How to Compare Septic Quotes

Most homeowners compare septic quotes by looking at the totals. That is the one comparison that cannot be made reliably, because the totals describe different work.

The method below normalises the quotes first. It takes about twenty minutes and it routinely finds differences worth far more than that.

Step one: make sure everyone is solving the same problem

Before comparing anything, confirm that each quote addresses the same defined finding. If contractor A is pricing a distribution box replacement and contractor B is pricing a field rebuild, the numbers are not comparable — and one of them may be wrong about the diagnosis.

If you do not have a written finding, get one. Then reissue the same finding to each contractor and ask them to price against it.

Step two: build a scope grid

Put the quotes side by side and mark each line as included, excluded or unstated. "Unstated" is the column that matters — it is where surprises come from.

Line item	Why it matters
Locating the system	Can be the largest variable on an older property.
Uncovering buried access points	Frequently charged separately.
Tank size assumed	Pumping is priced by volume.
Both compartments serviced	A partial pump is a partial job.
Baffle, tee and filter inspection	Silent field damage starts here.
Measurements and written report	Without it you have a receipt, not a record.
Disposal	A real cost sometimes excluded to lower a headline.
Excavation and spoil handling	Where does the material go?
Permit submission and fees	Included, passed through, or yours to handle?
Restoration standard	Backfill, seed, or full reinstatement?
Handling of additional findings	Priced how, and does work pause first?
Warranty	On what, for how long, voided by what?

Step three: read the exclusions aloud

Exclusions are where the real differences live, and they are written to be skimmed. Read them deliberately.

If a quote has no exclusions listed at all, that is not a good sign — it usually means they have not been thought through, not that nothing is excluded. Ask directly: what is not included in this price?

Step four: define the finish

Restoration is the most commonly under-specified part of any septic quote involving excavation, and the gap between "backfilled" and "reinstated" can be a significant fraction of the total.

Write down exactly what you expect the ground to look like afterwards, send that same description to each contractor, and ask them to confirm in writing whether their price includes it.

Step five: check what you get in writing

A written report or as-built documentation, as applicable.
Photographs of what was opened and observed.
Measurements taken.
Components fitted, with specifications.
Permit and inspection documentation, where relevant.
Warranty terms.
Recommendations, dated, separated from findings.

Step six: sanity-check the outlier

If one quote is dramatically lower, do not assume it is either a bargain or a scam. Find the scope difference — it is almost always there.

If one is dramatically higher, ask what they are seeing that the others are not. Occasionally the expensive quote is the only one that has understood the job, and that is worth discovering before the work starts rather than after.

Things that should override price

A contractor who will put the diagnosis and the scope in writing.
A contractor who states exclusions without being pushed.
A contractor who says plainly whether work is a fix or buying time.
A contractor who agrees to pause and get authorisation above a threshold.
A contractor whose credentials and insurance you have verified.
A contractor who does field work themselves if that is where this may lead.
A contractor who explains rather than pressures.

A one-page comparison sheet

Put the quotes side by side and fill this in before looking at any total. Twenty minutes here routinely finds differences worth far more than that.

Row	What you are recording
Finding addressed	Are they all solving the same defined problem?
Included	Line by line, what each price covers.
Excluded	Written exclusions. Blank here is a warning, not reassurance.
Unstated	Anything neither included nor excluded. This is where surprises live.
Permits	Who submits, and whether fees are in the price.
Surface finish	Backfilled, graded, seeded, or fully reinstated.
Extra findings	How priced, and whether work pauses first.
Documentation	Report, photographs, as-built, permit paperwork.
Warranty	On what, for how long, voided by what.
Payment	Schedule, and what is due before work starts.

Common questions

Should I always take the lowest septic quote?

Only after confirming the scopes match. A lower price for the same defined scope with the same exclusions and the same finish is genuinely better value. A lower price achieved by excluding disposal, assuming a smaller tank, skipping the baffle inspection or leaving you a rough backfill is not.

What if contractors disagree about what is wrong?

That is more important than any price difference and it needs resolving first. Ask each what they opened and observed, and what led to their conclusion. If it remains unresolved at replacement scale, pay for an independent inspection — it is cheap relative to the decision it informs.

Is a written quote necessary for a simple pumping?

A written confirmation of what is included is worth having even for routine work: assumed tank size, whether locating and uncovering lids is included, whether disposal is included, and what you will receive in writing. It can be a short email — the point is that it exists.

How do I compare a fixed price against time and materials?

Ask the time-and-materials contractor for their expected hours and their assumptions, then compare on that basis while recognising you carry the overrun risk. Whichever you choose, agree a threshold above which they stop and get your authorisation before continuing.