Can I Build Room Addition in Salt Lake City, UT? (2026)
Find out if you can build a room addition in Salt Lake City, UT. Rules, permit requirements, costs, and next steps.
You can build a room addition in Salt Lake City, UT. Whether a permit is required depends on structural compliance and setback requirements.
Room addition permit requirements in Salt Lake City, UT govern room additions and structural expansions. The local building department enforces building permit requirements for room addition projects. The key factor determining whether you need a permit is structural compliance and setback requirements.
Room Addition Rules in Salt Lake City
Room Addition Rules in Salt Lake City: Permit required: Conditional.
Costs & Fees
Contact the local building department through their official website for current permit fees.
Next Steps
Next steps for building a room addition in Salt Lake City: 1. Verify whether your project meets the permit threshold. 2. If a permit is required, contact the local building department. 3. Submit plans and pay applicable fees. 4. Schedule required inspections through the local building department.
Salt Lake City Building Services
Phone: See official source
Website: https://www.slc.gov/building/
Online Permits: https://www.slc.gov/building/permits/
Frequently Asked Questions
Can I build an ADU in Salt Lake City?
Yes. Utah Senate Bill 174 (effective May 2021) requires Salt Lake City to allow internal ADUs by-right on all single-family lots. Salt Lake City's local code also allows detached ADUs in most residential zones. ADUs are limited to 1,000 sqft. No owner-occupancy requirement applies. Internal ADUs qualify for ministerial approval (no discretionary review) per state law.
What does Utah SB 174 require for ADUs?
Utah SB 174 (2021) requires all Utah municipalities to allow at least one internal ADU (within or attached to the primary dwelling) by-right on all single-family lots. Key protections: municipalities cannot require a conditional use permit for internal ADUs, cannot require owner-occupancy, and must approve code-compliant internal ADU applications ministerially. Salt Lake City also allows detached ADUs under local code.
Does Salt Lake City require a permit for short-term rentals?
Yes. Salt Lake City requires a Short-Term Rental License ($110/year) for all Airbnb-style rentals. The license number must be displayed on listings. Properties must meet housing and fire codes. Airbnb and VRBO collect and remit applicable Utah and Salt Lake County taxes on behalf of hosts.
What are the setbacks in an R-1-5000 zone in Salt Lake City?
In an R-1-5000 zone (minimum 5,000 sqft lot single-family), the setbacks are: 15 ft front, 5 ft each side, and 15 ft rear. ADUs must maintain 5 ft side and 10 ft rear setbacks for detached structures. Always verify specific parcel setbacks with the Salt Lake City Division of Planning.
Are solar panels required on new homes in Salt Lake City?
No. Utah does not have a residential solar mandate. Solar is voluntary in Salt Lake City. Rocky Mountain Power (the local utility) offers net metering for solar installations. HOAs have limited ability to prohibit solar under Utah Code Section 57-8a-404.
Source: Salt Lake City Building Services — Building Regulations. Last verified April 5, 2026. View source