom, or it can meet the full definition of an ADU. What it is allowed to contain depends on your zoning district.
A legally recognized second dwelling on the same lot as the main home, with its own kitchen, bathroom, and sleeping area. ADUs are governed by municipal ordinance, which sets size limits, setbacks, height, and in some cases parking or owner-occupancy conditions. Every ADU is a casita; not every casita is an ADU.
Used interchangeably with casita in the Phoenix market. In practice, homeowners say guest house when they mean a fully finished unit intended for extended stays, which usually means it needs to be built as an ADU to be legal for that use.
Karla walks through how we approach casita and guest house projects in the Valley.
Approvals
A new detached structure requires a building permit from the city or town with jurisdiction over your parcel. The submittal typically includes a site plan, foundation and framing plans with a structural engineer's stamp, electrical, plumbing, and an energy-code path for conditioned space. Arizona has adopted statewide requirements around accessory dwellings in recent years, but implementation still happens at the municipal level, so the specifics come from your city's current ordinance rather than a single statewide rulebook.
These three numbers usually determine what is possible before design begins. Setbacks control how close the structure can sit to property lines, lot coverage caps the total footprint of all structures on the parcel, and height limits affect roof form and whether a second story is viable at all. They differ by zoning district, not just by city, and on hillside or environmentally sensitive parcels additional standards apply.
Water, sewer, gas, and electrical have to reach a structure that never had them. Whether the casita shares the main home's meter or gets its own depends on the utility, the intended use, and in some cases the municipality. On properties served by septic rather than city sewer, adding a dwelling unit often requires the existing system to be evaluated and sometimes expanded, which is a real cost line and needs to be identified during pre-construction, not during framing.
Across most of Scottsdale, Paradise Valley, and the master-planned communities in the north Valley, an HOA architectural committee reviews elevations, materials, colors, and rooflines, and some CC&Rs restrict accessory dwellings or their use outright. HOA approval is a separate track from the city permit, and in our experience it is more often the schedule driver than plan review. We submit both in parallel.
Scottsdale, Phoenix, Paradise Valley, Tempe, and Mesa each issue their own permits and apply their own zoning standards, and their accessory dwelling rules are not identical. Paradise Valley in particular applies its own guest house standards on large lots, and north Scottsdale adds hillside and environmentally sensitive lands review on many parcels. We confirm current code and zoning for your specific address during pre-construction rather than assuming what applied to the last project still applies to yours.
Rules differ by municipality, zoning district, and parcel, and they change. Nothing here is a substitute for the zoning research we run on your specific address during pre-construction. For what happens when work skips this step, see unpermitted work in Arizona.
Investment
Most of the casitas and guest houses we build land between $120,000 and $450,000 or more. These are planning ranges for this market, not quotes. Where a project lands depends on the lot, the scope, and the finish level.
$120,000 – $200,000
A compact detached structure with a bathroom and a kitchenette, standard finishes, and utilities run from the main house. Typically the right fit for a guest suite, home office, or studio.
$200,000 – $320,000
A separate bedroom, full bath, living area, and full kitchen, built to dwelling standards with its own HVAC. This is the tier most multi-generational and rental projects land in.
$320,000 – $450,000+
Larger footprint, elevated finishes matched to the main house, custom glass and millwork, and site work such as grading, hardscape, or utility extensions across the property.
We wrote a full cost breakdown separately. If you want line-item detail before talking to anyone, read how much a casita costs in Arizona, then come back here when you are ready to price your own lot. Two real examples worth reading alongside it: inside a $400K Scottsdale casita build and whether a five-bedroom casita can be built for $50K.
Process
Added together, the phases below put most casita projects at roughly six to twelve months. Permitting and HOA review are the variables; construction is the predictable part.
We walk the property, confirm zoning district, setbacks, lot coverage, and utility locations, and establish whether what you want is actually buildable on your parcel. You get a realistic budget range before you spend money on drawings.
Architectural plans, structural coordination, mechanical, electrical, and plumbing layouts, and interior selections developed together. Because the builders sit in the design meetings, the plan you approve is one we already know how to build at the price we quoted.
We submit to the city and, where applicable, to the HOA in parallel, respond to plan review comments, finalize the schedule and subcontractor scopes, and lock the construction budget before mobilizing.
Site work, foundation, framing, utilities, envelope, finishes, inspections, and a final walkthrough with a punch list we close out. One project manager and one point of contact throughout.
Why KC Krew
Design, engineering coordination, permitting, and construction sit with one team. There is no gap between the person who drew it and the person who has to build it, which is where most casita budgets break.
We put a real number in front of you before design fees, based on your actual lot and scope rather than a per-square-foot average. If the project does not pencil, you find out first, not after plans are paid for.
We prepare the submittal, respond to plan review, and run HOA architectural approval in parallel. You are not the one chasing comments.
Owner-led, with a single project manager from first walkthrough to final walkthrough. You are not re-explaining your project to a new person each phase.
Custom homes, additions, renovations, and detached structures throughout Scottsdale, Paradise Valley, Arcadia, Phoenix, and the East Valley.
Building in our home city? Our Scottsdale casita, ADU and guest house page covers city permitting, HOA architectural review, hillside parcels, and site logistics specific to Scottsdale properties.
Building bigger than a guest house? We also handle ground-up custom homes and structural home additions.
Who this is for
Space for parents or adult children with real independence and a short walk between front doors.
Visitors get their own bathroom, entry, and schedule, and so do you.
A permitted, legally separate dwelling built to the accessory dwelling standards your municipality applies.
Single-level, step-free layouts with wider doorways and accessible bathrooms designed in from the start.
Actual separation from the house, with the insulation, power, and daylight a workday requires.
A detached space that can take equipment, sound, and its own climate control.
Questions
Areas we serve
Our home base. Detached casitas and ADUs across central, south, and north Scottsdale, including parcels under hillside review.
View Scottsdale pageLarge-lot guest houses designed around the town's own guest house standards and view considerations.
View Paradise Valley pageInfill casitas and ADUs in Arcadia, Biltmore, and the central historic districts.
View Phoenix pageDetached guest structures on desert acreage, including septic and utility planning.
View Rio Verde pageWe also build guest houses and accessory dwellings in Tempe, Mesa, Arcadia, Cave Creek, and Fountain Hills, plus Carefree and the surrounding Phoenix metro.
Tell us where the property is and what you have in mind. We will come out, check zoning and setbacks, and give you a real budget range before you spend anything on drawings.
So we know what to call you.
Prefer to talk it through? (480) 226-2978 or use our contact page.
