How to Build a Window Well

• 1). Window wells vary by size, materials and drainage methods depending on your locale. If you're not sure where to begin, look at a few that have been built locally to see what works (and doesn't) in your area. Be careful not to undersize your window well. Refer to local code if necessary. Make sure that the top edge of the well will project higher than the surrounding soil. Also account for the space that may be needed for opening the window. Once you have an idea of what you are building, order the necessary materials.
  
  
• 2). Mark where you intend to place your window well using the string and stakes. The marked area is what will be excavated and should be at least twice as large as the actual installed well. If you are using a prefab well unit, it is helpful to use it as a guide.
  
  
• 3). Dig the hole for the well. Dig deep enough to allow for the placement of plenty of drainage material (like gravel) at the bottom. Be sure to install a drainage line or have the well drainage tied into an existing foundation drain system. If no drain lines are installed, the accumulating water may seep or run into your basement. Drainage is essential for this to be a successful project.
  
  
• 4). Once the rough hole is dug, add a layer of drainage gravel in the bottom of the hole where the well will be centralized. A 5- to 8-inch-deep layer is good (but refer to local code). Extend gravel out a few inches beyond the well wall. If the window is not already installed, do so according to the window manufacturer's specifications. Caulk and seal the window as required.
  
  
• 5). Put in the window-well unit as recommended by the manufacturer, being sure to install any seals or gaskets against the foundation to prevent seepage. After the well is mounted to the foundation, add additional gravel to the bottom of the well until it is a couple inches below the window sill. Also add 2 to 4 inches of gravel around the exterior of the well unit. If necessary, have the installed window well inspected, then backfill the removed soil and landscape. Add a window-well cover for additional protection from water and increased safety if desired.