What should a complete backflow preventer replacement quote include?

The warranty needs its own line item too. Ask each bidder to state:

- Replacement device warranty period and what it covers
- Installation labor warranty period
- Whether parts such as shutoff valves, fittings, and drain piping are included
- Who pays for removal, retesting, and labor if the new device fails or doesn’t pass the post-installation test during the warranty period
- Whether the warranty depends on using the installer for future testing or maintenance

That’s especially useful when comparing a quote that includes testing with one that only says “replace backflow preventer.” I’d also ask whether the quoted test is the final report submitted to the water authority, if submission is required, or whether that’s a separate owner responsibility.

The quote should state who coordinates any required utility approval or inspection, and who handles corrections if the installation fails inspection.

I’d want responsibility and fees spelled out for:

- Scheduling the authority’s inspection or approval
- Submitting the tester’s report and required paperwork
- Returning to correct installation or code issues
- Paying for reinspection, retesting, extra labor, or materials when the failure results from the installer’s work

Otherwise, “testing included” might only mean a test was performed, while the owner is left to manage the approval process and unexpected correction costs.

The quote should also state the sizing basis: assumed static and working water pressure, expected flow rate, and any manufacturer sizing requirements.

A replacement can be the correct nominal size and still be a poor match for the system. If it’s undersized, it may create an unnecessary pressure drop at peak demand. If it’s oversized, it might not operate reliably at the system’s normal low flow. The quote should say whether the proposed device is based on the existing device size or on an actual flow and pressure check.

That’s separate from the post-installation test and authority paperwork. A device can pass the backflow test while the installation still performs poorly for the building. If the contractor can’t verify the operating conditions, the quote should state the assumption and identify who pays if field conditions require a different device or piping changes.

Quotes can separate the sizing basis from the cost of verifying it. Requiring a flow-and-pressure check before every quote may add cost before anyone knows whether the replacement is straightforward.

A quote could state clearly:

- Whether sizing is based on verified static and working pressure and measured flow
- Whether it assumes the existing device size and connection layout
- The cost of a site flow-and-pressure check, if needed
- Who pays if the measurements require a different device, pipe size, or additional work

That keeps bids comparable without presenting an unverified assumption as a confirmed design. The final installation should still be sized from suitable operating information, not just the old device’s label. A backflow test can pass while the system still has excessive pressure loss, so the quote should distinguish design verification from the post-installation test and its paperwork.