A pergola will obstruct light into the structure. What is the structure used for? How do you plan to use the deck for? Eating? Sitting? etc? Plan the activities and the furniture you'll need and draw up a floor plan. Floor plans are important outside & inside. The steps to the deck from the lawn are a little too abrupt. Needs a transition. Consider adding cement pavers to the grass, not as an extra patio but for a nicer transition design.

And I would be planting trees – real trees not dwarf versions of trees and no more palms (unless you want to have palm tree themed garden – in which case a lot more palms are needed). I am not advocating planting forest giants but there are trees that will provide shade, shelter and a sense of scale that you won't get from yuccas and buxus and mondo grass and succulents alone. But before you start buying those trees you have a few decisions to make and a bit of analysis to do. 1. Orientation – you need to understand the basics of winter sun and summer sun, how much westerly sun you welcome and how much you need to shelter from it; where your prevailing winds blow from and whether this changes with the season also. So, once you've worked out where you want the sun to penetrate and at what time of the year, how to allow for wind, frost, whatever... you need to 2. Decide if you want a predominantly native garden, a range of deciduous trees or a completely eclectic selection (like the best 'English' gardens – which are planted out with plants from all over the world – Indian subcontinent, Asia, Africa, The Americas etc. Even some from Australia!). 3. Now the tricky bit – what do you love, i.e. which trees and plants make your heart really sing – and hopefully for more than two or three weeks of the year? Once you have that list which of those are likely to be happy in your climate, in your soil and with the amount of gardening attention (watering, feeding, pruning etc) that you're likely to enjoy lavishing on them. Your long list will by now be a much shorter (and more manageable list) but trees are what make a house look bedded in and part of a landscape rather than just sitting out in the open in a way that is both self-conscious and a bit awkward. Although, again I guess you could embrace the suburban awkwardness and go all Howard Arkley in which case keep it all small and suburban... But it is your garden and your house – make it look like what you want your house and garden to look and feel like! Good luck!

Thanks Susan. I would love to get feedback here from the Houzz community on butterfly roof construction. I know that flashing the valley will be critical to say the least. Whoever does the roof has to have 1. Skill 3. Architectural specs to follow 2. Guaranteed work. How do they hold up in a climate such as yours which is sub-tropical? It's a big project so you will need to be confident in the outcome. [https://www.houzz.com/discussions/can-you-please-tell-me-how-the-water-drains-from-the-valley-of-this-butterfly-roof-dsvw-vd~423763?n=2[(https://www.houzz.com/discussions/can-you-please-tell-me-how-the-water-drains-from-the-valley-of-this-butterfly-roof-dsvw-vd~423763?n=2) And here is a box gutter diagram to check out. I would research the heck out of construction techniques so as to be as informed as possible so that you are able to have a better dialog with the roofer when the time comes http://www.builderbill-diy-help.com/box-gutter.html

Hi Marianna, I recommend you to ask for a quote from at least one contractor, to have a more accurate cost estimate. Regards!