How are pier and beam foundations repaired?

In a defined sequence, not a single operation. An engineer first runs an elevation survey to map the high and low points and identify which piers, beams, and joists have failed. A crew then shores the structure with temporary support beams and hydraulic jacks, lifts it in small synchronized increments (often ⅛ to ½ inch per pass), installs permanent support — reshimming, adding concrete or steel piers, or sistering and replacing rotted lumber with pressure-treated material — then lowers the structure onto the new supports and re-checks level. The defining feature of pier and beam is that you fix the failed link in the load path rather than replacing the whole foundation, the way a slab repair often demands.

How much does pier and beam foundation repair cost?

Minor reshimming or a small re-level runs about $1,000–$3,500 (national average near $1,600). A typical whole-home re-leveling — shims plus a few new piers and minor beam work — lands in the $4,000–$11,000 range. Individual line items: roughly $2,000 to add a pier ($800–$4,000), about $800 to replace a beam ($400–$1,200), and $300–$600 per joist sistered. Extensive rot or termite rebuilds with limited crawl-space access can reach $20,000–$24,000 or more. Always demand an itemized, per-pier and per-beam scope, not a flat 'level the house' price.

How long does pier and beam repair take?

A straightforward reshim or partial re-level is often a one-to-two-day job. A whole-home re-leveling with new piers and beam work usually runs several days. Counterintuitively, a careful repair can take longer on purpose: the lift is done in small increments over multiple passes, sometimes holding the structure overnight between lifts so finishes can adjust. A contractor who promises to jack your house level in a single afternoon is describing exactly the kind of fast lift that cracks drywall and stresses plumbing.

Can I stay in my home during the repair?

Usually yes. Because pier and beam work happens from the crawl space underneath, most re-leveling and joist work is done without displacing the household — you may hear jacking and feel the floor move slightly, and some interior doors may need to be re-hung afterward. Extensive rebuilds involving multiple rotted beams, sill replacement, or significant lifts can be disruptive enough that some homeowners choose to leave temporarily. Your engineer and contractor should tell you which category your scope falls into before work starts.

Do I need an engineer for pier and beam repair?

For anything beyond a minor reshim, yes — and ideally an independent one. Per the ASCE Texas Section guidelines, diagnosing foundation movement and designing a lift, new piers, or a helical/push-pier scheme is the practice of engineering, not contracting. An independent Professional Engineer who is not selling the repair has no incentive to add piers or beams, and the sealed elevation survey gives you a defined scope to bid contractors against. Budget $500–$1,500 for the report. Verify any engineer's license on the Texas Board of Professional Engineers and Land Surveyors roster.

How do I know if my beams or joists are rotted?

From the crawl space, with a flashlight and a screwdriver. Brown rot crumbles wood into cube-shaped chunks; white rot leaves it spongy and stringy. Press a screwdriver tip into the underside of beams and sill plates — sound lumber resists, decayed lumber gives or flakes away. A pin-type wood moisture meter quantifies it: sustained readings above the fiber-saturation point (~28–30%) mean active decay risk per the USDA Wood Handbook, and readings around 16% already support surface mold per ASHRAE 160. Fungal fruiting bodies, a musty smell, and a sagging floor line are corroborating signs.

Is pier and beam easier to repair than slab?

Generally yes, and that is its biggest practical advantage. Because the piers, beams, joists, and plumbing are all reachable from the crawl space, a failed component can be diagnosed and fixed in place — a settled pier reshimmed, a rotted joist sistered, a leak repaired from below. The equivalent slab repair often means cutting or tunneling concrete, which can run several times the cost of the same fix on pier and beam. The tradeoff is that pier and beam's exposed wood needs ongoing moisture control that a slab does not.

Will the repair last?

Only if you fix the moisture that caused it. Re-leveling or sistering joists over a wet crawl space just rots the new lumber too — the repair addresses the symptom while the cause keeps working. A durable pier and beam repair pairs the structural work with drainage correction, leak repair, and usually crawl-space encapsulation, so the wood stays below the moisture thresholds that drive decay. Done that way, a pier and beam foundation lasts decades; done as structure-only, it can need re-leveling again in a handful of years.

Pier and Beam Foundation Repair: Methods and Cost (2026)

Q: What causes pier and beam foundations to fail?

