Dog room must haves.

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I am looking to add a dog room to my house next year. We currently have 4 dogs, three are 60-80 pounds and the boss who is less than 10 pounds.

Where we live it is either muddy 3-4 months of the year or dusty. From May through September or October the dogs swim every evening after dinner.

The youngest two large dogs are crate trained and choose to go in the same crate. They are only crated when we are not home. They sleep with us at night.

At this point I think I need the following, but know I will have missed something:

Heated floors. The floors will be concrete or tiled.

Tub and plumbing for baths.

Exterior door.

Room for crates and beds or chairs, they love armchairs.

Feeding station.

Has anyone created a dog room? What are your must haves?