What is the Chandler water meter worksheet when you add plumbing fixtures?

The Room Additions section of the Chandler Homeowner Building Permit Manual says: "Please provide a water meter work sheet if you are adding plumbing fixtures (see Appendix A for an example). This information must be on the plans, not a separate sheet." That sentence tells you when (adding fixtures), what (a worksheet) and where (on the plans).

The manual's Remodeling section adds that "Remodeling projects typically need to comply with the same requirements listed for room additions." Our reading: a remodel that adds fixtures gets the same worksheet request, since the manual points remodels to the room addition list.

Appendix A (printed pages 51 and 52) is the worksheet. It has three parts:

• Fixture units. You count each fixture and multiply by a set value, then add the total.
• Pipe length. The manual asks for the "Total developed length of the water line from the water meter to the furthest water-using fixture unit" and notes "this is usually the hose bib at the rear of the home."
• Meter and supply size. You list the size of the existing meter and supply line. For a room addition the manual says "please include both the existing and new on this sheet."

Chandler adopted the 2024 IRC, with local amendments, in City Code 29-6 (Ord. 5108, effective 2025-07-01). The amendments listed in 29-6 cover items such as permit exemptions, fees and energy sections. We did not find an amendment to the IRC water supply chapter in that list, so the worksheet is the city's own submittal form rather than a code amendment.

A fixture unit is a rating for how much load a fixture puts on the water supply. The manual does not define it, so this is our reading of the term. Here are Appendix A's values, as printed:

The sheet says "If you use a full bath group, do not count the individual fixtures." It says that about the full bath group only. Our reading is that the same logic covers the other groups, since counting a group and its parts would double count. That reading matters: a half bath counted as a group is 2.6, but counted piece by piece it is 3.0 (2.2 plus 0.8).

The manual expressly requests the worksheet for residential room additions that add plumbing fixtures, and says remodels typically follow those requirements. It separately discusses accessory dwelling units. Its printed zoning text says ADUs "shall be served by the same water, sewer, and electric-utility providers and meters as the primary residence." Ask the plan reviewer how to show the combined existing and new fixture demand for an ADU; the manual does not separately describe the ADU worksheet procedure.

The manual's worksheet sentence addresses added fixtures in room additions; remodels typically follow those submittal requirements. It does not separately decide the worksheet requirements for a fixture relocation or other water-supply changes. Ask the plan reviewer about that scope. A residential water heater or softener replacement may be permit-exempt when Chandler's applicable same-location and equal-or-lesser rating or capacity conditions are met; separate piping or equipment changes must be considered separately.

A bathroom added to a three-bedroom house. The existing house has two full baths, one kitchen group, one laundry group and four hose bibs. Using Appendix A's values: two full bath groups at 3.6 is 7.2, plus 2.5 for the kitchen, 2.5 for laundry and 10.0 for four hose bibs, which is 22.2. Adding one more full bath group brings it to 25.8. That total, the developed pipe length to the actual farthest water-using fixture, and the meter and supply size go on the plans.

The edge case: the meter is the old size. The manual's note reads "NOTE: The minimum water meter size for new construction is 1 inch." An older Chandler home may have a smaller meter. The manual does not say an addition triggers an upsize. Our reading: the note applies to new construction, and the worksheet is there so the reviewer can see what the existing meter serves. The manual does not publish a maximum fixture-unit table for each meter size.

1. 1Count every fixture on the property, existing and new, including every hose bib.
2. 2Fill in Appendix A of the Homeowner Building Permit Manual (Chandler Development Services, chandleraz.gov).
3. 3Measure the developed length of the water line from the meter to the farthest water-using fixture, usually the rear hose bib.
4. 4Read the existing meter size from the meter box and note the supply line size.
5. 5Draw the worksheet information onto the plans, not onto a separate sheet.
6. 6Submit the plans with the building permit application. The manual lists the Construction Permit Counter at 215 East Buffalo and Development Services at 480-782-3000.

• Attaching the worksheet as a separate page. The manual says the information "must be on the plans, not a separate sheet."
• Counting only the new fixtures. For a room addition the sheet asks you to "include both the existing and new on this sheet."
• Counting the parts and the group. The sheet says not to count individual fixtures when you use a full bath group.
• Using any city's worksheet. Values differ between Chandler and Phoenix, as shown above.
• Mixing it up with the water meter certificate. Chandler's Water Meter Certificate (UDM-115) is a separate form with a registered architect, landscape architect or engineer certification block. It says "The System Development Fees and Meter Fees apply to any certified meter called out on the Water Meter Certificate." The form does not specify which projects must submit it. Ask Development Services whether UDM-115 is required for your project and how it relates to the worksheet on the plans.

This page explains Chandler's published manual and code as read on the date above. The city's current forms and adopted text govern.