can you post a copy of the floor plan for the whole house

lots of questions: first explain your limitations, is this an existing building? are the external walls fixed, what restrictions are there to internal walls, windows doors and plumbing, what are the walls and floor made out of, who will use the space, is it for a rental, family member and/or a person with physical limitations, what parts of the original house if any could be included, is there a separate garden, entry path, car space, describe the climate and the position of the granny flat relative to the main house and garden and where is north

Thanks for the comments so far.

Please see the original floor plan here: http://prntscr.com/iw1utc (red outline shows the building that I want to convert to the attached granny flat)

North is directly at the top of this picture: http://prntscr.com/ivo7vq

The material is brick veneer.

There is 3 windows already present in the structure I wish to convert, in the plans above, I have already converted one window to a 1600mm wide sliding door for external access... as the external door present in the current plans is too close to the existing house which will make it hard to give complete privacy.

It is going to be used as a rental in the short term, and long term (5-10 years, to move back into the main dwelling, and allow parents to move into granny flat).

P.S - the reason why I put all the services on the back wall was because the sewer is in the back left hand side of the property so I was recommended to keep it as close to the back door as possible to keep costs down.

i agree that the toilet is best near an existing sewer line but my suggestion is much simpler and allows much more space with functions grouped eg a small front loading washing machine in the bathroom with a generous sink and proper underbench wm plumbing and there's no need for a laundry tub, a bench in the kitchen has space for two stools with a view, there's a whole wall of storage, queen sized bed and a walkway around both sides of the bed

Wow @iklouise, I appreciate the time you've put in to putting that together.

I like the simplicity of that design. I guess my concern would be (being a rental) is the issue that there is no room for a "tv", I note that you've included one in the bedroom and also one near the fridge.. however, the view from the "lounge" is not quiet there in my opinion. Just a note, my household right now does not even have a TV, so I am totally guessing when I say that would not be acceptable to most people to not have a proper entertainment unit?

I have come up with two more designs: http://prntscr.com/iw4dn5 (note: I have moved the rear entry to the back wall, instead of the side).

Here is another design, I'll probably end up moving the cooktop to next to the sink though due to the tv and cooktop being near each other is probably not a good idea: http://prntscr.com/iw4eg5

you have too many doors and hallways, think in terms of a motel room rather than a small house as your plans lose all the storage for a tv that would be quite happy on a wall...this style of granny flat needs to include all furniture and appliances as everything has to be sized and positioned to suit the space, i don't understand the privacy issue, a solid hinged front door and proper insulation should be enough for soundproofing, there's also space in my design for bookshelves above the study desk, bed and lounge and a proper queen sized bed with walking space all around will be more suitable for a young working couple... the original plan show that the front entry porch is 2m wide but the space looks less on your plans...you must make accurate manual measurements with current position of all doors and windows (including height above the floor) as there appears to be some discrepancies...There are also many alternatives to consider eg a mini cooktop plus a combination microwave convection oven, a smaller fridge, a front loading washing machine under a counter with the bathroom sink...lots of options but your plans need to be much simpler

simply put - massively pushing the functional envelope in such tight/small limits. To achieve this you have to seriously limit/streamline flow/access points and maximise any wall space. So for example the only window into the kitchen really should be say a splashback window. The double access into the kitchen/living is a luxury in context - something has to give here otherwise you'll end up with something that ticks boxes but in reality is not actually very usable .......recommend you check out some Japanese & northern European work to see how this type of thing can be achieved effectively/cleverly when space is limited....possibly here you may be best to consider a living/kitchen/bedroom setup that is functionally zoned/separated with strategic furniture/joinery placement, simple kitchen at one end and bathroom the only "room" created within existing structure.......remember, depending upon existing conditions and what the ultimately outcome it can sometimes be false economy rearranging/re-using elements when you'll get a better bang for buck by popping out a little here and there to free up certain details for certain functional gains......good luck! PD

Paul has hit the nail on the head. When working with such small areas you really need to think differently. Remember that the smaller the project the higher the SQM rate can be. By combining elements within the build you can circumvent these costs