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Kelly Wow, that's a lot of windows. I am not sure of your budget, but i think Roman shades are the way to go, unfortunately they are not inexpensive if the windows are not standard size. Fabric are the most expensive and block light well and can be insulated. Also, you can do any color or fabric. A natural woven shade can be found anywhere i.e. Home Depot, and they are not too bad in price. It would be a clean look and easy to keep away from the radiators. If you use the natural woven- You could add some panels along the sides of the windows to soften the room. It's hard to see the radiators in the pic. You can do individual for each small window or one large. All those windows are a project. I recommend getting a couple of options and hang them temporarily if you are hesitant on what to do. Pearson's Room Enviable Designs Inc. hSalon Hollywood Residence Architecture and Interior Design Classic Southern Shingle Style Home on Lagoon East Side Eden

JMittman Designs I would consult with a local window treatment professional for these windows--as most likely, they will need custom treatments. If it were my house, I would consider roman shades, one shade on each window, inside mount--if there is room. Woven wood shades would work as well. Do you need privacy? It is hard to make out the tops of the windows on the doors. I think it would be nice if you could hang panels from the top there to disguise that unusual curved top--the panels could cover some of the side glass.--you would need at least 2 width panels there.
Can we see the rest of the room/windows?

KPB Thanks for feedback - the dark along floor below windows is all baseboard heating, so the only place for panels without heat issue is alongside doors. I was concerned that individual romans would be busy! I'm adding some more photos - same windows on the other side of doors. Overall room is 30x30 with lake view - combined dining/living room

jdforney I agree with roman shades. Flat romans would look great, maybe in natural linen or white linen. It won't bee too busy in a solid. You could put panels on the sides of the doors if you want or just leave those without any curtains.

Lovely space & I'm sure it's a fantastic view!

JMittman Designs KPB--I thought the same thing about individual romans and being busy as those indivual windows are so narrow. Looks like a spectacular space.

Kelly It won't be busy in a neutral color, something in the tones of the woodwork- you can't do anything but neutral for so many windows...it would look too busy even to do a patterned curtain. The Romans are simply to provide sunlight reduction, warmth, cooling from the sun and privacy.

MyCraftWork, LLC Lovely hardwood floor.

Cheery Curtains What about curtains on some windows and Roman shades on other windows? The curtains and Roman shades are suggested to be in the same or similar fabrics. Neutral colors must be better.

Hope this will help.

Shobha Bhushan Use curtains like china silk in dark green which has a overlay of lace cut work highlighting the dark green.
Use some window treatment for the area above the main framework.Make sure it blends in with the floral patterns of the curtains.This is the most inexpensive idea ,later you can decorate the room

Cheery Curtains Again, some curtain designs that may give you some inspirations.

Shobha Bhushan Sorry these are not the type I am referring to

KPB thanks for the ideas - kklinton it won't look like a big dark whole with romans near the woodwork tone?
thinking of warming up the wall color to bm vellum or sw ivoire.

Mary Dancey Interiors Would you consider painting the windows and trim white and possibly the ceiling? Off topic I know but this would go a long way to help lighten this room up and take the focus off the wood.

Kelly I guess it depend on the fabric you use, there are so many options. I just think it will look silly to have curtains come just to the bottom of the windows or to the top of the radiators. I personally do not like valances- but that's an option. You just have to decide what your goal is in dressing the windows. If you do not need to block light or keep the room warm- then go with a sheerer shade. You said you had the option to put curtains on the doors, that will help. And yes painting the walls a different color would be wonderful. It looks like you have a wood ceiling, your eye is not going to go to the windows, it's going to go up. Gorgeous! Right now you are looking at a big empty box. So, yes, it can seem like romans could look boring, but once you add area rugs, art work, lighting, furniture etc the room will look completely different. The bottom line is though, you have to love it.

Gabberts Design Studio I would suggest roman or roller shades, mounted on the inside of your windows. Having all the window and door treatments the same will create a more cohesive feel.

KPB thanks kklinton for your feedback - love your photo ideas. Im not a big fan of valances only either (without panels) and the top wood trim is decorative. I was already in search of a 60" round dining table for this corner (and a new chandeleir) to soften this 30X30 box. Mary Dancey - Big adirondack style great room with timber beams and wood ceiling, stone fireplace and loft so I don't think painting woodwork is an option. Thanks so much for your ideas!!

JMittman Designs Thanks for posting the additional photos. You definitely have enough room to do inside mount roman shades, and again, I would do one on each window. I imagine they will be raised and lowered frequently and having only one cord to pull up and down will be more efficient, plus, you will not have to worry about multiple cords tethered to your woodwork with 4 shades on one window. If your crank handles would interfere with the bottom of the shades, you can replace those with much smaller T cranks. Cordless woven wood shades would be a great look too. You've been shown some nice inspiration photos above. Hard to suggest fabrics without knowing your furnishings. How about a linen, or linen look?

Shobha Bhushan Transparent curtains so that you can look out would be my suggestion provided you have privacy around the outer space.