Can You Lift a Sunken Patio or Pool Deck? What It Costs and How Long It Takes?
Yes. A settled patio or pool deck can almost always be lifted back to grade with polyurethane foam rather than torn out and repoured, as long as the concrete itself is still sound. A typical residential patio lift in the Twin Cities runs $1,200 to $3,000 and takes about two hours, and you can walk on it the same afternoon. Pool decks cost the same to lift but often need the deck-to-coping joint resealed afterward, since that joint is usually what let the water in to begin with.
Key Takeaways
- Lifting a patio costs roughly 25 to 50 percent of what replacing that same slab costs, and there is no color mismatch afterward because the original concrete stays.
- Most patio and pool deck lifts are finished in about two hours, with no curing period before the surface can be used.
- Polyurethane foam does not absorb water, compress, or wash away, so the freeze-thaw cycle that settled the slab has no effect on the repair material.
- Lifting only works if the concrete is still sound -- a slab that has broken into several loose pieces needs replacement instead.
- Redirecting the water that caused the settlement is what keeps a lifted patio from dropping again.
Yes, a Sunken Patio Can Be Lifted Instead of Replaced
Most homeowners assume a settled patio means demolition, a dumpster in the driveway, and a week of their backyard being a construction site. That is usually not the case.
If the slab is still structurally sound -- meaning it has not broken into several loose pieces and the surface is not crumbling -- it can be raised back to the correct elevation and left in place. The concrete is not the problem. The soil underneath it is.
Patios settle for the same reason driveway aprons and sidewalks do. Water works its way under the slab, carries fine soil particles away, and leaves a void -- an empty pocket between the bottom of the concrete and the dirt. Once that void opens up, the slab has nothing supporting its weight and it drops into the space.
Why Patios and Pool Decks Settle Faster Than Other Concrete
Backyard slabs sit in the worst possible spot for water exposure, and they usually get less attention than the concrete out front.
A patio typically sits directly against the house, which means it catches roof runoff along its entire back edge. If the gutters overflow or a downspout empties nearby, that water goes straight into the soil under the slab. Many patios were also poured over backfill -- the loose soil pushed back into the trench after the foundation went in -- which never reaches the density of undisturbed ground and keeps settling for years.
Pool decks have a second water source that patios do not: the pool itself. Splash-out, backwash discharge, and rain that sheets off the deck all concentrate at the same joints year after year. When the joint between the deck and the coping opens up even slightly, water runs directly beneath the slab every time someone gets out of the pool.
Then Minnesota gets involved. Frost regularly drives three to four feet deep in the Minneapolis metro, and the Twin Cities see roughly 100 degrees of temperature swing between summer and winter. Water in the soil freezes, expands, lifts the slab slightly, then thaws and lets it drop again -- and not always back to where it started. Every cycle makes an existing void a little larger. This is why a patio that looked fine in September is noticeably uneven by the following May.
What Lifting a Patio or Pool Deck Actually Involves
The process is short, and there is almost nothing to clean up afterward.
- Small ports are drilled through the slab, each about the size of a dime.
- High-density polyurethane foam is injected through the ports. It expands beneath the concrete, fills the void completely, and then begins to lift.
- The lift is monitored in real time with a level, and injection is adjusted port by port until the slab sits at the correct elevation and drains away from the house or the pool.
- The ports are patched with cement grout.
- The joints are sealed so water stops running into the space below.
There is no excavation, no heavy equipment crossing your lawn, and no curing period. The foam reaches its working strength within about 15 minutes. Patio furniture goes back the same day.
For pool decks, the sequence is the same with one addition. The deck-to-coping joint gets resealed as part of the job, because lifting a pool deck without addressing that joint leaves the original water path wide open.
What It Costs to Lift a Patio or Pool Deck
Most residential patio and pool deck lifts in the Twin Cities fall between $1,200 and $3,000, which is roughly 25 to 50 percent of what tearing out and repouring the same slab costs. What moves the number is square footage, how far the slab has to travel, and how many separate sections are involved. For a full breakdown of what drives the price and what a complete quote should include, see what it costs to lift a patio or pool deck in the Twin Cities.
