Sizing, slope and code, dimensionedAll tools free

Code and permits

3 tools · 4 guides · 2 comparisons · 9 pages

What the code actually says, which code your jurisdiction adopted, and what a permit costs to pull.

Isometric illustration of blank code volumes, an inspection tag and a plan roll — IPC and UPC in plain language, plus the permit and inspection path for a residential job.

Calculators

Vent distance calculatorIPC · UPC

Maximum trap arm length by size, with the fall check that fails most inspections.

IPC 906.1

Expansion tank calculatorIPC · UPC

Tank volume from heater capacity, temperature rise and supply pressure.

gal · PSI

Permit checklist builderIPC · UPC

Scope in, printable list of drawings, forms and inspections out.

Print · Edit

Guides

International Plumbing Code basicsWhat the IPC is, how adoption works, and the sections a house job touches.11 min Plumbing permit costHow fee schedules are built, with real published fee examples.8 min Plumbing vent requirementsWet vents, AAVs, island loops — and why a trap seal breaks.10 min Backflow preventer requirementsHazard classes, assembly types and the annual test rule.9 min

Comparisons

IPC vs UPCAdoption by state and the clauses that genuinely differ on a house.compare ABS vs PVC for DWVTemperature rating, joining method, code acceptance and cost.compare

Keep the code book handy.

Every table on this site is dimensioned, sourced and dated. Bookmark the calculator you use most and it will be there on the next callout.

Open the calculators