Last updated October 28, 2026

How to bid septic jobs

What a septic bid has to say, a worked tank replacement price, why the county inspection belongs on the timeline, and the staged payments septic contractors use.

A septic customer has a problem they cannot see and a county inspector they have never met. The bid that wins is the one that explains both: what is wrong, what gets replaced, and when the county shows up. The bid that causes trouble is the one that gives a price and a date and leaves the inspection out, so the customer calls on day three asking why there is a hole in the yard and nobody working in it.

What a septic bid has to answer

What is being replaced or repaired, by component: the tank by size and material, the drain field by length and type, the pump, the distribution box, the risers and lids.
The permit and the county inspection: who applies, how long approval usually takes in that county, and that the hole stays open until the inspector passes it.
Excavation and restoration: what gets dug, where the spoil goes, that the yard is rough-graded and seeded or sodded, and that ruts from the equipment are possible.
Pumping and disposal of the old tank contents, and whether the old tank is crushed in place or removed.
What happens if the soil or the site fails a test, or the field is bigger than the permit assumed.

How to price it

Example numbers for a 1,000-gallon concrete tank replacement, same location, risers to grade, in a typical county. Yours will differ.

Permit and inspection fees: $350, on its own line.
Pump-out of the old tank: $300.
Excavation: mini excavator and operator for a day, $900.
Tank: 1,000-gallon concrete, delivered and set, at cost plus markup, $1,900.
Risers, lids, inlet and outlet baffles, pipe, fittings, gravel bed: $650.
Labor for the crew, connections, backfill, rough grade: two people, two days, $1,400.
Old tank crushed and filled in place: $300.
Total: about $5,800. $6,400 is a common landing once the inspection wait and the margin for a wet site are in it.

Drain fields price by the linear foot of trench plus the pipe, gravel or chambers, and the fabric, with the soil work and the distribution box as their own lines. Aerobic system service prices as a repair visit plus a maintenance contract, and the contract terms go on the bid.

Where septic bids go wrong

The inspection was not on the timeline. The customer thought you walked off the job.
Restoration was not written, and the customer expected a finished lawn where the bid meant rough grade.
The old tank contents were pumped by someone else at the customer's cost, and nobody said so.
The county required a bigger field than the bid priced, and there was no sentence about what happens then.

A finished septic bid, line by line

Three sample septic estimates: septic tank replacement, drain field replacement, and aerobic system service. The septic proposal template is the blank version with the inspection line on the timeline.

Deposit and payment terms

Septic work is paid in stages tied to the inspection, because the inspection is the milestone everyone can see. Half at signing and half on the passed inspection is common on a tank. On a drain field, forty percent at signing, forty at the start of excavation, and the last twenty when the county passes it. The deposit covers the tank order and the permit. Write the stages on the bid with the inspection named, so the final payment is not a conversation.

Getting more septic jobs

Septic customers search at the worst moment, with a backup in the house, and they call the first contractor who answers and the first one who sends a written price. Have the bid out the same day, with the inspection on it, because the inspection is the part they are afraid of. Follow up at three days; a failed system does not wait long. Ask for the review after the inspector passes it, when the relief is real, and ask them to mention the county in the review so the next customer in that county finds you.

BidWriter Pro writes the bid from your notes with the inspection on the timeline and the staged payments spelled out, and the customer signs and pays the deposit from their phone. $29 a month, 30 days free.

Questions contractors ask

How much does a septic tank replacement cost to do?

Permit, pump-out, excavation, the tank at cost plus markup, risers and fittings, crew labor, and crushing the old tank. Many counties land between $4,500 and $9,000 for a 1,000-gallon concrete tank in the same location. Site conditions move it most.

Should the county inspection be on the bid?

Yes, on the timeline and on the payment schedule. It tells the customer why the hole is open and when the last payment is due.

How do septic contractors structure payments?

In stages tied to the inspection: a deposit at signing that covers the tank and permit, a payment at excavation on bigger jobs, and the balance when the county passes it.

Write a septic bid from your notes

Type the job the way you would text it. It comes back as a finished estimate in about five seconds, in your words. No account.

Type a job the way you would text it

Only what you type goes on the estimate. Nothing gets added.

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