Pier & Beam Foundation Repair San Antonio, TX

Pier and beam foundation repair in San Antonio restores a raised house that sits on wooden joists and beams over a crawl space, with concrete or masonry piers below. If you can access dirt under the floor, you do not have a slab. Thousands of pre-1960 homes in Alamo Heights, Monte Vista, Terrell Hills, and Olmos Park still run on original lumber that is now rotting, settling, or both.

We inspect the crawl space first, then relevel floors, replace failed beams, adjust piers, and stop the moisture that caused the damage. You usually stay in the home. Work happens underneath, not in the living room.

How to tell if you have pier and beam

Raised first floor, crawl space 18–36 inches (sometimes less on historic lots), floor vents or an access door on the perimeter. No crawl space and concrete at ground level means slab. Not sure? The first 30 minutes of a free inspection settles it. Comparison guide: slab vs pier and beam.

Signs your pier and beam needs work

• Sagging or bouncy floors in the center of rooms
• Musty smell, standing water, or visible fungus in the crawl space
• Rotten, cracked, or termite-damaged beams and joists
• Shifting or crumbled concrete pier blocks
• Gaps between floor and baseboards, or floors that slope toward the street
• Doors that swing open on their own or will not latch after a wet spring

Bouncy floors without exterior brick cracks are still a foundation problem on pier-and-beam. The failure is often in the middle of the span, where a slab contractor looking only at brick would miss it.

Where pier and beam is most common

Central San Antonio neighborhoods built before 1950 still have crawl spaces too shallow for modern equipment. We work in Alamo Heights and Universal City on raised floors that need targeted lumber, not wholesale exterior excavation. Mature live oaks pull moisture unevenly from clay. One side of the crawl space dries, piers settle, and floors slope toward the thirsty tree. Roots rarely snap a pier. They steal water.

Historic-district access matters. Tight side yards, limestone walks, and original millwork mean we relevel from below instead of trenching a modern slab-style perimeter. If a company only sells steel push piers and will not crawl, they are the wrong contractor for this house.

Local pier-and-beam averages around $9,000, often below slab jobs because we can fix sections. Full lumber replacement across a large crawl space closes that gap. Pricing logic: San Antonio cost guide.

Repair methods we actually use

Screw-jack or shim adjustments on sound piers when settlement is modest and lumber is dry. Sistering joists or replacing beams when rot or termite damage has eaten section. New supports where spans are too long for original design. Crawl-space helical or steel supports when a pier has failed and soil will not hold a reset block. Girder repair when the main beam has sagged.

We do not encapsulate every crawl space as a default package. Vapor barriers, added vents, and fixing water at the source (grade, downspouts, French drains) solve most musty San Antonio crawl spaces. A fully sealed encapsulate with a dehumidifier is a related specialty. If you need that, we say so. We will not sell $20,000 of plastic over a grading problem that a $3,000 drain would fix.

Crawl space moisture is the hidden enemy

Texas humidity plus negative grade turns crawl spaces into rot factories. Termites follow moisture. Replacing joists without a moisture plan is how you buy the same lumber twice. We address grading, French drains, vapor barriers, and ventilation, then the wood. Pair this work with drainage correction when the yard still dumps water toward the stem wall.

After a wet crawl space dries, floors can still need house leveling if piers have already dropped. Shims on rotten wood fail. We replace the member, then relevel. Clay science behind the seasonal swing: expansive clay soil guide.

Our pier and beam process

Crawl-space inspection: moisture, ventilation, beam condition, pier alignment, termite evidence. Written scope with lumber vs shim vs new support called out separately so you can see what you are buying. Repair, then a floor-level check. Most jobs take 2–5 days. Occupants stay. We do not lift an entire house when three joists and two piers will do.

Insurance usually excludes gradual rot and soil movement. Sudden covered water events are a policy question, not a contractor promise. Selling a central San Antonio home? Agents expect crawl-space photos. A written report from a foundation inspection beats a surprise at option period.

What we will not do

We will not quote a slab-style full-perimeter pier package on a house we have not crawled. We will not ignore standing water and sell shims. We will not pretend pressed concrete blocks in a wet crawl space are a long-term fix on active clay. If an independent engineer has already specified members, we can bid that plan. If you need a PE for a dispute or historic review, we will tell you to hire one ($350–$800) instead of stretching a contractor report into a courtroom exhibit.

Termites, rot, and how fast lumber fails

San Antonio crawl spaces that stay above 60 percent relative humidity feed both rot fungi and subterranean termites. You do not always see mud tubes from the living room. The floor just gets bouncier. A joist can lose a third of its section before the finish floor shows a ridge. We probe members, note termite evidence, and separate pest treatment (your exterminator) from structural replacement (us). Treating bugs without replacing eaten wood leaves a house that still sags.

Original 1940s pine in Alamo Heights was never sized for modern point loads: stone islands, clawfoot tubs, tile over oak. When you remodel, tell us. Extra piers or a sistered girder under a new kitchen is cheaper than a cracked tile floor six months later. We would rather add one support now than rebuild a span after the fact.

What a crawl space inspection actually looks like

We measure clearance, photograph every bay we can reach, and map piers that have tilted, crumbled, or punched into wet soil. Shallow historic crawl spaces (under 18 inches) take longer and cost more because a tech is on their side, not walking. If access is blocked by HVAC trunks or old duct board, we say so in the report instead of pretending we saw the whole footprint. You get that honesty in writing within 24 hours, same as a slab survey.

Bring a flashlight if you want to crawl with us. Most owners do not. Point out the room that feels worst. Center-span sag is a different pattern than a street-side drop, and it changes whether we add mid-span supports or only reset perimeter piers. After repair, keep the access door usable. The next inspection in three to five years should not require cutting a new hatch.

If you are buying a 1940s bungalow and the seller already jacked the floors once, bring that invoice. We will crawl anyway. Repeat shimming without moisture work is the pattern we see on Monte Vista resales. A dry crawl space with sound lumber and a recent relevel can be a clean bill. A wet one with fresh shims on rotten beams is a delayed failure. We write that distinction so your option period is based on wood, not hope.

Related guides

• Slab vs pier and beam
• Foundation repair cost in San Antonio
• Signs your foundation needs repair

Call (830) 244-0222 for a free crawl space inspection. Same-day appointments across San Antonio. Written estimate before any work begins.