How to Build a DIY Mirror Frame

DIY framed mirror hanging on a wall

The Spruce / Sanja Kostic

Project Overview
  • Working Time: 1 - 2 hrs
  • Total Time: 1 - 3 days
  • Skill Level: Beginner
  • Estimated Cost: $20 to $40

Unframed, builder-grade mirrors may get the job done, but they certainly leave something to be desired visually speaking. What if we told you that adding a custom-built frame was surprisingly simple? Not only is this the case, but framing out a wall-mounted mirror is an extremely budget-friendly way to decorate with mirrors and alter your space's aesthetic to whatever vision you can dream up.

By using a heavy-duty adhesive that bonds to glass, this project requires no nails, screws, or other fasteners to frame the mirror. Simply cut the boards to length, glue them in place, then finish to your liking. Give it a rustic edge, some coastal charm, or keep it polished to perfection. With this DIY mirror frame, the choice is yours!

Before You Begin

Before you run out and buy supplies, determine what kind of look you're after and buy materials accordingly. If you want a more rustic look, choose something like knotty pine. Like the airy, coastal look of a whitewashed frame? Choose natural wood with not so many knots. For a picture-perfect, traditional finish, look no further than primed MDF trim pieces. You can buy very detailed millwork, flat boards, or anything in between, depending on your desired look.

What Is MDF?

MDF stands for medium-density fiberboard. It's an engineered building material that is composed of wood fibers combined with a binder to create a strong, wood-like material.

Follow these steps to frame your wall-mounted frameless mirror and adjust them accordingly to suit your space and desired look.

What You'll Need

Equipment / Tools

  • Miter saw or miter box
  • Caulking gun
  • Tape measure
  • Pencil
  • Finishing supplies
  • Sanding block


  • Trim boards (adjust dimensions and style accordingly)
  • Adhesive rated for glass
  • Paintable caulk (if painting)
  • Preferred finishing supplies
  • Rag
  • Painter's tape


Materials needed for a DIY mirror frame

The Spruce / Sanja Kostic

  1. Measure Mirror

    Measure your mirror using a tape measure, then use these numbers to calculate how much trim to buy. The inside dimensions of the frame should be slightly smaller than the mirror to provide a gluing surface on the frame.

    Measuring the mirror to frame

    The Spruce / Sanja Kostic

  2. Buy Trim Boards

    Choose your trim according to your preferred look, sticking with boards around two to four inches wide for best results. Trim is sold in a variety of lengths, so factor in your cuts to minimize waste.

    Choosing trim boards for the mirror

    The Spruce / Sanja Kostic

  3. Cut Miters in Boards

    Using a miter box or miter saw, cut 45-degree miters on each end facing opposite directions. The long side of the top and bottom pieces should reflect the length of the mirror and the side pieces should reflect the height of the mirror. Once cut, use a sanding block to remove any splinters.

    Cutting miters in the mirror boards

    The Spruce / Sanja Kostic

  4. Glue Bottom Piece to Mirror

    Using a heavy-duty adhesive that can bond to glass, glue the boards to the mirror. Start with the bottom piece and apply a generous bead of adhesive near the outside edge of the board. This will prevent the glue from reflecting in the mirror once the boards are installed. Firmly hold the board in place for the time specified in the adhesive's instructions, then use painter’s tape to tightly secure the board in place until it is fully dry.


    Some heavy-duty adhesives can take a long time to fully cure, so be sure to read the manufacturer's instructions carefully before moving forward.

    Testing the boards on the outside of the mirror

    The Spruce / Sanja Kostic

  5. Glue Sides and Top

    Glue the side pieces in the same fashion as the bottom, using the edges of the mirror as a guide. For added strength, you can opt to glue the mitered edges of the boards together as well, being sure to wipe away any excess adhesive. Finish the frame by gluing the top piece in place.

    Gluing down the sides and top of the framing boards to the mirror

    The Spruce / Sanja Kostic

  6. Fill Imperfections With Caulk

    Once the glue has fully dried, carefully remove the painter's tape and fill any loose miter joints with paintable caulk. Wipe clean and let dry. Skip this step if you are using natural wood that will not be painted.

    Wiping the mirror clean

    The Spruce / Sanja Kostic

  7. Finish Frame

    Finish the boards in your preferred method. For a rustic look, choose a weathered stain color. If you desire a whitewashed coastal look, water-down white latex paint and apply a thin layer with a rag rather than a paintbrush. For a clean painted look, simply paint with your desired color of latex paint.


    For an even more custom look, enhance your mirrors with decorative hardware on the outside. Faux rustic nail heads and similar accents don't serve a structural purpose but can make a huge visual impact.

    Staining the mirror framing boards

    The Spruce / Sanja Kostic