A practical slab lift guide for first-year operators

Last updated 2026-08-21

What is slab lift?

Slab lift is paid work that raises a sunken concrete slab by pumping material under it until the panel comes back toward level. You drill a pattern of holes, inject polyurethane foam or a cement slurry, watch a level or a laser, then patch the ports. The slab stays put. You are putting support back, not pouring a new driveway.

Homeowners also search foam jacking, poly jacking, concrete leveling, and mudjacking. Those are methods. They are not different trades. If the slab is already rubble, lift is the wrong repair. Say that on the first visit. A lift on shattered concrete is a callback you will own.

Why the slab dropped is usually soil, not the original mix. A lateral line leaks. A downspout dumps next to the garage. Fill got dumped and never compacted. Clay shrinks after a dry summer. The concrete is a lid. The dirt moved. You cannot stare at that lid as a finished product and ignore what is under it.

Interior slabs, driveways, sidewalks, pool decks, and warehouse floors are the common tickets. Highway undersealing is a public works cousin with different specs and bonding. Do not paste a freeway underseal note into a patio bid.

There is no federal slab lift license. There is no official national price either. You sell square feet, lift height, access, and risk. If a marketing page hands you one number for the whole country, ignore it and measure the job in front of you.

How do you start slab lift?

You start slab lift by building a small construction company, then adding a pump. Confirm the contractor class with the state board or city that actually issues the card. File a business name if your state requires it. Get an EIN from the IRS if you will hire, open certain bank accounts, or just want payroll clean. The IRS is blunt: "Applying for an EIN is a free service offered by the Internal Revenue Service." ^[5]

Pick foam or slurry before you buy iron. Write a hazard communication program for the chemicals you will store. Get liability and auto quotes. Do not promise a start date you cannot staff.

Your first jobs should be exterior flatwork you can photograph and re-level. Skip structural underpinning, floating stairs, and anything tied into a foundation wall until you have a written scope and, if the job needs it, an engineer. That is not timid. That is how you stay in business past June.

Read what a slab lift first year really requires on paper before you print magnets. If your state uses a trade exam, read what the slab lift exam actually tests. The SBA 10-step start guide is a decent federal checklist for registration order. It will not tell you hole spacing. ^[13]

Foam chemistry is also a supply story. Many two-component systems still lean on HFC or HFO blowing agents. EPA's AIM Act phasedown cuts HFC allowances over time, down to a 15 percent baseline cap in 2036. ^[10] Confirm current resin availability with your supplier. Do not assume last year's drum price still exists.

Is foam better than mudjacking for new operators?

For most new operators working interiors and picky HOA driveways, foam wins the customer. It uses small drill holes, expands as it reacts, sits lighter on weak soils, and stays cleaner inside a finished house. Chemical cost is higher, and proportioners are fussy about temperature and ratio.

Mudjacking (slurry) pushes a cementitious mix under the slab through larger ports. The mess is real. Material is cheap and heavy. Used pumps show up on the used market. I would learn slurry first only if you already own a mixer and you plan to live on exterior work. Both methods fail if you miss the void or you over-lift and crack the panel. Over-lift is the amateur tell.

Nobody runs a clean public dataset on residential callback rates by method. Highway undersealing paper is a different load case. Treat manufacturer lifespan claims as marketing until you have your own two-year photo log. Keep the photos.

Method	Typical field look	Better first jobs	Main headache
Slurry (mudjacking)	Larger ports, gray mix	Exterior walks, cheap lifts	Mess, weight, cleanup
Polyurethane foam	Small holes, expanding resin	Interiors, clean driveways	Drum cost, ratio, PPE
Replace the slab	Sawcut and pour	Shattered concrete	Downtime and demo

Hole sizes vary by contractor and kit. Confirm with your pump maker. Do not copy a video grid onto a post-tension slab.

Want a square-foot bid sheet already laid out? SlabLiftPath sells a $149 one-time Mix + Bid-per-Sqft Kit. A legal pad and a chalk grid work the same if you actually measure.

Do you need a license to do slab lift work?

