Last updated 2026-08-20
TL;DR
Slab lift raises a settled concrete slab toward grade by pumping polyurethane foam or cementitious grout underneath. You start by confirming your state's contractor class, forming a business, getting a free IRS EIN, lining up insurance the work triggers, and training on silica and isocyanates. There is no national license. Confirm class, bond, and fees with the board that issues the card.
What is slab lift?
Slab lift is the work of raising a settled concrete slab back toward grade by pumping material into the void under it. The slab stays. You drill, inject, watch a level or laser, then patch the holes. Most crews use expanding polyurethane foam or a cementitious grout people still call mudjacking mix.
That is the job. Driveway. Patio. Sidewalk. Warehouse aisle. Pool deck. Soil washed out or compacted, the slab dropped, and the owner wants it usable again without a tear-out.
It is not piering. It is not a new foundation. If the slab is rubble, or a live plumbing leak is still cutting soil out from under it, a lift is a short-lived trick. Fix water first. I walk from those more often than I regret it.
Highway shops have jacked pavement slabs for a long time. Same physics on a house slab. Different contract, different license questions, and a much less patient homeowner.
Foam is light. Grout is heavy and cheap per pound. Foam needs a proportioner and real respect for isocyanates. Grout needs a mixer and a crew that will not blow a slab by pumping like they are filling a pothole. Both fail when you miss a void or ignore drainage. Nobody has a clean national study on residential callback rates. Track your own.
The Census Bureau's 2022 NAICS definition for poured concrete foundation and structure contractors (238110) covers establishments that pour and finish structural concrete, which is the nearest federal industry box many slab lift shops file under when they also do related concrete work. Confirm how your accountant maps you. [14]
How do you start slab lift?
You start slab lift by confirming the contractor class or registration your state and city actually use, forming a legal business, getting a free IRS EIN, buying insurance that matches drilling and injection work, and training the crew on silica and isocyanates. There is no federal slab lift card. A foam vendor weekend is not a license.
Do this in order. I would not buy a rig first.
Read the statute, then call the board. California treats most paid construction as licensed work. Florida defines who counts as a contractor in statute. Washington makes you register before you advertise. Other states leave more of it to cities. Confirm every class and fee with the board that would fine you. Do not trust a forum thread.
Pick a business form on paper. The U.S. Small Business Administration walks through sole proprietorship, partnership, LLC, and corporation on its Choose a business structure page. [7] I would form an LLC if I planned to hire or own a truck. Then get an EIN. The IRS says, "Applying for an EIN is a free service offered by the Internal Revenue Service." [8] Anyone charging you for the number itself is selling a line at the front of a free queue.
Write a safety program you will actually run. You will cut concrete and, if you run foam, handle diisocyanates. Then price coverage. See what a first slab lift policy usually asks before you bid a driveway.
Last, a way to bid by the square foot with a real mix cost. Equipment after you know what you can legally sell.
Is slab lift the same as mudjacking?
Mudjacking is one way to do slab lift. It is not the only way. Mudjacking pumps a cementitious slurry under the slab through larger holes. Polyurethane slab lift pumps a two-part foam through smaller holes. Both are slab lift if the point is to raise the panel.
Crews argue about this like it is a moral issue. It is a material choice. Grout is familiar and heavy. Foam is lighter and faster to traffic in many mixes, and it costs more per pound of lift. I would keep grout in the toolkit for thick exterior slabs on a budget, and foam where added weight is a bad idea or access is tight. That is a job call, not a brand religion.
Hole size, cure time, and unit price vary by mix and equipment. I will not print fake "industry standard" minutes. Read the technical data sheet for the product in the machine that day. If a salesperson will not hand you the SDS and the TDS, do not put that drum on a driveway.
OSHA's hazard communication rule still applies when you bring those chemicals onto a site. You need the SDS, labels, and training for the hazards they list. [3] Foam A and B sides are not "just plastic."
If a customer says mudjacking and you sell foam, say that out loud in the proposal. Same for the reverse. Change orders start as vocabulary fights.
Do you need a contractor license for slab lift?
Often yes, and the only honest answer is the class your state board (and your city) name for paid concrete repair. There is no national slab lift license. A manufacturer certificate does not replace the card.
