Player's Handbook[]
A stonemason is able to build structures from stone so that they last many years. He can do simple stone carvings, such as lettering, columns, and flourishes. The stone can be mortared, carefully fitted without mortar, or loosely fitted and chinked with rocks and earth. A stonemason equipped with his tools (hammers, chisels, wedges, block and tackle) can build a plain section of wall one foot thick, ten feet long, and five feet high in one day, provided the stone has already been cut. A stonemason can also supervise the work of unskilled laborers to quarry stone; one stonemason is needed for every five laborers. Dwarves are among the most accomplished stonemasons in the world; they receive a +2 bonus when using this skill.
Player's Option: Skills & Powers[]
Stonemasonry: A character with this skill knows how to excavate stone from quarries, cut that stone into blocks, make bricks, mix mortar, lay stone or brick, and carve simple designs and symbols into stone. The mason can lay cobblestones or bricks for roads and courtyards, and the work can include small arches and cantilevered platforms. None of these tasks require proficiency checks. The character's tools include hammers, chisels, trowels, block and tackle, plumb lines, shovels, and wedges. If fully equipped, a typical mason can build a wall, 10' long, 5' high and 1' thick, in one day—if the stone is already cut. The character can erect walls, buildings, pillars, stone abutments for bridges, etc.
The character can step up the work by making a proficiency check. Also, if the stonemason doesn't have the benefit of the engineering proficiency, checks must be made for wall sections higher than 10', and for structures involving arches or elaborate corners.
A dwarven character receives a +2 bonus when taking this proficiency.