Expect $150 to $400 per square foot for construction, depending on finishes, site conditions, and whether you need a septic connection or utility extension. A modest 600 square foot casita typically lands in the $200,000 to $280,000 range all-in. Paradise Valley lots are large and the town has its own review process separate from Phoenix or Scottsdale, which can add time and occasional design requirements. Permit and development fees in Paradise Valley generally run $5,000 to $12,000 on top of construction costs. We give you a fixed-price contract before a single shovel hits the ground.

This is a real point of confusion. Arizona House Bill 2720 expanded ADU rights statewide, but it specifically exempts municipalities with populations under 75,000. Paradise Valley falls below that threshold, so HB 2720 does not override the town's own zoning rules. Paradise Valley governs ADUs under its own code, and the town has historically been conservative about additional dwelling units on residential lots. We review your specific parcel and zoning designation before we quote you anything, because not every lot qualifies.

Upfront cost and timeline are the honest answers. A detached ADU is essentially building a small house, with its own foundation, framing, mechanical systems, and utility connections. In Paradise Valley, plan review alone can take several months. The return is real, whether that is rental income, housing a family member, or added resale value, but you need to go in knowing this is a six-figure investment with a multi-month construction window, not a quick backyard project.

An addition to the main house is usually less expensive per square foot because you are sharing existing walls, roof, and sometimes mechanical systems. A detached ADU costs more because it needs its own foundation, roof, HVAC, electrical panel, and plumbing runs. That said, a detached unit gives you true separation, which matters if your goal is a rentable unit, an aging parent's private space, or a home office with genuine privacy. We build both and we will walk you through which option makes more sense for your property and your goals.

Paradise Valley restricts short-term rentals more aggressively than most Valley cities. Long-term rentals, meaning leases of 30 days or more, are generally permitted for legal ADUs, but short-term platforms like Airbnb are subject to the town's short-term rental rules and registration requirements. Verify current rental regulations with the Town of Paradise Valley directly before you factor short-term rental income into your return-on-investment math. We can build the unit. How you use it is something you confirm with the town.

From the day you sign a contract to the day you hand someone a key, budget 10 to 16 months for a detached ADU in Paradise Valley. Design and engineering typically takes 6 to 10 weeks. Town plan review adds another 8 to 16 weeks depending on workload and whether revisions are requested. Construction on a 500 to 800 square foot detached unit runs 4 to 6 months once permits are in hand. Contractors who quote you six months total are not accounting for Paradise Valley's review process.

We handle design, structural engineering, permit submittals, town coordination, and all construction trades under one contract. You are not hiring an architect separately, then a permit expediter, then a GC. You have one point of contact and one fixed price. What you handle is decisions, approvals on finishes and layout, and any HOA submittals if your neighborhood requires them. Many Paradise Valley neighborhoods have architectural review committees that operate separately from the town, and we will flag that early if it applies to your property.