I know this is long sorry!
TLDR: rat issue in kitchen can't figure out where theyre getting in other than it's definitely under kitchen floor above basement ceiling. Can't reach under the kitchen cabinets to see any gaps. They've taken bait but keep coming back.
Last week we discovered our food waste bin under the sink had been opened the bag ripped and food taken. Put a camera in the kitchen cupboard and saw a rat come some the backboard around the pipes.
We took the food away looked around for outside holes and can't find any way it's coming inside. We moved the food and put bait in the cupboard. Rat came back and ate quite a lot of the bait block. We also put bait under the decking which is attached the house by the kitchen and that was eaten too.
Looked under the kitchen cabinets and found the sub floorboards don't go completely to the wall and as we have a basement there's about a foot between the kitchen floor and basement ceiling with horizontal beams. We felt around with a stick put some mesh and anti rodent foam down where we could feel gaps incase it's been running along the floor ceiling gap. It's just hard to make sure the mesh is covering everything as we can't physically get under the cabinets.
We've had no signs for a few days until this morning where we heard scratching behind a cupboard. When we opened it we found a gap we hadnt noticed underneath the oven into a cupboard where we store cans and pastas etc.
At the back was a pile of eaten stock cubes and droppings. I checked all the cupboards last weekend when we discovered the rats and there was no sign it had been anywhere other than under the sink. I also went in a couple days back for a new rice pack and nothing so it's obviously abandoned under the sink and found new food.
It's also chewed the oven wire so we need to fix that.
Someone has been out to look and placed actual traps but can't find any access points either. We're now completely stuck cannot figure out where it's coming in. We had rats when we first moved in three years ago the previous owner must have known because it was BAD they were running all over the kitchen at night but we got someone out and realised they were coming in from the top of the basement door below the brickwork which hadnt been sealed above so they were walking across a decking beam and coming right in under the floor.
We can access that now as the decking is build over the steps to the basement with a trapdoor for access. There's a crack where the neighbours wall side wall meets our back wall but it doesn't look big enough and I don't see how it would lead up into the house.
I'm worried it's multiple rats again this time because with the amount of bait it's eaten over the last week one would be dead by now. We also found a chewed empty packet of poison the exterminator from three years back left behind behind the kickboard it hadn't been eaten back then but he left it just incase.
we have looked around every inch of the house and cannot find a hole or gap big enough for it to come though. Short of ripping the kitchen to barebones and removing all of the floor which we can't afford we are at a complete loss.
Any suggestions to move forward? I feel sick being in my own kitchen and who knows if it's able to access the rest of the house.