Hello Davie563,
I have completed this tutorial, and i must say wait till you get to the windows! you'll know what i mean when you get there.
As for you problem, the top polygon looks to be inverted and must be flipped (f key) go back a step and make sure the polygon is facing the right way (the yellow line in the center of the selected polygon should be facing out not in like it is in the picture) and try again.
This should solve the problem. Hope this helps.
OzWOlf
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