Player's Handbook[]
The carpentry proficiency enables the character to do woodworking jobs: building houses, cabinetry, joinery, etc. Tools and materials must be available. The character can build basic items from experience, without the need for plans. Unusual and more complicated items (a catapult, for example) require plans prepared by an engineer. Truly unusual or highly complex items (wooden clockwork mechanisms, for example) require a proficiency check.
Player's Option: Skills & Powers[]
This character knows the basics of working with wood and can create—with no check required—small structures, fences, platforms, cabinets, carts and wagons. The carpenter can make wooden wheels, but a blacksmith must form the iron rim or the wheel will have a very short life expectancy.
A carpenter might build a short footbridge, a wooden clock, or a dumbwaiter system—these tasks will require a proficiency check. Larger projects such as major bridges, boats, or catapults, require the aid of a character with the engineering proficiency.