I would love a sun room off of the kitchen.

A large entertaining area that leads outside (I live in an apartment so this is the dream).

A library for me, with real books. Wall to wall mahogany shelves and a rolling ladder to reach the high ones. Let's put a desk and chair in there, and a chaise to recline and relax on while I read, and I'll be all set. Oh, mustn't forget floor to ceiling windows to gaze out at flowering trees while I ponder a thought from my book or take a nap.

It's structurally not possible for my house, but I would love an old fashioned attic or basement - a place for indoor storage so "stuff" could be stored out of sight and not mildew.

An outdoor room, screened, with fireplace, great comfy furniture...love this hanging sofa swing...friend had one...it was great!

Wine cellar :-)

A main floor laundry room and a man cave for hubby.

a road surrounding with flower containers and chairs.

A larger garage, so both cars will fit alongside our motorcycles.

A bigger outdoor space!

I would like to add an exercise room complete with sauna;)

I love Bumblebee's idea since I'm a huge devourer of books!

A nice study/retreat would be delightful

I'm with @julieellen and @Margo! Wine cellar and a gym

i'm with jayapple21 -- more storage, particularly an attic i could get into!

Mud room!

A "decent" sized mudroom. For a large house, the mudroom is 8 x 5 and it contains a washer - dryer and three doors that open into it. Poor design.

Brew room!

I'd like a steam room:)

A sun room. In the winter time can be used to get some solar energy (probaly go with a hydronic system) and a greenhouse to start seedlings

Well-equipped roof terrace.

J Design Group, Modern Interior Design Firm in Miami, Florida. http://www.JDesignGroup.com

For resale, we could use a master bathroom. For our family's actual needs, we'd love a mudroom. But in a historic house with no room to expand, we aren't going to get either.

I'm torn between wanting a room to store all my craft items for knitting, beading and papercraft and wanting a large conservatory to sit in, drinking coffee and reading.

A room for kids to socialise in while we adults hang out in the main lounge.

A parent's retreat is an absolute must with a family of 3 generations....to separate hubs and myself from ..grandmama , man-child and a tween.. ;-))

I would loooovvvveee as studio where I could work. Somewhere that I can create ....and if I make a mess...that is fine...I can close the door if I haven't finished or...tidy up when I am. I don't have to rush and put everything away because you are going to have a visitor...I like my home to be neat and tidy but...sometimes it is a pain to have to put things away especially when you are in the middle of something.

You can have an extra room and call it whatever you like and a utility room is a good one as it is utilized for everything...so it is not just one room as such...bedroom for visitors, ironing room, study, play room... I think utility room covers it...but Studio...that is another story...lol you know that is the creative area. It also lets you be more creative I think with more space to work.....

Sometimes we don't need an extra room but we need to use what we have a little better or rather than an extra room...make the ones we have bigger when we build in the first place.

So agree with you Wild infusion so want my mess room that is MINE . I have a carport so I can't even work in there, store my precious junk BUT there is a area beside the carport and the back fence which in time I will use that space by building two rooms one to store my dad's tool he gave me before he passed away. The other to be my mess room small but somewhere my brushes and junk can be in peace. No phone nor front door bell to be heard.

basement!!

A butlers pantry where I would have a bench for all my kitchen gadgets, and shelves for all my bakeware. I would also like to have a larger closet for my clothes which are currently spread over closets in the other bedrooms

Rather the butler myself.....

I'd like an old fashioned cellar for storing bro dice from the garden preserves etc

That would be produce from the garden

Definitely an gym/dance studio

I live in a small townhouse and a rooftop terrace would be fantastic. Somewhere to relax, soak up the sun and grow an edible garden.

I'm taking my bed out of my double bedroom to change into a library, otherwise I would say library. But, for me, it's down to basics: I need a kitchen and laundry! My house was a holiday cottage and to call the kitchen corner a kitchen is a far cry from the reality. I can't even stretch my arms out yet I have to cram my washing machine in there, too. Help!

I would love a larger kitchen. Ours is tiny!

Library.

A shed!

I have three, I could lend you one, ( joking).

A totally sound proof padded room with the lock inside!!! Sorry child hasn't stopped talking all weekend.

Lol.

Either a gym or a larger home office with external access!