Thank you everyone for your comments. We live outside Christchurch, and the house was badly damaged in the quakes here. The post-quake rebuild process could safely be described as slightly chaotic, and the house company I am using are located some distance away (like on the North Island), which is why discussion with the architect has been - em - less than optimal. The architect threw something at me to get me out of my comfort zone I think and this is what's freaking me out! I think the windows on the east side are to come (no reason for them not being there), and probably a skylight in the kitchen roof. The section of land is narrow and steep, (this is a historic port town and with access from the south (where the view is); there is no parking other than on the street (south). Patricia - the laundry doesn't sit right with me either! Looks a bit like it's been glued on the side of the hosue. And it is too small as it is to store coats, shoes etc. This is the access to the back garden - thus the door (also means muddy boots can be dumped when we come in!). Entering a house through a living room is very common over here, especially where space is at a premium (small section, small house footprint).

In order to suggest specific plants, I need to know what part of the country you live in. There are no shade trees it seems. I would take down the two shrubs at the front of the walk, including the purple one. Sorry. You can get the purple back elsewhere. They are overbearing and there's no symmetry. At the right corner of your home, not too close where the roots will damage the foundation or branches at maturity will touch the house, place a medium sized ornamental tree. At front, left corner, behind the mailbox ( you need a bigger, more updated one), maybe 5 feet to the right, place another tree. Pull out all the plants that are along the house and replace with evergreens, box woods? Just depends where you live. I would also pull out the white ground cover near the wall, just on the right, in order to achieve symmetry. I would paint the cream stucco a shade of gray darker than your roof and keep the trim white. Also, a new handrail would help freshen up the entry.

Black roof, black window frames and muntins, cream siding, cream (the same tone as the brick siding) garage doors and high gloss black front door. No other color but cream and black. http://www.houzz.com/photos/3245164/Atherton-Residence-contemporary-exterior-san-francisco

I really don't see an issue with the rooflines. Looks like the angles are fairly similar and the clean lines of both structures should be easy to coordinate, especially in your open, rural setting. Since you've found a stunning deal, I would say, go for it! I definitely would want to find an architect ASAP and by all means, before you pour the slab, make sure you have a plan to coordinate.