Clear answers for the work in front of you.

Build Specs is a practical construction toolbox for framing and stairs, gas, water, electrical, and the everyday decisions that need a clear answer in the field.

Download for iPhoneGet the iOS app on the App Store Use on Android or in your browserWorks on Android, desktop, and any modern browser

ACTUAL APP / STRINGER MARKING GUIDE

Build Specs Stair Calculator Stringer Marking Guide showing a 7-and-a-half-inch rise and an 11-inch run

Actual stringer-marking guide · 7½″ rise · 11″ run

Example only—verify local requirements before you build.

SEE HOW IT WORKS

A closer look at the calculator.

Watch a quick walkthrough of the stair calculator and the layout details it puts in your hand.