Accessory Dwelling Unit (ADU) in Millcreek, Utah
Required for construction of a secondary dwelling unit on a residential property in Millcreek, including basement apartments, detached cottages, and garage conversions.
Verified 2026-06-27 · Source
When you need this permit
- Property zoned for ADU use (check {city} zoning map)
- Owner-occupancy of primary or accessory unit (varies by city)
- Maximum size limits (typically 50-65% of primary dwelling or 1,000 sq ft)
- Adequate parking (typically one additional off-street space)
- Separate entrance from primary dwelling
Required documents
- Req
Building Plans
Full construction drawings including floor plan, elevations, and sections
- Req
Site Plan
Property layout showing both units, setbacks, parking, and access
- Req
Zoning Compliance Letter
Verification that the property qualifies for an ADU under {city} zoning code
- Req
Fire Separation Details
1-hour fire separation between units if attached/internal
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| ADU Land Use Fee | $175 | — |
| Building Permit | Based on valuation (see building permit fee schedule) | — |
Review timeline
~14–30 business days
Typical estimate — confirm current times with the Millcreek building department
Inspection process
- 1
Foundation
Footings, forms, rebar — before concrete pour
- 2
Framing
Structure, fire separation, egress windows
- 3
MEP Rough-In
Mechanical, electrical, plumbing rough-ins before walls closed
- 4
Insulation
Insulation and vapor barrier before drywall
- 5
Final
All work complete, smoke/CO detectors, address posted, ready for occupancy
Tips
- Utah HB 82 (2021) requires most cities to allow at least internal ADUs — but Millcreek may have additional local rules.
- Basement apartments in Millcreek must have egress windows in every bedroom (5.7 sq ft minimum opening).
- ADU impact fees in Utah are often reduced or waived — ask Millcreek about current fee schedules.
- A rental business license from Millcreek is typically required before renting an ADU.
Frequently asked questions
- Can I build an ADU in Millcreek?
- Most likely yes. Utah state law (HB 82) requires cities to allow internal ADUs. Millcreek may also allow detached ADUs depending on zoning. Contact Millcreek planning department to confirm your property qualifies.
- How much does an ADU permit cost in Millcreek?
- ADU permit fees in Millcreek follow the city fee schedule: ADU Land Use Fee — $175; Building Permit — Based on valuation (see building permit fee schedule). Under Utah law, impact fees for internal or attached ADUs may be reduced or waived — confirm with the building department.
Sources & verification
Key facts verified against official sources. Last reviewed 2026-06-27.
- Millcreek Building Department — official building department
- Greater Salt Lake MSD FY2026 Fee Schedule
Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Millcreek building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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