Prep is the trade, and prep is what customers do not think they are buying. The setting is the visible part and the fast part. Flatness, moisture, waterproofing and movement joints are where the money and the liability both live, and a price built on square footage of tile with the substrate assumed to be fine is a price that turns into a callback. The most litigated mistake in tile work is a missing or discontinuous waterproof membrane, and it surfaces months later. Here is what to price.
Start with the stack
Labor, payroll burden, materials, a share of overhead, then profit as its own line: How to price your work so you actually make money and What Should I Actually Charge?. Below is the flooring and tile part.
Price the substrate, not the square footage
The same square footage of tile is three different jobs depending on what is underneath. That means your quote has to state what it assumes and price the alternatives.
Flatness. Large-format tile needs a flatter substrate than standard tile, and floor leveling or patching to achieve that is real material and real time. A floor that looked acceptable to the eye can need a great deal of work before a large-format tile will lay without lippage.
Moisture. A concrete slab that has not been tested is a risk, not an unknown you can price around. An untested wet slab needs a moisture mitigation system or an uncoupling membrane, and a failure here takes the whole floor up. Say in the quote whether testing is included and what happens if the slab fails it.
Movement joints. Every large installation needs them, and leaving them out is one of the standard causes of a floor that cracks or tents later. They are in the price or they are in the failure.
What is already there. Removal, adhesive residue, old thinset, and whether the existing floor or the layers under it contain asbestos. That last one is not optional to check on older buildings, and it is excluded until tested. Lead and asbestos in older buildings has the rule, and grinding old adhesive or cutting tile brings the silica standard with it: The silica standard: Table 1, the PEL, and when you need air monitoring.
Most of the reasons tile cracks or comes loose after installation are prep failures rather than tile failures: a substrate that was not flat enough, a slab that was too wet, or missing movement joints. That is exactly why the prep has to be in the price and in writing rather than absorbed to win the job.
Waterproofing is a specification, and it is where claims come from
A continuous waterproof membrane is required behind tile in all wet and shower areas. Cement board and grout are not waterproofing, and a customer or a general contractor who thinks otherwise needs to be told before the job rather than after.
This is the single most litigated mistake in tile work, because a discontinuous membrane leaks weeks or months later, long after the tile looks perfect and long after you have been paid. Quote the membrane system by name, price it as a line, and never let it be the thing that comes out to meet a number.
Coverage and workmanship standards you can point at
The TCNA Handbook is the industry installation standard, and it is what a specifier, an inspector or an expert will measure your work against.
The figure worth knowing when pricing is mortar coverage: at least 80 percent in dry areas and at least 95 percent in wet and exterior areas, verified by pulling a tile and looking at the back. Achieving that reliably means the right trowel, the right technique, back-buttering where required, and time. A price that assumes coverage happens for free is a price built on a standard you cannot meet.
Being able to name the standard is also a sales asset. It is a concrete answer to "why is yours more", and that conversation is How to explain your price when they say "that's a lot".
Material, waste and layout
Tile and flooring waste is not a flat percentage. Diagonal layouts, patterns, herringbone, large-format, and cut-up rooms all raise it, and so does a customer choosing a tile with directional variation. A stated waste allowance in the quote, with the number, stops the argument about who pays for the extra box.
Two more material rules that save real money:
- Order from one lot. Shade and caliber vary between production runs, and a mid-job top-up from a different lot is a visible fault that is not your workmanship.
- The customer supplying the tile is a common arrangement and a common problem. They order the exact square footage from the drawing, which is less than the job needs, and the shortfall becomes your delay. Materials: who supplies, who pays, and getting it in writing is the clause set, including that you do not warrant what you did not supply, and Material Quantity Sanity Check is the check before anybody orders.
Licensing and the credential that opens commercial work
No state licenses individual tile setters or floor installers, so as an employee no personal license is needed. Running your own jobs brings the usual state project-value threshold, above which a general or specialty contractor license is generally required. Do I Need a Contractor License? has yours.
The credential that matters commercially is the CTEF Certified Tile Installer, the only hands-on skills test for tile setters. It is not a license, and commercial specifiers and general contractors look for it because it proves you can set tile to standard rather than just say so. If you want commercial work, it is worth having, and its cost belongs in overhead.
Labor burden and the comp class
Employer FICA at 7.65 percent, unemployment tax, general liability and workers comp put labor burden in the usual construction range of 30 to 50 percent on top of the wage. What does a worker actually cost me per hour once they are on the books? has the example. Comp is a rate per $100 of payroll by class code times your experience mod, and flooring and tile sit in the lower to middle part of the construction range, with the knees, the lifting and the dust being the trade's real long-term costs rather than the premium. Your body is your livelihood. Protect it for the long haul. is the guide that matters most in this trade over twenty years.
