Custom site-built casitas and ADUs across Phoenix, Arizona. Five permit-ready models from 400 to 1,400 square feet, starting at $133,000. Transparent pricing. Expert permitting. ROC Licensed general contractor.
Site-built casitas and ADUs for Phoenix homeowners.
Valley Casita Co. builds custom, site-built casitas and accessory dwelling units across the Phoenix metro. Every structure is built on your lot, to your lot's specific dimensions, permitted through the City of Phoenix or the relevant municipality, and inspected to Arizona's residential building code. We are not a modular company. We are not a kit home company. We build real homes — smaller ones — in your backyard.
Under Arizona HB 2720 (effective January 2025), Phoenix must allow at least one detached ADU on any single-family lot. That law opened the Phoenix backyard home market — and we've built our entire process around making it as straightforward as possible for Phoenix homeowners to take advantage of it.
What "site-built" means for you: Every Valley Casita Co. casita is framed, insulated, plumbed, wired, and finished on your property — not manufactured elsewhere and delivered. It goes on the same foundation type as your primary home, gets the same inspections, and carries the same certificate of occupancy. It adds permanent, appraised value to your property from day one.
Five Models — One for Every Phoenix Lot
From compact to full two-bedroom — permit-ready and priced upfront.
Every model includes architectural drawings, standard City of Phoenix permit fees, foundation, framing, full electrical and plumbing, HVAC, a standard kitchen package, and certificate of occupancy. No hidden additions after you sign.
Seven zip codes across the Phoenix metro — each with its own lot profile, HOA landscape, and rental market.
Google prefers a hyper-specific neighborhood page over a generic city page. So do we. Each neighborhood below has its own guide covering lot sizes, HOA landscape, permit timeline, and rental income estimates specific to that area.
Phoenix-specific facts every homeowner should understand before breaking ground.
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City of Phoenix Permits
Phoenix ADU permit fees run $2,500–$4,200 depending on project scope. Plan check typically takes 4–8 weeks from submission. We prepare and submit all documents — you don't need to visit a permit office.
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Lot & Setback Rules
Phoenix requires a minimum 5-foot rear setback and 3-foot side setback for detached ADUs on most R-1 zoned lots. Lot size, existing structures, and easements all affect placement. We check all of this on the first call.
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HB 2720 — Arizona ADU Law
Arizona's HB 2720 (January 2025) requires Phoenix to allow at least one detached ADU on any single-family lot. Phoenix HOAs cannot prohibit ADUs that comply with state law, though pre-2015 HOA restrictions may still apply.
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Phoenix Rental Market
Phoenix metro small unit rents average $2.00/SF/month (ARMLS September 2026). A 576 SF Casita earns approximately $1,400–$1,800/month long-term. Value added averages $282/SF on permitted ADUs in recent Phoenix sales.
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Historic District Builds
Phoenix historic districts — Willo, Coronado, Garfield, F.Q. Story — require Historic Preservation Office design review in addition to standard permitting. This adds 4–6 weeks. We've completed builds in Willo and manage the full review process.
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Short-Term Rental Rules
Phoenix allows STR use of ADUs on owner-occupied properties. A City of Phoenix STR license is required separately from the ADU building permit. We walk you through both registration processes as part of our build process.
Our Phoenix Build Process
From your first call to your certificate of occupancy — we handle everything.
1
Free Lot & Site Check
We pull your Maricopa County parcel data, plat map, and confirm setbacks, easements, HOA restrictions, and ADU eligibility for your specific property. No cost. One business day.
2
Model Selection & Proposal
Based on your lot and goals, we recommend which models fit and present a fully itemized proposal — every cost, no surprises. We publish our pricing so you know the range before the first conversation.
3
Architectural Drawings & Engineering
We prepare stamped architectural drawings and engineering documents required by the City of Phoenix for permit submission. All plans are designed to pass Phoenix plan check on the first review.
4
City of Phoenix Permitting
We submit your ADU permit application, respond to any plan-check comments, and manage the full City of Phoenix approval process. Typical timeline: 4–8 weeks. Historic district properties: 8–14 weeks.
5
Construction
Site-built construction on your lot — foundation, framing, insulation, rough mechanicals, exterior, and full interior finish. All inspections managed. Timeline: 4–5 months for Studio and Casita models, 5–7 months for Hacienda and Sonoran.
6
Certificate of Occupancy & Keys
Final inspection, certificate of occupancy issued by the City of Phoenix, and handover. Your casita is legal, inspected, and ready to occupy, rent, or list on Airbnb.
The Phoenix casita math — based on real ARMLS data.
Based on ARMLS September 2026 Phoenix metro data, small rental units (400–1,000 SF) rent for a median of $2.00 per square foot per month across the Phoenix metro, with a range of $1.09 to $4.20 depending on neighborhood and finish level. A permitted, site-built ADU adds approximately $282 per square foot in appraised home value on average — meaning a 576 SF Casita adds roughly $162,000 to your property's assessed value on top of the rental income it generates.
For multigenerational households, the comparison to assisted living ($4,500–$6,000/month in the Phoenix metro) makes the build cost of any VCC model recover in under 5 years of avoided care costs — before accounting for the permanent equity added to the property.
Free · Based on ARMLS Sept 2026 Phoenix Metro Data · No email required to run the numbers
Common Questions — Phoenix Casita Builds
A custom site-built casita in Phoenix starts at $133,000 for a 400 SF Studio and goes to $325,000 for a 1,400 SF Sonoran. All base prices include architectural drawings, City of Phoenix permit fees ($2,500–$4,200), foundation, framing, full mechanical systems, standard kitchen package, and certificate of occupancy. See our 2026 Phoenix casita cost guide for a full breakdown.
Yes. All ADUs in Phoenix require a building permit from the City of Phoenix Building Services department. Under HB 2720 (effective January 2025), Phoenix must allow at least one detached ADU on any single-family lot. Valley Casita Co. prepares and submits all permit documentation on your behalf — you don't need to visit a permit office. Learn more in our HB 2720 explainer.
From signed contract to certificate of occupancy, most Phoenix casita builds take 6 to 9 months total. City of Phoenix plan check: 4–8 weeks. Construction: 4–5 months for Studio and Casita models, 5–7 months for Hacienda and Sonoran. Historic district properties (Willo, Coronado, etc.) add 4–6 weeks for Phoenix Historic Preservation Office review.
The City of Phoenix allows detached ADUs up to 1,000 SF on standard lots. On lots above 10,000 SF, larger ADUs may be permitted depending on zoning. Under HB 2720, Phoenix cannot prohibit ADUs that meet state law requirements. We offer five models from 400 to 1,400 SF — our free lot check confirms which models qualify for your specific parcel.
Most Phoenix single-family lots qualify for at least one detached ADU under HB 2720. Eligibility depends on lot size, existing structures, setbacks, HOA restrictions, and historic district status. Our free lot and site check reviews your specific parcel, confirms eligibility, and tells you which models fit — at no cost, in one business day.
We review your specific lot — setbacks, easements, HOA, and utility access — and give you an accurate build cost and ROI estimate in one conversation. Free, no obligation.