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.

This is the placement if the door and window, and the bed size is double, and I need to fit something to store my clothes, a study table and somewhere to put a tv and a gaming console, and also a bedside table

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

Thanks for all the detailed comments! A few clarifications from me.. We have done the BASIX and so, really, the window size, shape, location is determined. That wasn't clear of me, sorry, I guess I meant we can change the dimensions (within reason) to suit if a "standard size" is cheaper than the size that we have currently, which was rather arbitrary. But this way of thinking might be totally irrelevant! All the windows/doors penetrations are blocked out when they pour the concrete panels, so while we could infill or something if the penetration is too big, we are really trying to get it right now so there are no breaks in the concrete. I think we also did the BASIX with double glazing and Al frames originally (will look it up) but as we are off grid that kind of blew everything else out of the water. We have done all the shadow diagrams and spent a lot of time with placement and eaves. I think that part is OK. I am pretty set on double glazing and thermally broken frames (where aluminium). Thanks Paul for your comment of 10-15%. Our preliminary quote from out builder is certainly not that high (more like 5%) and I was having trouble seeing how we could get everything for that price. I am sure it is possible, and while we are very conscious not to over-capitalise, I don't think the most basic product is a good idea. oklouise, I share your concerns about bifolds! I don't really like them but my partner really wants them and I'm happy to give on that one. I have one quote from CedarWest which seems reasonable, but then it's the same again for an integrated screen!! Will consider other ways of doing that. So! More details: See attached the overall floor plan (floor plan attached twice, sorry!) and views. Great 270deg views (all but west as sort of dug into a hill to avoid the wind). There are 2 pods connected by an open walkway. Ignore the round window - point of contention and may change. The main pod has two large east-facing windows. A thought was gas-lift windows with the large bottom sill to serve as extra seating when open. In the E view, the verandah will not have that many posts so the view is not actually obstructed. Any ideas are greatly appreciated! I think I am just struggling with all the choice, and need to start pining down some constrains that I can work within! Thank you!!