Marana is an incorporated town with its own building safety department, so ADU permits come from the Town rather than Pima County. Feasibility splits sharply between platted subdivision lots, where coverage and HOA rules govern, and rural acreage, where septic capacity and utility distance do. Valdez Custom Builders, Arizona ROC 341570. Call (520) 909-0866.
Can you build an ADU in Marana?
Generally yes, subject to your parcel's zoning, size, setbacks, and existing lot coverage. Marana permits through its own building safety operation, and as the town has grown its review process has become more structured, which works in a homeowner's favor because expectations are clearer.
The practical answer depends heavily on which Marana you live in. On a platted subdivision lot in Continental Ranch or Gladden Farms, the binding constraints are usually lot coverage, setbacks, and community guidelines. On rural acreage, coverage is rarely the issue and the questions become infrastructure questions instead.
Septic, water, and floodplain
On acreage, three things decide the project. Septic capacity: adding a dwelling unit to a septic served property can require capacity evaluation and sometimes an expanded or new leach field, which is a meaningful cost item. Water source: properties on private wells need honest evaluation of yield and any shared use agreement before adding demand. Utility distance: running power and water to a detached structure two hundred feet from the house is a different project than one thirty feet away.
Floodplain matters more in Marana than in most of the metro. Portions of the town near the Santa Cruz River and its tributary washes carry designations that affect required finished floor elevation, foundation design, and insurance. We check this at the parcel research stage because it can substantially change both design and budget.
What it costs to build here
Marana ADUs generally run $120 to $250 per square foot, with a 600 to 800 square foot unit landing around $90,000 to $200,000.
Subdivision lots tend toward the predictable middle of that range: utilities are close, the site is flat, and access is good. Rural acreage varies far more widely, because utility runs, grading, and driveway access for concrete delivery can add substantially. The upside on acreage is that placement becomes a genuine design choice rather than fitting into the only legal corner.
One advantage across most of Marana: post-1990 construction means we rarely encounter galvanized plumbing, aluminum wiring, or asbestos, so estimates carry less contingency.
Where we build in Marana
Continental Ranch, Gladden Farms, Twin Peaks, the newer developments north of town, and the rural parcels along the Santa Cruz corridor. Dove Mountain also permits through Marana.
How we handle it
Parcel and zoning verification
We pull your parcel record, confirm the governing authority, and establish what your zoning, lot size, setbacks, and existing coverage actually permit before anyone draws anything.
Design and approvals
Floor plans, elevations, and structural details produced to satisfy the Town of Marana, plus HOA architectural review where your community requires it.
Permitting
We submit, respond to plan review comments, and follow the application through to issuance.
Construction and inspections
Site work through final, with every required inspection scheduled and passed in sequence.
Frequently asked questions
Who issues ADU permits in Marana?
The Town of Marana, through its own building safety department, rather than Pima County. This applies to Dove Mountain as well, since Dove Mountain lies within Marana town limits.
Can I build a guest house on rural Marana acreage?
Usually yes, and larger parcels make placement a genuine design decision rather than a constraint. The determining factors are typically septic capacity, water source, and how far utilities must run rather than zoning or coverage.
Does floodplain affect building an ADU in Marana?
It can. Portions of Marana near the Santa Cruz River and its tributary washes carry floodplain designations affecting required finished floor elevation, foundation design, and insurance. We verify floodplain status during parcel research before design begins.
How does septic affect adding an ADU?
Adding a dwelling unit to a septic served property may require a capacity evaluation and sometimes a new or expanded leach field. That is a real cost item and needs identifying before budgeting rather than after. It is one of the first things we check on rural Marana parcels.