Simon Jones, who runs the Loft Conversion Centre in South Road, Brighton, had a surprise when he was rummaging for work materials.
He found a cat, which must have climbed in through a tiny hole in the back, sitting there with four kittens.
Rather than chuck out the intruders, Mr Jones has been keen to look after them and has even been providing them with food.
Now all he needs is more money for the kitty.
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