# Under-sink water filter installation estimate scope checklist in Canada

Plan an under-sink water filter installation estimate in Canada for one kitchen sink cabinet. Review measured quantities, the Kingston, Ontario CAD calculation, scope exclusions and matching PDF.

Canonical: https://quicklyestimates.com/en-ca/guides/how-to-estimate-under-sink-water-filter/
Author: Estimates editorial team
Published: 2026-09-25
Updated: 2026-09-25

For one kitchen sink cabinet, start with a defined scope and measurement basis. Measure cabinet clearances, pipe arrangement, service access and tap-hole plan. Separate filter kit, tap and connector allowances; note future cartridge service is outside the quote. Price the listed tasks separately and state the condition that would require a revision: A countertop that cannot accept the tap needs another product or scope. The Kingston, Ontario worked example checks 7 CAD cost lines against the measured scope, with a C$1,965.00 illustrative subtotal before tax or markup.

THE ESTIMATING ANSWER

For one kitchen sink cabinet, start with a defined scope and measurement basis. Measure cabinet clearances, pipe arrangement, service access and tap-hole plan. Separate filter kit, tap and connector allowances; note future cartridge service is outside the quote. Price the listed tasks separately and state the condition that would require a revision: A countertop that cannot accept the tap needs another product or scope.

This guide uses a fictional project in Kingston, Ontario: One kitchen sink cabinet . Its matching estimate and PDF (https://quicklyestimates.com/en-ca/samples/under-sink-water-filter-estimate/) give each scope decision a visible CAD cost line. Use the document to understand the structure; verify the actual building, product schedule, labour and supplier inputs before preparing a client quote.

1. Define the measured job

Install one selected under-sink drinking-water filter at an accessible existing sink cabinet with compatible supply and a separate dispensing tap if selected. Measure cabinet clearances, pipe arrangement, service access and tap-hole plan. Record the measurements and existing condition in the estimate before turning quantities into line items. The scope should make clear why this is a separate project from a broader renovation or maintenance quote.

Measurement basis: Measure cabinet clearances, pipe arrangement, service access and tap-hole plan.

2. Build a product and labour schedule

Separate filter kit, tap and connector allowances; note future cartridge service is outside the quote. This example has 7 distinct lines, including cabinet and supply check, filter kit allowance, tap and connector allowance. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.

Selections to confirm: Separate filter kit, tap and connector allowances; note future cartridge service is outside the quote.

3. Sequence the work and handoffs

Confirm supply isolation and cabinet space before drilling the counter or fitting the unit. Show which task depends on access, a selected product or another trade. If that dependency is still open, label the price preliminary and identify the information needed before a firm quote.

Work sequence: Confirm supply isolation and cabinet space before drilling the counter or fitting the unit.

4. Set a change boundary

A countertop that cannot accept the tap needs another product or scope. The example excludes whole-house treatment, water quality guarantee or countertop replacement. Record the discovery, agree the revised work and update the estimate before adding it to the job.

If the job changes: A countertop that cannot accept the tap needs another product or scope.

Review the Canadian job address

Verify the existing water, waste and fixture connections on site. Confirm who handles any required trade work, approvals and inspections for this address; this fictional document does not decide them.

Count the actual units, site visits and selected products separately. A count in this example is a document input, not a substitute for inspecting the real property. The example amounts are fictional CAD document inputs, not current rates for Kingston, Ontario or another community. A site visit and current supplier information are needed to replace them.

Work through the itemized calculation

Check each extension of quantity and rate in the paired PDF. Two lines from this project are:

- Filter kit allowance: 1 each × C$590.00 = C$590.00.
- Tap and connector allowance: 1 set × C$265.00 = C$265.00.

Adding all 7 rounded line amounts gives C$1,965.00 . The PDF shows 0% tax and the same total before any markup. The sample shows 0% tax only to make the arithmetic visible. Determine any applicable GST, HST or PST and markup for the actual work before sharing a quote.

Under-sink water filter installation example · CAD Work item | Quantity | Unit rate | Amount |

Cabinet and supply check | 1 job | C$190.00 | C$190.00 |

Filter kit allowance | 1 each | C$590.00 | C$590.00 |

Tap and connector allowance | 1 set | C$265.00 | C$265.00 |

Mount and pipe filter | 1 each | C$420.00 | C$420.00 |

Counter opening allowance | 1 job | C$205.00 | C$205.00 |

Flush and leak test | 1 job | C$190.00 | C$190.00 |

Cleanup and instructions | 1 job | C$105.00 | C$105.00 |

Illustrative subtotal | C$1,965.00 |

Scope and pricing boundaries

Install one selected under-sink drinking-water filter at an accessible existing sink cabinet with compatible supply and a separate dispensing tap if selected.

Outside this example: No whole-house treatment, water quality guarantee or countertop replacement.

Keep the product allowance, installation work and any unresolved condition visible as separate decisions. If access or the selected product changes, update the affected quantity or rate and explain the revision before the client relies on the estimate.

Before you send the estimate

- Measure cabinet clearances, pipe arrangement, service access and tap-hole plan.
- Separate filter kit, tap and connector allowances; note future cartridge service is outside the quote.
- Confirm supply isolation and cabinet space before drilling the counter or fitting the unit.
- A countertop that cannot accept the tap needs another product or scope.

Check the business, client, property, dates, line extensions and notes. The under-sink water filter installation PDF example (https://quicklyestimates.com/en-ca/samples/under-sink-water-filter-estimate/) shows one way to present them. Its short PDF note lists the brief's scope exclusions; the fuller project limits above should guide your own scope.

Questions about this estimate

Which quantity controls this under-sink water filter installation estimate?

Measure cabinet clearances, pipe arrangement, service access and tap-hole plan.

When should this under-sink water filter installation quote be revised?

A countertop that cannot accept the tap needs another product or scope. No whole-house treatment, water quality guarantee or countertop replacement.

(https://quicklyestimates.com/en-ca/samples/under-sink-water-filter-estimate/) First page of the fictional under-sink water filter installation estimate PDF in CAD · View the matching example (https://quicklyestimates.com/en-ca/samples/under-sink-water-filter-estimate/)

MAKE THE NEXT ESTIMATE YOUR OWN

Build an under-sink water filter installation estimate.

Enter the job scope in Estimates on iPhone or Android or start from an AI-assisted draft. Check every quantity, rate, allowance, client detail and note before exporting the PDF. Some app features may require an in-app purchase.

Create an estimate ↗ (https://quicklyestimates.com/en-ca/download/)Inspect the PDF example → (https://quicklyestimates.com/en-ca/samples/under-sink-water-filter-estimate/)

Continue planning the work

- Under-sink water filter installation labour and materials estimate example (https://quicklyestimates.com/en-ca/samples/under-sink-water-filter-estimate/)
- Water softener installation example (https://quicklyestimates.com/en-ca/samples/water-softener-installation-estimate/)
- Create a contractor estimate for a Canadian client (https://quicklyestimates.com/en-ca/guides/create-a-contractor-estimate/)

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