New:

AI drafting for plumbing plans

AI Plumbing Plan Drafting

Plumbing plans depend on a fixture layout the architect keeps moving, and every moved lavatory or water closet means rerouting waste, vent, and water lines that were already drawn. Nomic drafts the domestic water and sanitary waste and vent plans in CAD from the architectural fixture layout, places cleanouts and fixture tags, builds the fixture schedule, and checks the sheets against the IPC or UPC before your engineer reviews them.

Start for freeAll drafting work
Last reviewed: November 2026

You send

  • Architectural floor plans with the fixture layout
  • Fixture cutsheets or the plumbing spec
  • Building sewer invert and water service location from the civil plans
  • The engineer's design criteria and water heater selection
  • Your CAD standards and past plumbing sheets

Nomic hands back

  • Sanitary waste and vent plans as DWG files
  • Domestic cold and hot water plans as DWG files
  • A fixture schedule in Excel and on the sheet
  • Clouded PDFs and an open questions list for the engineer of record
1234567ABCOFFICE401OFFICE402OFFICE403OFFICE404OFFICE405OFFICE406OFFICE407OFFICE408CONFERENCE409CONFERENCE410CONFERENCE411CONFERENCE412CONFERENCE413CONFERENCE414CONFERENCE415STAIRS24" SS-1CO4" SAN @ 1/8"/FT2" V27'-3"27'-0"27'-3"27'-3"27'-0"27'-3"94'-8"1APLUMBING PLANSCALE: 1/8" = 1'-0"N1234CONSULTING ENGINEERSREVISIONS1ISSUED FOR REVIEWPROJECTHARBOR POINT OFFICESSCALE1/8" = 1'-0"DATE12/09/2026KEY PLANSHEET TITLEPLUMBING PLANSHEET NUMBERP-101

On the sheet

Plumbing Plan, annotated

A plumbing plan with fixtures, waste and vent piping, and domestic water routed to each group.

  1. 1Water closet and lavatory on the wet wall
  2. 2Sanitary main sloped to the stack
  3. 3Vent line tied to each fixture
  4. 4Stack and cleanout

The problem

The fixture layout changes after the piping is drawn

A plumbing plan starts from the architect's toilet rooms, break rooms, and janitor closets, and those rooms change through design development as accessible clearances, partitions, and fixture counts get worked out. Each change sends a drafter back to reroute a waste line, move a vent, and shift the cold and hot water drops, usually on two sheets: P-101 for waste and vent and P-201 for domestic water.

Anyone who has reviewed a plumbing set knows the misses: a lavatory with no vent inside the trap arm distance, a long horizontal drain with no cleanout, a break room sink fed from a water heater 70 feet away with no recirculation, or a fixture tag on the plan that never made it into the schedule. Finding them takes no engineering judgment, only the hours to check every room.

01 / Layout

Waste, vent, and water drawn to every fixture

Attach the architectural floor plans, the fixture cutsheets, and the location of the building sewer and water service. Nomic connects each fixture to waste, vent, cold, and hot water, routes the mains, slopes the drains to the engineer's criteria, and places cleanouts where the code and your details call for them.

  • Waste and vent on one sheet and domestic water on another, or combined if your firm draws it that way
  • Cleanouts at changes of direction, at the base of stacks, and within the spacing limit
  • Water hammer arrestors, trap primers, and floor drains placed and tagged
02 / Schedules

A fixture schedule built from the cutsheets

Nomic reads each fixture cutsheet for the model, flow rate, and connection sizes, writes the fixture schedule, and tags the plan with the same P- numbers. A fixture drawn on the plan with no cutsheet, or a cutsheet with no fixture on the plan, comes back as an open item.

  • Fixture schedule in Excel and drawn on the sheet
  • Waste, vent, cold, and hot water connection sizes for each fixture
  • Flow and flush rates matched to the spec and the local conservation rules
03 / Check

Checked against the plumbing code and the arch layout

Nomic checks the plans against the IPC or UPC edition you name and against the latest architectural background. Every drawn change is clouded, and anything that needs a design decision, such as a fixture count question or a water heater location, goes on the open questions list for the engineer of record.

  • Trap arm distances, vent connections, and drain slopes checked
  • Hot water developed length and tempered water at public lavatories checked
  • Fixture locations compared with the current architectural revision

Checked against

The code and documents behind every sheet

Name the editions the project is designed to and Nomic checks its own drawing against them before handing it back. Your engineer or architect of record makes the final call and stamps the set.

  • International Plumbing Code or Uniform Plumbing Code
  • IPC Chapter 7 sanitary drainage and Chapter 9 vents
  • IPC Chapter 6 water supply and distribution
  • ADA 2010 Standards and ICC A117.1 for accessible fixtures
  • Project specifications Division 22

How it works

From a sentence to a stamped set

  1. Step 1

    Ask for the drawing

    Say what the sheet needs to show and attach the backgrounds, markups, cutsheets, or photos. A sentence is enough to start.

  2. Step 2

    Nomic drafts it in CAD

    Nomic works in CAD on its own computer, on your layers and blocks, following how your firm drew the same thing before. It saves real DWG files to the project.

  3. Step 3

    Nomic checks its own work

    The drawing is checked against the code editions you name and the source documents. Everything Nomic drew is clouded, and open questions are listed.

  4. Step 4

    Your team reviews and stamps

    Your engineers and architects review the clouded changes, make the final call, and issue the set under their own stamp.

FAQ

Frequently asked questions

Yes. Nomic works in CAD on its own computer and saves DWG files with sanitary waste and vent, domestic cold and hot water, cleanouts, and fixture tags. It draws from your architectural fixture layout and cutsheets, applies your CAD standards, and checks the plans against the plumbing code before your engineer reviews them.

Yes. You name the code and the edition the project is designed to, along with any local amendments, and Nomic checks against that. A project in California, where the plumbing code is based on the UPC, gets checked against different trap arm and cleanout rules than an IPC project.

Send the revised background. Nomic compares it with the version it drew from, reroutes the waste, vent, and water lines to every fixture that moved, updates the tags and schedule, and clouds each change so your reviewer sees exactly what was redrawn.

Your engineer of record. The engineer sets the design criteria, selects the water heater and the main sizes, reviews every sheet, and stamps the set. Nomic is a new source of drafting capacity that lays out and checks the plans to those criteria.

No. Nomic works in CAD on its own computer and saves DWG files to your project, which open in AutoCAD or any DWG editor. If your plumbing is modeled in Revit, Nomic hands back DWGs and a change list your modeler links into the model.

Keep reading

Related drafting work

AI Drafting for Plumbing Engineering

Domestic water, sanitary, vent, storm, and gas plans and risers drafted as DWGs with fixture units tallied.

AI Plumbing Riser Diagram Drafting

Waste, vent, and water risers with fixture unit tallies that match the floor plans.

AI Enlarged Restroom Plan Drafting

Toilet room plans and elevations with fixtures, clearances, and grab bars checked to ADA.

AI Drafting for Architectural Background Updates

Compares background revisions, updates the affected MEP and structural sheets, and clouds each move.

AI for MEP engineering

Every MEP workflow Nomic drafts and checks, from layout to submittal review.

What is a plumbing plan?

What the waste, vent, and water sheets in a construction set show.

Best AI for plumbing design

How AI tools for plumbing layout and review compare.

AI Plumbing Plan Drafting: Waste, Vent, and Water DWGs | Nomic