What belongs in a flooring or tile quote
- The substrate assumption, stated: flat to a named tolerance, dry, sound and structurally adequate.
- Whether moisture testing is included, and what happens if the slab fails.
- Floor preparation and leveling, priced separately or with a stated allowance.
- The waterproofing system by name in every wet area.
- Movement joints, in the price.
- Removal and disposal of the existing floor, and asbestos excluded until tested.
- The waste allowance as a number, and that shortfalls on customer-supplied material are theirs.
- Layout and pattern, because diagonal and patterned layouts are more labor and more waste.
- Trims, thresholds, transitions and edge profiles, which are always assumed included.
- Grout type and sealing, and any maintenance the warranty depends on.
- Furniture moving, appliance disconnection and door trimming, which customers assume and rarely say.
Where to go next in this section
- How to price your work so you actually make money, the stack underneath.
- How to price concrete and masonry work, because a slab that is not flat or not dry starts here.
- How to price drywall work, the other trade priced on a spec level.
- Materials: who supplies, who pays, and getting it in writing, for customer-supplied tile.
- How to become a flooring and tile installer, for the standards and the CTI in full.
- Construction warranties explained, because in this trade the failure arrives late.
Common questions
How should I price tile work, by the square foot or by the job?
Either, as long as the price is built on the substrate rather than on the tile area. The same square footage is a different job over a flat, dry, sound floor than over one that needs leveling, moisture mitigation or a full waterproofing system, and it is different again with a large-format tile that demands a flatter substrate than standard tile. So price the prep explicitly, state in the quote what condition you assumed the substrate to be in, and give the alternatives a price. Square-foot pricing that quietly assumes perfect prep is the most common way a tile job loses money.
Do I really need to waterproof behind shower tile?
Yes. A continuous waterproof membrane is required behind tile in all wet and shower areas, and cement board and grout are not waterproofing. This is the most litigated mistake in tile work because a missing or discontinuous membrane leaks weeks or months later, long after the tile looks perfect and long after you have been paid. Quote the membrane system by name and price it as a visible line item, so it is never the thing that quietly comes out to meet somebody else's number. If a general contractor or a homeowner pushes back, that conversation belongs before the work, in writing.
Why does tile crack or come loose after installation?
Usually because of the prep rather than the tile. The common causes are a substrate that was not flat enough for the tile size, a concrete slab that was too wet and was never tested, and missing movement joints on a large installation. Mortar coverage matters too: the standard is at least 80 percent in dry areas and at least 95 percent in wet and exterior areas, verified by pulling a tile and checking the back, and achieving that reliably takes the right trowel, the right technique and time. All of those are costs, which is exactly why they have to be in the price rather than absorbed to win the job.
What waste allowance should I quote for tile?
Not a single flat percentage, because waste depends on the layout. Diagonal and patterned layouts, herringbone, large-format tile and cut-up rooms all raise it, and so does a tile with directional variation that has to be sorted. State the allowance as a number in the quote so the extra box is not an argument later, and order from a single production lot, because shade and caliber vary between runs and a mid-job top-up from a different lot is a visible fault that is not your workmanship. If the customer is supplying the tile, say in writing that shortfalls are theirs.
Is CTI certification worth getting?
For commercial work, yes. The CTEF Certified Tile Installer credential is the only hands-on skills test for tile setters, and commercial specifiers and general contractors look for it because it demonstrates you can actually set tile to standard rather than simply claiming it. It is not a license and it is not required to trade. Treat it as a credential that opens a class of work and supports a higher price, carry its cost in your overhead, and use it in the conversation about why your quote is not the lowest one.
The honest bit
- There are no dollar rates here, per square foot or per hour. Flooring and tile pricing varies by material, layout, substrate condition and market.
- The 80 percent and 95 percent mortar coverage figures and the waterproofing requirement are as recorded in this site's own trade guide, and the TCNA Handbook is the authority for a specific installation. Check the method for the assembly you are actually building.
- Whether flooring or tile work needs a contractor license, and the project-value threshold, are state questions.
- Asbestos in old flooring, adhesive and backing is a real risk in older buildings and testing is the only way to know. Never assume.
- Workers comp class codes and rates are set per state and per carrier.
- This is general guidance, not legal, tax or financial advice.
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