Most casita builders in the Phoenix metro don't publish their prices. You fill out a form, wait for a call, and find out what things cost somewhere in the third conversation. We think that's backwards — so here's the full pricing breakdown upfront, including what's in the base price, what costs extra, and how to think about the return on what you build.
Valley Casita Co. builds custom site-built casitas. All numbers below are for site-built construction — not modular, not prefab, not kit homes. If you're comparing quotes, make sure you're comparing the same thing.
The Five Models and What They Cost
| Model | Size | Starting Price | Best For |
|---|---|---|---|
| The Studio | 400 SF | $133,000 | Rental income, guest house, small lots |
| The Casita | 576 SF | $163,000 | Aging parents, long-term rental, guests who stay |
| The Retreat | 720 SF | $199,000 | Multigenerational families, premium rental |
| The Hacienda | 980 SF | $260,000 | Full-time family housing, adult children, high-income rental |
| The Sonoran | 1,400 SF | $325,000 | Multi-room family suite, premium Scottsdale and Phoenix lots |
These are starting prices for standard configurations and finishes. Final price depends on your lot's specific conditions — more on that below.
What's Included in the Base Price
Every Valley Casita Co. base price includes the following. No hidden line items, no surprise additions after you sign.
- Architectural drawings and engineering — stamped plans required by the city for permit submission
- Standard city permit fees — $2,500 to $4,200 in Phoenix, included in your contract price
- Site preparation and foundation — clearing, grading, and concrete slab or stem wall foundation
- 2x6 framing — exterior walls framed to the same standard as the primary home
- Spray foam or batt insulation — meeting Arizona energy code requirements
- Exterior finishes — stucco, paint, and trim to match or complement the primary home
- Roofing — tile or shingle depending on the model and neighborhood
- Windows and exterior doors — standard aluminum frame double-pane windows, entry door with deadbolt
- Full electrical rough-in and trim-out — panel, outlets, switches, fixtures
- Full plumbing rough-in and trim-out — supply lines, drain, water heater
- HVAC system — split system sized for Arizona climate, including ductwork
- Standard kitchen package — cabinets, laminate or quartz countertop, sink, standard appliances (range, refrigerator, dishwasher)
- Bathroom fixtures and tile — vanity, toilet, shower or tub/shower combo, standard tile
- Interior doors and hardware
- Interior paint — standard two-coat finish
- City inspections and certificate of occupancy
When you get a proposal from Valley Casita Co., the base price covers all of the above. Your final contract will itemize everything so you know exactly what you're paying for.
What Costs Extra
Every lot is different. These are the site-specific conditions that add to the base price and are quoted separately after we review your property.
Extended Utility Runs
If your electrical panel, water main, or sewer cleanout is on the far side of your lot from where the casita will be built, the cost to extend those connections increases. A run under 50 feet is typically minimal. Runs over 100 feet — common on deeper lots — can add $3,000 to $8,000 depending on what's being extended.
Grading and Drainage
Phoenix lots that slope significantly or have drainage issues require grading work before the foundation can be poured. Most flat Valley lots don't trigger this cost, but hillside lots or lots with existing drainage problems do.
Upgraded Finishes
The standard finish package covers everything needed for a fully livable, market-ready unit. If you want hardwood or luxury vinyl plank flooring instead of standard tile, upgraded kitchen appliances, custom cabinetry, or a premium countertop material, those upgrades are priced separately.
Scottsdale Permit Fees
If you're building in Scottsdale (85251, 85253, 85254), permit fees run $5,000 to $8,000 — significantly higher than Phoenix. For Scottsdale projects, the base price adjusts to reflect the actual permit cost for your jurisdiction.
HOA Submission and Review
Some HOAs require a formal architectural review and submission fee before construction can begin. Where applicable, this is typically $300 to $1,500 and is handled by Valley Casita Co. as part of the permitting process.
Phoenix vs. Scottsdale: How Costs Differ
| Phoenix (85003, 85007, 85016, 85018) | Scottsdale / PV (85251, 85253, 85254) | |
|---|---|---|
| Base model pricing | Same across all VCC models | Same — finish standards match the market |
| Permit fees | $2,500 – $4,200 (included in base) | $5,000 – $8,000 (adjusted in proposal) |
| Permit timeline | 60 – 90 days | 120 – 180 days |
| HOA architectural review | Varies by community | More common, more rigorous |
| Rental income potential | $1,400 – $2,000/mo long-term | $1,800 – $2,800/mo long-term; significantly more STR |
Cost Per Square Foot in Context
Custom site-built casitas in the Phoenix metro run approximately $280 to $380 per square foot all-in, including permits, labor, materials, and standard finishes.
Smaller models trend toward the higher end of that range. The reason: permit fees, utility connections, and foundation work are largely fixed costs that don't scale with square footage. A 400 SF Studio and an 800 SF Retreat both need the same permit, the same panel upgrade, and the same slab — so the smaller unit carries a higher cost per square foot even though the total price is lower.
