Producer Mark Gordon and scribe Michael Seitzman are now two-for-two this pilot season, scoring a greenlight from CBS for their Washington, D.C.-based drama “House Rules.”

Eye has also greenlit laffer “The Fish Tank,” from scribes Cathy Yuspa and Josh Goldsmith, and the hour-long “A Marriage,” from “Thirtysomething” creators Marshall Herskovitz and Ed Zwick.

The “House Rules” pickup comes just days after ABC picked up another Mark Gordon Co. project penned by Seitzman (“North Country”), the Manhattan sudser “Empire State.”

“House Rules” revolves around the freshman class of elected representatives in Washington.

Seitzman will exec produce with Gordon and Deborah Spera. ABC Studios is behind the pilot.

As for “The Fish Tank,” laffer centers on a teen who suddenly gets his parents’ house to himself five days a week.

Sony Pictures TV is behind the cast-contingent comedy pilot. Yuspa and Goldsmith’s credits include “‘Til Death,” “King of Queens” and the feature “What Women Want.”

Then there’s “A Marriage,” which — if it goes to air — would rep the first series developed for TV by Zwick and Herskovitz in nearly ten years, since 1999’s “Once and Again.”

The duo were also behind last year’s short-lived NBC drama “Quarterlife,” which began life as a web series.

“A Marriage” returns to Zwick and Herskovitz’s bread and butter — a family drama, this time about a marriage that works.

The duo are exec producing through their Bedford Falls shingle — there’s no studio attached. Zwick is directing.