The comparison that matters is not foam versus some other lifting method. It is lifting versus replacement, because that is the actual decision in front of you.
| Lifting With Polyurethane Foam | Tearing Out and Repouring | |
|---|---|---|
| Typical cost | $1,200 to $3,000 | Two to four times the cost of lifting |
| Time on site | About two hours | Several days, plus demolition and hauling |
| Use the surface again | Same day | Seven days minimum after the pour |
| Yard disruption | Dime-sized holes, patched | Equipment across the lawn, dumpster, debris |
| Appearance | Your existing concrete, unchanged | New concrete will not match adjoining slabs |
| Pool downtime | None | Pool typically unusable during the work |
| The void underneath | Filled completely | Filled only if the base is properly compacted |
That last row is worth pausing on. Replacing a slab without addressing the void and the drainage puts new concrete on the same unstable soil that failed the first time.
When Lifting Is Not the Right Answer
Sometimes replacement is the honest recommendation, and a contractor should be willing to say so.
Lifting is the wrong call if the slab has broken into several loose sections that move independently, if the surface is spalling badly and flaking apart, or if the concrete is so thin it cannot carry a lift without cracking. A patio with one crack running through an otherwise solid slab is a routine lift. A patio that has crumbled into a jigsaw puzzle is not.
The honest test is whether you are looking at a slab that dropped or a slab that failed. A slab that dropped can be raised. A slab that failed has to be replaced.
What to Fix at the Same Time So It Does Not Settle Again
Lifting the slab solves the symptom. Keeping water out from under it solves the cause. Two things are worth handling alongside the lift.
Redirect the water. If a downspout empties within a few feet of the patio, it is pouring water directly into the soil beneath it. An extension carrying that discharge six to ten feet away removes the single largest source of erosion under a backyard slab.
Seal the joints. The joint where the patio meets the house, and on a pool deck the joint between the deck and the coping, should be sealed with a flexible caulk. An open joint is a funnel pointed straight at the soil you just stabilized.
A lifted patio with drainage corrected and joints sealed is a repair that holds. A lifted patio with a downspout still dumping alongside it will eventually settle again, and no foam can prevent that.
Frequently Asked Questions
My patio has sunk and pulled away from the house. Can that be lifted back?
Yes, and that is one of the more common versions of this job. The slab is raised back to the correct elevation and re-sloped so water runs away from the foundation instead of collecting against it. The gap along the house is sealed afterward so water stops getting back underneath.
Will lifting my pool deck damage the pool shell or the plumbing?
No. The foam is injected only under the deck slab and expands into the void beneath it, and the lift is monitored continuously so the concrete rises evenly and stops at the right elevation. The pool structure sits on its own support and is not affected. Lines running under the deck are located before any ports are drilled.
How long does a lifted patio last?
The foam itself does not break down, compress, or wash away, so the material is not what limits the lifespan. What determines it is whether the water that caused the settlement has been redirected. With drainage corrected and joints sealed, a properly lifted patio holds for many years.
Can you lift just the sunken section, or does the whole patio have to be done?
Just the settled section in most cases. Patios are usually poured in multiple sections separated by control joints, and those sections settle independently. There is no reason to lift concrete that is already sitting level.
What if my patio is pavers or stamped concrete instead of a plain slab?
Stamped concrete lifts the same way a plain slab does, and the pattern and color are preserved since the original surface stays in place. Pavers are a different situation, since they are individual units over a base rather than a single slab, and they are usually reset rather than lifted. Send a photo and you will get a straight answer on which one you have.
Is summer a bad time to do this, or should I wait until fall?
Summer is a fine time and it is when most homeowners notice the problem, since that is when they are actually using the patio. The practical window in the Twin Cities runs from spring thaw through late fall, and because the job takes about two hours you are not giving up your backyard for the season to get it done.
If your patio or pool deck has settled, cracked at the joints, or started draining toward the house instead of away from it, Benchmark Concrete Raising can lift it back to grade in about two hours using polyurethane foam, and you can use it that same afternoon. We work throughout the Minneapolis metro, including Edina, Plymouth, St. Louis Park, Bloomington, Minnetonka, Eden Prairie, and Maple Grove. Send us a photo of the settled area and we will give you an honest assessment and a ballpark number before we ever show up.
