The mural shows Mary Poppins holding an umbrella and a carpet bag, flying towards a real-life chimney in the outline of a red heart.
Planning Committee chair James Husband said previously that it was “quite clear” the painting had breached planning controls, while committee member Sam Mackover said it was “unfortunate that things have happened like this” but that enforcement action was necessary.
Spens appealed against the enforcement notice, telling the council that a planning application he submitted had not been validated because he could not confirm the ownership of the rooftop wall.
He said he had always treated the wall as his own and likened the mural to artwork visible through someone’s window.
He said: “It’s just a painting of Mary Poppins, a picture of hope. I’m not trying to cause offence, and I apologise if I have caused any trouble.”