Really hoping someone can suggest a solution to this problem.
I have had cats all my life (I'm 47) and never had this issue before.
After our family cat of 10 years died suddenly, we got two kittens, sisters A + B. They were moggies and far too young to be away from their mother, and we took them because everyone in the house loves cats (3 kids) and they needed a home. Definitely a new experience for us -previous 2 cats had been pure breeds and stayed with their mother until a little older.
The kittens seemed to settle in fine, although one (A) was always a little nervous and would occasionally wee/spray but not very often.
About 2 years later we took on another two kittens; siblings, one a tom, C + D. Probably a mistake, with hindsight (we rocked the boat?) , but there were reasons at the time. We have a large victorian home and garden -have chickens and bees too, so a reasonable amount of space in a rural location. We didn't seem to have great difficulty settling the new kittens in; at first the pairs kept to different areas of the house and garden and then just gradually integrated.
Maybe a year after the new kittens settled in, A (who had always had the occasional wee/spray) started spraying a lot more. We started to suspect that her spraying was making the others start too (judging by the sheer number of wet patches, yellowy spray marks up walls etc).
Then we had a disaster. We presume something died under our old floor boards. A terrible smell took over a room. Cat A started urinating and spraying all over the room, the other 3 joined in, and we just had a horrendous smell that resulted in a carpet, all underlay being thrown out and the floor boards needing bleached etc.
Ever since we've basically had 4 cats who urinate and spray everywhere.
Tried feliway, urine scent neutraliser etc. Cats have seen the vet, all healthy and well.
We seem to be stuck with 4 young cats that can't come in the house...and we're missing out on a lot of what we all love about having cats.
As a temporary measure we installed cat flaps for our utility room and on a small sunroom so the cats would have indoor spaces that don't have soft furnishings. Plenty of beds and climbing areas in each. Through the winter added electric heat pads to the beds. Stopped allowing them in the house while we had a deep clean and dealt with any left over scent from all the spraying. But even after this, any cat that gets in the house accidentally, immediately sprays everywhere. Recently we tried introducing the tom back into the house for a cuddle now and again; he's a confident and chilled out character, but after a couple of visits, he sat on the sofa and completely emptied his bladder.
A couple of the cats are real lap cats and it's just so sad that we can't have them in to just sit around on the sofas with us.
Can this situation ever improve or is this it now?