Measure the fireplace opening and wall space
Choose the mantel style, size, and material
Check local building codes and clearance requirements
Gather tools and materials
Mark the mantel height and centerline on the wall
Locate wall studs and mark mounting points
Build or cut the mantel shelf, legs, and surround pieces
Sand all wood surfaces smooth
Apply stain, paint, or finish before installation
Install a mounting cleat or support board into studs
Attach the mantel legs or surround to the wall
Secure the mantel shelf onto the support
Check that the mantel is level and square
Fill holes and seams with wood filler or caulk
Touch up paint or finish after installation
Inspect all fasteners and confirm stability