Chambers

The offices of a judge and his or her staff.

Additional Sources

FindLaw

The private office where a judge carries on business other than court sessions.

Law.com Dictionary

The private office of a judge, usually close to the courtroom so that the judge can enter the court from behind the bench and not encounter people on the way. Judges hear some motions, discuss formal legal problems like jury instructions, or conduct hearings on sensitive matters such as adoptions "in chambers."

The Free (Legal) Dictionary

The private office of a judge, usually close to the courtroom so that the judge can enter the court from back of the bench and not encounter people on the way. Judges hear some motions, discuss formal legal problems like jury instructions, or conduct hearings on sensitive matters such as adoptions "in chambers."

Wikipedia

judge's chambers - often just called his or her chambers - is the office of a judge.

Chambers may also refer to the type of courtroom where motions related to matter of procedure are heard.