Help required with Extension pls

[SRB1309]

Good Morning,

I am in the process of extending our current separate kitchen and dining into an open kitchen/diner with additional living space for a L Shape sofa and TV while also having a separate bathroom and utility room.

We are at the space planning stage and have come up with a few challenges:
To maximise the space we would like to extend the Rear and Side of our current diner, which from what I have read does not need planning permission as the length of our rear extension is less than 3m and side extension is less than half of the house (as show in the picture).

Firstly is there anyway we could easily extend 'Wall D' (see attached picture) to the length of the proposed rear extension so we have a square like shape without planning permission?
If we do need planning permission, how do we go about getting a design to utilise all our requirements?

Is there anyone you could recommend or know of any companies that can assist with planning with our proposed space structurally as well as assisting us with how to design the whole space in a 2d/3d diagram so we know what it will most likely look like?

• Sorry if the above is brief as this is our first project
  
  Thanks
  
  i45.tinypic.com/wl20w4.jpg

[tricot39]

You probably have asked too many questions in one go. There will be many more questions to come! Ask around locally and find yourself an architect/surveyor/architectural technician to help you negotiate the maze. You can design to avoid planning but you still need to meet building regs requirements. You will also need a spec and drawings to get prices from builders. It might cost a bit.but usually a lot less than the cost of attempting it yourself and making mistakes. Quicker too. Starting now you might get on site by the end of the year - make sure you take care to visualise the space and how to live in it at an early stage to avoid late changes or spaces that dont work well at the end.
Good luck