For comparison: the Phoenix metro median cost to build a primary home is currently $200 to $260 per square foot for production homebuilders. Custom builds run $300 to $500 per square foot. A site-built casita falls in the middle of that range because it benefits from simpler mechanical systems and smaller scope — but it's built to the same code and inspected to the same standard as a primary home.
Modular and prefab ADUs advertise lower per-square-foot costs, but the all-in price including site work, delivery, utility connections, and permit fees is typically closer to site-built than it appears on the spec sheet. If you're comparing a modular quote to a site-built quote, ask both contractors for the all-in number including all site work.
The ROI Question: Is a Casita Worth It?
The financial case depends on what you're building for. Here's how the math works across the three primary use cases.
Long-Term Rental Income
In VCC's target neighborhoods, a fully equipped casita rents for $1,400 to $2,200 per month on a long-term lease, depending on size and location. Arcadia and Scottsdale zip codes are at the top of that range; Encanto and South Phoenix are at the lower end.
On a $163,000 Casita model renting for $1,600/mo: gross annual income of $19,200, or a gross yield of about 11.8% before expenses. After property taxes, insurance, and occasional maintenance, net yield typically runs 8% to 9%. Break-even on the build cost at that yield is approximately 11 to 12 years — and the unit adds permanent equity from day one.
Short-Term Rental (Scottsdale)
Scottsdale is one of the strongest STR markets in the country. A well-positioned casita in 85251 or 85254 can generate $2,500 to $4,500 per month in gross Airbnb income at average occupancy. At the high end of that range, break-even on a $199,000 Retreat model is under 5 years.
STR income is higher but less predictable than long-term rental income. It also requires active management or a property manager (typically 20 to 25% of revenue). Phoenix and Scottsdale both regulate STR use — see our short-term rental casita guide for city-by-city rules.
Multigenerational / Family Use
The ROI here isn't rental income — it's the cost comparison to alternatives. Assisted living facilities in the Phoenix metro average $4,500 to $6,000 per month. A casita for a parent costs once to build and nothing after that (beyond utilities and insurance). Over five years, the avoided cost of assisted living is $270,000 to $360,000 — well above the build cost of any VCC model.
The casita also adds permanent appraised value to your property, making it a financial asset regardless of its current use.
How to Finance a Casita Build
The most common financing options for Phoenix-area casita construction:
HELOC (Home Equity Line of Credit)
The most popular option for homeowners with existing equity. Interest-only during the draw period, typically the lowest-cost financing available. Works best when you have at least $150,000 to $200,000 in available equity. See our HELOC vs. construction loan comparison for a full breakdown.
Construction-to-Permanent Loan
A single loan that covers the build phase and converts to a mortgage at completion. Requires only one closing. Works best for buyers who don't have sufficient equity for a HELOC or who prefer a fixed-rate structure.
Cash
The simplest option. No interest, no closing costs, fastest path to breaking ground.
We have relationships with Phoenix-area lenders experienced in ADU financing. If financing is part of your plan, we can make introductions as part of the initial consultation.
Frequently Asked Questions
How much does a casita cost in Phoenix?
A 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, permit fees, construction, and a standard finish package.
How much does it cost to build an ADU in Phoenix in 2026?
Custom site-built ADUs in Phoenix range from $133,000 to $325,000 depending on size. Modular options start lower but have higher all-in costs once site work, delivery, and permits are included. Permit fees in Phoenix run $2,500 to $4,200; in Scottsdale, $5,000 to $8,000.
What is included in the base price?
Every VCC base price includes: architectural drawings and engineering, standard permit fees, foundation, framing, insulation, exterior finishes, roofing, windows and doors, full electrical and plumbing, HVAC, standard kitchen package, bathroom fixtures, interior doors and paint, and certificate of occupancy. No hidden additions after you sign.
How much does a casita cost per square foot in Arizona?
Custom site-built casitas run $280 to $380 per square foot all-in including permits, labor, materials, and standard finishes. Smaller units trend toward the higher end of that range because fixed costs like permits and utility connections don't scale proportionally with square footage.
Is a casita worth it financially in Phoenix?
For most homeowners, yes. Long-term rental income in VCC's target neighborhoods runs $1,400 to $2,200 per month. For multigenerational use, the cost comparison to assisted living ($4,500 to $6,000/mo) makes the build cost of any VCC model recover in under 5 years of avoided care costs.
How much do permits cost for a casita in Phoenix?
Building permits for a casita in Phoenix typically cost $2,500 to $4,200. In Scottsdale, permit fees run $5,000 to $8,000. Valley Casita Co. includes standard Phoenix permit fees in the base price of every model.
Prices reflect Valley Casita Co.'s September 2026 pricing for standard configurations. Custom finishes, site-specific conditions, and Scottsdale permit fees are quoted separately. For a full itemized proposal for your specific lot, request a free quote here.
Want an exact number for your lot?