TradesDisclaimer
TradesWorkbench gives you a starting point for a decision. Every tool shows its math, its assumptions, and its sources so you can check the reasoning. It does not certify that anything meets code, and it does not know the specifics of your job, your building, or your local rules.
Always verify before you build
Building codes change by edition and by location, and many decisions depend on details a simple tool cannot see. Before you act on any result here, confirm it against the code adopted in your jurisdiction and, where the work calls for it, have it reviewed, installed, and inspected by a licensed professional. Where a result depends on a figure like a wire ampacity, a fixture unit, or a gas capacity, that figure comes from a published standard we cite, but you are responsible for confirming the current, correct value for your situation.
Safety-critical work
Some of this work is dangerous. Electrical, gas, and structural decisions can cause fire, injury, or death if they are wrong. We do our best to be accurate and to show our sources, but these tools are not a substitute for a qualified electrician, gas fitter, plumber, or engineer. If a tool says a decision is outside its scope or needs a professional, take that seriously.
No warranty
The tools and content here are provided as is, without any warranty. We do not guarantee that a result is accurate, complete, current, or suitable for your project, and we are not liable for any loss, damage, or injury that results from using them. You use them at your own risk.
Not a licensed professional
TradesWorkbench is not a licensed contractor, engineer, or code official, and using these tools does not create any professional relationship. Nothing here is an approval or a sign-off.
Questions about a specific result? Every tool lists its sources and assumptions on its own page. When in doubt, ask a licensed professional in your trade and your area.