Utah County · 16,898 residents
Santaquin ADU rules
Santaquin: internal ADUs allowed; detached ADUs allowed (lot 11,000+ sq ft).
Internal ADU (inside the home)
Detached ADU (backyard building)
Not yet fully verified · last reviewed September 7, 2026 See sources
Santaquin ADU rules at a glance
| Rule | Internal ADU (basement, attic, inside the home) | Detached ADU (backyard building) |
|---|---|---|
| Allowed? | Allowed | Allowed |
| Minimum lot | Not yet verified — confirm with the city | 11,000 sq ft |
| Parking | Ord. 02-03-2026 (eff. 2026-02-04): reduced attached ADU parking from 2 to 1 off-street space; tandem does not qualify | Not yet verified — confirm with the city |
| Zones | Attached ADUs allowed in any residential zone on parcels with a single-family dwelling (§10.16.080.B) | Historically MSR Main Street Residential, R-8, R-10; expansions considered/proposed for R-15 and R-20. Confirm which zones are finally adopted |
| Permit process | Per §10.16.080 — confirm application steps with planning | Per §10.16.080.C criteria — confirm current adopted text |
State law: detached ADUs from October 1, 2026
Santaquin is a “specified municipality” under Utah S.B. 284. Beginning October 1, 2026, it must permit one detached ADU as a permitted use on a lot of 11,000 sq ft or more that has a detached single-family home. The city can still apply setbacks, height, design, owner-occupancy and limited parking rules, and it may allow detached ADUs on smaller lots. How the state ADU laws work.
How our property map screens Santaquin lots
The map colors parcels using the rules on this page and the recorded lot size. A color is a planning screen, not a permit; Santaquin makes the decision.
- "Likely" above 15,000 sq ft is this site's planning band for a large recorded lot. It is not a sentence in the Santaquin code. Owner occupancy, parking, setbacks, zones, and HOA rules below still have to be checked.
Planned communities, PRDs and PUDs
Reviewed on September 22, 2026 against this city's research file, its published ADU page where one was found, and Utah meeting packets. No adopted sentence was confirmed that allows or bans an ADU in every PUD, PRD, PRUD, or planned community. If the assessor class or subdivision name says PUD, PRD, PRUD, planned unit development, planned residential development, planned community, resort community, or master planned community, the map keeps that lot highly unlikely regardless of size. A plat, CC&Rs, or development agreement can still prohibit an ADU where the zone allows one.
Planning notes for Santaquin
Santaquin posted a September 8, 2026 hearing on detached-ADU code amendments. That makes a current ordinance check especially useful for a new backyard project. We can help compare the existing local options with the final amendment and avoid treating a hearing proposal as permission already in effect.
Bring these to your review
- Proposed application timing
- Site plan and detached-unit concept
- Existing accessory-building permits
The question to resolve first
Which final standards will apply when you submit your detached-ADU application?
Sources
We link only to government sources and public meeting records. Codes change; confirm the current version with Santaquin before you apply.
- Santaquin public notices — September 8, 2026 ADU hearing
Hearing notice; final adoption is not established by this source
- Utah S.B. 284 (2026), enrolled bill
Statewide detached-ADU requirements for specified municipalities, operative October 1, 2026.
- Official Santaquin website
Common Santaquin ADU questions
Can you build an ADU in Santaquin?
Santaquin: internal ADUs allowed; detached ADUs allowed (lot 11,000+ sq ft). This is planning guidance, not a permit. Confirm the zone on your parcel with Santaquin.
What lot size does Santaquin require for an ADU?
Internal ADU: Not yet verified — confirm with the city. Detached ADU: 11,000 sq ft minimum.
How much parking does a Santaquin ADU need?
Internal ADU: Ord. 02-03-2026 (eff. 2026-02-04): reduced attached ADU parking from 2 to 1 off-street space; tandem does not qualify. Detached ADU: Not yet verified — confirm with the city.
What does it cost to build an ADU in Santaquin?
Wasatch Front planning bands are often about $55,000–$145,000 for an internal suite, $70,000–$175,000 for a garage conversion, and $95,000–$250,000 or more for a new detached unit, before unusual site work. These are planning ranges, not bids.
Can an HOA block an ADU in Santaquin?
City approval does not override CC&Rs or plat notes. Read the HOA documents and your subdivision plat before you design. A private restriction can stop a unit the city would otherwise allow.
Before you design: general checks for any Utah ADU
General planning advice, not Santaquin code.
- Confirm the zoning district on the city zoning map. The county assessor’s “residential” class is not zoning.
- Read your HOA CC&Rs and subdivision plat notes; private restrictions can block a unit the city allows.
- Sketch existing and proposed parking. Driveway geometry and access often decide what fits.
- Ask early about sewer, water and electrical capacity; utilities can force a redesign.
- Expanding a building’s footprint usually triggers full setback and height rules.
Nearby city ADU rules
Want to know what fits on your Santaquin lot?
Free, no obligation. We review your parcel against these rules and, if you want, introduce independent design and construction partners. Partners may pay us for referrals.
Utah ADU Builder provides educational planning guidance. This page is not legal advice and not a permit. Population: UGRC POPLASTESTIMATE / Census-derived municipal estimates (manual fill where UGRC blank). Editorial standards.