ADU Construction in St. George, UT
Accessory dwelling units, garage conversions and in-law suites in St. George, UT: tell us the job once and we connect you with a contractor for it. Accessory dwelling units built to code - detached builds, garage conversions and basement suites - from feasibility and zoning through final occupancy. Housing in St. George is mostly detached single-family: 67% of units, with 14% in buildings of five or more units.
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- Licensed and insured contractors only
- Written scope before work starts
- No obligation on quotes
ADU Construction cost in St. George
Typical St. George range: $85,000 - $310,000 per unit. Reflects Utah labor and material costs. Estimate for planning, not a quote - call (844) 624-3161 for a written scope.
High-altitude UV, big temperature swings and real snow load mean assemblies rated for a mild climate fail early here.
Garage conversions read as the cheap route and often are, but the slab usually sits below the required floor height and lacks a moisture barrier, so the real scope includes the floor system most quotes leave out.
Utilities are the line item that surprises people: whether your existing panel and sewer lateral can carry a second dwelling, or whether you are trenching to the main.
What the job includes
- Zoning and feasibility review
- Plan sets and permit submittal
- Detached, attached and garage conversions
- Separate utility metering
- Kitchen and bath rough-in
- Final inspection and occupancy sign-off
Homes in St. George and adu construction work
Public figures for the city of St. George in Washington County, not the metro, and the general practice that follows.
Housing in St. George is mostly detached single-family: 67% of units, with 14% in buildings of five or more units.1 A mostly detached lot pattern is where backyard ADUs and garage conversions are physically possible; the first step is still a setback and lot-coverage check. Building permits in St. George are normally issued by the city building department.2,3 ADU plan review and permits go through the city building department; the contractor prepares the plan set and submits it.
67% of occupied homes in St. George are owner-occupied (70% statewide).1 Most of St. George's housing is recent: only 11% of units predate 1980 (U.S. 50%) and 27% were built since 2010.1 Newer subdivisions often carry HOA covenants that affect ADUs separately from zoning - check the CC&Rs before design spend. St. George sits in IECC climate zone 3B (Hot-Dry).4 In a mixed climate zone, the energy code balances heating and cooling; insulation levels and window ratings are set by the zone.
The median owner-occupied home in St. George is valued at $496,100 (ACS), close to the Utah median of $489,400.1 Values near the state median mean the standard scope and finish grades apply without adjustment. Heating and cooling loads are both real: about 3,205 heating and 2,416 cooling degree days a year (base 65°F).5,6 With both heating and cooling seasons, assemblies are specified for moisture movement in both directions.
| Before 1940 | 0.6% |
|---|---|
| 1940-1959 | 2.1% |
| 1960-1979 | 8% |
| 1980-1999 | 35.6% |
| 2000-2009 | 27% |
| 2010 or later | 26.8% |
Sources and notes (6)
- U.S. Census Bureau, American Community Survey 5-year estimates (ACS 2020-2024 5-year (released 2026-01))
- U.S. Census Bureau population estimates (Vintage 2024)
- U.S. Census Bureau geographic code files (2020)
- Guide to Determining Climate Zones by County: Building America and IECC 2021 Updates (PNNL-33270) (September 2022 (IECC 2021 county map))
- NOAA NCEI U.S. Climate Normals, nearest station (1991-2020 normals (published 2021))
- NOAA NCEI normals station inventory (1991-2020)
- Climate figures are for NOAA station St George, 3.3 miles from the place center; housing figures are ACS ACS 2020-2024 5-year with 90% margins of error in the source tables.
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St. George and nearby
Requests for St. George go through our national line, (844) 624-3161; we confirm whether a contractor can take the job. How a referral works.
ADU Construction nearby
Straight-line distances between place centers, not drive times. All ADU Construction in Utah
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Open St. George, UT in Google MapsADU Construction questions in St. George
How much does adu construction cost in St. George, UT?
Most adu construction projects in St. George, UT land between $85,000 and $310,000, depending on scope, access and material grade. That is an estimated range for planning, not a quote - call (844) 624-3161 and we will scope your job properly.
Can I legally build an ADU on my lot?
That depends on your zoning, setbacks, lot coverage and utility capacity. Feasibility review comes first, before any design spend.
What kind of housing does St. George have?
Housing in St. George is mostly detached single-family: 67% of units, with 14% in buildings of five or more units. 67% of occupied homes in St. George are owner-occupied (70% statewide). Census figures for the place itself, not the metro.
Who issues building permits in St. George?
Building permits in St. George are normally issued by the city building department. Whether a specific job needs one is decided by that office; the contractor confirms it before work starts.
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