This is how I play the song. Suggestions and corrections welcome!
G   C x2
G
I wanna build a house with you
A house with you
A house with you
   C
A home
So we can be alone
     G
And I've been running
I've been hiding
I've been falling down
              C
And climbing back up
Where they think they belong
Oh let's go
G G C Am x2
Bb     C
And I know
           Bb              
That you wouldn't try to tell me
          C     D  Eb
What you don't-       Oh!
A / Bb  Dm  Gm  Eb / A
A / Bb  Dm  Gm  Eb 
Bb               Dm
I wanna build a house with you
   Gm
A house with you
   Eb
A house with you
Bb               Dm
I wanna build a house with you
   Gm               Eb
So we can be alone
               Bb   D    Eb
So we can be alone-ohohohoh
Bb
Alone
D
Alone
Eb
Alone oh oh ah oh
Bb D Eb
Ooh, oohooh...  x4
G   C x2
G
I've been slipping on my shoes
My tongue is swole
My lips are bruised
    C
And I can't get up the hill
G
And I've been jumping through some leaves
And chopping down some cherry trees
   C
So I- oh, so I can tell
So I can tell the truth
G G C Am x2
Bb     C
And I know
           Bb
You up to ears and eyes
                        C    D  Eb
With a killer at your throat
Bb               Dm
I wanna build a house with you
   Gm
A house with you
   Eb
A house with you 
Bb               Dm
I wanna build a house with you
   Gm               Eb
So we can be alone
               Bb   D    Eb
So we can be alone-ohohohoh
Bb
Alone
D
Alone
Eb
Alone oh oh ah oh
    Bb           D       Eb
Alo-ooh-ne, alo-ooh-ne, alone
    Bb           D       Eb
Alo-ooh-ne, alo-ooh-ne, alone
Bb D Eb
Ooh, oohooh...  x4
A A A / Bb Bb