Most places do not sell a card that says slab lift. They license concrete, masonry, foundation repair, or a general contractor class, and lift work rides inside one of those. California's C-8 Concrete classification covers forming, pouring, placing, and finishing flat concrete work. ^[7] Whether lift-only injection fits that class is a question for CSLB, not a blog comment. Ask them in writing and keep the reply.

Florida defines who counts as a contractor in section 489.105, Florida Statutes. The statute reaches the person who, for compensation, "undertakes to, submits a bid to, or does himself or herself or by others construct, repair, alter, remodel..." except as exempted in that part. ^[8] Dollar thresholds and local specialty cards change. Confirm with DBPR and the county that will inspect you.

Texas does not run a statewide general contractor license for most residential trades. Cities still register contractors and pull permits. That pattern shows up in other states too. The desk that cashes the check is the one that matters.

Do not advertise foundation repair if your card is flatwork only. Underpinning and press piles are a different risk pile. If a house has structural movement, send it to someone with the right class and, when needed, a PE.

Fees, application windows, and exam outlines are not stable enough to reprint here. Confirm with the relevant board. No approval timeline is honest if it did not come from that board this week.

See the slab lift guide for licenses, foam, and first jobs if you want the license path sitting next to the chemical path.

What paper do you file before the first paid job?

Before the first paid job you want a legal identity, a way to invoice, and a way to get paid without mixing grocery money. IRS Publication 334 is the small-business tax guide most sole proprietors actually need. ^[6] Census NAICS 238110 (Poured Concrete Foundation and Structure Contractors) is the closest industry code for many of these shops. Use it on forms when they ask for a NAICS. ^[14]

If you hire, you need I-9s, withholding, and a decision about employees versus contractors. The IRS, not your buddy with a truck, draws that line. Misclassification is a boring way to blow year one.

Permits are local. Some cities treat driveway lift as a building permit. Some ignore it until the slab sits in the right-of-way. Right-of-way work is a different desk, often public works, with insurance minimums they publish on the permit form.

Stormwater rules can appear if you disturb enough land. EPA's 2022 Construction General Permit is the federal baseline many states adopt or replace with their own CGP. ^[12] A typical patio lift will not trip acreage thresholds. A large pavement yard might. Read the acreage trigger. Do not guess from a forum.

Keep SDS sheets in the truck. Keep a simple contract: scope, elevation target, what you do not fix (cracks that stay, matching color, landscaping), payment, and access. That paper prevents more fights than a new mixer.

For a longer paper sequence, use a first-year slab lift guide to the real paper path.

What safety rules apply on a real lift day?

Two hazards dominate a lift day: respirable crystalline silica from drilling concrete, and isocyanates in many polyurethane systems. Both have federal rules, and both have killed the shops that shrugged them off.

OSHA sets the construction silica PEL at 50 μg/m3 as an 8-hour TWA, with an action level of 25 μg/m3. ^[1] In 29 CFR 1926.1153, the PEL "means a concentration of airborne respirable crystalline silica of 50 μg/m3, calculated as an 8-hour TWA." Wet methods or a vacuum shroud on the rotary hammer are the usual controls. Guessing is not a control.

Isocyanates (often MDI in two-part foam) can trigger asthma. NIOSH Alert 2006-149 documents asthma and deaths tied to MDI in spray-on applications and related work. ^[4] Slab lift is not truck-bed lining, but the chemistry family is the same. Read your SDS. Use the gloves and respirator the SDS names. A hardware-store dust mask is not a respirator.

Hazard communication is 29 CFR 1910.1200. Labels, SDS, and training are mandatory once you have hazardous chemicals on hand. ^[2] OSHA's construction PPE rule, 29 CFR 1926.95, requires PPE when hazards are present. ^[3] Eye protection while drilling is not a style choice.

Establishments with 10 or fewer employees are partially exempt from routinely keeping OSHA injury and illness records under 29 CFR 1904.1. ^[11] That exemption does not touch silica or HazCom. Training still applies under 29 CFR 1926.21. ^[15]

I would spend more on a half-face respirator program and silica controls than on a truck wrap. A silica citation hurts more than a quiet logo.

What first-year equipment is worth buying?

