Is the Lake House DLC included in the Standard Edition of Alan Wake 2?

No, the Lake House DLC is not included in the Standard Edition of Alan Wake 2.

The Lake House is included as part of the Deluxe Edition or Deluxe Upgrade.

The Standard Edition can be updated to Deluxe Edition by purchasing the Deluxe Upgrade, which provides access to both expansions.

The Night Springs expansion and The Lake House Expansion can not be purchased individually.