Natural Light: Arched Window Installation

Steve Watson and crew show how to bring light into a bedroom with a new arched window installation.


After: A carefully placed arched window goes a long way toward giving the bedroom space a whole new look.

After: A carefully placed arched window goes a long way toward giving the bedroom space a whole new look.

Related To:

Steve Watson and the Don't Sweat It team show the Siano family how to install an arched window in their exterior wall, create a kitchen pantry out of an existing half wall and ixnay the bidet.


Before: This master bedroom needed more light and some general dressing up.

Before: This master bedroom needed more light and some general dressing up.

The Siano family has been in their house for about a year, and they've tackled a lot of projects in that time. But there's still work to do. The master bedroom is in desperate need of some natural light, the kitchen suffers from limited cabinet space and there's a bidet in the bathroom that serves only as a fish bowl.

Materials and Tools:

2x4 lumber; 10-ft. lengths (10 pcs.)
2x10 lumber; 10-ft. lengths (2 pcs.)
window and casing
insulation (1 roll)
1/2" drywall (1 sheet)
1/2" plywood (1 sheet)
table saw
circular saw
electric miter saw
reciprocating saw
air compressor and hoses
finish nailer
framing nailer
drywall tools
caulking gun
measuring tape
painting supplies
safety glasses



1. Before you begin demolition, using the pre-made arched window, mark the wall for installation. In this case, the placement was based on architect's drawings.


2. Using a drywall saw, carefully cut away the drywall to expose the studs.

Important: Exterior walls of homes are always load-bearing, so you may have to install a header to support the weight of the window. Be sure to check the exterior siding and how you will cut into the house.


3. Remove the insulation and carefully mark the window shape on the exterior sheathing.

4. Use a reciprocating saw to carefully cut out the window hole.


5. Cut away and replace the existing framing with the necessary members, again based on the architect's drawings.

6. Carefully insert the window in the new opening, check for level and secure into place with screws.


7. Cut and install drywall and exterior siding, installing J-channel if necessary.

8. With the drywall installed and patched as necessary, attach the window casing, then caulk all seams and nail holes.

9. Prime and paint the interior walls.

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