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They did not change from shell keep castles to square keep castle, they existed at the same time.
Most shell keeps were a result of replacing the wooden towers on top of the man made Mottes (erected as a quick way of making a castle) with stone buildings, as they were man made it was often thought they would not take the weight of keep with very tall thick walls like the Tower of London so they made shell keeps, with thinner walls.
To build a substantial keep they would have to demolish the Motte. You would have thicker stronger walls with a square tower, but the extra height on top of the motte is also a defensive advantage, and it woule be cheaper.
If you're referring to the shape, it's a matter of culture. Different cultures have different architectural styles. If you're referring to why they stopped being built, it's because cannonballs were invented, making thick stone walls no longer an advantage.
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When did they stop building motte and bailey castles?
1981
Why did they stop building concentric castles?
Because the cannon was invented therefore blew castles up :)
When did king William stop building castles?
Because he had built strong secure castles and he had enough of them around the contry and he was happy with their design which was a pointed tower castle.
Why did the Normans stop building castles?
because they where to old and there was no longer any materials to build them hope this helps
When did castles stop being effective in warfare?
Because Chuck Norris Started in the movie business
When did they stop building castles?
Castle building stopped when they were no longer able to be defended. In the 15 century, artillery such as cannon balls and mortar were able to break through the stone walls.
When did square keep castles stop being built?
Dont have a Clue LOOK SOMEWHERE ELSE !!!!!
Why did they stop building Japanese castles?
In addition to losing their effectiveness as defensive structures with advances in technology, as civil strife within the country declined, so did the necessity of such structures.
Why did people stop living in castles?
because they thought that if they lived in castles they would get eaten by the dragon ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
When did people stop building castles?
castle buliding came to an ending because of the gunpowder becoming a weapon and stone can not defeat gunpowder so alternate mean of defeat were sought
Why was it good to keep prisoners in castles?
it was good because they could be guarded non- stop. so no prisinors could get out and they could only get in when a security guard put them in
Why After 1500 did castle buildings stop?
The introduction of gunpowder made castles inefficient.
