Curious how much more they will run

Ask your window supplier -- sometimes you need to communicate with a person.

A 7' tall window cost one foot more than a six foot tall window, multiplied by the tempered glass factor.

Revisit your needs for any ceiling height over nine feet. If cost has become a concern, your selection of a canned plan or your designer's "designing within a budget" needs development.

Are you getting builder basic vinyl or top of the line Marvins?

Do you need hurricane/impact rated?

There is a wide range in prices.

I have 6'9" tall Marvin push out casements in my dining room with 12 ft ceilings. They were supposed to be taller, per the plans, but Marvin would not make them any taller. Don't remember the reason now, but might have been due to FL hurricane/impact codes.

How tall your windows are and how high you place them, really depends on the intended use of the space. I don't have any that I would have wanted placed 1 ft off the floor.

As one data point for fixed glass picture windows - the cost was roughly $500 for a 2.5' wide by 8' tall window.  As a comparison,  a 6' wide by 2' tall fixed glass window was nearly $400.  So at least for fixed glass, it's not that much more to go with a 7' or 8' tall window.  I think window cost is more a function of overall size in terms of square footage.

You need to specify the width, the materials, the U or R factor, the type of window (fixed or opening) and whether casement, single or double hung etc.

That said, here's one from a recent Pella quote:

That's US$5,719.99.

As noted above, speak with a salesman.

To get the best prices, you present your architect's window schedule. If you're just doodling around with ideas, consult your architect.

There is no simple answer to your question, Any and every manufacturer will be different depending on many factors. I would never get even a 6'; tall window in a builder grade product just because, so brand and series will make a huge difference as well.

That's custom window territiory and you'll need a quote from a supplier who can handle glass and framing that large. Your builder should have a good supplier for this.

If this is still in the planning phase please rethink 15' high ceilings anywhere. IMO 10' is the max for keeping heating and cooling costs down and those relly high ceilings affect sound and air movement all kinds of things for no real purpose . As for the windows no one here can tell you that that is the job of supplier or your builder.

Since windows that tall have taller sash and sills, a 12" rough opening above the finish floor might put the bottom of the glass at 18" but make sure that is the case to avoid the cost of tempered glass.

We had two 66 1/4"x96 3/4" tempered glass that were about $2400 each from Sierra Pacific.

It appears cost is an issue, and ceiling height and window height and door height are the only clues provided about the OP's house. It is for the OP to decide on where to save and nobody is forcing her, or anyone else, to have a certain ceiling height (which effects the window size), there was only advice given about areas of potential cost savings. Some designers build monuments to themselves without concerning themselves with their client's needs; Spirits soar while bank accounts crash.

The OP did not ask for advice about cost savings, only the price for 7 foot windows. There's no mention of designers either, let alone "monuments". A high ceiling in no way implies monumentality, and there's no reason it has to break a budget either.

Are your panties in a twist again?

One other note, with 10 ft ceilings, I like having 6 ft tall windows set at an 8-ft header height. This leaves 2 ft above and 2 ft below. Your idea of using a 7' window and having the bottom of the window 1' off the ground seems a bit off to me.

Are your panties in a twist again?

Huhh?

Nobody needs two FEET of header above a window to hang curtains.

You are correct in thinking about the look you want,

An example of what can happen?

Windows set in a nine foot ceiling! A whole lot of header...awful. Decorative nightmare.

Before. where windows SHOULD have been set a foot off the floor

None · More Info

After.... disguised header and much reduced "header".

The error in the first pic, was using the same placement as family room and kitchen -but those windows? Had a transom above : )

Traditions refined · More Info

Is there anything worth seeing outside the window? Or just your neighbor eating ice cream in his shorts? Size of the windows is less important than the view and light from the window. This is why mid century homes often had clerestory windows up high, that let in light, but not the view of the busy street right outside the front door. If you have 20' between you and your neighbor, big windows will not be a positive.

Are these operable windows? We put 22 storefront fixed glass windows in, 10 of which are ~38"x96", all double pane, low e coated, tempered, etc and the total cost for the glass was in the $12k range.

OK so remember by placing your windows 18" above the finished floor you avoid the requirement for tempered glass. That's a cost saving.

My home has vaulted ceilings in the public areas but not in the private areas which really helps on material costs and HVAC.

I’m not sure how to reply to an individual comment, but to those who actually helped answer my question, thank you so much!!

The width is 32”. I actually like the look of 1’ off the floor and 2’ above (again, for drapes, and yes, I like the look of drapes). ((: I will however rethink 12” vs 18” off the floor if it means I’ll have to have tempered glass. I just assumed they would have to be tempered anyhow w/the large size, but maybe not per some of the comments.

Yes, I plan to speak to a local supplier as well. Of course. I just wanted an idea if we’re talking a thousand dollar difference per window to go from 6’ to 7’, or less of a cost difference. That is a big difference. A couple to a few hundred dollar difference is not a deal
breaker.

The 15’ tall walls are also a cathedral open ceiling.

As far as “is it worth looking out of, or my neighbor eating ice cream” or whatever that comment was, lolol. Yes! It is so worth it. We’re building on 40 acres. We have horses, we have a large pond, creeks, trees, pastures and undulation—a magical view. Yes, yes it is worth it ((:

Also, thank you for all the comments! Positive, and negative. I had no idea I’d get so much feed back. You all rock!

" I had no idea I’d get so much feed back. You all rock!"

That's great! And you're building a house too so I'm sure there's lots of valuable advice you can offer others. That's what makes the forum work as you've found out. So don't hesitate to jump in and help.