A narrow, long space like that can feel like a challenge, but if you figure out how you want to use the space before you start designing you will find a lot more success and fewer headaches. Here are some considerations before you start your plan: How much does privacy matter, and not just from neighbors but privacy from the indoors to the outdoors (considering you glass walls and ceilings you’ll need to think about how the space will work from both the inside and the outside). How do you plan to use the space? More specifically, do you plan to host lots of big parties or are you looking for a quiet place to enjoy your morning coffee? Or both? What is the material of your boundary wall? How can you use the wall to enhance the design and functionality of the space? Could you grow a vining plant up the wall for more greenery, or add narrow planters at the base of the wall for a vegetable garden? Do you want any type of covering for the space, like a pergola, roof, umbrella or other sun covering? Do you want it for the full space or just one area? What is your budget? Depending on your goals and timeline for the project, you might have to adjust the rest of the plan (if you don’t have the budget to make your dream space happen, consider taking the project on in phases and slowly save up to make the next phase happen). In the meantime, we’ve created alist of considerations before you start a landscaping project, as well as ideas for pergolas, andpatio lighting ideas. Here are a few images to get your design wheels turning:

Are you sure that is not meant to be meters.My house is twice this size . As for designing your own house that is really done often but always with some input from an architect to make sure what youwant is doable

Wow that's way too much. How would a polymer alcove come in from the main powder room door ? A comfortable moving space is around the 23-24 inches. It may be too cramped up imagining from what you have described. WC is facing towards the shower area? You may draw up the plan and share it here for better understanding. Nitin Cornerstone Designs.

There is no average height for the table and chairs.There're height standards for all the furniture. The standard height for the table is 30" and for the chair, it is 18". The depth of the table should be atleast 36". It might be a little broad say 42" but not more. The length if the table is defined with the seats required. The chair seat size should be 16" with the back height be 30" atleast. It might be more depending upon the design of the table.