It seem like you have western sun on the back of the house due to the blinds in you patio photo. To combat this the new roof could be angled low on the west and high over the house as in a fly over roof. Maybe shade sail over the spa attached to the patio roof and lots of tropical plants. It is hard to guess from the photos but if you link the two areas with decking & add gardens surrounding it for shelter. Do you need a fence around the spa? Others have said that the composite decking is good and it won't rot like timber or at least is low maintenance for a wet area.

Hi Rick, As a spa is a time for R&R it is important for it to feel like a secluded space away from the hustle and bustle of life. I would remove the stick fencing and paint the existing fence in that corner white or whitewash. From here I would add bamboo along the left hand side of the safety fence to increase privacy and the 'retreat' feel, leaving the side with the entrance open. Planting a wide variety of tropical plants will enhance the space further, lots of green but do not be afraid to mix in some purples and pinks here and there. If you are scared of killing the plants, succulents are really hard to kill. Even installing a few simple shelves on the far fence to hold candles and other decorative items will make the space come together. Fairy lights are great for outdoor spaces used at night also, solar powered options are available. You even have the option to include some seating as you have so much space. Again, going white will really lift the space. Some fun hooks on the fence would be awesome for towel/robe storage also.

Hi Margaret, Hope you found a great solution for your spa area! I saw someone mention using natural foliage as a screen and thought I’d chime in to propose using a mix of real and artificial plants. After all, living plants may be seasonal (and fail to offer much privacy when they’re not in full bloom). You can check out our range here - www.evergreenwalls.com.au Richard

i mean the structure of the floor ie a concrete slab on the ground or a timber framed floor with crawl space underneath not the decorative surface of timber or slate or tiles and please post a site plan showing the "extra master in line with pool" with dimensions and distances from boundaries, pool and back of house and how do you use that space and does it include a bathroom? and extending into the front porch may be less cost effective than extending into a new space at the rear but will test some ideas for you but what you are suggesting isn't what i would expect to be able to achieve on a tight budget