ADU Builders in Paradise Valley, AZ (2026)

No — Paradise Valley does not currently permit ADUs. Paradise Valley has no accessory dwelling unit use in its Zoning Ordinance (codified through Ord. 2025-05) and sits outside Arizona's casita law: A.R.S. §9-461.18(H) applies only to municipalities with more than 75,000 people, and the Town has about 12,251. A guest house may be built as an accessory building in R-175, R-43, R-35, R-35A, R-18 and R-18A, but Zoning Ordinance §1004.D bars leasing or renting it separate and apart from the main house, and §1005.B bars dwelling use of an accessory building except by residential staff employed on the premises. The Town's own FAQ states that "the entire property must be rented as a whole." Read the current Paradise Valley ADU rules before hiring anyone; a contractor quote here is for planning only.

An ADU builder in Paradise Valley is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Paradise Valley's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in Arizona.

What ADU Builders Cost in Paradise Valley ^[18]^[19]^[20]

Based on our Paradise Valley cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.

New Detached ADU (all-in)	$300,000-$600,000
Cost per Sq Ft	$350-$750
Garage Conversion	$150,000-$250,000
Prefab / Modular ADU (installed)	$200,000-$400,000
City Permit & Plan Review	Valuation-based (minimum $225 per livable sq ft): $1,436.92 plus $5.40 per $1,000 over $150,000, plus 65% of that for plan review (Master Fee Schedule, App. B, eff. 7/1/2025). About $2,000-$3,500 in Town fees for a 500-1,200 sq ft guest house
Impact Fees	None. The Master Fee Schedule (Appendix B, amended through Res. 2025-05, effective July 1, 2025) has no development impact fee. The only capacity charge is the Wastewater Development Fee — $7,847 for a 1-inch-or-smaller meter (Res. 2017-02) — due on a new sewer connection or meter enlargement, so a guest house on the existing connection normally owes nothing; the Town verifies meter size and installation date. On a septic lot, Maricopa County Environmental Services must approve the added bedrooms before the Town permit issues

For a full line-item breakdown, see our Paradise Valley ADU cost guide. To confirm what you're allowed to build before you hire, review the Paradise Valley ADU rules (max detached size: No square-foot cap. Two limits bind: all accessory buildings and structures together may not occupy more than one-half of the main building's ground area (§1005.A; Policy #53: first floor incl. covered patios and attached garage, overhangs excluded; Policy #59: wall face to wall face plus roofed patios and ramadas); and the guest house counts toward the lot's 25% floor area ratio in R-175 through R-18A, "inclusive of all areas under roof" (Table 1001-A1; FAR Certification handout rev. 6-29-26); owner-occupancy: Stricter than owner-occupancy: house and guest house are one tenancy. §1004.D: no accessory building on a residentially-zoned property "shall be leased, subleased or rented, separate and apart from the main building," and vice versa. §1005.B bars using an accessory building "for dwelling purposes other than by residential staff employed on the premises," and §201 says staff quarters "may not be rented for profit." Town FAQ: "the entire property must be rented as a whole").

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How to Vet an ADU Builder in Paradise Valley

License: Confirm a current contractor's license in Arizona and that it's in good standing. Ask for the license number and verify it with the state board.
ADU-specific experience: Ask how many ADUs they've completed in or near Paradise Valley and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits (Valuation-based (minimum $225 per livable sq ft): $1,436.92 plus $5.40 per $1,000 over $150,000, plus 65% of that for plan review (Master Fee Schedule, App. B, eff. 7/1/2025). About $2,000-$3,500 in Town fees for a 500-1,200 sq ft guest house), plan check (In-house residential plan review; the 65% fee covers two rounds, further rounds $145 per hour. Fire sprinklers are required in every new structure (deferred submittal; residential sprinkler plan review $0.06 per sq ft). Setback and height certifications by an Arizona-registered professional are required at stem inspection when within 3 ft of a setback or 2 ft of the height limit, and a stamped FAR certification at framing or roof-nail once the lot's FAR reaches 22%. Water-meter verification is required on Town sewer; ACCA Manual J and S calculations with new dwellings), and impact fees (None. The Master Fee Schedule (Appendix B, amended through Res. 2025-05, effective July 1, 2025) has no development impact fee. The only capacity charge is the Wastewater Development Fee — $7,847 for a 1-inch-or-smaller meter (Res. 2017-02) — due on a new sewer connection or meter enlargement, so a guest house on the existing connection normally owes nothing; the Town verifies meter size and installation date. On a septic lot, Maricopa County Environmental Services must approve the added bedrooms before the Town permit issues) are included.
Permit handling: Confirm they manage Paradise Valley's permit process ("Standard building permit through Community Development (6401 E Lincoln Dr; 480-348-3692). The Town's Building Permit Application Information sheet lists "guest house" among the structures needing their own permit and warns not to file every permit at once because each is valid 180 days. The site plan must show the accessory-to-main-house ground-area percentage (50% maximum) and a FAR table (Standard Residential Flatland Submittal Requirements). Hillside lots with a building-site slope of 10% or more go to the Hillside Building Committee before a permit application. There is no path to a rental unit: §1004.D leaves the Board of Adjustment nothing to vary", typically Up to 15 business days per plan-review round, then 3-5 business days to issue the permit once plans are approved (Town Building Permit Application Information). Hillside lots add Hillside Building Committee review before the permit application is accepted) and who is responsible if revisions are required.
Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.

