How Much Does Polyurethane Foam Injection Cost?

Updated on August 30, 2026 | Written by Alec Pow
This article was researched using 11 sources. See our methodology and corrections policy.

Polyurethane foam injection for concrete lifting typically costs about $5 to $25 per square foot in 2026. A 100-square-foot sunken slab can work out to roughly $500 to $2,500, while a 300-square-foot repair can run about $1,500 to $7,500. Small jobs may cost more per square foot because contractors often apply a minimum service charge.

Those prices describe polyjacking, where expanding polyurethane foam is injected beneath a settled concrete slab to fill voids and raise it. They should not be applied automatically to leaking foundation cracks, bowed foundation walls, deep soil stabilization, or structural underpinning. Those are different repair problems with different pricing methods.

The real bill is driven by the amount of concrete being treated, the volume of void beneath it, how far the slab must move, site access, whether the slab supports part of a structure, and the contractor’s minimum charge. Two 100-square-foot patios can require very different amounts of foam.

Article Highlights

• Current polyurethane concrete lifting prices run about $5 to $25 (at $30 per hour, earning that amount would take about 10 to 50 minutes, before taxes) per square foot.
• HomeGuide reports contractor minimums of roughly $300 to $700 or more, which can make small repairs expensive per square foot.
• A 300-square-foot polyjacking project works out to about $1,500 to $7,500 using the broad current range.
• Mudjacking is cheaper at roughly $3 to $6 per square foot, but it uses a heavier cementitious slurry instead of lightweight expanding foam.
• Polyurethane crack injection, deep soil injection, slab lifting, and structural foundation repair should not be priced as the same service.
• For small damaged sections, concrete replacement can sometimes compete with polyjacking once contractor minimum charges are included.

How Much Does Polyurethane Foam Injection Cost?

Polyurethane repair	Current cost	What changes the total
Polyjacking / slab lifting	$5 to $25 (about 10 to 50 minutes at $30 per hour) per sq. ft.	Area, access, lift required, void size
25 sq. ft. repair	$125 to $625 before minimums	Contractor minimum may control the invoice
100 sq. ft. repair	$500 to $2,500	Slab type and access
300 sq. ft. repair	$1,500 to $7,500	Foam volume and lifting difficulty
500 sq. ft. repair	$2,500 to $12,500	Large voids can increase material use
Typical contractor minimum	$300 to $700+	Company and market

The broad $5 to $25 per square foot benchmark comes from Angi’s July 2026 polyjacking data. Its location examples put accessible sidewalk lifting near $5 per square foot, patios and pool decks around $10, basement floors around $20, and some slab-foundation work near $25 per square foot.

HomeGuide’s 2026 polyjacking data uses a slightly narrower $8 to $25 per square foot range and reports that many contractors charge a minimum of $300 to $700 or more. Its project estimates put a 100-square-foot sidewalk around $800 to $2,500 and a 450-square-foot driveway around $3,600 to $11,300.

A-1 Concrete Leveling reports a much broader $750 to $6,000+ range for residential concrete-leveling jobs across several methods in its current concrete repair pricing. Foam injection sits toward the expensive side of leveling because the polyurethane material costs more than traditional grout.

What You’re Buying

Polyjacking repairs concrete that has settled while the slab itself remains suitable for lifting. A contractor drills small injection holes through the slab and places polyurethane beneath it. The two-component material reacts and expands below the concrete, filling open space and applying controlled upward pressure.

Contractors inject in stages rather than filling the entire area at once. The amount needed depends on what exists below the slab. A shallow gap beneath a sidewalk may consume relatively little material. A washed-out area or deep void under a driveway can consume much more even when both slabs have the same surface area.

Structural polyurethane products can use very small holes. One documented slab-lifting application from polyurethane manufacturer Alchatek used approximately 3/8-inch injection holes and a two-component structural foam system. Product specifications and contractor methods vary.

Once the target elevation and support are reached, the holes are patched. This is different from pouring new concrete because the existing slab remains in place.

The Minimum Charge

Small repairs expose one of the least obvious polyjacking costs. The nominal square-foot price can become almost irrelevant when it falls below the contractor’s minimum.

