How to Build an Extended Fireplace Mantel

Add height to a room with these step-by-step instructions.

Font
  • A
  • A
  • A

E-mail This Page to Your Friends

x

All fields are required.

Separate multiple e-mail addresses with a comma; Maximum 20 email addresses.

Refresh

Sending E-mail

Sending E-mail

Or Do Not E-mail

Success!

A link to %this page% was e-mailed

This project creates the illusion of additional height, and it's great for accentuating a stone wall if you happen to have one.

Materials and Tools:

tape measure
router and bit
nail gun
jigsaw
¾-inch medium-density fiberboard (MDF) with the right dimensions to accommodate the specific mantel
T-square
large round plate or bowl
wood glue
caulk
paint
paintbrush

Steps:

1. Measure the height from the top of the existing fireplace to the ceiling. This will be the measurement used for the height of the MDF.

2. Measure the width of the existing fireplace.

3. Using the T-square, transfer the dimensions onto the MDF.

4. To create the crown and arch of the top of the mantel, you will need to decide how far to extend the width and then mark the MDF. This measurement needs to be equal on both sides.

5. Decide the height of the crown and mark it on the MDF.

6. Place a large plate or bowl upside down and use its arc to connect the bottom of the crown to the inset of the mantel.

7. Use the jigsaw to cut out the frame drawn on the MDF.

8. Any accent pieces can be cut out from the scraps of MDF and nailed to the face of the mantel if desired. For the pictured project, four symmetrical stripes were cut out and attached with the wood glue and the nail gun. We then cut out a diamond and centered it in the middle of the mantel.

9. Using a router, finish off the outside edges of the frame. Be sure to leave the top and bottom unfinished. This will help to create a seamless transition between the old fireplace and the new mantel. If desired, the accent pieces that have been attached can also be routed.

10. Rest the entire frame on the existing fireplace.

11. Run a bead of caulk across the top and bottom of the frame. This will seal it into place.

12. Paint both the new frame and the fireplace.

We Recommend...

How to Build a New Fireplace Surround and Mantel

How to Build a New Fireplace Surround and Mantel

A dated fireplace is given a British Colonial look with the addition of staircase posts, molding and a coat of fresh paint.

How To: Kirei Board Fireplace Mantel

How To: Kirei Board Fireplace Mantel

Carter Oosterhouse shows how to use an environmentally friendly lumber to craft a mantel.

How to Build an Under-Stair Vent Cover

How to Build an Under-Stair Vent Cover

Build an attractive and functional accent under a floating stairway.

Advertisement

HGTV Inspiration Newsletter

Create your unique, personal style with advice and inspiration from HGTV.