How to Install a Bow Window

How to frame a rough window opening, install a new window, trim out the interior and exterior around a new window, plus all of the finishing.

Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

  • Hammer
  • Tape measure
  • Circular saw
  • Stud finder
  • Caulk gun
  • 4-in-1 screwdriver
  • Cat's paw
  • Chalk line
  • Level
  • Extension cord
  • Dust mask
  • Hearing protection
  • Stepladder
  • Pry bar
  • Reciprocating saw
  • Safety glasses
  • Sawhorses
  • Sledgehammer
  • Speed square

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

  • Window
  • Flashing
  • 2x4 lumber
  • 2x6 lumber
  • Laminated headers
  • 16d nails
  • Shims
  • Drywall
  • Eye hook
  • Cable clamp
  • 10d finish nails
  • Insulation
  • 3/4-in. plywood sheathing
  • 1x2 cleats
  • Plastic cap nails
  • 4d galvanized nails
  • 3-1/2 in. drywall screws
  • Caulk
  • Exterior trim
  • Interior trim