Take a 25-square-foot sunken sidewalk section priced notionally at $10 (about 20 minutes at $30 per hour) per square foot. The calculated work is only $250. If the contractor has a $700 minimum, the homeowner still pays $700. The effective price becomes $28 per square foot.

Now apply the same $10 per square foot rate to 200 square feet. The calculated price is $2,000, well above the minimum. The effective rate returns to the quoted $10 per square foot.

This is why a neighbor’s price is often a poor comparison for a tiny repair. Mobilizing the truck, crew, proportioning equipment, hoses, drilling equipment, and polyurethane system costs money before much foam has been injected.

A published contractor example shows an even larger minimum. Dalinghaus Construction has described a regional pricing system in Southern California and Arizona with a $2,500 minimum and $10 per square foot for shallow void fill or flatwork beyond the area covered by that minimum in its polyurethane pricing example. The company states that its $2,500 minimum covers the first 250 square feet under that pricing model.

Using its published formula, a 300-square-foot void-fill job has 50 square feet beyond the included area. Fifty multiplied by $10 equals $500. Add that to the $2,500 minimum and the worked total becomes $3,000. This is one contractor’s regional pricing method, not a national 2026 rate.

What Pushes the Invoice Higher

Surface area is only the visible half of the job. Foam consumption happens below the concrete. A slab sitting half an inch above competent soil is a different repair from one bridging a large washed-out cavity.

Access also matters. An exposed driveway or sidewalk gives the crew room to drill and run equipment. Interior floors, basement slabs, finished areas, and structural slabs can involve more setup and restoration. Angi currently estimates an extra $100 to $400 for some flooring restoration after lifting structural or finished interior slabs.

The amount of lift can change the job as well. Bringing one edge of a sidewalk up a fraction of an inch is easier to control than correcting several areas that settled to different elevations.

Drainage repairs may sit outside the polyjacking quote. If erosion, poor grading, leaking drainage, or another site problem created the void, lifting the concrete without correcting that cause can leave the property exposed to more soil movement.

Cosmetic work can be separate too. Polyjacking raises concrete but does not make old slabs look new. Existing cracks, stains, scaling, surface wear, and mismatched sections remain unless resurfacing or other concrete work is purchased separately.

Foam Lifting Is Not Foundation Repair

The word “polyurethane” appears in several construction services that should never share one generic price range.

Polyjacking injects expanding foam beneath a slab to fill voids and raise settled concrete. Driveways, sidewalks, garage floors, patios, pool decks, and some floor slabs are common applications.

Void filling uses polyurethane to fill unsupported space below concrete but may involve little or no intended lifting.

Deep polyurethane injection sends material farther into weak soil to densify or stabilize it. Dalinghaus publishes $160 per linear foot for its own deep-injection system and says the method is aimed primarily at soil stabilization rather than large lifts in its deep injection pricing explanation. The contractor states it cannot confidently produce more than roughly one-half to one inch of lift with that method.

Polyurethane crack injection is different again. A contractor injects material into certain foundation cracks, often to control water entry rather than raise a slab. Current foundation crack repair pricing puts epoxy or polyurethane crack injection around $400 to $1,500 per crack.

A bowing wall, major settlement, active structural movement, or failed foundation can call for reinforcement, piers, underpinning, drainage work, or another engineered repair. It should not be priced by multiplying the wall length by a generic foam-injection rate.

Polyjacking vs Replacement Scenarios

Small sidewalk case: A 100-square-foot sidewalk falls within roughly $500 to $2,500 using Angi’s polyjacking range. New 100-square-foot sidewalk construction currently runs about $800 to $1,200, while removing existing concrete adds roughly $2 to $6 per square foot, according to 2026 sidewalk cost data. That creates a replacement example around $1,000 to $1,800 before unusual site work. For a very small slab, replacement can compete with foam once minimum charges enter the repair bid.

Driveway case: A 200-square-foot settled portion of driveway works out to approximately $1,000 to $5,000 at $5 to $25 per square foot. Full driveway replacement currently runs around $8 to $20 per square foot before project-specific extras, according to Angi’s 2026 driveway data. Lifting becomes attractive when most of the existing concrete remains sound and only settlement needs correction.