California is blunt. Business and Professions Code 7028 says, "It is a misdemeanor for a person to engage in the business or act in the capacity of a contractor within this state without having a license therefor." [9] CSLB's C-8 Concrete classification covers forming, pouring, placing, and finishing specified concrete work, which is the class many concrete repair shops start from. Confirm with CSLB whether your exact scope sits in C-8 or another class. Boards move work between classes. [15]
Florida defines "contractor" in section 489.105, Florida Statutes, as the person who, for compensation, undertakes to, submits a bid to, or does the construction or repair work described in that chapter. [10] Whether your slab lift scope needs a certified or registered license is a board question. Confirm it before the first flyer.
Washington requires contractor registration before you advertise, offer to work, submit a bid, or perform work as a contractor (RCW 18.27.020). [11] Registration is not the same as a trade exam in every state, but it is still paper you need.
Some states do not issue a statewide general construction license and push this to cities or to a short list of trades. If your state works that way, the city building department and the state contractor board still both get a phone call. Never invent a processing time. Boards change queues.
| Place | What you confirm | Primary paper |
|---|---|---|
| California | License class for paid concrete repair | BPC 7028; CSLB class (often C-8) |
| Florida | Whether your scope is contracting under ch. 489 | Fla. Stat. 489.105 |
| Washington | Registration before you advertise or bid | RCW 18.27.020 |
| Federal | EIN if the IRS treats you as needing one | IRS EIN application |
What paper do you file in year one?
Year-one paper is boring and it is what keeps you from getting shut down on a Tuesday. Entity formation with your state. EIN from the IRS (free). A contractor license or registration if your board requires one. Local business tax or city contractor registration where that exists. A written hazard communication program. A silica plan if you drill or grind. A respirator program if you require respirators. Insurance certificates. An SDS binder that matches what is on the truck.
OSHA requires construction employers to instruct each employee in the recognition and avoidance of unsafe conditions (29 CFR 1926.21). [5] That is a training file, not a motivational poster.
If you have employees, add payroll accounts, workers compensation where your state mandates it, and I-9s. If you do not have employees and you are borrowing cousins, you still have a classification problem. Talk to someone who prepares construction payroll, not a motivational coach.
Keep the bid, the signed scope, the elevation notes, and the photos. Slab lift arguments are about whether the slab was "level enough" and whether a new crack was already there. A phone photo dated before injection is worth more than a paragraph of adjectives.
Sales tax treatment of repair labor varies by state. Confirm with your state revenue department. I would not copy another crew's invoice language.
Bond and license renewal dates belong on a calendar, not in your head. For how certificates and additional-insured requests actually show up on these jobs, read certificate requests on slab lift jobs.
What equipment does a first slab lift crew actually buy?
A first crew needs a way to drill, a way to inject, a way to measure elevation, and PPE that matches the dust and the chemistry. That can be a trailer rig. It does not have to be a new truck with a wrap.
I would not finance an $80,000 showpiece in month one. Rent or buy used until the calendar is full of repeatable exterior slabs. Lasers and a good hammer drill get more work done than a vinyl decal.
Foam means a proportioner, heated hose, and clean drums. Grout means a mixer, pump, and a crew that will clean it. Mixing both methods in year one is how people own two dirty systems and master neither. Pick the work you can sell, then buy that system.
Drilling concrete makes respirable crystalline silica. OSHA's construction silica rule sets a PEL of 50 μg/m3 as an 8-hour TWA and an action level of 25 μg/m3. [1] That drives water, vac, and sometimes respirators. It is not optional because the driveway is "just a small job."
Skip the custom trailer paint. Skip the drone you will not fly on every job. Buy extra drill bits and a second laser. For mobile equipment and job-site coverage questions that follow the truck, see truck and rig coverage for slab lift.
What insurance do slab lift operators carry?
Most operators carry general liability, and they add commercial auto the day a truck exists. Workers compensation arrives when you have employees, and in some states sooner. Inland marine or a tool floater covers the proportioner that is not bolted to a building. Pollution or contractor's pollution coverage comes up once a broker hears "isocyanate" and "injection under a slab."