Almost always moisture, directly or indirectly. The master variable in a pier and beam system is water: sustained crawl-space moisture rots beams, joists, and sill plates, while seasonal moisture swings in expansive clay push piers out of plumb and let undersized footings sink. Wood-decay fungi need sustained wood moisture above the fiber-saturation point — roughly 28–30% per the USDA Forest Products Laboratory — to begin destroying lumber, and damp crawl spaces also invite subterranean termites. Old CMU or concrete piers crumble, and compressed or missing shims drop their support. Fix the water and you remove the cause behind most of these.

Pier and beam foundation repair has one advantage no slab can match: you can fix it piece by piece. A settled pier gets reshimmed or replaced, a rotted joist gets sistered, a sagging beam gets supported — each failed link in the load path repaired in place, from the crawl space, without tearing out the whole foundation. But that advantage comes with a condition that decides whether the repair holds: moisture is the master variable in a pier and beam system, and nearly every structural failure traces back to it. Fix the water first — or alongside — and the repair lasts decades. Skip it, and you have simply bought yourself the same failure on a new timeline. This guide covers what actually goes wrong, how a proper repair is sequenced, the moisture rule that makes it durable, what it costs in 2026, and how to hire so an engineer scopes the work before any contractor bids.

This is the repair deep-dive. For how a pier and beam foundation is built — the anatomy, the load path, the pros and cons against slab — start with our pier and beam foundation guide. This page picks up where that one leaves off: matching each problem to its fix, walking the repair process, and pricing it honestly. Every cost figure here is a 2025–2026 industry-estimate range that varies by region, access, and scope; we treat them as planning numbers, not quotes.

What Goes Wrong (and What Each Problem Needs)

Almost every pier and beam complaint reduces to one of two root causes — soil movement (expansive clay swelling and shrinking, or undersized footings sinking) or crawl-space moisture (which rots wood and invites pests). Those root causes surface as six recognizable failure modes, and each calls for a specific repair. The table below is how an engineer reads your crawl space.

Problem	Cause	The repair it calls for
Pier settlement / out-of-plumb piers	Expansive clay shrinks and swells, pushing piers off vertical; undersized footings sink into poorly compacted soil	Reshim to corrected elevation; replumb or replace the pier; add a new pier on a proper footing; or underpin deeper with helical piers where surface clay is unreliable
Crumbling piers	Old CMU or deteriorated concrete piers spall and fail under load	Replace the pier — see concrete pier replacement for material choices and footing detail
Beam (girder) and joist rot	Sustained wood moisture above the fiber-saturation point (~28–30% per USDA FPL); brown rot crumbles wood into cubes, white rot leaves it spongy and stringy	Sister with pressure-treated lumber and galvanized fasteners, or cut out and replace the member — see joist sistering and replacement
Sagging and bouncing "roller-coaster" floors	Undersized or over-spanned joists (common pre-1970); rotted beams; settled piers; compressed or missing shims	Sister or add a mid-span beam; reshim; add support piers — depends on which link yielded, which is why the survey comes first
Deteriorated shims	Old wood shims rot or compress, reopening a gap between pier top and beam	Pull the old shims and reshim with steel shims to corrected elevation
Wood-destroying organisms	Subterranean termites build mud tubes in damp crawl spaces; decayed wood is easier for them to consume	Pest treatment, replace compromised lumber, and eliminate the conducive moisture condition — structural repair alone will not stop reinfestation
Crawl-space humidity	Warm humid air enters vents and condenses on cool framing; bare soil evaporates ground moisture; bulk water from poor drainage or leaks	Drainage correction, then vapor barrier and crawl-space encapsulation — the root-cause fix behind every rot and pest problem above

The six failure modes that account for nearly all pier and beam structural complaints, matched to the repair each one calls for.

Read down the "cause" column and the pattern is unmistakable: moisture is either the direct cause or the accelerant in almost every row. That is the single most important fact in pier and beam repair, and it is why the sequence below ends — and the durable version begins — with fixing the water.

The Repair Process, Step by Step

A proper pier and beam repair follows the load path in reverse, from the soil up, in six stages. The governing philosophy matters as much as the steps: professionals do not aim for a perfectly flat floor. They aim for structural stability and stopping the movement, lifting gradually over multiple passes because a slow lift minimizes cracking while a sudden over-lift cracks finishes and stresses plumbing.

1. Assessment and elevation survey. An engineer maps the floor's high and low points with a laser or water level, identifies the load-bearing lines, and inventories the condition of every pier, beam, joist, and sill plate reachable from the crawl space. Wood moisture meters and a hygrometer document the moisture state — because the survey has to find the cause, not just the symptom. The deliverable is a sealed report naming which physical interventions are needed and where.

