Extension Jamb for the Round Windows

The Glade (our house) originally had a round window in the bathroom.

The original round window is on the right above the porch and one of the new ones on the upper far left of the new addition.
The original round window is on the right above the porch and one of the new ones on the upper far left of the new addition.

With the renovation we added 2 more bathrooms and two additional round windows.

Both new bathrooms have bird's eye windows which have a special framing. They fit inside the square made from 2" by 6" studs.
Both new bathrooms have bird’s eye windows which have a special framing. They fit inside the square made from 2″ by 6″ studs.

The original plan used 2 by 4 studs for the exterior walls. Due to building code and our choice of insulation, the walls were built with 2 by 6 studs.

Both new windows open by pushing out on a lever.
Both new windows open by pushing out on a lever.

The round windows would have fit perfectly in the original plan but now they’re about 2 inches too narrow.

The inside of the window with the screen.
The built-in jamb is made for 4″ thick studs plus drywall.  We’re about 2 inches short.

I had to order jamb extenders for the 2-foot-diameter round windows so the interior trim can be applied after the tile is set. (Both windows are in a shower.)

The round window in the master bathroom shower will be trimmed exactly the same as the window in the conservatory.
The round window in the master bathroom shower will be trimmed exactly the same as the window in the conservatory.

I checked all possible vendors because a simple circle of wood varies greatly in price.

  • Direct e-purchase sells a woodgrain polyurethane extension jamb for $66.
  • Menards sells a molded polyurethane model for $93.
  • B&B in Ohio sells wood models for $137.
  • Nu-Englander, from whom I purchased the windows, charge $195.
The conservatory bathroom round window faces the street.
The conservatory bathroom round window faces the street.

I have ordered 2 round window extension jambs from Beacon Hill Supply in Ohio at $107 each (marked down from $136 each). Maybe a large embroidery hoop would have worked.

Here's what an extension jamb looks like. How can it cost over $100?
Here’s what an extension jamb looks like. How can it cost over $100?

The lead time is 3 weeks.  Let’s see if they get here at all.

Does price of things dismay you?

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Author: Jo

Welcome to The Glade, where the second generation of renovations has just begun and the mania about our home, music and other passions fill our days and nights. We’re Charlie and Jo in the music world; Mary Jo and Charles to family; and JoJo and Charlie to each other. We are renovating a midcentury house in a Victorian historic district where we want to live there the rest of our lives. It's a 1946 house located in Maryland. We were married in this house. Thus far (pre-blog) we refinished cabinets, added a window seat (still working on the cushion), rearranged a wall in the guest house due to sink/vanity replacement, planted a vegetable garden, and other quick and not-so-quick fixes. So this latest zeal for construction is the result of my having lived here since 1997 and feeling a need to ready the house for the next chapter and beyond.

4 thoughts on “Extension Jamb for the Round Windows”

    1. Our carpenter who can make almost anything suggested we buy the extension jambs. Then I read up on other people’s dilemmas with the same issue and knew making them would end up being a problem. Hope they show up and are perfect. Expecting the best outcome. Jo

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