Fume like smell coming up concrete floor

Get a plumber to put an endoscope down your drain pipes if they do go under the concrete. If that is the source of the problem it will be a big job to fix it.

the only way (without breaking out to the pipe and exposing the who run) is to get a camera survey done from you manholes the soil stack with a dart cam or similar, then plumber (with a smaller camera) to go from loos etc down, also check the sinks and showers baths havent blocked S bends as a something as simple a the sink shaving hair goes down, or a shower tray with little fall in the pipe can completely reek I gloves & goggles bang down a good watering can in each plug hole, full of dilute drain cleaning agent as a first diy effort as this will be your cheapest potential fix. Bizare as it may sound have you checked for dead rats/ pigeons etc. in loft, under boards, near boiler in warm dark spots. If the problem isn’ drain water, a cracked soil pipe etc Check out what the house was built on via land register/ title search. unfortunately many older homes did not have gas membranes or capping layers. If the house was built on s victorian tip or mine workings they didn't understand methane vents or barriers. - this can end up ££££

Hi there a inspection with a camera inside the sewage pipe would pick up a fault.in the pipe line.

soil does smell are you in a high water table area as often the case as build up of gases which would cause this . check with your mortgage or landlord or get a gas survey done which confirm this.