Thanks for all the great ideas everyone and sorry I didn't explain the polycarbonate a bit better :) This is along the lines of what we'll be using... http://www.psp.co.nz/building-brands/corrugated-sheeting/suntuf-polycarbonate The area is an absolute sun trap and we're hoping to use it as an extension to our living space, especially on rainy days! I've just sent my husband out to get a few pots of different stains for is to try - darkest brown (cedar) and a lighter brown (rustic oak) both by Cabots + the black we already have. Hopefully we can decide between one of those! I probably should have mentioned we will have black aluminium pool fencing running along the top of the second retaining wall - so the real question is do we keep everything black (pool fencing, horizontal fence, retaining walls and pergola) or do we go with a dark (or even light) brown for the pergola and retaining walls.... We just keep going around in circles at the moment. Decisions, decisions! Thanks again :)

Sorry I am so late coming to your site - you are an inspiration to all, homeowners and advisers alike. For your planting advice, I suggest you call Merrifield Garden Center to see if they will come out your way. They currently have wonderful garden centers in Merrifield and Fairfax (both in Fairfax County) and a new one in Gainesville, but they may come further south to wherever you reside. (www.MerrifieldGardenCenter.com) Even if they don't send designers to your area, they are worth a trip to see their huge selection for a day of pleasure and inspiration, or to pick up some plants. Most of my clients are in the Fairfax and greater Washington area, but I am currently living out west below Front Royal, VA on the Shenandoah mountainside - wonderful views. cascio.offsite@gmail.com

An outdoor room is like any other room. First decide what you want to use it for. For example, my back yard has a couple of rooms. The "dining room" is a table and 4 chairs under an inexpensive ($150) 12 ' X 12' Home Depot gazebo . The gazebo gives a pleasant feeling of enclosure and privacy when we sit at the table, and it also keeps the table clean and dry. We have a big hydrangea shrub right at the edge of this area to mark its edge. It's pleasant to sit so close to something blooming. The "living room" is 2 comfortable chairs and a love seat around a coffee table. We entertain there and pull the dining room chairs over if there are more than 4 of us. We also sit there to read in the evening. There's a smallish tree right beside it so it's pleasantly shady. The "kitchen" is the grill and a small table to set things on, and is closest to the kitchen door. Once you have decided how you want to use the space, you'll need to decide whether you want a new "floor". We have a low L-shaped deck that has the three rooms. Or you may decide on a concrete or slab patio for all or part of it. Farther from the house is some grass, and then more big shrubs (evergreen and blooming - little maintenance). And a little raspberry patch because it's fun to eat them right from the bush. The landscaping really comes last, once you have decided on the functions of the area. Don't start planting without a room plan. You may want, for example, to put one of your rooms right against the fence or wall, and if you've already planted shrubs or made beds then they will be in the way. You want to plant trees and larger shrubs so they are useful as the walls and roof of your rooms. Be sure to check the mature size of your plantings (it's on the tags) so you don't end up with branches hanging over your roof or over your neighbor's property. Don't make the mistake of putting in so many beds or plantings that you don't have time to sit and enjoy. A few low-maintenance shrubs that are planted close to where you sit are just as enjoyable as big swaths of flower beds that need weeding, annual bedding plants and maintenance (unless gardening is a hobby that you enjoy spending time at.) Enjoy your new home!

It looks great ! As the house is lighter and darker greys , I'd add a white gloss painted 'rail' around the top -- hard to tell appropriate sizes from the photos , but probably pine 150-200mm wide and 60mm tall . Easiest would be to simply nail it to the posts and top rails , but if you added some spacers ( cut some 100 x 50 pine into 100mm lengths , then stain them the same dark grey fence colour , nail to the posts and probably every 'halfway' too , it would really 'lift' it more ? IMO that would really tie it all in with the house , and look classy , for maybe $2k tops .