Building a Three Season Porch

A Great DIY Project

If you love screen porches then building a three season porch may give you the best of both worlds. Three season porches (also called sun porches) have evolved to solve the problems of the outdoors.



Three season porches enable homeowners to enjoy their porch even with changing weather, seasonal issues and insects.

The difference between a sun porch (or three season porch) and a 4-season porch is that a sun room is not insulated, or heated or cooled through mechanical means.

Screen Porch Windows on beautiful two-story home
See these screen porch windows courtesy of DIY Eze

Advantages of a 3-Season Porch

  • Building a three season porch is a very popular and practical home improvement option that can extend your stay outdoors in comfort.
  • It as a room of many uses because it is any room you want it to be at anytime.
  • Exercise, relax in a soothing hot tub, sip wine beside a cozy fire, entertain friends and family, or curl up with a great book.
  • A 3 season porch can offer a respite from the hot summer sun. It can also help cool your home by providing a buffer between your house and the outdoors.

3 Season porch at the beach
Three season porch with knee wall
Woman reading book on 3 season porch For the investment, you can't go wrong with building a three season porch! Once you have one, you'll wonder why you didn't do it sooner!

Mary and I used ours extensively. We ate, entertained, relaxed, talked, watched TV, read the newspaper, listened to music, and spent quite a few nights "sleeping" out on our 3 season porch.
You can DIY
  • You can purchase a sun room kit
  • You can hire a contractor (or have the contractor install the 3-season kit)

  • For the DIYer who would like to build a three season porch, here's the good news! It's very doable and not much different than converting your existing porch to a screened porch. Also, sun room kits are also easy to install.

    If you would rather spend your time doing other things than building a three season porch hiring a contractor is a viable option; costs are minimized because you already have the basic structure in place.

    I'm assuming you have an existing porch in excellent condition, with roof, columns, flooring,stairs, etc., all in good repair. I can't address every issue for every type porch but will give you the basics that should cover most porch situations.



    The following is for the DIYers and DIY wanna-be's, those ingenious souls who like to make some sawdust! Converting a porch to either a screened porch or sun porch is a great project!

    Grab a friend, grab some cold drinks...let's "rip a board" or two!

    Step 1

    The same steps apply to building a three season porch as they do for building screen porches. However, because you will be replacing the screens with glass, frame support needs to be more substantial.

    Look at our guide to screened porch panels to determine which method is best for you. Your screening method will dictate how and what you use for conversion to a 3-season porch.

    NOTE Use our porch screening materials guide to determine the best screen material for your porch. Although screen material can come in widths of up to 9 feet, I don't recommend a width of over 4 feet as it is very difficult to stretch it properly if wider. Four-foot widths provide more than sufficient viewing area.

    Step 2

    Chances are you are not going to have glass from floor to ceiling. So when framing your porch for both screen and glass panels, I recommend you frame for standard sizes to minimize costs.

    Having glass panels made is relatively cost effective. Either purchase your screen frames or build them to the same size. However, you can also have non-standard glass panels made also which will increase your visual field.

    Do not make them larger than you can install/remove safely as necessary.

    OPTION: Instead of glass consider using acrylic panels or acrylic storm panels. Lighter in weight, they are easier to work with and look great. However, they do tend to scratch easily and can break if handled incorrectly. Consider using them as a knee-wall or to replace/cover the screens in colder weather.

    NOTE: Before planning further, take note as to where you are going to store either the screens or glass panels when not in use! We had to store over 35 glass panels (storm windows)- they do take up space and must be handled carefully! Perhaps you will have storage space beneath your porch (ensure you have easy access).

    Special NOTE: We had screens permanently installed on the porch. By doing so, we didn't have to store them. The glass panels fit in the same frames and were held in place with twist locks. We only had to store the glass panels.

    Step 3

    The framing on our porch was 2x4 and it worked great. The 2x4s gave plenty of space to hold both the screen and window.

    We also had wood panels to cover the bottom row of frames to use instead of either screens or frames. It offered more privacy and captured more heat in the winter.

    Step 4

    Add amenities. Consider installing an exterior fan or perhaps using a portable heater. Either one will help cool or heat the space appropriately.

    There you have it! Now you are ready for building a three season porch.

    Screen porch windows on beautiful home
    Screened porch windows - DIY Eze

    And more line

    Electrical Considerations When Building a Three Season Porch

    You may need additional outlets or lights on your 3-season porch because you will quickly use it as a room addition. Plan accordingly. Use our Guide to Porch Electrical Systems to help you assess your electrical needs.

    Extending current receptacles is a fairly easy DIY project that can be learned easily.

    Extending "external" receptacles is different than doing it inside your home; there are different code requirements you must meet.

    For instance, all external circuits must be protected with a GFCI (a Ground Fault Circuit Interrupter).

    This is the only device that will keep you (or members of your family and friends) from being electrocuted. Check out our Guide to Electrical Codes before you decide to do your own wiring. You may also need to pull a permit to do this - check out our Guide to Building Permits.

    No short cuts - do it right! If you want to do it yourself and aren't 100% confident in your abilities, contact a local electrician.

    I've gotten great assistance from them; many are willing to give you advice and/or be your consultant either for free or a small fee. Check around.

    Your local electrical codes inspector is also a great source for help and guidance.


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