How high should a run be?

Totally new to this and my house arrived today so we will be building that at the weekend but I'm planning on getting my husband to build an extension to it as I don't think it is big enough.  I want to have a hinged roof so i can clean it and they will be out in the garden if I'm there.  My husband doesn't want something that makes the garden look a mess but I obviously want to protect from foxes etc. and i want them to have enough space.

So would 75cm be high enough for the extension part of the run?  And should it all be covered.  I am planning to put chippings down in the run near the house but I am thinking of leaving the other part as soil or will that just turn into a mess unless covered?

If I can pursuade him to make it large enough the run will have brick walls on three sides and the open side will face due south.

Any suggestions?

Your new run looks great.  Lovely design on the door.  It is going to be under my kitchen window so can't be as high as that as it will have to stay below the window cills.  If I have a covered roof I would have problems hinging it open and keeping it water tight at the wall.

I was hoping to fasten it securely to the walls as the space is about 6 m wide and I did think that would save having to build 3 of the sides I would only need one long side and a roof.  Not sure if my husband will agree to the run being that size but it's my birthday soon so i'll claim a hugh run as my present. 

Once the flower bed is cleared and the house up it will be easier to see what we can do.

Don't restrict height because of the kitchen window, take the roof above it, what better than a view directly into the chook run?

A walk in run would be better if you can manage it.  So much easier to clean, spaceous and airy.  I love going in and sitting with the girls, I'd feel very out of things if I had to sit outside and watch them.  Having said that, mine can't free range, so I don't get to enjoy them loose in the garden.

My set up was a birthday present last year, including the girls, and it's the best birthday present I've ever, or will ever have.

My run is down at the bottom of the garden built on to an outbuilding, so neat but rustic.  Smilers is just perfect, and exactly the sort of finish I'd go for if it was closer to the house.

Since this picture was taken, we've added an opaque roof, because it was just horrible and muddy.  Now the girls are fluffy and dry at all times, and I can go and sit in there with them come rain, hail or snow

i would say build the extensoin large enough so u can walk in there you'll never know when you will need to do that ,also its slighty more better protection agaisnt the fox geting on top . mine run is 7 foot high and i would never have anything lower then that .

Thanks for the lovely comments.  I'm well chuffed with it and he's not really made stuff like it before.  Also we now have guttering on the front. 
Most of it was scrap wood that he got from work, scaffold boards are at the bottom.  We had to buy the wire, roof and guttering.  I love being in there with them. 

It's well worth going as high as you can makes life a lot easier.

smashing runs...maybe we ought to have a sticky featuring some of these fantastic examples!!

75cm is ok if thats wot you want just as long as it does everything that you need it to do and easy for you to clean and stuff, nice coop iswell you must have happy chickens