Better to convert the 3.5 X 2.4 bedroom in to bathroom, your plumbing is next to it. Your study should remain where it is.

I would have to say, it is not, a no no. However, how you decide to do this will determine whether it is positive or negative. If the toilet is in direct view as you enter it is likely to be negative, but the impact can be reduced with a smaller pan and an in-wall cistern. Noise and smell are often factors that will influence the decision. So, the smell can be overcome with an automated odor extraction system and there are also low noise inlet valves available. As far as property value is concerned there is a multitude of scenarios and just as many opinions, so consider how much convenience this will give you and how long you intend to stay in the property? perhaps it may be better enjoy your home the way you would like it to be.

My thoughts. Firstly, as has been said, you'll get better results seeking professional help, especially for such an unusual design. The external surfaces are an expensive part of a build. The larger the external surface area per sqm of footprint, the larger the cost per sqm. Seperate wings & courtyards increase the external surface area greatly. This plan has a very large external surface area, so will be costly per sqm, for what is already a very large dwelling. Separate wings also increases hallways & circulation space, which some people find wasteful, & increase the time to move from one part of the house to another. Instead of a U-shaped house, how about an L-shaped house? This would reduce the external surface area of the build & the amount of hallway space, reducing the cost per sqm & the size of the dwelling. With an L-shaped home most rooms could face the outdoor space in the NE side of the block, but some (possibly the minor bedrooms) would likely face the southern street. So, a couple of questions; Is this a newly developed or established area of Sydney? If it's an establish area with neighbours close by, could you post a screenshot of a Google Maps satellite image, to get an idea of outlooks & whether there will be privacy issues with neighbours? How quiet is the southern street? Are you happy to have rooms facing this street? How much busier is the western street? Is it possible to locate the garage facing the western street, or is it too busy for access? I'd much rather have the garage face a noisy street than the master bedroom (although the ensuite will help a bit). Also the western side of a dwelling is a great place to locate a garage, as it shields the house from the hot afternoon sun. The west is not a good place for bedrooms (although again, the ensuite will help). On that note, have a read of this, paying attention to the section on passive design & orientation. http://yourhome.gov.au/passive-design/orientation As for your current design, your bedroom wings are likely to shade your living areas for much of the day in winter. A skillion roof with north facing clerestory windows, as shown in a few of the pictures in this thread, would help get winter sunshine to your living areas. Although an L-shaped build would allow more northern light to the living areas than the current U-shaped plan. Best of luck with the build.

"Extended Height" toilet suites are exactly that - seats that are higher off the ground to assist people with poor mobility with standing up. My understanding is the seat size is the same size as standard height toilet seats. Unless you are much shorter than average the additional height shouldn't cause discomfort. I would have a look at some of the Australian brands such as Caroma who have lots of older style pans, matched with more contemporary style, dual flush cisterns as a starting point. https://www.caroma.com.au/category-product/toilet-suites Unfortunately toilet suites aren't like shoes that you can try before you buy, but perhaps keep an eye out for toilet suites that do work well for you in the homes of friends and family and take careful note of the ones that you do find that work for your particular requirements. I would avoid any of the asian and european brands as they are sometimes more compact than the Australian brands, and avoid any of the contemporary styled ones that are non-traditional in shape. And don't let your plumber choose your toilet suite, as they are not all the same! Best of luck, Dr Retro of Dr Retro House Calls