Buy the smallest complete system that can finish a two-car driveway without a mid-job panic. For foam that means a proportioner that holds ratio when the drums run cold, heated hoses if your winters are real, spare gun parts, and a generator that is not dying. For slurry that means a mixer, a pump, hose, and a way to move sand and cement without wrecking your back.

I would not finance a new custom truck in year one. A used van and a liftgate will do. Drills, bits, levels, a rotary laser, and patch material are the unsexy items that actually run the day. Bits die faster than the ads admit.

There is no federal price list for this iron. Dealer quotes move with heaters, output, and whether the unit is rebuilt. Get three invoices. Rent before you buy if a rental yard in your market has a unit you can try on a real slab.

Skip the branded polo inventory. Skip the wrap until your close rate is real. A clean jobsite photo log is better advertising than a wrap you still owe on.

Read how slab lift works and how operators start year one for the year-one operating sequence next to the shopping list.

How should you bid a slab lift job?

Bid from a measured grid, never a glance from the sidewalk. Mark panels. Measure the drop at corners and midspans. Note thickness if you can see an edge. Note soil that is pumping or voided. Note access: hose length, indoor finish, pets, HOA work hours.

Foam is sold by the pound or by the set, then converted to lift. Slurry is sold by the cubic foot of mix. Your bid is material plus labor plus mobilization plus risk. Interior work costs more because of protection and cleanup, not because the chemistry changed overnight.

I would refuse any bid that only says "level the garage" with no elevation notes. Write the target in inches. Color match on patches is a lie if you do not control the mix and the weather. Put that in writing so the argument happens before the check.

Consumer websites publish huge national ranges. They blend mudjacking, foam, and replacement into one number. Useless for a bid. If you want a regional feel for what homeowners already see, skim a state cost page like slab lift cost in California or slab lift cost in Florida, then still measure your job.

BLS does not track slab lift technician as a separate occupation. Cement masons and concrete finishers are the closest Occupational Outlook Handbook cousin, and median pay on that handbook page sits in the low to mid $50,000s on recent updates. ^[9] Your owner draw is whatever is left after chemicals, fuel, and the job that went wrong.

Which slabs should you turn down in year one?

Turn down shattered slabs. Turn down post-tension slabs unless you know where the cables are and you have a locate. Turn down a house with an active plumbing leak under the slab until the leak is dead. You will lift, they will leak, the slab will drop, and you will get the Saturday call.

Pool decks with hidden plumbing and a thin edge are a nasty first job. So is anything holding a masonry fireplace. Interior slabs with radiant heat are a no until you have a scan and a written waiver. One hit on a tube ends the goodwill.

If the customer wants you to fix the crack, explain that lift restores elevation. Cracks stay. You can fill them. They will read as scars. Put that in the contract so it is not a surprise on walkthrough.

Soft organic soil and peat will keep moving. You can fill a void and still lose grade next winter. Say so, or walk. Walking is cheaper than a refund.

Slab lift mistakes that cost operators their first year is worth a read before you say yes to a simple garage that sits on fill.

What insurance and contracts do you actually need?

You need general liability that names the property owner when they ask, hired or non-owned auto if people use personal trucks, and real commercial auto on the vehicle that carries chemicals. Workers' compensation is a state rule once you have employees, and some states grab you sooner than you think. Confirm that trigger with the state fund or your agent.

I will not print a premium. Anyone who quotes a national GL number on a blog is inventing. Call two independent agents who already write concrete or restoration contractors. Ask about pollution or chemical endorsements. Some GL forms get weird about your work and about fumes.

Contracts need scope, exclusions, a payment schedule, photo permission, and a clause that existing cracks and color variation remain. If you warrant elevation for a period, define the trigger. New settlement from a new leak is not your foam failing.

Do not start interior work on a handshake. The cleanup argument will cost more than the attorney template.

Confirm bond and minimum coverage numbers with the city permit desk when the job is in the right-of-way. Those numbers live on the permit form, not in this article.

How long does a slab lift last?

A well-supported slab can stay put for years if the water problem is dead and the soil is done moving. That is the honest sentence. Foam makers publish long service claims. Independent, public, residential lifespan studies with large samples are thin. I have not seen a federal dataset that tracks patio foam for 20 years.

