Concrete Raising & Leveling: The Complete Contractor's Guide (2026)

Concrete raising (also called slab jacking, mudjacking, or foam lifting) is one of the highest-value services a concrete contractor can offer. With $26-75 average CPC on related keywords — the highest in our entire concrete keyword universe — this is a service homeowners are desperately searching for and willing to pay premium prices. The combined search volume for concrete raising keywords exceeds 17,000 monthly searches, and the market is growing as aging infrastructure creates more sunken slabs.

What Is Concrete Raising?

Concrete raising is the process of lifting sunken, settled, or uneven concrete slabs back to their original position. Instead of demolishing and replacing the slab (expensive, disruptive, time-consuming), raising injects material underneath the existing slab to lift it back into place.

Think of it like this: the concrete itself is usually fine — it's the ground underneath that failed. Soil erosion, poor compaction, water washout, tree root decay, and freeze-thaw cycles all cause voids under slabs. Raising fills those voids and lifts the slab. Problem solved without demo.

The Two Main Methods

1. Mudjacking (Traditional)

Mudjacking has been around since the 1930s. The process drills 1-2 inch holes through the slab, then pumps a slurry (usually a mix of sand, cement, water, and sometimes topsoil) underneath to fill voids and lift the concrete.

Cost: $3–$6/sq ft

Lift capacity: Can raise slabs up to 8 inches or more

Cure time: 24-48 hours before vehicle traffic

Hole size: 1-2 inch diameter (visible but can be patched)

• Pros: Lower cost, proven technology, can raise heavy slabs, widely available
• Cons: Heavier material adds weight to already weak soil, larger drill holes, longer cure, can be messy, slurry can wash out over time

2. Polyurethane Foam Jacking (Modern)

Foam jacking uses expanding polyurethane foam injected through 5/8-inch holes. The foam expands to fill voids, hardens in 15 minutes, and is waterproof. It's lighter (2-4 lbs/cu ft vs 100+ lbs/cu ft for mudjack slurry), so it doesn't add significant weight to weak soil.

Cost: $5–$25/sq ft (higher end for deep lifts and commercial)

Lift capacity: Up to 4-6 inches (multiple injection points for larger lifts)

Cure time: 15-30 minutes (foot traffic immediately, vehicle traffic in 30 min)

Hole size: 5/8 inch (barely visible, easy to patch)

• Pros: Lightweight (doesn't overload soil), waterproof, fast cure, tiny holes, precise control, clean process, long-lasting
• Cons: More expensive, equipment cost is higher ($15,000-$50,000 for a foam rig), foam is irreversible (can't be removed), environmental concerns with polyurethane

Mudjacking vs Foam: Head-to-Head

When to Raise vs When to Replace

Not every sunken slab can or should be raised. Here's the decision framework:

RAISE when:

• The slab is structurally sound (no major cracks, not broken into pieces)
• Settlement is less than 8 inches
• The cause of settlement can be addressed (drainage fixed, erosion stopped)
• The slab is thick enough to drill without breaking (minimum 3.5-4 inches)
• Cost savings matter — raising is 50-75% cheaper than replacement
• Speed matters — foam jacking is done in hours vs days for replacement

REPLACE when:

• The slab is badly cracked, broken into multiple pieces, or crumbling
• Settlement exceeds 8-10 inches (raising this much risks cracking the slab)
• The underlying soil problem can't be fixed (active sinkhole, major drainage issue)
• The slab is too thin (<3 inches) and will crack during lifting
• The client wants a different size, shape, or finish anyway

Common Applications

Residential

• Driveways: The #1 residential raising job. Settlement at the garage apron is extremely common as the backfill behind the foundation settles
• Sidewalks: Trip hazards from tree roots or soil settlement. Municipalities sometimes require homeowners to fix public sidewalk trip hazards — creating demand
• Pool decks: Settling around pools is universal (disturbed soil during pool installation)
• Patios: Drainage problems cause soil washout under patios, especially at the house junction
• Garage floors: Interior raising — foam jacking is preferred (clean, fast, no heavy equipment inside)
• Stoops and steps: Front stoops settle away from the foundation, creating a gap and trip hazard

Commercial

• Warehouse floors: Uneven floors damage forklifts and create safety hazards. Foam jacking handles large areas fast
• Parking lots: Settled slabs create ponding water and trip hazards — liability concerns drive urgency
• Loading docks: Settlement at dock edges creates gaps that damage goods and equipment
• Airport aprons and taxiways: High-value foam jacking jobs — airports can't close runways for weeks

