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{DIY Sunroom} How to Convert a Porch to a Sunroom – Framing and Windows

This sunroom project is sponsored by Surplus Warehouse. All opinions are my own. If you are looking for building supplies at the best price possible—check them out! 

Like most things in life (and particularly in remodeling life!) things move a little slower than ideal. Exhibit A: our sunroom. If you recall, we partnered with our friends at Surplus Warehouse who were generous enough to help provide materials and funds for our DIY sunroom. We started work on this project months ago and thought we’d be able to wrap it up in six to eight weeks.

We were wrong. Thanks to a crazy rainy Spring in Texas that lead to flooding, outdoor work time was seriously limited—and the work that took up the bulk of our time was not the exciting high-visibility stuff. 

How to Create a Solid Foundation for a DIY Sunroom

Like everyone knows, to have a good building you have to create a really solid foundation. This was the least glamorous and most tedious part of the entire thing, TBH, but without spending time on this our entire project would be a failure. For us, this meant calling out foundation experts to examine the concrete pad to make sure it was feasible to use (thankfully, it was!).

Our next step was to correct the drainage issue. Since the concrete pad was low to the ground and a bit thin, we had to make sure when we had crazy rainstorms, water would not seep into the sunroom. This meant that we (okay…Scott) had to dig an 18″ deep trench around the entire parameter of the room. This is where we will add a DIY french drain system to direct water from around the room towards the downslope of our yard. I’ll be sure to share once we do! 🙂 

Building a Frame for the DIY Sunroom 

Now—onto the fun stuff! Once that was done, we could finally add our walls. The roof structure was held in place by a few vertical beams throughout the porch, but they were set several feet in from the edge of the patio. We wanted to maximize the room with as much square footage as possible, so we built an entirely new frame using 2 x 4 beams. 

First, we had to secure horizontal boards around the exterior of the concrete pad. This was done using a hammer shot tool. I’ve never worked with one before—it’s pretty intense! It uses gun powder and literally shoots into the ground. 

Once the framing base was complete, we added vertical beams about every 36″.

Framing for a diy sunroom made out of a covered patio

If you look above, you can see the former support beams still in the room, set a foot or so in from the new support. Once the new frame was up, Scott removed those using a combination of a reciprocating tool, hammer, and sheer willpower. 😛 Our construction manager approved. 😉 

Framing for a diy sunroom made out of a covered patio

Next, we had to make a final decision about the size of our windows before we could continue framing. I went back and forth for a few days—I was really torn! With the size of the room, we had already calculated and measured for 35.5″ wide windows. We decided to use windows without grids to maximize the view, but I was having such a hard time deciding which. 

DIY sunroom frame from a covered patio

The two contenders were the 47.5″ long window and the 59.5″ long window. I loved the idea of having long windows with lots of sunlight, but since the room is not very tall, that would take up the majority of the wall. In the end, we went with 47.5″ windows. This will allow us to use space under the window to create a built-in bench for storage and dining, and also cut down on the amount of heat and sun the room will get…remember, we are in Texas and it gets HOT!

We purchased the sunroom windows from Surplus Warehouse—they are SUCH a good deal! Each window was $121—an incredible value for all-glass windows without grids. 

New windows without grids on a budget

Once we had our windows we got to work with framing them in. This part went fairly quickly—we used 2 x 4 beams to create a support system under each window. Like anything construction—measure 300 times and cut once. 

how to frame in windows for a diy sunroom

We tested the framing on each second to make sure the windows fit. We did pretty good—we only had to re-do one section. 🙂 As you probably know, the open space on the end is where our door will go. 

Before we started installing windows permanently, however, we had to add some insulation. After doing a lot of research, we went with a foil-backed foam. This will help block and reflect heat—a definite must-have for those 110 degree summer days! 

Reflective insulation for the exterior of a sunroom

Then, it was time to install those gorgeous windows! 🙂 This was the best day ever—it really started to feel like an actual room once the windows were in. 

How to install exterior windows for a diy sunroom

How to build a diy sunroom - turning a covered patio into a sunroom!

So, that’s where we are at currently with our DIY sunroom! It looks so good! I’m really proud of our project. Here’s what needs to happen next:

  • The roof will likely need to be recovered as there are some spots it is leaking during heavy rainfall.
  • We need to wire for electricity in the exterior walls, then add drywall
  • Exterior siding and trim
  • New flooring – we are definitely going with a waterproof vinyl for durability. There are so many great options and finishes at Surplus Warehouse!
  • Then all the fun stuff – paint, decor, etc. 

I am so excited about this project. It’s fun to be at a stage with it where we are actually seeing big changes, rather than just shoveling dirt around (literally). 🙂 

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Tania Griffis is an accomplished writer, blogger, and interior designer with a Journalism degree from the University of Oklahoma. She started her popular blog, Run to Radiance, in 2011, demonstrating her design expertise through the personal remodeling of six houses to millions of readers across the globe.

Tania also owns The Creative Wheelhouse, a respected ghostwriting agency for bloggers, further showcasing her talent for creating engaging and informative content.

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  1. Wow, a DIY sunroom is a tall task, especially with the windows! Well done, there must be a lot of fulfillment completing a project like this one on your own as opposed to hiring.

  2. Do you have photos of the finished room (exterior and interior)? I am really interested in doing this project on my own home and would love to see the sunroom addition in its final form.

  3. Your porch roof looks really flat. What’s it’s pitch? Hopefully not completely flat so water hasa way to run out. You said you had problems with leaks at first? Hope it’s working for you, just wondering.

  4. Question this home came with a covered patio. It was made into a sunroom. My concern is the cement is poured with a slope. How do I make it flat?

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