Free referral service · Chattanooga area
Sagging floors and crawl space support jacks
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What usually gets quoted
- Added supports (piers or adjustable steel jacks) under a beam that spans too far or has settled.
- Sistering or replacing joists where wood is cracked, notched or rotted.
- Replacing a beam (girder) that has failed or rotted.
- Moisture work, because rot and termites follow damp wood. UT Extension says to keep wood from touching soil and to keep the crawl space soil dry.
What does it cost?
| Job | Range | Source |
|---|---|---|
| Sagging floor (added to encapsulation) | $1,500 to $10,000 | Angi 2026 |
| Support pier, each | $1,000 to $2,000 | HomeGuide 2026 |
| Beam replacement | $1,500 to $5,000 | Angi 2026 |
| Beam replacement | $1,500 to $4,000 | HomeGuide 2026 |
| Underpinning | $3,000 to $15,000 | Angi 2026 |
| Structural engineer plan | $250 to $1,000 | HomeGuide 2026 |
| Typical crawl space repair | $4,500 to $8,000 (average $6,000) | Angi 2026 |
Replies in one r/Chattanooga thread mentioned bids as high as $60,000 when new beams were included. Big spreads like that are a reason to get the problem written down by more than one company, or by an engineer, before you compare prices.
Permits and engineers
HomeGuide says a structural engineer's plan is typically required to get a building permit for this kind of repair. Locally, Signal Mountain's permit list names "foundation repair, crawlspace encapsulation and structural repairs"; Hamilton County requires a permit for any repair to a structure; and East Ridge exempts only cosmetic work. Chattanooga's Residential Modification Permit covers repairs that don't change the footprint. Details on our permits page.
What to ask
- What is causing the sag: span, settlement, rot, termites or moisture? Ask to see it, or for photos.
- Will the jacks or piers sit on footings, and how big are they?
- Is the floor lifted all at once or a little at a time? Ask how they protect drywall, trim and tile while the floor is raised.
- Who pulls the permit, and is an engineer letter included?
- If termites are involved, the Tennessee Department of Agriculture says to ask a pest company to show you the termites or damage before you sign a treatment contract.
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Sources
- Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026)
- Angi, How Much Does Crawl Space Repair Cost? (updated Oct 8, 2026)
- HomeGuide, Crawl Space Repair & Cleaning Cost (Feb 5, 2026)
- UT Extension PB1344, Subterranean Termite Control (PDF)
- r/Chattanooga, "Crawlspace advice" (July 26, 2024): a homeowner's two quotes, $7,500 and $12,500
- Town of Signal Mountain, Permits for Residential Construction (rev. Aug 2026, PDF)
- Hamilton County, Building Inspection: Building Permits
- City of East Ridge, Building Codes
- City of Chattanooga, Residential Modification Permit
- Tennessee Department of Agriculture, Pesticide Consumer Tips
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.