I cannot quote your premium. Anyone who publishes a national "average GL cost for slab lift" is guessing. Confirm with a broker who has written concrete specialty contractors, then confirm the exclusions yourself.
Read the residential work exclusion, the EIFS-style wrap exclusions that sometimes swallow coatings, and any absolute pollution exclusion. Foam is a chemical product. Your certificate is not a hug from the insurer.
Do not sell a "lifetime warranty" your policy will not fund. Write a workmanship period you can stand behind in cash.
Start with general liability for slab lift crews and what slab lift insurance actually asks. If a GC wants you named as an additional insured on a warehouse floor, read additional insured wording that shows up on lift jobs before you say yes in an email.
How much does it cost to start a slab lift outfit?
There is no honest national startup number. Used proportioners, trailers, drills, lasers, PPE, deposits on insurance, license and registration fees, and the cash you need to survive a slow month all move with city and with how fancy you insist on looking.
I will not invent a package price. Confirm license fees with the board. Confirm insurance deposits with a broker. Confirm used iron by looking at actual machines, not a guru's launch funnel.
Labor is a real line. The BLS Occupational Outlook Handbook publishes median pay for construction laborers and helpers and updates it on a set schedule. Use the current median on that BLS page when you model a helper, not a group-chat wage. [12] Your market may sit above or below it.
The waste is buying the brand-new rig before the license, then parking it while a bond processes. Paper first. Iron second.
Hold a cash reserve for callbacks. You will have one. Budget mix you already paid for and a half-day of labor. That reserve is more useful than a conference ticket.
What safety rules hit polyurethane and drilling crews?
Two hazards run this trade. Dust from drilling and grinding concrete. Diisocyanates in many foam systems. Treat both as real on day one.
OSHA's construction silica standard says the employer shall ensure that no employee is exposed to an airborne concentration of respirable crystalline silica in excess of 50 μg/m3, calculated as an 8-hour TWA. [1] The action level is 25 μg/m3. Table 1 in that rule lists specified exposure control methods for many common tasks. Read the table before you invent a method.
PPE in construction is not a suggestion. 29 CFR 1926.95 requires protective equipment for eyes, face, head, and extremities, plus respirators when they are needed, to be provided, used, and maintained. [2] If you require respirators, you inherit a program under 29 CFR 1910.134, including medical evaluation and fit testing where that rule says you must. [4]
NIOSH asked for help on this chemistry decades ago. The NIOSH Alert on diisocyanates states that NIOSH requests assistance in preventing asthma, other respiratory diseases, and death from occupational exposure to diisocyanates. [6] That sentence is still the point. Sensitization is not a myth you outgrow.
EPA has a TSCA risk management page for MDI and related diisocyanates that is worth a read before you store drums in a rented bay. [13] Local fire officials sometimes care about that bay too.
Train, then document the training. A toolbox talk that never happened will not help you. For how insurers treat chemical and dust claims after the fact, see claim patterns that follow slab lift jobs.
How do you bid slab lift without guessing?
Bid the square feet you will actually inject, the depth you can defend, access, and the patch count. Then add mobilization. Do not copy a per-square-foot number from a national ad and hope your soils match theirs.
Walk it. Sound it. Look for irrigation leaks and downspouts dumping at the corner that dropped. If the slab is holding water against a house wall, your lift will not fix the house. Price a walk-away.
Build a mix cost per pound or per board-foot of rise from the drums you really buy, not the brochure yield. Weather, substrate temperature, and void shape eat yield. I assume I will not get the pretty number on the sell sheet. If I do, that is margin, not a plan.
A notebook with mix cost, labor hours, and a simple bid-per-sqft sheet is enough. SlabLiftPath sells a $149 one-time Mix + Bid-per-Sqft Kit if you want that sheet already laid out. You can also rule a legal pad. The work is the costing, not the logo on the form.
Write the finish elevation in the proposal. "Look better" is not a spec. "Match adjacent slab within a stated tolerance" is a spec you can argue about like an adult.
If a property manager wants a one-year warranty, price the revisit. Free lifetime language is how small crews go broke on a slab they lifted in year one and babysit until year six.
What first-year spending is a waste of money?
