How Do I Build a Screened Sun Porch on a Deck Without Attaching It to the House?


Adding a screened-in sun porch to an existing deck creates a relaxing room away from the house. The porch gives you the beauty and feel of the outdoors, without the bugs and birds. Placing the sun porch on an existing deck that isn't attached to the house gives you the advantage of a pre-built foundation and possibly a full 360-degree view.

Things You'll Need

  • 4 2-by-4 inch board, 10 feet long
  • Saw
  • 2-by-2 inch boards
  • 2-by-4 inch studs
  • “L” brackets
  • Measuring tape
  • Shovel or post-hole digger
  • Concrete
  • Nails
  • Hammer
  • Door frame
  • Screen door
  • Screen rolls
  • Staple gun
  • Screwdriver or drill
  • Wire cutters
  • Level
  • Roof trusses or roofing boards
  • Shingles or roofing material
  • Plywood
  • Ladder
  • Measure the deck's corners and cut a notch out of each 2-by-4-inch board, so that 2/3 of each board fits over the corner of the deck.

  • Dig a hole at each of the deck's four corners. The holes must be 2 feet deep and 8 inches wide. If the deck is an odd shape, not rectangular or square, one hole must be dug at every corner. If the deck doesn't extend past the posts in the ground, place the hole as close as you can to the corner.

  • Pour 18 inches of concrete in one hole and place one 2-by-4-inch, 10-foot-long board in the hole. Position the board so that the notch slides over the corner of the deck. Pack the rest of the hole with concrete and hold the board steady until it can stand independently. Repeat this process for the other corner boards. Most concrete will dry in 30 minutes to five hours. Check the sack for the drying time. Wait for the concrete to dry before continuing the project.

  • Nail 2-by-2-inch boards horizontally around the outside rim of the deck. Decide if your studs will be placed 16 or 24 inches apart and mark the correct locations. Attach the studs to the 2-by-2 boards with “L” brackets. Once the studs are in place, attach 2-by-2-inch boards around the top as framing. Check to ensure the frame is level.

  • Install the roof trusses or roofing boards across the top, every 16 inches. Roof trusses are available in custom sizes to fit any structure. If you aren't using trusses, nail the roofing boards to the frame. Cover the trusses or roofing boards with plywood and install the shingles or roofing material.

  • Select the door's location and screw the frame into place.

  • Cut the roll of screen to the length needed with the wire cutters. Some thin screen material can be cut with scissors. Staple the screen to the studs and 2-by-2 boards on the inside of the screen porch. Cover the entire porch with the screen, except for the door area. Hang the door in the frame. Use the level to determine if the floor under the door frame is level. Screw the hinges in the door jamb. Line up the door with the door hinges and attach the door to the hinges with the screws provided.

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