Hackney Council claims that a strictly Orthodox synagogue, built without planning permission in Stamford Hill, is "blocking the sunlight" of nearby families and says its extension must be demolished.
The synagogue, in Bethune Road, was served with an enforcement notice and given three months to demolish an extension and turn the building back into a family home.
The council alleges that notices have so far been "ignored" by the shul.
Yankel Grossberger of Satmar Limited is appealing against the enforcement notice on the extension and a public inquiry will be held at Hackney Town Hall on Tuesday.