Highway undersealing has more agency paper, and those slabs live under trucks. Different world. Do not paste a freeway spec into an HOA bid and call it proof.

What voids a lift is usually new water, new load, or a slab that was already broken. Tree roots keep growing. Clay keeps shrinking. Your foam does not fix the downspout. If the gutter still dumps at the corner, you sold a pause, not a cure.

Tell the customer the soil story. Offer a re-check after the first wet season if you want the relationship. Do not promise a lifetime grade on fill.

If they need a new slab, sell a new slab. Lift is the wrong hero on rubble.

How do you confirm local fees and exam rules?

Every fee, exam outline, and processing time in this trade is local. Confirm with the board that prints the license. Confirm permit cost with the city that inspects the driveway. Confirm chemical disposal with the county hazardous waste desk if you have leftover A or B component. Cured foam is usually a different conversation than liquid isocyanate.

OSHA rules above are federal. State-plan OSHA states can be stricter. If you work in a state-plan state, read that state's silica and HazCom page too. Do not assume the federal floor is the whole story.

The SBA registration order is a start. ^[13] It will not list your city business tax receipt. Call the city clerk or business license desk.

I would keep a one-page binder: license copy, insurance dec page, EIN letter, SDS set, and the contract template. That binder gets you through the first HOA vendor packet without a scramble.

Variable facts (fees, quotas, wait times) are omitted here on purpose. Boards change them. Reprinting last year's number is how operators write bad checks.

A later pass through how operators start year one plus the first-year paper guide is enough curriculum. You do not need another motivational video.

Want the bid worksheet bundled? The Mix + Bid-per-Sqft Kit is at /start. This page works if you never click it.

Frequently asked questions

What is slab lift?

Slab lift is the trade of raising a settled concrete slab by injecting polyurethane foam or a cement slurry underneath it. You drill ports, pump until the panel comes back toward level, then patch. It is a support repair, not a new pour. Shattered concrete is usually a replacement job, not a lift.

How do you start slab lift?

Start as a construction business. Confirm the local contractor class, get an identity and an EIN if you need one, set hazard communication for silica and foam chemicals, and quote only jobs you can measure. Buy or rent a complete pump system after you pick foam or slurry. Confirm every fee with the board that issues the card.

Is slab lift the same as mudjacking?

Mudjacking is one slab lift method. It uses a cementitious slurry and larger ports. Polyurethane foam is the other common method, with smaller holes and a lighter fill. Customers use the words as if they mean the same thing. They do not. Bid them as different material, mess, and risk profiles.

Do I need a contractor license for slab lift?

Often yes, but the card rarely says slab lift. States and cities fold the work into concrete, foundation, or general contractor classes. California describes C-8 concrete work on the CSLB classification page. Florida defines contractor in section 489.105. Confirm the class in writing with the board that will cash your application.

How much does slab lift cost per square foot?

There is no official national per-square-foot schedule. Consumer sites blend foam, slurry, and full replacement into one range, which makes the number useless for a bid. Price your material, labor, access, and lift height on a measured grid. Regional homeowner pages can show what people already see, then you still measure.

Is polyurethane foam safe to use under a house?

Cured foam is inert in ordinary use. Liquid components can include isocyanates such as MDI, which NIOSH has tied to asthma in related applications. Follow the SDS for gloves, ventilation, and respirators. Keep occupants and pets out of the work area until the installer says the set is done. Read the sheet, not a forum.

What OSHA rules apply when drilling concrete for slab lift?

Drilling concrete creates respirable crystalline silica. OSHA's construction standard 29 CFR 1926.1153 sets a PEL of 50 μg/m3 as an 8-hour TWA and an action level of 25 μg/m3. Use wet methods or a shrouded vacuum. PPE and hazard communication still apply even if you are a tiny shop.

Can I run slab lift as a sole proprietor?

Yes, many first-year operators do. IRS Publication 334 is the tax guide that matches that setup. You still need local licenses, a contract, and insurance customers will accept. If you hire, payroll and classification rules show up fast. An EIN is free from the IRS if you want one or a bank requires it.

