Surface

A surface is a type of buy mode object that has appeared throughout The Sims series. They are primarily used to hold small objects like decorations, books, computers, and food that cannot be placed on or are not usable while on the ground. Sims tend to only be able to use objects on a surface if there is a chair next to it.

In general, surfaces are divided into five categories: counters, tables, end tables, coffee tables and desks, though not all games use the same category names. Some games might consist of cabinets, displays and shelves in this type. Counters are required for meals that require preparation. Island counters and dining tables can be used as eating surfaces if a stool or chair is located next to it. The one common attribute all surface objects share is the usage of holding small items, usually that are decorative.

Coffee tables and end tables
Sims will typically use end tables for placing unpaid bills, newspapers, and magazines on, and may use coffee tables if there are no suitable end tables nearby. Sims will usually look for coffee tables when putting down a coffee mug, if there isn't any accessible end table around.

Counters
Counters and island counters are mainly used for the preparation of meals; food cannot be prepared without a preparation surface object. Counters, just like any surface object, can hold small decorative objects. Small appliances and cash registers can only be placed down on and function properly on a counter. Meals will also typically be placed on a counter when they are finished. When a pizza is picked up by a Sim or munchie bot, they will leave it on a counter if there is no accessible desk on the lot.

In The Sims 2 and The Sims 4, dishwashers and trash compactors must be placed under a regular counter. This is not a requirement in The Sims 3. In The Sims, dishwashers and trash compactors cannot be placed under a counter and are always standalone appliances, although objects, including plates, can be placed on top of them. A counter that has a dishwasher or trash compactor underneath cannot have sinks placed on them, as there is no room for the basin and the pipes.

In The Sims 2, Sims preparing a meal on a kitchen counter will open the drawers to obtain cooking utensils, such as spoons and cooking pots. If the counter does not have drawers, or if a dishwasher or trash compactor has been placed underneath the counter (thus taking the space of the drawers), they will simply "generate" the needed utensils out of thin air. Served meals placed on an island counter can only be accessed from the drawer side, meaning Sim will get up from their stool to eat or put it away from the same counter.

In The Sims 2, players do not need to hold down the key in order to place multiple countertops at a time.

Some commercial counters are only available for community lots, and cannot be placed on residential lots.

Vampires can fly over counters when they have transformed into bats.

Tables
Tables are typically used as dining tables, where Sims will eat their meals whilst sitting at. The number of plates that can be served on a table depends on the size of the table and the number of chairs surrounding it. Sims can eat from the tables as long as there is a chair located next to it facing inward. Once all available spots have been filled, the serving Sim will place the serving platter or bowl in the middle of the table, or on an empty countertop. Certain interactions, such as toasting, are only available while sitting at a table.

Tables can also be used to hold small items, including small decorative objects. In The Sims 2, some of these decorative objects will prevent other objects, including plates, from being placed on the table. A mod from Mod The Sims is available that fixes this.

Desks are a type of table that are primarily used for doing homework on, and are good locations for computers to be placed. These are typically only usable by one Sim at a time, and the chair must be on the front side of the desk in order to work. Desks and tables can be used interchangeably; computers and homework can be placed on dining tables, and Sims can eat at desks if there are no other surfaces available to eat from.

Shelves
In Open for Business, shelves are used to display merchandise for sale in an owned business. Depending on the type of shelf and the size of the objects being displayed, up to six items can be placed on a shelf at a time. When playing the lot as the owner, Sims can set the display item price for all items on the shelf at once by clicking on the shelf, or set the price for each individual object in Wholesale Mode. In addition, if any one of the items on the shelf are sold, clicking on the shelf will provide an option to restock all the items on the display at once.

The Decra-Display by Refrigifreeze, a commercial refrigerator, can store and sell food and produce. Items placed in the refrigerator will be "locked" in its current state and will not spoil.

The Magisplay Tray is a display tray that allows large objects to be placed on other surfaces that normally cannot hold such objects. However, it does not appear to work properly on desks.

Various wall shelves from Apartment Life allow for small decorative objects to be placed on walls.