First, what do you need light for? Do you do paperwork? Is your desk in your window? You'll be getting afternoon sun. I'm recommending LED lighting to people, but Fred says it has a way to go in brightness and affordability. I recommend sky tubes to homeowners. I've had 2 in one of my houses.

Michelle, I'm not a builder but am building with hubby, a single storey limestone home. Our daughter built a two storey limestone home just down the road, that hubby also built for her and the extra foundations she had to install would be at least twice more than we have for our single storey, not to mention that there were allot of short walled founds leading off the perimeter of her home to assist in less likelihood of wall roll out and the inspector called it. Cost for you, will depend on whether you have adequate foundations to carry a second storey and usually that is never the case. All the lower walls will need double the support and it usually has to carry on down to the foundations, depending on whether you have a solid concrete slab or concrete stumps that are accessible. This would mean most of the plaster being removed and hoping that you find no nasty surprises as far as the condition of the existing frame in the home, the builder would as I mentioned, have to add structural supports to carry the second storey. Most often, second stories are built with a hardiplank type exterior and certainly not brickwork as you would then difinitely have to have extra foundations in for such a reno and you would have to start asking yourself if it isn't better to demolish as this type of reno can be extremely costly. You might be lucky but probably highly unlikely, to have adequate structional integrity to be able to add a second storey, without everything I have mentioned to be skipped in any way. I hazzard a guess that such a reno would cost you $250,000+ and maybe more. Would love to know what you finally decide to do and your builders estimate. Good luck. Cheers, Barbara

the Measurements for each of the windows is on the left side. There are 4 corner windows (1-8 on the list) and 2 that are not part of a corner. Thanks!

Both so close it doesn't matter. Aluminium is better if it's thermally broken.