2. Access and shoring. The crew enters the crawl space and sets temporary steel or heavy-timber support beams perpendicular to the floor joists at each work zone, then positions hydraulic jacks under the girder beams or load points. This carries the structure safely while the permanent supports are worked.

3. Synchronized incremental lift. The jacks are raised together in small increments — commonly ⅛ to ½ inch per pass — while a worker watches the drywall, doors, and floors above for stress. Cribbing supports the structure between lifts, and the lift is often held for a period (sometimes overnight) so finishes can adjust before the next pass. This is the most skill-dependent stage of the job; for the lift mechanics in depth, see our pier and beam leveling guide.

4. Support installation. With the structure raised to the target elevation, permanent support goes in. That means one or more of: steel shims between pier top and beam to take up the settlement gap; new poured-concrete, precast, CMU, or steel pipe piers on fresh footings where existing piers failed; or helical piers torqued down to competent, stable soil below the active moisture zone where the surface clay can't be trusted. Any new footing has to bear on competent soil and meet the minimum-width and frost-depth requirements of IRC §R403 — the same footing code that governed the original build — which is one reason added piers belong on an engineer's drawing rather than a contractor's guess. Concrete pier replacement covers the pier-material decision; helical piers cover the deep-bearing case.

5. Structural repair. Where wood has failed, it is sistered or replaced. Sistering bolts new pressure-treated lumber alongside the existing member to share the load; replacement cuts out beams, joists, or sill plates that are too far gone and swaps in new material. The non-negotiable detail: replacement lumber is pressure-treated and fastened with galvanized hardware, because the original failure was a moisture failure and the new wood has to outlast it. Joist sistering and replacement walks the beam-and-joist detail.

6. Lower and finalize. The structure is set down onto its new supports, the level is re-checked, and the engineer walks the interior to confirm doors and windows function before sign-off. Then comes the step that separates a repair that lasts from one that fails again: addressing the drainage and moisture that caused the movement in the first place.

That sixth step is not optional cleanup. It is the difference between a repair measured in decades and one measured in a handful of years — which is the subject of the next section.

Moisture First: The Rule That Makes Repairs Last

Here is the rule the cluster is built around: moisture is the master variable, so you fix the water first — or at minimum alongside the structural work — never after. Nearly every pier and beam failure traces back to it, which means re-leveling or sistering joists over a still-wet crawl space just rots the new lumber on the same clock that rotted the old. The structural repair treats the symptom; the moisture work removes the cause.

The thresholds are physical, not arbitrary. Per the USDA Forest Products Laboratory Wood Handbook — the standard U.S. reference for wood as a structural material — wood-decay fungi need sustained wood moisture above the fiber-saturation point, roughly 28–30%, to initiate decay. Surface mold grows lower, around 16% wood moisture per ASHRAE Standard 160, and damp crawl spaces invite subterranean termites. Keep the wood below those thresholds and it is biologically safe; let it ride above them and decay is just a matter of time. That is the entire engineering case for drying the crawl space.

In practice, "fix the water" is a short, ordered list:

Drainage and grading. Clean the gutters, extend the downspouts several feet past the foundation, and regrade so soil slopes away from the building. Bulk water from the outside is the first thing to cut off.
Plumbing leaks. A sub-floor supply or drain leak quietly soaks one zone of the crawl space and is a common hidden driver of localized rot and pier movement; repair it before sealing anything.
Vapor barrier and encapsulation. Cover the bare soil, seal the vents, and condition the space so ground moisture and humid summer air stop wetting the framing. In humid Texas, full crawl-space encapsulation — a 12–20 mil reinforced liner over the floor and up the stem walls, sealed vents, and a properly sized dehumidifier — is usually the right long-term move, and it is what holds the wood below the decay thresholds for good.

One caution from building science: do not encapsulate over standing water. If groundwater is intruding, the bulk-water source and any needed interior drainage come first; sealing a wet crawl space traps the problem instead of solving it. The order is always water out, then seal.

What It Costs

Pier and beam repair is itemized work, and an honest quote reads like a parts list — so many shims, so many piers, so many feet of sistered joist. The ranges below are national 2025–2026 industry estimates; Texas labor markets generally fall mid-range, and crawl-space access difficulty is the single largest cost multiplier. For a deeper per-element breakdown, see our per-pier cost guide.

