you can do internal bathrooms if you have highlight windows to give you light..though no views..we have a terrace so no windows on the sides ..our bathroom is internal..due to different rooflines we could still make it work with highlight windows..

by blocking up that deck (court yard) you've eliminated your light source into the kitchen, bedroom 2 and master bedroom. The bedrooms are fine if they've got windows on the other wall...the kitchen is what I'm worried about..your plans shows library then kitchen enclosed..I'd hate a dark kitchen ..

An existing floor plan and the roof plan would be necessary to provide any useful comments. MB is on the money; get the designer in first, that's what they do!

Hi Kerry, are you able to put up a plan showing the existing home with some approximate dimensions?

Yes, hard to tell without dimensions. My comment is that by having a passage on the exterior wall you are sacrificing light to several of the rooms. What about reversing the library/kitchen placement and extend the internal passage at right angles between bathroom and ensuite to connect the new bedroom. = light in the kitchen and the butlers pantry with no extra use of space.

As others have said, a dimensioned plan of the existing house would be really useful, as would some photos of each side of the exterior. Your plan looks really odd, and doesn't seem as if it would work at all well but we need dimensions to really know. Also, am I right in assuming that your front deck overlooks the street, and the back deck currently leads to a private back garden? If so, will you be losing that easy access from the living areas to the back garden via the existing back deck?

If you kept this layout the same then you would need a door from the back deck to the passageway so you can have access to the yard from laundry/living areas.

But I really like Nancy's idea of reversing the kitchen/library then running the passageway up the middle of the bathroom/laundry, accessing the guest room then continuing to the back porch. All rooms get light +easy access that way! =)

bathrooms need ventilation for steam and odours has that been factored in?? I would suggest you go through a typical day in your mind with this floor plan and see what you feel about its flow sometimes issues arise that allow you to change plans for a more effective life and movement style all the best I am doing this at the moment as well

visiting lots of display homes a good idea too to help with dimensions of rooms vs numbers on paper i found it extremely useful

Without a scaled plan I have tips only. I agree with putting the hallway up the middle so that you make the most of the sunlight and not a rabbit warren. I think it is important to have a sunny kitchen (puts you in a good mood first thing in the morning). Use skylights if you can afford, they can really make a room. Try not to have a long skinny lounge room as it is way too hard to place your furniture, especially if watching TV is important. I also dont think a laundry and butlers pantry should be in the same room IF you plan on storing food in there too. The moisture / humidity from the laundry can destroy your food. Food for thought! :)

I agree with most of the previous comments.. Rooflines can be tricky when adding this type of addition. You want the roof to look like it's always been that way - not like an add-on. If it is a traditioanl pitched roof you may find you will need to alter parts of the roof even where you aren't changing the floor plan. This is where getting some early design advice is essential and having an accurate existing floor plan will help.