I don't know. Perhaps check with a window company in your area.

"B" as it is more window units and the transom is mulled which is a bit more work in addition to the material.

IMO you get windows to suit the house so the cost is an issue for sure but I think how the house and other windows are designed is more important . So post some pics of the house and where these would go.

More units = more cost. Option B is going to be more expensive.

You never know for sure until you get a quote from your window manufacturer.

"You never know for sure until you get a quote from your window manufacturer."

Simple math, more windows, more frames more labor, guaranteed that "B" will be more expensive, every brand, every day. And both myself and Windows on Washington are in the window and door business and have lived this.

Thanks everyone! Just curious, does 'most units=more cost' apply to fixed windows as well? Will 'A' still be less expensive compared to 'C'?

Each unit, whether part of a mulled set or stand alone, has a specific and tangible manufacturing cost. A large single window of size "X" will cost less than two windows, mulled together, to create size "X".

Just look at the number of frame and sash spars and the more you have, the more it will cost. Mullions cost money as well.

you also have the varible of tempered glass requirements.Example A could require tempered glass and B may not.

Installing windows as single may be cheaper fir the window cost itself , but can cost more overall since it requires more framing and trim work.

Very simple answer, MYM and WoW are spot on. More units = more expensive. Other factors can mitgate the difference to some degree, but it would be extremely rare for those factors to result in a bank with fewer windows being more expensive.

Tempered could be at play as well if you didn't have to temper the two ends. That said, I would never sell a window that was partially tempered with a shared bottom edge.

So if you have a mulled window that is within 24” of a door you would temper the entire bank and a transom that is way clear of 5’? whith that school of thought why not just temper everything?

"with a shared bottom edge."

I would take that to mean he would not temper the transom only the bottom "row", so to speak. I may be incorrect though.

I would temper all the sections that have a shared "bottom edge". In this application, I would temper the middle (required by code) as well as the operable sections. They would not be required given their less than 9 sq/ft (in all likelihood), but I would not want a center section to be tempered and the edges to not be tempered.

Thank you all. I will probably go with 'A' for the breakfast nook.

I am still deciding on the bedroom windows. Any thought on what type of window will look good with window seating? How about 6060LS ?