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ADU Construction Permits in Salt Lake County, Utah
Permit required
Check local building codes, estimate your municipal fees, and review inspection requirements for 2026.
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Statewide Guide
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Local Project Overview
ADU Construction · Salt Lake County, Utah
Permit required
In Utah, a ADU Construction requires a building permit.
County adopted a 2024 ordinance reducing ADU barriers: detached ADU lots reduced from 12,000 to 7,000 sq ft minimum (6,000 in PC zone), reduced setbacks, height up to 20 ft, parking cut from 2 to 1 space. Distinctively, a 2024 county planning presentation reported only 2 ADUs had received both land-use and building permit approval in unincorporated Salt Lake County since 2021, despite 70.6% of surveyed residents expressing interest, illustrating a real adoption gap despite liberalized rules. Statewide, Utah SB284 (2025) requires every city with population 5,000+ to permit detached ADUs by October 2026. Plans are reviewed under the Salt Lake County / Greater Salt Lake Municipal Services Dist code (IRC Salt Lake County Cod); apply through Salt Lake City Building Permit before work begins.
Source: Salt Lake County / Greater Salt Lake Municipal Services Dist, IRC Salt Lake County Cod · County-specific · Verified 2026 by StateDataIndex
Building an Accessory Dwelling Unit requires complex zoning, structural, and utility permits.
Code Compliance & Inspections
Because of severe winter weather in Utah, any exterior structures or footings must be set below the local frost line to prevent shifting, as mandated by the Utah State Building Code.
Zoning & Cost Factors
Utah zoning is heavily influenced by rapid population growth and water availability, with local governments increasingly adopting high-density transit-oriented zoning. Fortunately, Utah maintains relatively builder-friendly regulations, keeping base permit fees competitive.
Permit fees in Salt Lake County
Permit fees vary by jurisdiction and by your project's valuation, so there is no single fixed figure for Salt Lake County. We only publish fees confirmed by real homeowners — none have been reported here yet.
Confirm the current fee directly with Salt Lake City Building Permit ((801) 535-6000). If you have paid for a permit here, you can add it here to help others.
Salt Lake County Building Department
Office: Salt Lake City Building Permit
Address: 451 S State St, Salt Lake City, UT 84111, USA
Phone: (801) 535-6000
Source: official Salt Lake County government records. Hours and procedures can change — call ahead to confirm.
How to Apply in Salt Lake County
In Salt Lake County, you can begin your application online through the county's permit portal, or submit blueprints and a property survey in person. Including your contractor's Utah Division of Occupational and Professional Licensing license number helps avoid rejections.
ADU Construction Requirements in Salt Lake County
Typical Submittal Package
When applying for a ADU Construction permit, you or your contractor will generally need to submit the following documentation for the city's review:
- Comprehensive architectural and structural plans
- Foundation engineering reports
- Sewer, water, and utility connection plans
- Site plan showing property lines and setbacks
Standard Ordinances & Processing Time
Key code points for a ADU Construction in Salt Lake County: ADUs typically have maximum square footage limits (often 800-1200 sq ft), height restrictions, and usually require dedicated off-street parking depending on local zoning.
Typical processing time: a few days to several weeks, depending on current workload and the season. Contact Salt Lake City Building Permit for a current estimate.
Frequently Asked Questions
What are the specific penalties for unpermitted ADU Construction work in urban Salt Lake County?
Building without authorization is considered a code violation. The local government can issue a Stop Work Order, forcing you to halt construction immediately. You may be subject to retroactive permit fees (often double the original cost), daily fines, or even a mandate to tear down the unpermitted work at your own expense.
Can a homeowner pull their own ADU Construction permit in Utah?
Yes. Utah generally allows property owners to act as their own general contractor under an Owner-Builder exemption. If you take this route, you assume full legal and financial liability and must ensure all work complies with the Utah State Building Code.
How much does a ADU Construction permit cost in Salt Lake County?
Permit fees vary by jurisdiction and by your project's valuation, so Salt Lake County does not publish a single fixed figure. Confirm the exact fee with the local building department before applying.
How long does it take to get a ADU Construction permit in Salt Lake County?
Processing time in Salt Lake County varies by season and current application volume at the building department; contact Salt Lake City Building Permit for a current estimate.
Where do I apply for a ADU Construction permit in Salt Lake County?
You can apply through the Salt Lake City Building Permit or online via the county permit portal. For questions, call (801) 535-6000.
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Planning an ADU? Tools homeowners use in the design and layout phase:
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Backyard ADU Design Guide (Book)
View on Amazon →
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Laser Level
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Franklin ProSensor Stud Finder
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25ft Tape Measure
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Other Permit Types in Salt Lake County
Planning another home improvement project? Check the requirements and fees for:
Nearby Jurisdictions in Utah
Building near the county line? Check requirements for neighboring areas: