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Is this house Detatched, Semi, Terrace, or flat?
If it's semi , terrace or flat it may not be your drains causing the smell.
In fact it may not be drains at all.
Try pouring something with a strong odour, like mouthwash or Jeyes fluid or bleach (a whole bottle not just a drop), down the kitchen sink waste.
If the smell comes out in the affected rooms it confirms it's an open drain venting to inside. If it does you may be able to pin it down to a room.
If it's semi , terrace or flat it may not be your drains causing the smell.
In fact it may not be drains at all.
Try pouring something with a strong odour, like mouthwash or Jeyes fluid or bleach (a whole bottle not just a drop), down the kitchen sink waste.
If the smell comes out in the affected rooms it confirms it's an open drain venting to inside. If it does you may be able to pin it down to a room.