Will slab lift fix cracks in the concrete?

No. Lift restores elevation by filling voids and adding pressure. Existing cracks usually stay visible. You can fill them, and they will still read as scars. Write that exclusion into the contract. If the slab is broken into loose pieces, replacement is the honest repair.

Do I need an engineer on a slab lift job?

Not on a simple exterior walk with a clear drop. Yes when the slab is structural, tied to a foundation wall, holding a fireplace, or sitting on a post-tension system you cannot locate. If the house is moving, stop selling lift and send the owner to the right class of contractor and, when needed, a PE.

How many holes do you drill for slab lift?

There is no single code number. Spacing follows the pump, the slab thickness, and where the void actually sits. Foam grids are usually tighter than people expect. Slurry ports are larger and fewer. Confirm a pattern with your equipment maker. Do not copy a video onto a slab you have not sounded.

Does leftover foam chemical count as hazardous waste?

Liquid A and B components often do, which is why you talk to the county hazardous waste desk before you guess. Cured foam is usually a different waste conversation. EPA generator categories depend on how much hazardous waste you produce in a month. Do not pour leftover isocyanate on the ground or into a dumpster.

When should a new operator take interior slab lift jobs?

After you can hold ratio, protect finishes, and write a cleanup scope people will sign. Interiors punish sloppy hose handling. Radiant heat and finished wood next to the slab are easy ways to blow a job. Start outside. Move inside when your photo log shows clean patches and on-grade results.

Is there a national slab lift exam or card?

No. Licensing is state and city work. Some boards test a concrete or contractor class that happens to cover this scope. Exam outlines and fees change. Confirm both with the board that prints the card. A manufacturer training day is useful for the gun. It is not a license.

Sources

1. OSHA 29 CFR 1926.1153 Respirable crystalline silica: Construction silica PEL is 50 μg/m3 as an 8-hour TWA and the action level is 25 μg/m3.
2. OSHA 29 CFR 1910.1200 Hazard Communication: Employers with hazardous chemicals must maintain labels, safety data sheets, and employee training.
3. OSHA 29 CFR 1926.95 Criteria for personal protective equipment: Construction employers must provide and require PPE when hazards are present.
4. NIOSH Alert 2006-149 Preventing Asthma and Death from MDI Exposure: NIOSH documents asthma and deaths associated with MDI exposure in spray-on and related applications.
5. IRS Apply for an Employer Identification Number (EIN) Online: Applying for an EIN is a free service offered by the Internal Revenue Service.
6. IRS Publication 334 Tax Guide for Small Business: Publication 334 is the IRS tax guide for small businesses including sole proprietors.
7. CSLB C-8 Concrete contractor classification: California's C-8 classification covers forming, pouring, placing, and finishing flat and other concrete work.
8. Florida Statute 489.105 Definitions: Section 489.105 defines a contractor as a person who, for compensation, undertakes, bids, or performs construction or repair work except as exempted.
9. BLS Occupational Outlook Handbook, Cement masons and concrete finishers: BLS publishes current median pay for cement masons and concrete finishers, the closest published occupation to slab lift field work.
10. U.S. EPA Frequent Questions on the Phasedown of Hydrofluorocarbons: The AIM Act HFC phasedown reduces allowance caps in steps, reaching a 15 percent of baseline cap in 2036.
11. OSHA 29 CFR 1904.1 Partial exemption for employers with 10 or fewer employees: Establishments with 10 or fewer employees are partially exempt from routinely keeping OSHA injury and illness records.
12. U.S. EPA 2022 Construction General Permit (CGP): The 2022 CGP is the federal construction stormwater permit baseline that states adopt or replace.
13. U.S. Small Business Administration 10 steps to start your business: SBA publishes a 10-step federal checklist for registering and launching a U.S. business.
14. U.S. Census Bureau NAICS 2022 details for 238110: NAICS 238110 is Poured Concrete Foundation and Structure Contractors.
15. OSHA 29 CFR 1926.21 Safety training and education: Construction employers must instruct each employee in the recognition and avoidance of unsafe conditions.