Difference between closing on a house at the end of the month verses at the beginning or middle?

What is the difference between closing on a house at the end of the month verses at the beginning or middle of the next month?

There shouldn't be a cost difference on the closing costs per se because this covers third party fees such as the title company fee, tax stamps, and such. The good faith estimate should have details about your closing costs. You can get a HUD-1 Settlement Statement on the day of or the day before the settlement which outlines all the closing costs and you should ask your agent if any of the numbers don't add up.