● Sinking Foundation Repair · Phoenix Metro
Sinking Foundation Repair in
Phoenix, AZ
When one side of your home drops lower than the rest, get an inspection-first plan to stabilize and level it before the cracks get worse.
Sinking foundation repair in Phoenix starts with figuring out exactly why one side of your slab or stem wall has dropped lower than the rest — and whether it can be lifted back to level. Phoenix’s expansive clay soil swells and shrinks hard between monsoon downpours and long dry stretches, and that movement is the leading cause of a foundation that sinks unevenly instead of settling straight down.
Not every sinking foundation needs the same fix. Some settlement is old and stable; other cases are active and getting worse by the week. We start with an inspection that measures how far out of level your home actually is, then recommend real options — concrete leveling, stem wall repair, or crack stabilization — based on what’s actually happening under your slab, not a one-size-fits-all pitch.
Why Is My Foundation Sinking on One Side?
A foundation that sinks unevenly — one corner or one side of the house dropping while the rest stays put — is called differential settlement, and it behaves differently than a slab that settles evenly across its whole footprint. In Phoenix, three things usually cause it: expansive clay soil that swells when it gets wet during monsoon season and shrinks hard when it dries out again, soil washout from a leaking irrigation line, a broken sewer pipe, or grading that channels water against the foundation, and poor compaction under part of the slab from the original build. Any one of these can pull the soil out from under a section of your stem wall or slab while the rest of the house stays fully supported.
How Phoenix soil drives uneven settlement
Valley soil isn’t uniform lot to lot, or even corner to corner on the same lot. A pocket of expansive clay near one footing swells and pushes up during a wet monsoon, then shrinks and drops away once it dries out — and that repeated cycle is what turns a level foundation into a sinking one over several seasons. Homes built on fill soil, or sited near a slope that sheds water toward one side of the house, tend to see this fastest.
Signs to Act Now
- Widening cracks — A stair-step crack in block or brick that keeps getting wider, or a slab crack you can slide a coin into, means the settlement is still active.
- A visibly sloping floor — Set a marble or a level on the floor — if it consistently rolls toward one wall, that side of the foundation has already dropped.
- Doors and windows binding — Interior doors that stick, won’t latch, or need constant planing are often the first sign a sinking foundation is racking the frame around them.
- New gaps at baseboards or the ceiling line — A gap opening between the baseboard and floor, or the wall and ceiling, usually points to the same corner that’s pulling down.
Can a Sinking Foundation Be Lifted Back to Level?
In many cases, yes. Once we confirm the settlement has stopped moving or can be stabilized, a sunken slab section can often be raised back toward level using concrete leveling — injecting structural polyurethane foam or a cement-based grout underneath the low area to lift it and fill the void the settlement left behind. A dropped stem wall or footing is a different repair; that gets addressed with stem wall repair and, where the soil is still shifting, deeper stabilization work rather than a straight lift.
What we won’t do is promise a full lift on every house. If settlement is still active, or the drop is severe enough that lifting risks new cracking elsewhere in the slab, we say so in the written estimate and lay out the more conservative option — stabilize first, then reassess whether leveling makes sense afterward.
How We Assess and Fix a Sinking Foundation
Every sinking foundation gets an inspection before we talk about a fix — never a phone-quoted number.
Inspection & elevation survey
We measure how far out of level the slab or stem wall actually is and identify the source of the movement — clay soil, water intrusion, or poor compaction.
Source control first
If a leaking line, broken drain, or bad grading is feeding the soil movement, we flag it before any leveling work starts — lifting a slab over an active leak just buys a repeat problem.
Stabilize and level
Depending on what’s under your home, we stabilize the affected area and, where the soil supports it, lift the settled section back toward level with concrete leveling or targeted stem wall repair.
Written estimate & documentation
You get a written estimate covering the scope, materials, and price range before any work begins — no verbal-only quotes.
Sinking Foundation Repair Cost in Phoenix
Cost depends on how much of the foundation moved and how it needs to be repaired.
Foundation repair pricing nationally runs about $2,200 to $8,100, averaging near $5,200, and Phoenix jobs generally land in that same range depending on scope. A single-corner concrete leveling job with foam injection sits toward the low end; a sinking stem wall that needs structural stabilization across a longer run costs more, since it involves more material and labor. The real driver is the square footage of the affected area and how deep the fix needs to go, not a flat per-house rate. We measure your specific settlement during the inspection and put the number in writing before any work starts.
Ask for a written estimate rather than a phone-quoted price — a sinking foundation is one repair where guessing the scope over the phone gets it wrong.
Not sure if your foundation is still sinking?
Book an inspection and get a written estimate that tells you whether the movement has stopped and what it takes to level it.
Why Phoenix Homeowners Choose Us
- Honest about what can and can’t be lifted — if a full lift isn’t the safe call for your house, we say so instead of overselling the fix.
Preventing Future Settlement Around Your Foundation
Most repeat sinking-foundation calls in Phoenix trace back to water, not soil alone. Keeping irrigation heads and drip lines away from the foundation, extending downspouts well past the stem wall, and regrading any spot where water pools against the house during monsoon season all reduce the swelling and shrinking that drives differential settlement. If your home already has a foundation crack or an anchor bolt issue tied to past movement, addressing the water source first protects whatever leveling or stabilization work gets done.
Recent Sinking Foundation Projects
Concrete leveling on a sunken corner slab
Stem wall stabilization after monsoon soil movement
Foam injection leveling on a sloping living room floor
Frequently Asked Questions
Uneven settlement almost always comes down to soil movement under just part of the house — expansive clay swelling and shrinking through monsoon season, soil washout from a leaking line or bad grading, or a pocket of poorly compacted fill soil from the original build. Whatever’s under the low corner is giving way faster than the soil under the rest of the house.
Often, yes, once the movement has been assessed and either stopped or accounted for. A settled slab is typically raised with concrete leveling — foam or grout injected underneath the low area. A dropped stem wall needs stem wall repair and stabilization instead. We’ll tell you honestly during the inspection whether a full lift is realistic for your specific settlement.
Foundation repair nationally runs about $2,200 to $8,100, averaging near $5,200, and Phoenix pricing generally falls in that range depending on how much of the foundation moved and what repair it needs. You’ll get an exact number in a written estimate after the inspection, not a phone quote.
In most cases, yes. Concrete leveling and stem wall repair are typically completed in a day or two per area, and homeowners stay in the house during the work. We’ll tell you upfront if a particular project needs you to stay clear of a specific room while material cures.
Almost every house settles a small, even amount in its first few years, and that’s normal. A sinking foundation is different — it’s uneven, with one side or corner dropping noticeably more than the rest, and it usually keeps getting worse until the underlying soil or water issue is addressed.
● Related Services
Other Foundation Repairs We Handle
Broader settlement diagnosis and repair for foundations moving anywhere on the slab, not just one corner.
Foam and grout injection to lift a sunken slab section back toward level.
Fixing sloping or bouncy floors caused by foundation movement underneath them.
● Where We Work
Serving The Phoenix Metro
Get a Written Estimate on Your Sinking Foundation
Book an inspection and find out exactly what it takes to stabilize and level your foundation.