By Gene and Katie Hamilton
The small 8-sided window with a strong resemblance to a stop sign serves a purpose often needed in today’s home. It’s ideal in a tight spot where a ray of daylight is needed to brighten a dark space. It is frequently used to add light in an entry foyer, at the top of a staircase landing or in a small bathroom, all places where it can add architectural interest to an otherwise blank wall. When ventilation is needed, an opening unit is a good choice.
Octagon windows are sold at window, lumber and home centers as fixed and opening units made of wood, aluminum and vinyl. A carpenter will charge $486 to install a 24-inch opening vinyl-clad unit with insulated glass, which includes the labor and the window. A handy homeowner with carpentry tools and experience can buy the unit for $175 and install it, pocketing a 64 percent saving. Don’t tackle this job unless you are competent, because it requires cutting a hole in the siding of the house. And don’t even think about doing it yourself if the house is made of brick or stone; definitely hire a contractor who has the tools and experience.
Plan to position the unit between wall studs; you’ll need an electronic stud finder to locate them. The job involves cutting a rough opening, positioning and adjusting the unit with wooden shims so that it’s level, and then fastening the unit to the studs with screws and caulking around the interior trim and siding.
SFGATE has this advice about How to Install an Octagonal Windows.
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Home Advisor, a free referral service that matches homeowners with local contractors.
Wrapping up, given the average cost to install an octagon window you can compare the price of a contractor’s bid with doing it yourself. For a local cost input your ZIP Code.
Improvement and Repair Cost Updated 2020