Post and pier service guide
Support post and pier repair, including crawl space post replacement, restores stable bearing below crawl space beams when posts settle, tilt, rot, rust, crack, or lose contact with the beam above.
Repair methods
The right repair depends on which member is damaged, whether support below it is stable, and whether moisture caused the failure.
| Method | Best fit | Important caution |
|---|---|---|
| Re-shimming | Minor gaps where existing support is stable | Not enough when piers are sinking or leaning |
| Steel support post | Localized beam support or gradual floor lift | Needs proper base, top connection, and bearing |
| Post replacement | Rotted, rusted, crushed, undersized, or improperly set posts | The new post needs a proper footing and a positive connection to the beam |
| Concrete footing or pad | Soft soil, settled supports, or missing bearing base | Footing size should match load and soil conditions |
| Pier rebuild | Cracked, leaning, or poorly stacked masonry supports | Temporary support may be needed |
| Moisture and drainage correction | Wet soil, standing water, rust, or wood decay | Protects the repaired support system |
When needed
These signs help homeowners ask focused questions during a crawl space inspection.
A crawl space post is leaning, rusted, rotted, cracked, or loose.
Concrete blocks are stacked unevenly or set directly on soil.
Shims are crushed, loose, or repeatedly adjusted.
A beam has dropped away from its support.
Floors sag near a support line rather than in only one small spot.
Soil around a pier is wet, eroded, or visibly disturbed.
A previous repair used temporary jacks as permanent supports.
Interior cracks or sticking doors appeared as the floor shifted.
The crawl space has drainage, humidity, or pest conditions near supports.
Repair sequence
Structural repair works best when the cause, support path, and crawl space environment are reviewed together.
| Step | What to confirm | Why it matters |
|---|---|---|
| Inspect from below | Member condition, bearing, moisture, pests, access | Identifies the actual repair target |
| Trace the load path | Joists, beam, posts, piers, footing, soil | Prevents shifting the problem to another weak point |
| Correct active moisture | Leaks, drainage, vapor, humidity, wet insulation | Keeps new wood or supports protected |
| Prepare stable access | Debris, insulation, old liner, tight clearances | Allows accurate repair and safer work |
| Complete structural repair | Materials, fastening, bearing, shoring, lift limits | Restores support without over-lifting |
| Document and monitor | Photos, measurements, warranty terms, maintenance | Helps compare results over time |
Quote review
Structural quotes should make cause, scope, access, materials, and exclusions clear.
Which member or support is being repaired?
Is the cause moisture, settlement, pest damage, age, or poor installation?
Are temporary supports or gradual lifting included?
Are footings, posts, fasteners, connectors, and materials specified?
Is access, cleanout, or insulation removal included?
Is moisture control included or listed separately?
Is an engineer or permit needed?
What warranty conditions depend on keeping the crawl space dry?
Related pages
Use these pages to connect floor movement to likely crawl space causes and repair planning.
FAQs
Short answers for homeowners comparing structural crawl space repairs.
Re-shimming only closes a small gap under a post that is otherwise sound and sitting on a stable footing. Crawlspace post replacement is the better fit when the post itself is rotted, rusted, crushed, split, or undersized, when it is set directly on soil or on loose stacked blocks, or when the footing under it has settled. Replacing the post without correcting the footing usually repeats the problem.
As a planning range, not a quote, replacing a single crawl space support post with a new post on a proper footing often falls around $500 to $2,000 per post. Beam repair, multiple posts, poor access, or gradual floor lifting push the total higher. Get a written scope that names the post, the footing, and the connection to the beam before comparing prices.
Sometimes, but only if moisture is not part of the cause. If water, high humidity, wet insulation, or wood decay is present, the repair plan should also address the crawl space environment.
No. Encapsulation controls the crawl space environment. Structural repair restores damaged or missing support. When both are needed, structural work usually comes first.
An engineer may be needed when load paths are unclear, damage is widespread, settlement is active, major members are replaced, permits require it, or the repair affects real estate negotiations.
Sources
These pages use current cost references, structural repair explainers, and crawl space moisture guidance.
Last reviewed: July 30, 2026.