There actually no chords I just put in what sounded good to me.

INTRO

Bm

VERSE 1

Bm
The day I knew you?d not come back
Am                              Bm
I built this castle out of glass

CHORUS

But I could never understand
                         Am
Where the windows and walls began and end
Bm
No, I could never understand
                         Am
Where the windows and walls began and end

Am and Bm over long solo

VERSE 2

Bm                          
I built this colonnade of sand
                        Am
Stretched out like fingers from my hand

CHORUS

              Bm
But with the waves coming in
                 Am
In the morning I had to build again
              Bm
But with the waves coming in
                 Am
In the morning I had to build again

Am and Bm over long outro