Questions to Ask Before You Hire

How many ADUs have you built in Paradise Valley in the last two years?
Is your bid fixed-price, and what would trigger a change order?
Are permits, plan check, and utility connection fees included?
What's a realistic timeline, including permit review (Up to 15 business days per plan-review round, then 3-5 business days to issue the permit once plans are approved (Town Building Permit Application Information). Hillside lots add Hillside Building Committee review before the permit application is accepted) and construction?
Who is my point of contact and how are delays communicated?
What warranty do you provide on workmanship?
Can you share three recent Arizona ADU client references?

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Frequently Asked Questions

How much do ADU builders charge in Paradise Valley?

ADU builders in Paradise Valley typically quote $300,000-$600,000 for a new detached unit, or about $350-$750 per square foot, including design, permitting, and construction. A garage conversion runs $150,000-$250,000 and a prefab/modular ADU averages $200,000-$400,000. Add city permit and plan-review fees (Valuation-based (minimum $225 per livable sq ft): $1,436.92 plus $5.40 per $1,000 over $150,000, plus 65% of that for plan review (Master Fee Schedule, App. B, eff. 7/1/2025). About $2,000-$3,500 in Town fees for a 500-1,200 sq ft guest house) plus impact fees of None. The Master Fee Schedule (Appendix B, amended through Res. 2025-05, effective July 1, 2025) has no development impact fee. The only capacity charge is the Wastewater Development Fee — $7,847 for a 1-inch-or-smaller meter (Res. 2017-02) — due on a new sewer connection or meter enlargement, so a guest house on the existing connection normally owes nothing; the Town verifies meter size and installation date. On a septic lot, Maricopa County Environmental Services must approve the added bedrooms before the Town permit issues. Quotes for the same scope commonly vary 20-40% between builders, so collect at least three bids.

How do I find a good ADU builder in Paradise Valley?

Look for a licensed contractor with completed ADU projects in Paradise Valley specifically — ADUs involve local zoning, setback rules, and utility connections that general remodelers may not have handled. Verify the license, ask for an ADU-specific portfolio and references, confirm they carry liability and workers' comp insurance, and get a written fixed-price or detailed bid. Submit a request below and we'll forward it to local ADU builders serving Paradise Valley for free quotes.

Do ADU builders in Paradise Valley handle permits?

Most full-service ADU builders manage the permit process for you. In Paradise Valley the approval process is "Standard building permit through Community Development (6401 E Lincoln Dr; 480-348-3692). The Town's Building Permit Application Information sheet lists "guest house" among the structures needing their own permit and warns not to file every permit at once because each is valid 180 days. The site plan must show the accessory-to-main-house ground-area percentage (50% maximum) and a FAR table (Standard Residential Flatland Submittal Requirements). Hillside lots with a building-site slope of 10% or more go to the Hillside Building Committee before a permit application. There is no path to a rental unit: §1004.D leaves the Board of Adjustment nothing to vary" with a typical review timeline of Up to 15 business days per plan-review round, then 3-5 business days to issue the permit once plans are approved (Town Building Permit Application Information). Hillside lots add Hillside Building Committee review before the permit application is accepted. Confirm in writing whether permit fees, plan check (In-house residential plan review; the 65% fee covers two rounds, further rounds $145 per hour. Fire sprinklers are required in every new structure (deferred submittal; residential sprinkler plan review $0.06 per sq ft). Setback and height certifications by an Arizona-registered professional are required at stem inspection when within 3 ft of a setback or 2 ft of the height limit, and a stamped FAR certification at framing or roof-nail once the lot's FAR reaches 22%. Water-meter verification is required on Town sewer; ACCA Manual J and S calculations with new dwellings), and impact fees are included in the bid or billed separately.

How long does it take to build an ADU in Paradise Valley?

Plan for the permit review (Up to 15 business days per plan-review round, then 3-5 business days to issue the permit once plans are approved (Town Building Permit Application Information). Hillside lots add Hillside Building Committee review before the permit application is accepted in Paradise Valley) plus construction. Most detached ADUs take 4-8 months of construction after permits are issued; garage conversions and prefab units are often faster. Ask each builder for a realistic schedule and what could delay it.

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Build Cost	$300,000-$600,000
Garage Conv.	$150,000-$250,000
Permit Fees	Valuation-based (minimum $225 per livable sq ft): $1,436.92 plus $5.40 per $1,000 over $150,000, plus 65% of that for plan review (Master Fee Schedule, App. B, eff. 7/1/2025). About $2,000-$3,500 in Town fees for a 500-1,200 sq ft guest house
Timeline	Up to 15 business days per plan-review round, then 3-5 business days to issue the permit once plans are approved (Town Building Permit Application Information). Hillside lots add Hillside Building Committee review before the permit application is accepted
1BR Rent	$1,800-$1,950/mo

What ADU Builders Cost in Paradise Valley [18][19][20]