A celebrity hairstylist whose clients have included everyone from Kate Moss to Richard Gere is suing his Madison Avenue landlord for not fixing his moldy, leaky office, according to new court papers.

Julien Farel — whose flagship Restore Salon & Spa is in the Loews Park Avenue Regency New York — has been forced out of his separate work space a few blocks away because of a leaky roof, his Manhattan Supreme Court suit claims.

The leaks — which left him and staffers working amid puddles and a “terrible’’ smell — began in January and were completely ignored by the landlord, the document states.

“There are puddles everywhere and all ceiling panels & many other areas need to be broken into for mold…The smell is terrible and worsening and we are concerned for our health,” Farel wrote in a Feb. 27 email to the landlord, Stove Properties USA Inc., according to his suit.

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Some employees fell ill because of the conditions, and one eventually quit, the document states.

Farel — who had been in the space since 2001 — fled the property along with his staffers in March, the lawsuit says.

The hair dresser to the stars now wants a judge to allow him to break his lease more than a year early.

Farel also is suing Stove Properties — which the court papers says is “indirectly owned by an affiliate of billionaire and convicted tax evader H. Ty Warner” — for $400,000 in damages. The plaintiff says he was forced to take matters into his own hands at one point by moving salon products from the space and hiring a mold expert, according to the court documents.

“Julien and [wife] Suelyn Farel have expended a tremendous amount of time, effort, energy and expense in creating, curating and maintaining a first class experience for their clientele at the Regency Hotel on Park Avenue and expect their Madison Avenue landlord to maintain the space to the exacting standards they contracted for,” said Farel’s lawyer, Terrence Oved.

The Post was unable to find a working phone number for Stove Properties. A lawyer who represents the landlord in another case did not return requests for comment.