Jen Aniston Sued -- Chicks with Decks ... Actress Allegedly Stiffs Contractor

What Jen Aniston doesn't like, Jen Aniston DESTROYS ... so says a contractor who claims Jen never paid him for building a deck at her Bel Air home ... a deck she demolished just days after it went up.

The "We're the Millers" star is being sued by J.R. Darnall Associates, Inc. -- which says it was hired to do some major renovation work to Jen's mansion back in October 2012 ... and worked on several projects until March 2013.

The contractor says there was never any problem with work or payment ... until Jen tapped the company to build a fancy $43,710 deck for a party on March 24, 2013.

The project was completed ... the party went off ... but the next day, the contractor says they received a call about a leak in the deck.

According to the lawsuit, filed in L.A. County Superior Court, the company says it offered to send an expert to the home to evaluate the situation -- but Jen had the deck ripped down before the expert could complete his inspection.

Now, the company says Jen has completely cut off all communication -- and still hasn't forked over the $43k for building the deck in the first place.

We called Jen's people for comment ... so far, no word back.