Hixson & unincorporated Hamilton County · checked Nov 13, 2026
Crawl space work in Hixson and unincorporated Hamilton County
Hixson addresses can be inside Chattanooga city limits or in unincorporated Hamilton County, and that decides which office issues your permit.
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Inside the city
The City of Chattanooga enforces the 2018 IRC (since May 26, 2023). Repairs, replacements and alterations that don't change the footprint use the Residential Modification Permit. Fees go by job value: $25 plus $5.75 for each $1,000 over $1,000, up to $50,000. An $8,000 job works out to about $65 (our arithmetic).
Outside the city
Hamilton County Building Inspection says "a building permit is required for any new, alteration, addition or repair to a structure." That includes unincorporated areas such as parts of Hixson, Ooltewah and Harrison.
Licensing
Residential jobs from $3,000 to $24,999 in Hamilton County need a Tennessee Home Improvement license; $25,000 and up needs a contractor license.
Radon
Hamilton County is EPA radon Zone 2. TDEC gives Tennessee residents free test kits and says 1 in 4 homes that request one test above 4 pCi/L.
Services
- Encapsulation
- Vapor barrier
- Dehumidifier
- Mold and musty smell
- Standing water and drainage
- Sagging floors and support jacks
- Insulation
- Inspection
- Cost guide
- Permits and rules
- Comparing quotes
Sources
- City of Chattanooga, Building Codes (2018 IRC adopted)
- City of Chattanooga, Residential Modification Permit
- City of Chattanooga, Residential Building Permit (fee schedule)
- Hamilton County, Building Inspection: Building Permits
- Tennessee Board for Licensing Contractors, Home Improvement License
- U.S. EPA, EPA Map of Radon Zones
- TDEC, Tennessee Radon Program (free test kits)
Prices are national ranges published by the sources above, not quotes. Your price depends on the system, access and timing; local companies quote after seeing the job.