Cache County · 52,778 residents
Logan ADU rules
Logan: internal ADUs allowed; detached ADUs allowed (lot 11,000+ sq ft). Owner occupancy applies.
Internal ADU (inside the home)
Detached ADU (backyard building)
Not yet fully verified · last reviewed September 7, 2026 See sources
Logan ADU rules at a glance
| Rule | Internal ADU (basement, attic, inside the home) | Detached ADU (backyard building) |
|---|---|---|
| Allowed? | Allowed | Allowed |
| Minimum lot | Statewide statute includes a small-lot pathway around 6,000 sq ft for many internal ADUs — confirm how Logan applies it on your zone. | 11,000 sq ft. Statewide detached floor for specified municipalities: roughly 11,000 sq ft on qualifying single-family lots (operative Oct 1, 2026). Local code may allow detached ADUs on smaller lots sooner. |
| Owner occupancy | Only with detached, owner-occupied SFR that is owner's primary residence; non-owner-occupied properties prohibited. | Same owner-occupancy requirement. |
| Parking | ≥1 additional off-street stall beyond the two required for the SFR. | ≥1 additional off-street stall. |
| Zones | ADUs permitted in all zones citywide—subject to owner-occupied detached SFR condition. | Citywide with owner-occupied detached SFR. |
| Permit process | ADU Landlord License ($75) + building permit as needed; notarized owner-occupancy declaration; site/floor plans; annual renewal; no separate utility meters (two utility flats billed). | Same landlord license + building permit path; one ADU per property; cannot sell separately; Land Development Code §17.37.070. |
State law: detached ADUs from October 1, 2026
Logan 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 Logan 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; Logan 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 Logan 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 Logan
Logan’s ADU materials include a landlord-license application as well as the land-development standards. Plan for both the physical conversion and the permission to operate the unit. We can help check the current version of §17.37.070 and organize the information needed for an existing or proposed apartment.
Bring these to your review
- Existing permits and floor plan
- Owner occupancy and intended rental arrangement
- Site plan with entrance and parking
The question to resolve first
What land-use, building and landlord-license approvals does this unit need?
Sources
We link only to government sources and public meeting records. Codes change; confirm the current version with Logan before you apply.
- Logan Community Development — ADU application
Official city application material references LDC §17.37.070
- Utah S.B. 284 (2026), enrolled bill
Statewide detached-ADU requirements for specified municipalities, operative October 1, 2026.
- Official Logan website
Common Logan ADU questions
Can you build an ADU in Logan?
Logan: internal ADUs allowed; detached ADUs allowed (lot 11,000+ sq ft). Owner occupancy applies. This is planning guidance, not a permit. Confirm the zone on your parcel with Logan.
What lot size does Logan require for an ADU?
Internal ADU: Statewide statute includes a small-lot pathway around 6,000 sq ft for many internal ADUs — confirm how Logan applies it on your zone. Detached ADU: 11,000 sq ft minimum. Statewide detached floor for specified municipalities: roughly 11,000 sq ft on qualifying single-family lots (operative Oct 1, 2026). Local code may allow detached ADUs on smaller lots sooner.
Does Logan require the owner to live on the property?
Internal ADU: Only with detached, owner-occupied SFR that is owner's primary residence; non-owner-occupied properties prohibited. Detached ADU: Same owner-occupancy requirement.
How much parking does a Logan ADU need?
Internal ADU: ≥1 additional off-street stall beyond the two required for the SFR. Detached ADU: ≥1 additional off-street stall.
What does it cost to build an ADU in Logan?
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 Logan?
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 Logan 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 Logan 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.