How to Build and Install an Eyebrow Dormer Window

An eyebrow dormer window is an expensive option, but it does give the home an exquisite architectural design due to its curvature. Building an eyebrow window is not a very easy task and can best be left to a professional carpenter; however, it can be a satisfying DIY project for people with good woodworking skills.

Tools and Materials

  • Eyebrow Window Design
  • Miter Saw
  • Circular Saw
  • Framing Boards
  • Stain or Paint
  • Glass
  • Nails
  • Hammer
  • Silicone Caulk

Step 1 – Determine the Eyebrow Window Design

Obtain an eyebrow window design to build. The curve of the design will be used to determine the curve of the eyebrow dormer. However, if the dormer is already created, then the window to be built will need to conform to the shape of the dormer.

Step 2 – Building the Support Structures

The framing for the window opening may require the help of a professional carpenter. This can be done either during the construction of the house or during a renovation. Make sure that the framing will conform to the design of the window.

Step 3 – Building the Window

After the framing supports are ready, proceed with the actual building process for the window. Determine the dimensions of the windows. Take special note of the curvature on the top portion of the design (aka, the header).  The header can be made out of plywood because it is easier to curve. However, the header can also be cut from a piece of wood using a circular saw. If not, have the header cut by a professional woodcutter.

Cut the wooden pieces according to the design. Use a miter saw to create 45 degree cuts. Nail the wooden window frame pieces into place and sand all the rough edges. Do not install the glass just yet.

Step 4 – Painting or Staining

You may either paint or stain the wooden window frame. To do so: coat the frame with a primer and allow it to dry. Cut one or two coats of paint afterwards and wait for the paint to dry. Or, apply stain as an alternative. When staining, it is best to use a sponge and apply the stain using a circular motion. Apply thinly first. Darken the tone gradually by applying several coats until the desired color and tone is achieved.

Step 5 – Installing the Glass

Take note of the dimensions of the window and bring it to a professional glasscutter. Glass cutting requires some degree of skill because of the curvature. Position the glass into the internal opening of the window frame. Apply silicone caulk around the glass to ensure a tight fit. Attach window trims to keep the glass in place.

Step 6 – Installing the Window

Slip the window frame into the window opening of the eyebrow dormer. Nail the window frame to the supporting structures of the window opening. Make sure that all corners are secured tightly into the window opening. Run a bead of silicone caulk in between the window opening and the window frame. Remove any excess silicone. Wait for the silicone to cure. Recheck if the window is attached securely to the window opening supports.