I am no expert on such things, but as I look at the close up of your home and at the existing window, I just don’t think it would fit very well.

As you said, that’s a lot of money for an improvement that you aren’t sure about.

It might add some interest to the exterior. But, of course, you'd have to groom those plants.

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View of Box Bay Window from Front Entry Walk · More Info

But then, it might look like a greenhouse slapped onto the side of your house.

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In my opinion the look gained on the exterior would not be very different than what you have currently. The value in the change would mainly be determined by the interior window seat space and light gained from the side windows. Best of luck.

IMO it's not worth it just to get a window seat that likely is not deep enough for anyone to use. a 12" window seat is simply a deep ledge and not really a seat anyone can sit upon.

The construction issue is how to address closing the box at the top and supporting the box at the bottom because this becomes a heavy element. I'm assuming you have no additional brick to create the support

Though this square bay is floating, it's not very deep for a window seat.

What is driving your desire to do this? A need to change the window or a desire to break up the right facade a bit? If that is the case, you could consider the idea of breaking up the large expanse of one window with a three window unit. A fixed, larger pane in the window, flanked by two casements that are narrower.

How deep are your dining chairs? Any thing less than that is not useful for most butts. If just trying to change the look or increase curb appeal, you need to focus on landscaping, removing the overgrown evergreens and dividing/transplanting the hydrangeas and clearing out the visual clutter at the front door..

It’s a situation in which landscape is the issue not the house. The windows are blocked, the entrance obscured and it’s all much too dense. More value to hire a designer to redo the yard.

I agree the landscaping is over powering the house and IMO you gain nothing from adding a bay window and this house really does not suit one any way. I would need to see how a window seat is worth this expense since they are used rarely in most cases.

Sounds like a 12” window ledge, designed especially for the household kitties to take a nap on.

I have to agree with the others about the landscaping. Those hydrangeas are lovely but poorly placed and too big for the front of the house. The evergreens, too. Overgrown and past their prime.