Del. Code tit. 10, § 4932

No claim or debt for work, labor, or clerk hire as prescribed in § 4931(a) of this title, shall be a lien upon any real estate unless a copy of such claim or debt is filed in the prothonotary’s office of the county in which such real estate is situated, within 1 month after it has become due and owing, or is growing due and owing. Any person presenting a copy of such claim or debt to be filed in the prothonotary’s office shall accompany it with an affidavit stating that such debt or claim is just and true. The fee to the prothonotary for such service shall be 50 cents.