The rules state that barding costs two or for times (depending on the size of the mount) as much as the corresponding humanoid armour.
Does this multiplicator extend to the cost of enchantment?
As far as I know, it does not, nor do I see any logical reason why it should. Armor is armor, and costs the same amount to enchant whether the armor in question is the size of a thimble for a diminuitive fey or the size of the Chrysler Building for a Great Red Wyrm. ^_^
The rules state that barding costs two or for times (depending on the size of the mount) as much as the corresponding humanoid armour.
Does this multiplicator extend to the cost of enchantment?
I strongly believe no. Armor for a velociraptor isn't any harder to enchant, its just harder to make.
For raw support
Armor, shields, weapons, and items with value independent of their magically enhanced properties add their item cost to the market price.
So you simply add the value of masterwork tiger armor or whatever to the cost of a +2 enhancement and get +2 studded leather armor fit for a tiger
I'm slightly less sure about the masterwork armor component being doubled or not.
A masterwork suit of armor or shield costs an extra 150 gp over and above the normal cost for that type of armor or shield.
That sounds to me like large masterwork plate mail or masterwork Horse plate mail is still only 150 more than regular old plate mail.
I strongly believe no. Armor for a velociraptor isn't any harder to enchant, its just harder to make.
For raw support
Armor, shields, weapons, and items with value independent of their magically enhanced properties add their item cost to the market price.
So you simply add the value of masterwork tiger armor or whatever to the cost of a +2 enhancement and get +2 studded leather armor fit for a tiger
I'm slightly less sure about the masterwork armor component being doubled or not.
A masterwork suit of armor or shield costs an extra 150 gp over and above the normal cost for that type of armor or shield.
That sounds to me like large masterwork plate mail or masterwork Horse plate mail is still only 150 more than regular old plate mail.
Thanks for the input!
What about the cost for mithral / adamantit etc.?
I'm slightly less sure about the masterwork armor component being doubled or not.
A masterwork suit of armor or shield costs an extra 150 gp over and above the normal cost for that type of armor or shield.
That sounds to me like large masterwork plate mail or masterwork Horse plate mail is still only 150 more than regular old plate mail.
Good catch on the Masterwork question - I concur with this reasoning. The multiplier should apply to the cost of the base armor to determine an adjusted "normal" cost for barding in the style of the selected base armor, then the masterwork modifier should be added to the normal cost of the barding. And then it can be enchanted, of course, at the usual rates for enchanting armor.
As far as non-standard materials go, I think that the same reasoning applies as with Masterwork costing - note that the special materials section does not indicate any modifiers for the size of the armor to be made. (So to make a suit of full plate out of adamantine, for example, you would add 15,000 gp to the normal cost of the full plate, regardless of whether the full plate was Medium sized, Large sized, barding, or whatnot.) Also note, for a number of special materials like Mithril and Adamantine, the use of such materials renders the finished product masterwork, the cost for which is subsumed in the pricing adjustments given. (I admit, it does seem strange to me that a Tiny suit of adamantine full plate costs exactly the same amount extra for the adamantine as a Huge suit of adamantine full plate, but as far as I can tell, that's the RAW.)