How to read a plumbing estimate and compare quotes fairly

Two plumbers look at the same water heater. One estimate is a single line with a number. The other is a page long and the number is higher. Most people pick the first and find out at the end what the second one already knew. Reading an estimate takes knowing what should be on the page and noticing what is missing.

What a good estimate lists

An estimate is a description of a job, not just a price. Look for these, and ask for any that are missing:

• Scope. What exactly is being done, in plain words. “Replace 50-gallon electric water heater in garage, including pan, relief line, expansion tank, and new supply connections” is a scope. “Water heater” is not.
• Materials and brands. The manufacturer and model of anything major, the pipe material, the fitting type. “PEX with expansion fittings” and “CPVC” are different jobs.
• Permits and inspections. Who pulls the permit, and whether its fee is in the number. Water heaters, repipes, sewer work, and backflow devices are permitted in Lee and Collier County. An estimate that says nothing about a permit for permitted work is telling you something.
• Access and patching. Who opens the wall, who closes it, and to what stage: taped, textured, or painted. On a repipe this is a large share of the disruption and it is often the line that quietly gets left off.
• Exclusions. What is not included. Haul-away of the old unit, electrical work, drywall, landscaping over a sewer trench, the unknowns behind the wall. Good estimates say so.
• Warranty. On the labor and on the parts, separately, in months or years, in writing.
• License and insurance. The contractor’s license number on the page, and a willingness to send the insurance certificate if you ask.
• Timing. When the work can start and roughly how long it takes, and what happens to your water during it.

Why the lowest number often leaves something out

A low number is usually not dishonest, just incomplete. One estimate includes the permit, the pan, the expansion tank the inspector will require, and hauling the old heater away. The other assumed the old pan was fine, left the expansion tank for “if needed,” and priced the labor alone. Both are legitimate ways to write the page, but only one of them is the number you will actually pay.

When you see a large gap between two quotes, do not ask which one is cheaper. Ask what the higher one includes that the lower one does not. The answer is almost always in the exclusions, the permit, or the patching.

Flat rate, hourly, deposits, and change orders

Plumbers price in one of two ways. A flat rate names one number for a defined task, and the plumber carries the risk if it takes longer. Hourly billing charges time and materials, and the homeowner carries that risk. Neither is wrong. Flat rate is easier to compare and better for defined jobs like a water heater. Hourly can be fairer for work nobody can scope from the outside, like tracing a leak. What matters is that the estimate says which one it is, and for hourly work, what the rate covers and how materials are billed.

Many plumbers charge a diagnostic or trip fee to come out, look, and give you a number. Ask whether it exists, whether it is credited toward the work if you go ahead, and whether it is a separate line. There is no right answer, only a clear one.

On a larger job, a deposit toward materials before the start is normal. Full payment before any work begins is not, and cash only with no paperwork is a warning. The estimate should say what is due when: at the start, at rough inspection, at completion.

A change order is a written addition to the scope when something turns up that nobody could see: a rotted subfloor under the toilet, a second leak behind the first, cast iron where the drawing said PVC. Ask up front how changes are handled. The answer you want is that no extra work happens until you have seen and approved a written change with its own number. The answer you do not want is that it will all be worked out at the end.

Questions to ask before you sign

• Is this the total, or are there items that could be added?
• Who pulls the permit, and is the inspection included?
• Who patches and finishes the drywall, and to what stage?
• What brand and model is going in?
• What is the warranty on labor, and on the parts, and who do I call?
• What happens if you open the wall and find something else?
• How long will the water be off?
• May I have your license number and a certificate of insurance?

If the work is permitted, the estimate needs a name next to the permit. That is where a homeowner’s involvement ends and the licensed contractor’s begins. An estimate that suggests you pull an owner-builder permit for work the plumber is doing is a red flag on its own.

Red flags

• No license number, or one that does not match the name on the estimate when you look it up.
• Pressure to decide today, especially with a price that goes up tomorrow.
• A verbal quote with nothing in writing, or an estimate on a blank invoice with no company name.
• No mention of a permit for water heater, repipe, sewer, gas, or backflow work.
• Payment in full up front, or cash only.
• A scope that does not name materials, or names “contractor grade” without a brand.

Comparing apples to apples

The only fair comparison is the same scope, in writing, from each plumber. If the quotes differ, send the more complete one back to the other plumber and ask them to match the line items, or ask the first to remove what the second left out so you see the real gap. Once the scopes match, compare the warranty, the materials, the license, and how each one answered your questions. Then the number.

If you have an estimate in hand and something on it is unclear, or two quotes that do not line up, send them to us. We will tell you what is missing from each, what the inspector will ask for, and what a complete scope for your job should say, with no obligation on your end.