How to compare sewer quotes line by line

01 /Why do sewer quotes for the same job differ so much?

Sewer quotes differ mostly because contractors are pricing different scopes, not because some are honest and some are not. One quote stops at the property line; another includes the road cut. One includes sod; another says "rough grade". One assumes the camera is right about depth; another carries a contingency for rock.

Your job is to turn three differently written documents into one comparable table. Once scope is identical, the remaining price difference reflects genuine differences in overhead, crew and risk appetite — and that is the part you can fairly compare.

Compare scopes first, prices second.

02 /The sewer quote comparison worksheet

Copy these rows into a spreadsheet or onto paper with one column per contractor. Fill each cell with the dollar amount, "included" (no separate price), "excluded" or "not stated". Every "not stated" becomes a written question.

For a faster first pass, the interactive quote comparison worksheet takes each quote's total, tax status, method, metres, warranty and ten common inclusions, then shows a side-by-side table and turns every missing inclusion into a question for that contractor. Use it to find the gaps, then use the full table above to settle the details.

03 /How do I fill the gaps between quotes?

Fill gaps by asking each contractor the same written question and adding their answer as a priced line. Never assume an unmentioned item is included.

Using the example above, Contractor A looks cheapest at $16,500. But A excludes the city side, leaves permits to the owner and offers only rough grading. If your municipality puts the owner on the hook for the city side, and that portion costs several thousand dollars, and sod and a permit add another $1,500, A may become the most expensive quote.

1. List every "excluded" and "not stated" line for each contractor.
2. Send one email per contractor listing those items and asking for a price or confirmation of inclusion.
3. Add the answers into the worksheet.
4. Only now compare totals.

Where a contractor cannot price an item — for example rock that may or may not be there — ask for a unit rate (per hour of breaking, per cubic metre) so the risk is capped in writing.

04 /How do I compare per-metre cost?

Per-metre cost isolates the core pipe work from the one-off items. Subtract permits, the city connection, restoration and cleanouts from each total, then divide by the metres of pipe in scope.

A per-metre figure far below these ranges suggests missing scope or an unrealistic depth assumption. Far above suggests difficult conditions or padding — both are reasons to ask, not to decide. Short runs also read high, because fixed costs are spread over fewer metres; sewer line cost per foot shows the effect with worked numbers. The sewer cost estimator does this cross-check with your specific conditions.

05 /What should decide between quotes once scope matches?

Once scope is matched, weigh price against five quality signals. Each can be checked from paperwork, not just conversation.

Workers' compensation coverage matters on sewer work because excavation injuries are serious. In most provinces you can check a contractor's account status with the provincial workers' compensation board.

Payment structure deserves the same scrutiny as price. A 50 percent deposit on a quote that is otherwise cheapest can carry more risk than a slightly higher quote with a 10 percent deposit and a final payment tied to the post-work video. Paying for sewer repairs explains what a reasonable schedule looks like and how to compare financing.

06 /How do I compare quotes that use different methods?

When one contractor quotes open-cut and another quotes lining, compare them on outcome and total installed cost, not on the method's reputation. Ask three questions of each quote, in this order.

1. Does the method fix every defect on the footage? A liner cannot fix a belly; if the camera shows one, the lining quote must add a dig at that spot or explain why the sag is acceptable.
2. What does the site look like afterwards? Add restoration to every quote. Open-cut under a driveway carries a concrete bill that lining avoids.
3. What is the end condition of the pipe? New PVC on grade, a jointless liner inside the old pipe, or new HDPE along the old path — each has different warranty terms and future repair options.

Only after those three answers are on paper is a price comparison meaningful. A $4,000 difference in favour of lining disappears if the lining quote leaves a sag that will need excavation within a few years, and a $4,000 difference in favour of open-cut disappears once the driveway is replaced. Trenchless lining vs pipe bursting cost covers the method-fit table in detail, pipe bursting cost explains how pit count moves a bursting quote, and is trenchless sewer repair worth it covers lifespan and warranties.

07 /A decision rule for three quotes

1. Discard incomplete quotes

   If a contractor will not answer the gap questions in writing, remove the quote.

2. Compare matched totals

   Within 15% of each other, price is not the deciding factor — choose on method rationale, warranty and payment terms.

3. Question outliers

   If one matched quote is far lower, ask what they are doing differently. If one is far higher, ask what risk they are pricing that others are not.

4. Confirm the method

   If quotes recommend different methods, make sure the footage justifies each. See trenchless lining vs pipe bursting.

5. Read the contract

   Check the 15 questions to ask before signing and the red flags list.

To start with three quotes that price the same scope, request quotes with your footage, the start and end points, and the surface to restore. For what each line should look like in a well-written quote, see the sample sewer quote anatomy.

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