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How to Build a DIY Fireplace with Hidden Storage

Materials:

Tools:

Total Cost: $300-$800 depending on the type fireplace insert you choose

Step 1: Plan + Measure

Decide how big you want your fireplace to be based on the size of your fireplace insert. If you are wanting to build in secret storage on the inside make sure you account for that on the sides of your insert so that you have enough room. I recommend mapping the size out in the space using painters tape to get a visual representation of how big your fireplace will be that you are building. Map it all out on paper and write out your measurements before heading to the store. It will make things a lot easier if you can keep this paper with all the details on hand throughout your project to refer back to.

I recommend using a Kreg Jig to create pocket holes to secure your boards together when building.

Step 2: Build the Face Frame

You are going to start by building the face frame of your fireplace. Start by building the main rectangle piece to the size you would like your fireplace to be. Once this is complete, work inward to build the frame that your electric insert will sit on. I recommend laying your fireplace insert down on the ground so you can visualize where you would like it. I decide to center mine horizontally and vertically. Once you decide the placement, add your support pieces of wood that you will sit your fireplace frame on. Most will come with instructions but are all pretty much the same when it comes to the install. You want to have a support piece of wood that the fireplace will sit on and then two vertical boards that will support the sides. You will use these side supports to secure the front of your fireplace.

Step 3: Build the Side Panels

Using your 2x2s build the side panels. You can simple create two rectangles that are the same size. I recommend making sure these are square when you build them. I made the mistake of not checking that everything was square and just eyeballing it and it made things a-lot more difficult when I started building in my inside storage cubbies.

Step 4: Attach the Side Panels to the face frame

Once you have your two side panels built as your face frame, simply attach them together to create the base of your fireplace. Be sure to drill pilot holes before screwing so that you don’t split your wood (I made this mistake the first time and had to rebuild one of the side panels).

After you attach the side panels and the face frame you will want to add some support across the back. I used my 1×6 board and left over 2x4s to create 3 supports that ran horizontally across the back. I would do one near the top, middle and bottom to secure it evenly. You could also use these support beams to secure the fireplace to the studs of your wall if you aren’t wanting it to be mobile.

Step 5: Add in your storage

I decided that I wanted to build in some custom storage into our fireplace. This is totally optional. You can skip this step if you aren’t wanting to add storage. I cut plywood into squares to make my shelving and screwed them in from the outside. Make sure they are level as you work. After my shelves were attached, I cut sheets of underlayment to use for the sides of my cubbies. I secured these with my nail gun and just measured for each one. This took the most amount of time. Looking back, it may be easier to do all of the sides in big rectangles and then add in your divider shelving instead of having to cut each individual square, totally up to you!

Step 6: Finish Work (Caulk, Wood Fill, Etc)

After all of my sides and shelving were in and attached, I caulked all of the edges, wood filled any rough spots and then sanded everything smooth once it was dry. The finish work is an easy part to overlook but it truly is what takes the DIY to the next level and makes it look professional. Once everything is painted, you won’t even be able to tell where any of the seams are, etc.

Step 7: Attach Doors

The next step is to attach the doors. I am using the underlayment that I used for the walls of the cubbies to make my doors. You want to use a thin piece of wood here or else the doors will be too thick/heavy when you attach the shiplap. Cut your underlayment piece to the size you want the door to be. Install your piano hinge so that the door opens and shuts to your liking. I installed the piano hinge toward the back of the fireplace so that it would swing open from the front toward the back. Repeat this step on the other side as well.

Step 8: Shiplap + Corner Piece

Once you have all of your doors attached and functioning, it is time to wrap the entire fireplace in shiplap. Start on one of the doors and working top to bottom, attach your shiplap with your nail gun. (make sure you use short enough nails that they don’t pop through the underlayment) We will be attaching a corner piece to the door of the shiplap to cover the edge so just make sure your shiplap is flush with the shiplap on the face fireplace. Continue working around the fireplace until all of your shiplap is installed. Remember, we will be installing a corner piece so your corners where the sides and front meet don’t have to look perfect. 