Repair	2026 typical cost	Notes
Reshim / minor re-level	$1,000–$3,500 (avg ~$1,600)	The most common maintenance repair; expect roughly every 5–8 years in clay regions
Add a new pier	~$2,000 each ($800–$4,000)	Includes footing, pier, and shim; access drives the spread
Replace a girder beam	~$800 each ($400–$1,200); whole-home 10–12 beams $4,000–$12,000	Pressure-treated lumber and galvanized fasteners standard
Sister a floor joist	$300–$600 per joist	New PT lumber bolted alongside the existing member
Sill-beam replacement (incl. piers)	$4,000–$6,000	The sill is the most common rot site; often combined with new perimeter piers
Typical full re-leveling project	$4,000–$11,000	Shims plus a few new piers plus minor beam work — the middle of the market
Extensive rot / termite rebuild (limited access)	$20,000–$24,000+	Multiple beams, joist and sill replacement, difficult crawl
Periodic maintenance reshim (clay regions)	$800–$2,000	Returning-customer reshim every 5–8 years on expansive clay
Independent engineer's report	$500–$1,500	Elevation survey and sealed scope; independent of the contractor

Pier and beam repair cost ranges, 2025–2026 industry estimates. Access difficulty and scope drive the variance; figures are planning numbers, not quotes.

Two budget realities most homeowners miss. First, a permit is often required for structural foundation work — confirm with your local authority having jurisdiction, and note that in most Texas jurisdictions a sealed engineer's letter is part of the application. Second, homeowners insurance generally excludes settlement and earth movement, which describes most pier and beam movement by cause; the narrow exception is sudden damage from a covered peril, such as a burst supply line. That makes the engineer's report — which establishes what moved your foundation — the most important document in any claim.

How to Hire (Engineer-First)

The hiring order is the whole game, and it is the opposite of what the market pushes you toward. The contractor's "free inspection" is a sales call; an independent engineer's report is a scope of work. Engage your own licensed Professional Engineer first, get a sealed elevation survey and scope, then bid contractors against that document — not against each other's free estimates.

Why it matters structurally: an independent PE has no financial stake in the repair, so the report tells you what your home actually needs — how many shims, which piers, which beams — rather than what maximizes a sale. It also stops the most common upsell pattern in this niche, where the company that diagnoses the problem is the same company that sells the fix. Per the ASCE Texas Section guidelines, that diagnosis is the practice of engineering, not contracting.

A clean hiring checklist:

Independent PE survey and sealed scope first. Budget $500–$1,500. Verify the engineer's license on the Texas Board of Professional Engineers and Land Surveyors roster before you pay for anything.
Bid the scope, not a vibe. Hand contractors the engineer's report and require itemized, per-pier and per-beam line-item quotes against it. A flat "level the house" number is a bet by the contractor that almost always favors the contractor.
Confirm the moisture plan is in the scope. A bid that re-levels but says nothing about drainage, leaks, or encapsulation is quoting a repair that will fail again. The durable scope addresses the water.
Verify permits. Confirm whether your jurisdiction requires a permit and a sealed engineer's letter, and make a valid permit a condition of the contract — unpermitted structural work can quietly void warranties.

We do not perform inspections or repairs ourselves. We match San Antonio homeowners with vetted independent engineers and pier and beam specialists, and our recommendation is structurally that order: engineer first, contractor second. For what a good report should cost and contain, see our engineer's report guide.

FAQ Note

The FAQ below covers what San Antonio homeowners ask most after a first crawl-space visit — how the repair is sequenced, what it costs and how long it takes, whether you can stay in the home, how to spot rot, and why an engineer should scope it first. Full Q&A is rendered from the page frontmatter and emitted as FAQPage structured data for AI overviews and rich results. For the anatomy and build that sits behind these answers, start with the pier and beam foundation guide; for a structured second opinion before signing, get an engineer's report.

Get Matched With a Vetted San Antonio Pier and Beam Specialist

If your floors slope, a door has started to stick, or a contractor has quoted a "level the house" price you want checked, the right next step is a measurement, not a sales call. We'll match you with a vetted San Antonio pier and beam specialist and point you to an independent engineer who can scope the work before anyone bids it. The match is free, the quote is no-obligation, and we don't take a fee from you. We screen for sealed-engineer diagnosis, itemized per-pier and per-beam scopes, a gradual incremental lift, a moisture plan alongside the structural work, and a clean permit record. If a quote re-levels the house but ignores the water that caused the movement, we'll tell you — because on pier and beam, the moisture is the cause, and the structure is only the symptom.

Pier and Beam Foundation Repair: Methods, Process, and Cost