Akmal Hussain, of Colbrook Close, was prosecuted by Hillingdon Council and fined the huge sum on October 6.
The 40-year-old failed to submit a planning application to the council for his side extension, rear extension, and loft extension.
He then failed to comply with a notice forcing him to remove the extensions.
Hillingdon Council's cabinet member for planning, Councillor Keith Burrows, said: “This case illustrates a blatant disregard on behalf of Akmal Hussain for both the law and our residents.
“It is a great win for the council and sends a strong message to anyone who's thinking about breaching our planning and housing laws."
Cllr Burrows added: “The planning laws are in place to protect our residents from unsightly, unneighbourly and illegal extensions to property and to avoid increased pressures on local infrastructure and amenities.”
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