How to Convert a Lanai to a Sunroom

A lanai is a Hawaiian word, referring to an open porch attached to a home. It is designed to catch breezes and provide ventilation. A sunroom is a completely enclosed all-weather space, surrounded on three sides by windows. As most lanais are built from beam and post construction, you can convert them for use as a sunroom, by installing windows and framing in the walls. Converting a lanai into a sunroom could increase the value of your home, as it may add to the interior square footage.

Measuring tape
2 by 4 pressure treated lumber
Circular saw
Hammer
3-inch galvanized steel nails
Plywood sheets
24-inch wide windows with screen inserts
Weather-proof sheeting
Siding

Instructions

- 1
  Measure the width of the exterior of the lanai area, with a measuring tape, to determine the amount of lumber needed to add headers between the lanai posts and plywood sheeting.
- 2
  Cut a piece of 2-by-4 lumber with a circular saw, so it fits between the spacing on the lanai posts.
- 3
  Nail 2-by-4 headers three feet above the floor, in between the lanai posts, to create a ledge to support a window.
- 4
  Install another 2-by-4 header above the window ledge, the same height as the window that you are going to install.
- 5
  Insert the window into the opening, according to the manufacturer's instructions.
- 6
  Repeat these steps for all other post spaces.
- 7
  Cover all other exposed spaces with plywood, to completely enclose the lanai.
- 8
  Cover the exterior plywood with weather-proof sheeting, according to the manufacturer's instructions.
- 9
  Install vinyl or aluminum siding over the exterior of the lanai, to complete the exterior of the sunroom.
- 10
  Finish the interior of the sunroom with carpeting, drywall or wood paneling.

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