I have ordered a coal burning stove and need to install a hearth to sit the stove on. I am looking for the building codes and basic installation procedures for a hearth.
Thanks

I take it you don't want to call your local building inspector? He would be the first to check with. After that check with the stove manufactures specifications on clearances to combustibles.
The general rule for a hearth was 18" of non combustibles in front of door. 36" min from combustibles furniture. Conventional stove pipe 18" from ceiling down. Standard crock 8" of solid masonry material around clay crock with a 1" air space. Again these are general rules of thumb. They have tight clearances stoves. So to get it perfect Need to meet the code in your town and if you think thats week check with the fire company and get the info on the NFPA. National Fire Procreation Agency and that is a good resource, which the Township has its guidelines gaged to.
Like to help you more but you MUST follow ALL codes and manufacturing UL specks on the stove. Just on a side note I always add an extra inch on side clearances to cover for My customers insurances. Another thing here Is I used to have the customer call there insurance company to make them aware of the Code installation and does there policy even insure fossil fuel installation in the structure?
I'm one of those contractors I do It By the Book and make sure the homeowner is also protected on fire insurance or if they need a rider for there policy. Not to be a safety Nut but think of smoke directors in your bedrooms and hall ways. The make them now the batteries last for 10 years and get the approved NFPA. Again your city fire department should be good for that along with the inspector.
Now the actual masonry installation for the hearth I can tell you how to lay that up and the mortar mixes and anything in the masonry end and added floor load end. Just need weight of stove and type of masonry material to figure the added floor load. Location of stove Ina a corner middle of wall and is it on slab or wood joist?
I prefer all stove to be a min of 8" off the floor. It presents the stove nice for show and balance and it makes it easier to load. Just on a side note is there a chimney there now of who and what is the chimney made out o?
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Great! I didn't want to be hard on you about the inspection etc but needed to point out everything involved to help everyone their be safe. If you feel that your skill level is good enough to install the actual hearth I can help you with on anymore questions. Or Ideas in designs of looks and layout

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Can't give boat a new great rating just yet, got to spread it around first but he's done a fine job on this. Keep in mind that you can use something like a Hardibacker board for a sub floor and then ceramic, slate, faux stone laid in modified thinset mortar.