You're doing a few things wrong in the build.
House is supposed to be chill and smooth. You're build is way too sudden and it should be longer (like 4 bars, maybe even 8).
You should use more reverb in the build too. You just make the reverb go up as the build plays and right before the climax, you make it go down. You should use more "woosh" sounds too. (Which is basicly a white noize with a cutoff sweep and a lot of reverb on it.)
I downloaded the file and opened it up in FL to see what I could do with the build and I thought that maybe, you'd be interested in hearing the result.
The part after the climax is pretty brilliant though.
It has a lot of potential but please use more reverb :D. Maybe you could change the tempo from 138 bpm to something like 125 bpm. I don't know, it's just a bit fast for my taste.
Here's my take on the build
http://www.hiveworkshop.com/forums/pastebin.php?id=bx26ue
The build was taken from your track, I just made it longer and put reverb on it.