Two homeowners on the same concession road get septic replacement quotes. One is $16,000. The other is $22,000. The first homeowner signs, relieved. Four months later the invoice is $22,400, and every extra line on it is something the second quote had listed from the start.
This happens constantly, and it is not usually fraud. It is the difference between a quote that prices the installation and a quote that prices the project. A septic replacement is nine or ten separate pieces of work performed by three or four different parties, and a number that covers only the excavator’s share is not a lower price. It is a partial one.
Here is what a complete quote looks like, what each piece costs in Kawartha Lakes, and how to read one against another.
The Quick Answer
A full septic system replacement in Ontario runs $15,000 to $35,000, with most jobs landing between $15,000 and $30,000. A complete quote for that work should itemize:
| Line item | Typical cost | Who does it |
|---|---|---|
| Perc test | $500 – $1,500 | Designer or soils consultant |
| Soil profile / deep test pit | $500 – $1,000 | Designer, with an excavator |
| System design | $1,500 – $3,500 | Licensed sewage system designer |
| Septic permit, City of Kawartha Lakes | $975 (Class 4, ≤4,500 L/day) | Applied for by the installer or designer |
| Old tank removal and disposal | $1,500 – $3,000 | Installer |
| New tank, bed materials, excavation, installation, backfill | The bulk of the total | Installer |
| Final inspection and documentation | Included | Municipal inspector, coordinated by installer |
| Grading and restoration | Included or itemized | Installer |
| Pump chamber, dosing, alarm (where the design requires) | Itemized | Installer |
Permitting and design together typically run $3,000 to $7,000 before a shovel moves. If a quote does not show them, ask whether they are inside the number or outside it. That single question explains most $6,000 gaps.
The Nine Line Items, and What Each Should Say
1. Soil testing. The perc test and test pits establish what the ground can absorb, and that determines the system type, which is the single biggest driver of the total. A quote that names a system type without soil work behind it is guessing, and the guess is almost always the cheaper system. If the testing was already done, the quote should reference the report.
2. Design. The drawing the permit is issued against, stamped by a BCIN-registered sewage system designer or an engineer for unusual sites. The quote should name who is doing it and whether the fee is included. Our guide to designers, installers and engineers explains why this is a separate qualification and not something the crew does on the tailgate.
3. Permit. Non-negotiable for any replacement. The quote should say who applies, the fee, and that it is included. The City of Kawartha Lakes permit is $975 for a standard Class 4 system, and review typically takes 2 to 4 weeks for straightforward applications. A quote silent on permits is a quote you should ask about before anything else.
4. Old system removal. Pulling a concrete tank and hauling out old bed material is trucking and time: $1,500 to $3,000. Some tanks can be decommissioned in place and filled, which is cheaper, but the installer and the building department both have to agree. The quote should say which.
5. Tank. Size and material. Size is set by bedrooms under the Building Code, and the design specifies it. The quote should state it in litres so you can check it against the drawing.
6. Bed, or the alternative. This is where the range opens up. A conventional tile bed on good soil is the low end. Thin soil over Shield rock, clay, or a high water table forces a raised mound, and the imported sand, trucking and grading take a system to $25,000 to $45,000. A small or waterfront lot that needs a tertiary treatment unit runs $28,000 to $45,000. The quote should name the system type and tie it to the soil work in line one. Replacing the bed alone, with a sound tank kept in service, runs $10,000 to $25,000; the leaching bed replacement cost guide covers that scope.
7. Excavation, installation, backfill. The labour and machine time. Usually bundled with the materials. The quote should state what is included in restoration: rough grade only, or topsoil and seed.
8. Components the design calls for. Pump chamber, effluent pump, dosing system, alarm and control panel, distribution box, effluent filter. Each one is a real cost, and a pressure-dosed system has several of them. They should appear as lines, not surprises.
9. Inspection and paperwork. The City inspects before backfill and signs off the finished system. The quote should say the installer coordinates that and that you receive the documentation, because that paperwork is what you hand the buyer when you sell.
How to Read Two Quotes Against Each Other
Put them side by side and work down the nine lines. For each one, mark it as included, itemized, or absent. Absent is the problem, not expensive. An absent line is a cost that will arrive later with no reference point.
Then check three things that numbers alone will not show you:
Does the system type match the soil? If one quote says conventional bed and the other says raised mound for the same lot, one of them has not done the soil work or is ignoring it. The more expensive quote is not automatically the honest one, but the one with a perc report attached is the one that has a basis.
Can the price change, and under what conditions? A proper quote says the price changes only if the scope changes, and that you are told before any extra work happens. Anything looser than that is an estimate, and Ontario’s consumer protection rules for home services treat written estimates differently from open-ended ones.
Is a site visit behind it? Nobody can price a septic replacement from a phone call. A quote produced without someone standing on the property is a price list, not a quote.
For a rough itemized range of your own before you collect quotes, the replacement cost estimator walks through scope, soil, removal and permit status and returns each line separately, so you know what a complete number should look like before anyone hands you one.
What Is Not a Red Flag
A high number is not, by itself, a warning sign. Mounds are expensive because sand and trucking are expensive. Tertiary units are expensive because they are treatment plants in a box. A quote that reflects the site honestly will sometimes be the most expensive one on the table.
Allowances are not a red flag either, if they are named. “Allowance of $X for rock excavation if encountered, billed at cost with photos” is how an honest contractor handles what cannot be seen from the surface. A blank “additional charges may apply” is the version to question.
One Question Before Any of This
Before comparing replacement quotes, confirm that replacement is what you need. A cracked baffle, a failed effluent filter, or a collapsed distribution pipe produces every symptom of a dead bed, and general repairs run $200 to $800. A septic inspection at $150 to $500 is the cheapest line on any of these quotes, and it is the one that can make the rest of them unnecessary. The full picture of when replacement is genuinely the answer is in our septic system replacement cost guide, and if the number is real, financing options covers how homeowners here usually handle it.
Frequently Asked Questions
Should a septic quote include the permit and design?
Yes, or it should say in writing that they are excluded and what they will cost. In Kawartha Lakes the permit is $975 for a standard Class 4 system and the designer $1,500 to $3,500; with soil testing, permitting and design together typically run $3,000 to $7,000 before excavation. A quote that leaves them out is not cheaper, it is incomplete.
Why is one septic quote $10,000 more than another for the same house?
Usually one of three reasons: one quote excludes soft costs and removal, one specifies a different system type because the soil work was or was not done, or one includes components like a pump chamber and dosing system that the other left off. Work down the nine line items and the gap will show you which.
Can a septic contractor charge more than the quote?
A proper quote changes only if the scope changes, with your agreement before the extra work happens. Named allowances for things that cannot be seen from the surface, such as rock, are reasonable if they are stated up front. Open-ended “additional charges may apply” language is where disputes come from.
How long is a septic quote valid?
Ask. Material and trucking prices move, and a quote from spring may not hold in fall. A fair contractor will tell you the window and honour it.
Do I need more than one quote for a septic replacement?
For a five-figure job, yes. Any contractor confident in their diagnosis expects a second opinion. Use the same nine lines to compare them, and weight the one with soil work and a site visit behind it.
What Our Quotes Look Like
Every installation or replacement we do starts with a site visit and ends with a written, itemized quote. The price changes only if the scope changes, and we tell you before any extra work happens, not after. The design is stamped by a licensed sewage system designer; we handle the excavation, installation, and inspection booking.
And we diagnose before we replace. If a $200 to $500 baffle is the fix, that is the quote, not a new system. Call (705) 702-5526 or book a site visit. No travel surcharge and no minimum distance anywhere in the City of Kawartha Lakes.