have a bomb dropped on it

[Stonewell]

Is it possible to say," The house looks as if it had a bomb dropped on it. meaning "as if a bomb had dropped on it"?

 

[modulus]

I'd say it is possible, but I prefer your second version with a modification: as if a bomb had been dropped on it.

 

[Franco-filly]

It should be "..looks as it has had a bomb dropped on it." but "as if a bomb has been dropped on it" is the more usual phrase.

 

[modulus]

It should be "..looks as it has had a bomb dropped on it." but "as if a bomb has been dropped on it" is the more usual phrase.

I wouldn't make those changes without knowing more about the context. That could be a difference between American and British English. Let me explain.

it looks as if it has been bombed = it was bombed recently. That is the focus of the statement.
it looks as if it had been bombed = This is generic. This makes a statement only about the condition of the house without calling attention to when it was bombed.