Solar PV now has a solid footing in the residential market, and the building codes have caught up—here's what you need to know.

With the complicated arrays of wires, ducts, and plumbing pipes they conceal, laundry room walls are common places for building code violations.

Code expert Glenn Mathewson takes a closer look at the evolving code provisions for deck boards, joists, beams, posts, and foundations.

While they're both found on typical staircases, porches, and decks, guards and handrails have different purposes and code requirements.

Installing a tank water heater might seem easy, but some of these common mistakes could be life-threatening.

Code expert Glenn Mathewson describes how to provide makeup air for a kitchen exhaust fan to prevent backdrafting of water heaters, furnaces, and other fuel-burning appliances.

The combination waste and vent system is a simpler alternative to island fixture vents and air-admittance valves, and a recent code change may make it more popular.

Code expert Glenn Mathewson explains how changes are made to the International Residential Code, with a chart detailing the code-development process.

Code expert Glenn Mathewson explains the details required by code and modern plumbing standards when fabricating a shower pan.

Learn how a sleeping room is legally defined and what sort of egress openings are mandated by building codes.