I think you first need to look at your general area and the size and style of homes there. Attend open homes and check what others have done or not done and the price they sell for. Even look at returns on leasing according to the style and condition of the house - Estate Agents will happily help you with this. Depending on movement in the market around you, this can take time, so be patient it will be worth it in the long run. You can be a little adventurous with any upgrades when people are upgrading and renovating all the time, just don't to too far with what you do or how you do it to avoid overcapitalising or limiting your market. I'm also finding a lot of buyers are resisting ultra modern homes, they like modern but not too OTT so beware of adding features that may not appeal to everyone. Again, studying the type of people in your area will give you clues as to the type of people who will want to buy into the area, the type of lifestyle they have and what they want in a home. The trend to putting ceramic tiles in kitchens and casual living areas is fading and they are much more expensive to take out and replace. Definitely not a good idea if you decide to lease as they can be broken or even pit if not cared for properly. I'm presently looking to buy a new home and I'm seeing too many homes where tiles have been destroyed which is going to be a very expensive exercise to replace. If you are going to lease, keep things simple. I think Oklouise has nailed a very simple plan although I would take the toilet from the laundry, some space from both the kitchen and living area and put a separate powder room beside the laundry so you can make it more attractive for guests. One slide-in door from the hall opening to a lobby with the laundry going off one side and the power room the other, would take care of any odours or noise. The washing machine and dryer will make noise too. I don't think I would attempt to create a master suite downstairs, I know many who agree with me on this, but dividing bedrooms over two levels tends to create "fractured" families. You certainly won't want to be running up and down stairs all night to a restless or sick toddler. It then becomes too easy to have the toddler in your room and that can be a very hard habit to break. Three bedrooms are sufficient for many people so a simple upgrading of the bathroom, wardrobes (if necessary), flooring and window covers should be all that is necessary for the upstairs. The emphasis these days seems to be more in living space and entertaining especially when it includes generous outdoor areas , so I would make that your priority.

all always depends on how much you want to spend and what space you need that is not available in the rest of the house but regardless of where the bed is located the entry door must also interfere with the use of the next door sitting room and with so much available space it could be worthwhile to enlarge the ensuite and use the windowed part of the wiw for a study or retreat area and use the small wiw for it's original purpose and add a solar skylight for more daylight ..something like this?

Your request is confusing. Are you knocking down the existing house, and want to build new? Where in Perth? You need to design within the Shire’s building code, for setbacks, pool requirements. It is best to go with a company/architect who work in your shire. The plan you have shown has a lot of wasted space in hallways, due to the structural support needed for the roof. It is best to work from the building external envelop to ensure that you maximise your internal space by minimising internal load bearing walls. Thus you can plan for multi use open planning, especially if you have a restricted block size.

Real estate floorplans always need adjusting to correct dimensions but working with these and some missing dimensions I suggest the following. Moving the kitchen to the old laundry position, using the existing kitchen as laundry/Mudroom in Plan 1 and as ensuite and laundry in Plan 2. The ceilings need to be considered in these old houses so working within existing walls is best. Access for plumbing could be accessed from under the house. Great to see that there is a toilet in the Spa area and adding a shower would be a bonus.