Take your corner piece and attach it to the door so that it over laps the side panel and front face shiplap boards. It works best if you can install it while the door is shut to make sure the placement is correct. I secured mine with a few brad nails and some wood glue to make sure it would stay. This is what makes your doors look hidden when they are closed.

Step 9: Install the Fireplace Insert

Place your electric fireplace in the space and secure it per the instructions. The fireplace insert I chose doesn’t get hot in the back so there is no danger having my hidden storage. Make sure that the fireplace insert that you choose doesn’t radiate heat from the back.

Step 10: Build Mantel

I built my mantel out of a sheet of 1/4 plywood but you can use whatever you would like. You are going to cut 5 pieces; top/bottom (same size), two side panels (same size) and the front panel. I added two dividers on the inside of mine for additional support but this is totally up to you. Using your brad nailer and wood glue, attach the pieces together so that you have a rectangle (everything attached besides the front panel). If you want to have hidden storage in your mantel you can install the surface mount soft-close hinges which will allow you to open and close the front so you can store your cable boxes, cords, etc. If you don’t care about the storage, you can secure the face piece on with your nail gun.

Step 11: Paint/Stain

Paint and stain however you’d like and voila! I used the color grizzle gray by Sherwin Williams and the stain on my mantel is 1 coat of Provincial and then 1 coat of Antique White. Make sure that you use a wood conditioner/pre stain before staining to ensure that it goes on evenly. This will take 5 minutes and you will be SO glad you did it.

 

Come Stay Awhile by Amanda Vernaci | Modern Farmhouse DIY + Home Renovation
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15 COMMENTS

  • Angela

    How did the cost for this not come to more than $600? The fireplace insert alone is almost $600. Do you know something I don’t?

    • Amanda
      AUTHOR

      It was a typo! Just updated. The materials for the base are around $200-$300.

  • Siden Peebles

    Hi!

    We’re your measurements for each of the wood frames the drawing on the first step or were they different?!!

    • Amanda
      AUTHOR

      Those were my measurements 😉

  • Stephanie Wilson

    If this is sitting flush against the wall will the doors still open or does it need to have a small gab to allow for them to open?

    • Amanda
      AUTHOR

      Because I used a piano hinge, it can be flush!

  • Dan

    Can you verify this is 3.7666 Feet tall (45.2 inches)? Just want to be sure I’m reading your measurements correct. Going to be hanging a TV before building this and want to be sure we are good to go.

    Thanks!

    • Amanda
      AUTHOR

      Just measured! The finished fireplace is 43 inches tall including the mantle!

  • Megan

    Beautiful! How did you apply the paint – brush or roller? If you used a roller, what kind specifically? We’re currently doing an interlocking plank wall in the bathroom and when we try to roll the paint on it leaves a texture. We can’t get it smooth. Any tips? Thanks!

    • Amanda
      AUTHOR

      Hey! I recommend using a brush for the cracks and a roller for the smooth parts. Get a smooth foam roller so it won’t leave any brush strokes! Make sure that anytime you use the brush, you roll back over it immediately so you don’t have dried brush marks!

  • Isabelle

    Hi! Love this idea and it inspired me to start my DIY journey. woot woot.

    I was wondering how you applied the stain? (Dark first vs Light? or vise versa) I really love the color of the mantle as it works with my current finishes and am trying best to replicate it.

    Additionally – how did you go about painting the inside of the of hidden shelving? Did you stain the inside of your mantle (aka the hidden storage?)

    Thanks you so much for your time and help – and kudos to you for doing such an awesome job!

    • Amanda
      AUTHOR

      Hey! I applied the darker stain and then the white wash on top. One coat of each. I probably should of stained/painted the inside but because no one will see it, I decided not to. It’s just the raw wood!

  • Jennifer

    Do you think I could put a tv on the mantle?

    • Amanda
      AUTHOR

      Mounting it would be ideal but if not, yes!

  • Angela

    Could “feet” could be added onto the bottom of this so it doesn’t sit on the ground? This would go in front of our cold air return so it would need to be off the ground. My husband doesn’t think you can add “feet”.