Installing a Gas Fireplace in the Basement

Choose a location for your fireplace in your basement. The fireplace must be positioned near a gas line, and ideally will be located next to a window. If a basement window is not available, choose a wall that extends above the surface of the ground.

Remove one pane of the window, if any, and fill the gap with a stovepipe thimble, fastening the corners of the thimble to the window frame with finishing nails. If no window is at hand, cut a hole in the wall using a concrete saw (for a foundation wall) or circular saw (if the wall is made of wood). If you're working with a wooden wall, frame the hole with 2-by-4s, toe-nailing them to the nearest stud and to each other. Screw the thimble to the wood frame or concrete wall.

Build a surround for your fireplace, if you desire. A surround is the built-up portion on either side and above a fireplace, often including a mantel and decorative paneling. Most surrounds are made of wood, but they may include plaster or tile surfaces. The steps necessary to construct it will vary depending on the design and materials you wish to use. If you don't mind looking at a bare fireplace, skip this step to save time and money.

Slide the fireplace into position and connect its vent to the wall thimble with vent pipe. Most types of vent pipe simply slide into place and can then be twisted to lock. Use elbow joints to transition between horizontal and vertical piping, allowing you to join the low fireplace vent to the thimble near the top of the wall. Apply caulk to all visible gaps.

Hire a master plumber to connect the gas line for you, for maximum safety, then turn on your fireplace to test it.