This guide will show you how to upgrade the Treehouse (add a sliding pole, Growing Together) in The Sims 4.
To upgrade the treehouse, you will need to control an adult sim and level up the handiness skill to level four. You can repair broken objects or read books about handiness to level it up.
After reaching level four of the handiness skill, click on the treehouse and tap on Upgrade Treehouse. Your sim will start upgrading the treehouse.
After that, you will find a sliding pole at the back side that your sim has created. Both child and adult sims can use this pole.
