What would cause sewage smell in bathroom after new remodel?

Question: We just remodeled our entire bathroom replaced the tub, sink, floor tile, and toilet. Our restroom now has a sewage smell what could be causing this? Do you think they didn’t install the toilet correctly?

Bathroom Vanity

There are a few things that can cause a foul smell of sewer gas in a home.  One is improper venting of the drains.  All drain lines must be connected to a vent pipe that extends through the roof to let the sewer gas escape to the outside.  The vent may be connected but clogged and not letting the gas out or the plumber installed it incorrectly.  The other cause may be the lack of a trap in a drain line.  A trap is the u shaped pipe you see under the sink in the drain piping.  All drains must have a trap in them including the shower, bath tub, and bathroom sinks.  Toilets have the trap integrated in the bowl not in the drain piping of the house.  The trap is designed to hold water at a level that prevents any sewer gas from escaping back into the room.  If the plumber did not install a trap or if the trap does not have any water in it then you may get the smell from there.

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