National lead-gen contracts that own your reviews. A new truck wrap before the license posts. A "certification" sold as if it were a state card. Lifetime warranties. Buying both a foam plant and a grout plant in the same quarter. A second helper you do not have hours for.
I would spend on bits, lasers, PPE, and a broker who will actually read your foam SDS. I would not spend on a launch event.
Be careful with exclusive territories sold by material vendors. Read the termination clause. If you cannot leave without shipping drums back at your cost, that is not a partnership.
Office software can wait. You can invoice from a clean template in year one. You cannot invoice your way out of an unlicensed citation.
If someone promises a quota of jobs or a fixed approval date from a licensing board, they are selling a story. Boards do not work for them. Confirm processing with the board only. No vendor can promise the card lands on schedule.
Where does slab lift sit versus full foundation repair?
Slab lift raises a panel. Foundation repair (piers, brackets, wall anchors) is a different product with different engineering, different failure modes, and often a different license conversation.
If doors are racking, if a brick veneer is stepping, if you see shear cracks that keep growing after a rain, stop selling a driveway trick as a house solution. I would bring a structural engineer when the building is the patient. Confirm whether your state even lets you offer that scope on your current card.
Interior house slabs with plumbing in or under the slab are a different animal than a floating garage apron. Camera the lines or require the owner to. Pumping foam into a broken sewer is a special kind of bad day.
Public sidewalks add ADA and city spec issues. A lift that leaves a lip can fail an inspection you did not know you were sitting. Ask the city for the sidewalk spec before you bid municipal work.
Keep the two businesses mentally separate even if one truck does both later. Your insurance applications should say what you actually do. See how applications treat foundation versus slab lift.
How do you confirm the rules in your state?
Call the contractor board and ask three things. What class covers paid slab jacking or polyurethane injection under existing slabs. Whether a city license sits on top of the state card. What bond, if any, that class needs. Then ask the city building department the same three questions. Write down the names.
Read the statute yourself. Florida's contractor definition is in 489.105. [10] California's unlicensed contracting rule is in BPC 7028. [9] Washington's registration trigger is in RCW 18.27.020. [11] Your state has an equivalent page. If you cannot name it, you are not ready to advertise.
Confirm fees on the board's fee page the week you apply. I will not print a fee here. They change.
Confirm insurance minimums the same way. Some cities want a certificate at a stated limit before they issue a local registration. That number lives on their form, not in this article.
SlabLiftPath is an independent publisher, not a law firm and not a service company. If you want the optional bid worksheet, it is on /start. The board still wins every argument about the card.
When a certificate or limit question comes back from a city clerk, limits language that clerks actually ask for is a reasonable next read.
Frequently asked questions
What is slab lift?
Slab lift is raising a settled concrete slab toward grade by pumping polyurethane foam or cementitious grout under it through drilled holes, then patching those holes. The slab stays in place. It is void fill and lift, not a new foundation and not piering. Fix water and drainage first or the slab will drop again.
How do you start slab lift?
Confirm the contractor class or registration with your state board and city, form a business, get a free IRS EIN, buy insurance that matches drilling and injection, and train on silica and isocyanates. Buy equipment after the paper path is real. A vendor class is not a license. Confirm every fee with the board. No one can honestly promise approval timing.
Is foam better than mudjacking?
Not always. Foam is lighter and often uses smaller holes. Cement grout is heavier and usually cheaper per pound of material. Choose based on access, added weight, and the TDS for the product you will pump that day. Ask for the SDS. If the seller will not provide it, walk.
Do I need a PE stamp to lift a driveway?
Most residential exterior slabs do not start with an engineer. Houses with ongoing structural movement, public work with a stated spec, or a GC who wrote a PE requirement into the subcontract are different. When the building is the patient, hire the engineer. Confirm stamp rules with the board and the building official on that job.
Can a one-person crew start slab lift?
Yes on small exterior slabs if you already have the license path, insurance, and a safe way to handle drums, hoses, and traffic. Injection plus a level is easier with two people. I would not run occupied-warehouse floors alone. Hire help for traffic control before you hire help for Instagram.
Do I need hazmat papers to haul foam drums?
