Hi,
Sorry for the long post but trying to give as much info as possible.
I have a detached house and for the last fortnight, theres been a stong sewage smell in the house. It comes and goes but is generally strong. It is strongest in hall as you enter property and under the stairs cupboard. I lifted the boards in the cupbard and theres no obvious problem apparant in area I can see. Few things to note:
*Small WC near the hall is always blocked
*Had external drains checked by scottish water
*Had a drainage company out to blast water through the pipes
*Although the smell is worst in hall, I can smell it on and off in other rooms in house (i.e. other bathrooms mainly but find its just wafting everywhere now)
*I had a new kitchen installed recently. No major overall to plumbing i.e washing machine, dishwasher etc all new but went back to same places. A new radiator was added to kitchen but no smell in that area. FYI, kitchen as front of house off hall. Kitchen doesnt smell generally but i can definetely smell "the smell" under the cabinets where sink/dishwasher/washing machine are placed.
I'm at my wits end - total nightmare and having real difficulty finding a tradesperson who will help me investigate :(
Any thoughts greatfully recieved.