Wasatch County · 6,011 residents
Midway ADU rules
Midway: internal ADUs allowed (lot 6,000+ sq ft); detached ADUs allowed only in limited cases (lot 22,000+ sq ft).
Internal ADU (inside the home)
Detached ADU (backyard building)
✓ Checked against city sources on September 24, 2026 See sources
Midway ADU rules at a glance
| Rule | Internal ADU (basement, attic, inside the home) | Detached ADU (backyard building) |
|---|---|---|
| Allowed? | Allowed | Allowed only in limited cases |
| Minimum lot | 6,000 sq ft. Your lot must be at least 6,000 sq ft, and common or shared HOA area does not count toward it. | 22,000 sq ft. Midway does not have a detached ADU ordinance; the closest option, a detached two-family dwelling, needs a lot of at least 22,000 sq ft in the R-1-7 zone or 33,000 sq ft in the R-1-9 zone. |
| Owner occupancy | The home must be the owner's primary residence, and the internal unit cannot be rented if the owner does not live there. | For a detached two-family dwelling, one of the two units must be occupied by the owner or a relative by blood, marriage or adoption, and both units must stay under one ownership. |
| Parking | One additional on-site parking space (at least 9 x 20 ft) is required, plus replacement of any garage or carport spaces lost; the stall cannot be in the front setback except within an approved driveway. | A detached two-family dwelling must have adequate off-street parking for each unit and a hard-surfaced driveway for both. |
| Size limits | The unit must be created within the existing footprint of the home; only one internal unit per home. | The living area of one dwelling cannot be more than 70% of the other's; a unit may be built above or below a detached garage. |
| Zones | Permitted in any area zoned primarily for residential use. | Detached two-family dwellings are listed as permitted uses in the R-1-7 and R-1-9 zones. |
| Short-term rentals | Renting for less than 30 consecutive days is prohibited. | Not yet verified — confirm with the city |
| Permit process | Register the unit with Midway Community Development using the IADU Registration form (notarized affidavit); a city license is required to rent it, and the city may record a notice against the property. | Not yet verified — confirm with the city |
How our property map screens Midway 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; Midway makes the decision.
- The statewide map screen starts a new external ADU at about 11,000 sq ft. Midway's researched external minimum is 22,000 sq ft. Lots below that city minimum stay highly unlikely on the map even when they clear 11,000 sq ft.
- Because external ADUs are limited in the Midway research, the map does not mark a new external ADU as likely there.
- "Likely" above 15,000 sq ft is this site's planning band for a large recorded lot. It is not a sentence in the Midway 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.
Sources
We link only to government sources and public meeting records. Codes change; confirm the current version with Midway before you apply.
- Midway City — Internal Accessory Dwelling Unit (IADU) Registration application (June 2026)
IADU requirements from Midway Code 16.13.380: 1 per lot, owner occupied, 30-day minimum rental, lot > 6,000 sq ft, 1 parking stall
- Midway City — Planning & Zoning (applications, link to code)
Official planning page listing the IADU application
- U.S. Census Bureau — Utah subcounty population estimates, Vintage 2025 (sub-est2025_49.csv)
July 1, 2025 population estimates for Utah cities and counties
- Utah S.B. 284 (2026) enrolled — Local Land Use Modifications
Enacts Utah Code 10-21-304 (detached ADUs on lots of 11,000 sq ft or more in specified municipalities, effective Oct 1, 2026) and the 'specified municipality' definition
- Utah Code Title 17, Chapter 60 (county classification, 17-60-104/105)
Current county class population thresholds: 3rd class 40,000-259,999; 4th class 12,000-39,999
- Official Midway website
Common Midway ADU questions
Can you build an ADU in Midway?
Midway: internal ADUs allowed (lot 6,000+ sq ft); detached ADUs allowed only in limited cases (lot 22,000+ sq ft). This is planning guidance, not a permit. Confirm the zone on your parcel with Midway.
What lot size does Midway require for an ADU?
Internal ADU: 6,000 sq ft minimum. Your lot must be at least 6,000 sq ft, and common or shared HOA area does not count toward it. Detached ADU: 22,000 sq ft minimum. Midway does not have a detached ADU ordinance; the closest option, a detached two-family dwelling, needs a lot of at least 22,000 sq ft in the R-1-7 zone or 33,000 sq ft in the R-1-9 zone.
Does Midway require the owner to live on the property?
Internal ADU: The home must be the owner's primary residence, and the internal unit cannot be rented if the owner does not live there. Detached ADU: For a detached two-family dwelling, one of the two units must be occupied by the owner or a relative by blood, marriage or adoption, and both units must stay under one ownership.
How much parking does a Midway ADU need?
Internal ADU: One additional on-site parking space (at least 9 x 20 ft) is required, plus replacement of any garage or carport spaces lost; the stall cannot be in the front setback except within an approved driveway. Detached ADU: A detached two-family dwelling must have adequate off-street parking for each unit and a hard-surfaced driveway for both.
Can an ADU in Midway be a short-term rental?
Internal ADU: Renting for less than 30 consecutive days is prohibited. Detached ADU: Not yet verified — confirm with the city.
What does it cost to build an ADU in Midway?
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 Midway?
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 Midway 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 Midway 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: U.S. Census Bureau population estimate (2025). Editorial standards.