Enchantment bonus pricing.

[ghostofafrog]

Do the enchantment bonues stack for purposes of pricing.
That is, when something is already +1, can you give it a +1 enchantment at the +1 price, or is it at the +2 price?
For example a returning sword.

+1 Longsword is 2000, and the returning is another 2000, right?

Or does it function as a +2, being 8000?

[Mucronis]

it stacks, it functions as a +2.

If you add new abilities or increase the enhancement bonus, you total up the combined "value" of the enchantment bonuses and that would be the new price, minus the old price before re enchanting. Or in other words, the price difference from the old to the new is what it would cost to get it re enchanted (note that you can not remove enhancement or abilities to use as "payment" to add better, more expensive abilities, baring GM fiat ofc.)

Adding New Abilities:

Sometimes, lack of funds or time make it impossible for a magic item crafter to create the desired item from scratch. Fortunately, it is possible to enhance or build upon an existing magic item. Only time, gold, and the various prerequisites required of the new ability to be added to the magic item restrict the type of additional powers one can place.

The cost to add additional abilities to an item is the same as if the item was not magical, less the value of the original item. Thus, a +1 longsword can be made into a +2 vorpal longsword, with the cost to create it being equal to that of a +2 vorpal sword minus the cost of a +1 longsword.

If the item is one that occupies a specific place on a character's body, the cost of adding any additional ability to that item increases by 50%. For example, if a character adds the power to confer invisibility to her ring of protection +2, the cost of adding this ability is the same as for creating a ring of invisibility multiplied by 1.5.

Crafting Magical items.

[ghostofafrog]

So specifically in my case, a +1 returning Warhammer would be 8000, right? and if i wanted to add throwing onto it, it'd bump it up to a level 3?

[Mucronis]

Yes.
Well, 8000 gold for the Magic, + 12 gold for the Warhammer itself + 300 gold for Masterwork quality (all weapons and armor needs to be made as a masterwork item to be able to be enchanted) so 8312 in total.

[LazarX]

It doesn't matter how you get to +2 or +3 or whatever plus in what order. it's the final total plus that determines the price.

[VRMH]

Enhancement, unless you're trying to mess up minds with your warhammer instead of bashing brains.