Upgrades that Sims can perform will be gradually unlocked as a Sim raises their handiness skill.
Level 3 Upgrades:
Changing the doorbell will allow a Sim to be able to choose one of many other sounds.
Improve speakers should be used on stereos and will add plus ten to the music moodlet.
Self-cleaning will allow all objects, except counters, to become self-cleaning.
Silent running will make the cheapest dish washer quiet.
Level 4 Upgrades:
Auto water results in the sprinklers turning on automatically.
Fireproof results in stoves never catching fire. This is also a level 6 for fireplaces never catching fire.
Level 5 Upgrades:
Improved pressing, only available with World Adventures, will result in one additional bottle of nectar being produced during the nectaration process.
Level 6 Upgrades:
Improved crushing results in trash compactors holding more trash.
Unbreakable results in objects never breaking again. Best if only used by those with a handiness level ten, though
Level 7 Upgrades:
Auto light results in the fireplace automatically turning on when the Sims enters the room.
Boost channels results in a Sim getting more television channels.
Faster cooking results in a Sims' microwave cooking food quicker.
Improve meal quality results in better quality meals made in the oven.
Perfect teleportation results in the teleporter lifetime reward having a 100 percent success rate.
Always good fortune, only available with World Adventures, makes sure that all fortunes given by the fortune cookie machine from China, good fortunes.
Level 8 Upgrades:
Improved graphics results in a Sim having more fun when playing computer games.
Wire house with speakers allows Sims to be in any room of their home and obtain the enjoying music moodlet.
Level 9 Upgrades:
Change fire color results in Sims being able to change the color of the flame in the fireplace.
Improve memory results in the food replicator's memory increasing so that it can store more of a particular type of meals. Ultimately, this will shorten cooking time and the time spent loading this appliance.
Flavor enhancement, only available with Sims 3 World Adventures, improves the flavor of a bottle of nectar by 15 percent.