Sometimes. It depends on the product's shipping description, quantity, and packaging on the SDS and the 49 CFR shipping rules. Read the SDS transport section and confirm with the carrier or a hazmat consultant. Do not assume a pickup-truck run is exempt because the job is local.
How long before you can drive on a lifted slab?
It depends on the material, temperature, and the TDS. Some foams take traffic quickly. Cement grouts often need more time. I will not invent a universal hour count. Write the reopen time in the proposal from the product data, then add margin for cold slabs.
Can I work from a garage in year one?
Maybe for paper and small tool storage. Drums, isocyanates, and a running proportioner change what a landlord and a fire official will allow. Check zoning, the lease, and local fire rules before you park chemicals next to a water heater. A cheap storage unit with the right occupancy is less painful than an eviction.
Is slab lift the same as piering?
No. Slab lift fills voids and raises a panel. Piering supports or lifts a foundation element on deeper bearing. Different tools, different failure modes, and often a different license conversation. Do not sell piers as a driveway special, and do not sell foam as a fix for a rotating foundation wall.
What hole size do crews drill?
Foam crews often drill smaller holes than classic mudjacking crews, but the diameter is a means, not a moral standard. Follow the equipment and the mix. Patch quality is what the owner sees. State the patch method in the proposal so you are not arguing about color match after the truck leaves.
Do city sidewalk jobs need extra paper?
Usually. Right-of-way permits, traffic control, and an ADA or city lip spec show up on public walks. Ask the city for the sidewalk spec before you bid. A lift that leaves a trip edge can fail inspection even if the panel is higher than it was. Private driveways are simpler paper.
How should a workmanship warranty be written?
Write a defined period, a defined revisit, and a clear exclusion for new soil movement, plumbing leaks, and owner drainage changes. Avoid lifetime language your insurer will not fund. Keep pre-job photos. A short written warranty you honor beats a poster slogan you cannot price.
Sources
- OSHA 29 CFR 1926.1153 Respirable crystalline silica: Construction silica PEL is 50 μg/m3 as an 8-hour TWA; action level is 25 μg/m3.
- OSHA 29 CFR 1926.95 Criteria for personal protective equipment: Construction employers must provide, use, and maintain PPE including eye, face, head, extremity protection and respirators when needed.
- OSHA 29 CFR 1910.1200 Hazard communication: Hazard communication requires SDS, labels, and training for chemical hazards on the job.
- OSHA 29 CFR 1910.134 Respiratory protection: A written respirator program, including medical evaluation and fit testing where required, applies when respirators are required.
- OSHA 29 CFR 1926.21 Safety training and education: Construction employers must instruct each employee in recognizing and avoiding unsafe conditions.
- NIOSH Alert DHHS (NIOSH) Publication 96-111: NIOSH requests assistance in preventing asthma, other respiratory diseases, and death from occupational diisocyanate exposure.
- U.S. Small Business Administration, Choose a business structure: SBA outlines sole proprietorship, partnership, LLC, and corporation as common business structures.
- IRS, Apply for an Employer Identification Number (EIN) online: Applying for an EIN is a free service offered by the Internal Revenue Service.
- California Business and Professions Code section 7028: Unlicensed contracting in California is a misdemeanor under BPC 7028.
- Florida Statutes section 489.105 (2023): Section 489.105 defines who is a contractor for compensation, bidding, and repair work under Florida construction licensing law.
- Revised Code of Washington 18.27.020: Washington requires contractor registration before advertising, offering to work, bidding, or performing contractor work.
- BLS Occupational Outlook Handbook, Construction laborers and helpers: BLS publishes and updates median pay for construction laborers and helpers on the Occupational Outlook Handbook page.
- U.S. EPA, Risk management for MDI and related diisocyanates: EPA maintains a TSCA risk management page for methylene diphenyl diisocyanate (MDI) and related diisocyanates.
- U.S. Census Bureau, NAICS 238110 (2022): NAICS 238110 covers establishments primarily engaged in pouring and finishing concrete foundations and structural elements.
- CSLB, C-8 Concrete classification: CSLB describes the C-8 Concrete class as forming, pouring, placing, finishing, and installing specified concrete work.