It was asked before, but no one answered.

If I remember right, the growth is linear. So, if you know the cost from level 0 to level 1, and we know that 5 to 6 is 16800 stone blocks, it should be easy to find out what the intermediate prices are.

A friend had these values and has kindly agreed to share them:

Please note that these are cumulative values, so for level 5 you need 800 + 2400 + 4800 + 8000 + 12000 = 28000 stone blocks.

Crowbar said:

It was asked before, but no one answered.

If I remember right, the growth is linear. So, if you know the cost from level 0 to level 1, and we know that 5 to 6 is 16800 stone blocks, it should be easy to find out what the intermediate prices are.

I am a bit lost. Over in Golden, the BH I was in died. I started a new BH, a sort of safe haven from Main and the antics in there. I bought the bastion, placed it and it popped up as a level 5. Since we are so noobish, I don't want any units put in the bastion for obvious reasons.

Az, that's the right way to do it. I even wrote in that other topic that rubying your Bastion up to level 5 while under protection is the best approach.

But some BHs build their Bastions and then they don't upgrade them to level 5 before the protection wears off, so their Bastions get hit by bigger BHs for cheap points, and are dropped to level 0.

Clancy asked about the number of stone blocks needed, so I made an effort to get him that info, regardless of what I think about the approach.

I am assuming that - once they have enough stone blocks - they'll quickly upgrade their Bastion with those blocks, but by boosting the upgrades, so they're done in minutes, before anyone manages to attack. If they're at level 0, this sounds like a reasonable approach.

Az. said:

I am a bit lost. Over in Golden, the BH I was in died. I started a new BH, a sort of safe haven from Main and the antics in there. I bought the bastion, placed it and it popped up as a level 5. Since we are so noobish, I don't want any units put in the bastion for obvious reasons.

What am I missing here?

if you mean it spawned as a safe level 5 bastion.. then that is different than what Crowbar thought you meant

sounds like a golden coast thing..  and pretty cool too .. sounds peaceful over there.
what your missing is the difference between servers.. which means you are missing nothing

the building cost of leveling the bastion is hybrid growth.
linear is exact same growth each time..
exponential keeps growing at  constant percentage 
logarithmic growth starts out fast and slows down

it varies along the way defying description.. until becoming  linear from level 14 to 20.
sorry for being a bore.. but math is fun

 that chart is spot on many thanks to Cap Crowbar's friend

Killer said:

if you mean it spawned as a safe level 5 bastion.. then that is different than what Crowbar thought you meant

I play on s2 (Golden Coast). Our Bastions spawn at level 3, as they do on other maps.

There are significant differences between FB and portal, but much fewer of them between portal's maps. I can think only of shipmates and the ability to buy 50% off/def bonus.

Killer said:

that chart is spot on many thanks to Cap Crowbar's friend

Only to my friend, but not to me? 

Killer said:

if you mean it spawned as a safe level 5 bastion.. then that is different than what Crowbar thought you meant

Only to my friend, but not to me?