A Charedi father must pay more than £12,000 after refusing to demolish an illegal extension at his family home.
Ben Feiner, of Kings Close, Hendon, admitted a charge of breaching an enforcement notice at Brent Magistrates' Court earlier this month.
The notice, issued by Barnet Council during a six-year dispute, required Mr Feiner to remove the first floor structure which was built without planning permission.
But Mr Feiner said he felt he had "done the right thing" by refusing to pull the extension down and then rebuild it to the same dimensions once permission had been granted.
He said: "We didn't comply because the particular part they wanted us to pull down is now permitted.
"You win some, you lose some. It's about what is right and what is wrong. Once the council makes its mind up they don't care what happens to you."
Councillor Richard Cornelius, cabinet member for housing and planning, said: "Planning law exists to protect residents from inappropriate development and this is an example of the process working as it should to do just this."