What do look out for when viewing?

We currently own a house we got through inheritance, so we've never actually been through a house buying process.

We've started looking as we need more bedrooms, and it seems in the area we want, new builds are the only ones big enough.

We've arranged to go view a ready to go build, there are no show homes, so it's just a completed shell.

What do we need to consider? We've some concerns about noise due to a motorway and railway line (though we already hear both from our current house, and when I asked they described extra noise insulation stuff in the house).

We're going to measure up things like our kitchen table to be able to get a feeling for how that will fit in.

Are there any typical things to check over, like you see people advising when going to buy a car. Any new build specifics?