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Every Sim will need to satisfy their basic needs, including hunger, sleep, and hygiene. In order to satisfy these three basic needs, Sims 3 houses must include certain Sims 3 objects. What is most important when first furnishing a home with essentials is to think cheap. Sims can always upgrade to more expensive objects once they get a job and start earning some money.
A bed is a necessity when furnishing a Sims home. All Sims will need a bed, and if there are any toddlers in the house or infants being born, cribs will be necessary. Initially, buying the cheapest bed is fine, but as Sims begin to earn more money, they should upgrade to a more expensive, more comfortable bed for themselves and their family members. Better beds will allow Sims to get better, more restful sleep. Sims' bedrooms should also have at least one light.
Sims need to eat, so they will need a small kitchen. The kitchen should have a refrigerator and a counter at the absolute least. However, adding an additional counter, a sink, a garbage can, an oven, and a smoke detector is a good idea. Having only a refrigerator and a counter top severely limits what a Sim can eat. Sims need good, wholesome foods to maintain energy, health, and a good mood. It is a good idea to upgrade to a more expensive refrigerator and oven once a Sim can afford to do so. When more money is available all Sims 3 houses should also have a food processor. A coffee pot is never necessary, but can be nice when Sims have extra cash to spend.
Hygiene is essential for Sims. In a Sims bathroom, a shower or bathtub, and a toilet are absolutely necessary. A sink is nice to have, but not a necessity so Sims can wait until they have extra cash to buy a sink. Bathroom items should be the last to be upgraded because a comfortable bed, a nice refrigerator, and a nice stove are more important.