Mudjacking comparison: Traditional mudjacking currently costs about $3 to $6 per square foot. At 300 square feet, that equals about $900 to $1,800, while polyurethane at $5 to $25 works out to $1,500 to $7,500. Angi’s current mudjacking description identifies the injected material as a cement slurry. It is not simply liquid concrete pumped below the slab.

Those prices do not prove that mudjacking is the correct choice whenever it is cheaper. Foam is much lighter than cementitious grout and can be useful where adding material weight to weak soil is undesirable. The contractor still needs to identify why the slab settled and which lifting material fits the site.

Replacement is the cleaner comparison when concrete has severe deterioration rather than simple settlement. A slab with widespread failure does not become new concrete after it is raised. Money spent lifting material that soon needs demolition can turn the cheaper repair into the expensive choice.

When Foam Injection Makes Sense

Makes sense if:

• The concrete slab remains in usable condition but has settled or developed an elevation difference.
• The problem involves voids or loss of support beneath otherwise repairable flatwork.
• A contractor can identify a practical lifting target without overstressing the slab.
• Replacement would require substantial demolition and reconstruction of sound concrete.

Does not make sense if:

• The slab is extensively broken, spalled, or deteriorated and needs replacement anyway.
• The problem is a bowing foundation wall being treated as though it were a sunken sidewalk.
• The underlying drainage or soil problem remains active with no repair plan.
• A structural problem requires piers, reinforcement, engineering, or another repair that foam alone cannot provide.

Polyurethane installation is also professional chemical work. Isocyanates are raw materials used in polyurethane production, and OSHA states that occupational exposure can cause skin and mucous-membrane irritation, breathing difficulties, occupational asthma, and other lung problems in its isocyanate hazard information. Exposure controls and installer PPE belong to the contractor’s work procedure rather than a homeowner DIY experiment.

What We Verified

• Checked: current 2026 pricing places polyurethane concrete lifting at about $5 to $25 per square foot rather than treating $3 to $40 as the main national range.
• Confirmed: contractor minimum charges can control the cost of small jobs and HomeGuide currently reports minimums around $300 to $700+.
• Cross-referenced: mudjacking uses a cementitious slurry rather than the old article’s claim that contractors simply pump concrete below the slab.
• Verified: structural foundation repairs, deep soil injection, crack injection, void fill, and slab lifting have different scopes and should receive separate prices.
• Checked: OSHA identifies uncured isocyanate exposure as an occupational health hazard requiring appropriate workplace controls.

Related Concrete Costs

The machinery behind commercial polyurethane work is far removed from a small canned-foam project, which is why the cost of a professional spray foam rig is not a useful shortcut for estimating a homeowner’s polyjacking invoice.

Replacement quotes create a different set of line items. Fresh concrete delivery costs become relevant when the old slab is being repoured, while concrete removal costs can make replacement substantially more expensive than the new concrete price alone.

Answers to Common Questions

How much does polyurethane concrete lifting cost per square foot?
Current pricing is about $5 to $25 per square foot. Small jobs can exceed that effective rate because many contractors have minimum service charges.

How much would it cost to polyjack 300 square feet?
Using the current broad range, 300 square feet works out to about $1,500 to $7,500. Void depth, access, amount of lift, and local contractor pricing can move the quote within or outside that range.

Is polyurethane lifting cheaper than replacing concrete?
It often can be when the slab remains sound and a large area only needs leveling. Small jobs with high contractor minimums can sometimes cost as much as replacing a limited section.

Is polyurethane foam the same as mudjacking?
No. Polyjacking uses expanding polyurethane. Mudjacking pumps a heavier cementitious slurry beneath the slab. Current mudjacking pricing is roughly $3 to $6 per square foot.

Can polyurethane foam fix a sinking house foundation?
Some polyurethane systems are used for slab support, void filling, or soil stabilization, but major structural settlement can require piers, underpinning, reinforcement, or another engineered repair. A generic polyjacking price should not be applied to structural foundation work.