Case study: scoping a 541-unit plumbing replacement, AjaxOPS

The challenge

A regional operator needed to bid a full domestic water pipe replacement across a 541-unit, 5-building garden-style portfolio. They had a unit-mix matrix and marketing floor plans, but no plumbing riser diagram. Without knowing where the wet cores stack and how many risers run, a contractor either pads the bid heavily or walks. Mapping it by hand across 10 unit types and 5 buildings is days of takeoff work before a number can even be priced.

What AjaxOPS delivered — in hours, not days

Read the marketing plans and the unit-mix matrix, then identified and boxed the wet core in all 10 unit types: kitchen plus every bath, with fixtures labeled (toilet, vanity, tub/shower, sink).
Derived a per-building riser and lateral schedule directly from the stacking matrix, with the back-to-back sharing logic spelled out so cores can pair onto shared-wall risers.
Packaged an 11-page, bid-ready markup set the operator can hand straight to bidding contractors.

541Units

10Unit types

5Buildings

107Vertical stacks

~295Gross risers

Gross count before back-to-back sharing; shared demising walls pair cores onto fewer real risers.

A one-bedroom unit floor plan with the wet core outlined: the kitchen and every bathroom are boxed together and each fixture is labeled, including toilet, vanity, tub or shower, and sink. — Wet cores boxed per unit type (1 of 10)

A derived riser and lateral schedule table listing each building with its vertical stacks and riser counts, produced from the unit stacking matrix. — Riser / lateral schedule, derived

The takeaway

AjaxOPS reads your plans so you can price the work. Request access to put it on your portfolio.

Schematic planning aid; confirm counts against architectural and plumbing drawings. Client details anonymized.