Starting a Concrete Raising Business

Option 1: Mudjacking (Lower Barrier to Entry)

Startup investment: $15,000–$30,000

• Mudjacking pump: $5,000–$12,000 (used units available for $3,000-$5,000)
• Mixing equipment: $1,000–$3,000
• Core drill: $500–$1,500
• Truck/trailer: $5,000–$15,000 (if you don't have one)
• Materials for first jobs: $500–$1,000

Option 2: Foam Jacking (Higher Investment, Higher Margins)

Startup investment: $35,000–$75,000

• Foam rig (proportioner + gun + hoses): $15,000–$40,000
• Initial foam inventory: $3,000–$5,000
• Core drill: $500–$1,500
• Training/certification: $1,000–$3,000 (some suppliers include free training with equipment purchase)
• Truck/trailer setup: $10,000–$20,000

Revenue potential: A solo operator with a foam rig can complete 3-5 residential jobs per day. At an average of $1,500/job, that's $4,500-$7,500/day gross revenue. Material cost is typically 20-30% of the job price, labor is your time, and the rest is profit. A well-run foam jacking business can generate $500K-$1M+ annual revenue with 40-60% gross margins.

Marketing Concrete Raising Services

With 9,900 monthly searches for "concrete raising near me" and $29.78 CPC, there's enormous demand and companies are spending heavily on ads. Here's how to capture this market:

• Google Business Profile: Critical — "concrete raising near me" triggers map results. Get reviews from every job
• Before/after photos: Concrete raising has the most dramatic before/afters in construction. A 3-inch trip hazard leveled flat is visually compelling
• Free inspection offers: "Free concrete assessment — we'll tell you if raising will work or if you need to replace." Low-pressure, high-conversion
• Realtor partnerships: Home inspections flag uneven concrete. Be the contractor realtors recommend for pre-sale fixes
• Municipal contracts: Cities need sidewalk leveling programs. One contract can provide steady work for months
• Insurance company relationships: Water damage claims often include concrete leveling. Be the adjuster's preferred contractor

Technical Process: Step by Step

Foam Jacking Process

1. Assessment: Check slab condition, measure settlement (use a straightedge and level), identify the cause of settlement, check for underground utilities
2. Drill injection holes: 5/8" holes through the slab at strategic points (typically every 3-5 feet in a grid pattern). Avoid drilling near edges (within 6 inches) — risk of cracking
3. Inject foam: Insert injection port into hole, inject foam in short bursts. Watch for slab movement with a laser level or transit. Lift slowly — rapid lifting can crack the slab
4. Level: Use a straightedge and level to verify the slab is even. Fine-tune with additional small injections as needed
5. Patch holes: Fill drill holes with non-shrink grout, color-matched to the existing concrete
6. Clean up: Sweep any foam that seeped out, clean the work area. The slab is ready for traffic in 15-30 minutes

Concrete Raising Cost Calculator

Frequently Asked Questions

How long does concrete raising last?

Mudjacking lasts 5-10 years on average (the slurry can wash out over time). Foam jacking lasts 10-20+ years because the polyurethane is waterproof and won't erode. Both can potentially last the life of the slab if the underlying drainage issue is fixed.

Is concrete raising worth it vs replacement?

Almost always, yes. Raising costs 50-75% less than replacement, takes hours instead of days, and the slab doesn't need to cure (foam jacking is usable in 15 minutes). The only time replacement wins is when the slab itself is severely damaged.

Can you raise a cracked concrete slab?

It depends. Hairline cracks — yes, raising works fine. Large cracks (1/4"+) or slabs broken into multiple pieces — usually no. The slab needs to be intact enough to lift as one unit. If it's broken into 3+ pieces, replacement is usually better.

Does insurance cover concrete raising?

Sometimes. If the settlement was caused by a covered event (plumbing leak, sudden soil collapse), homeowners insurance may cover it. Normal settling over time is typically NOT covered. Municipal sidewalk programs may cover public sidewalk repairs.

How much foam does it take to raise a slab?

Roughly 1 pound of foam per square foot per inch of lift. A 100 sq ft slab that needs 2 inches of lift requires about 200 lbs of foam. At $3-5/lb for two-component polyurethane, that's $600-$1,000 in material for a $1,500-$2,500 job.

Related Resources

• Concrete Repair Guide — Fix cracks, spalling, and surface damage
• Concrete Crack Repair Cost — Pricing for common crack repairs
• Foundation Cost Guide — New foundation pricing and considerations
• Concrete Slab Calculator — Calculate replacement cost for comparison
• How to Bid Concrete Jobs — Include raising as a service in your bids