There are certain items that can stop spawns but if you have 3 or more of these items within a 40 meter radius of each other then this can possibly trigger a raid event. There's a video on YouTube that tells you which of these can trigger raid events.

Originally posted by Saakuya:

I have a small base. if i build some random workbenches in there i cant get raided, am i right?
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NOTHING prevents raids from happening (vanilla game)... Every 40-something minutes, the game [silently] "rolls the dice" to see if a raid is triggered (or not), and no placed-items stop that from happening.

The further into the game progression, the player goes, and also killing certain enemies, adds harder and harder raids to the "pool" of possible raids (that the game rolls for every 40-some mins.)

This means you must prepare defenses (of some sort), to try to prevent the raids from destroying all your stuff.

This means Palisade fencing (worthless), spikes (almost worthless), or something more substantial such as earthen walls or trenches, or a combination of both

https://steamcommunity.com/sharedfiles/filedetails/?id=2855607648
https://steamcommunity.com/sharedfiles/filedetails/?id=2855607895

OR find other creative ways to find safe shelter, such as under/inside copper nodes

https://steamcommunity.com/sharedfiles/filedetails/?id=2858961419
https://steamcommunity.com/sharedfiles/filedetails/?id=2908645454

or under the Elder altar...

https://steamcommunity.com/sharedfiles/filedetails/?id=2855621495
https://steamcommunity.com/sharedfiles/filedetails/?id=2847464543
https://steamcommunity.com/sharedfiles/filedetails/?id=2858966733

High up in the indestructible trees of the swamp or high up on rock pillars, etc (find places the enemies are likely not going to be able to reach you.

https://steamcommunity.com/sharedfiles/filedetails/?id=2908647883
https://steamcommunity.com/sharedfiles/filedetails/?id=2661983674

Essentially find creative ways to protect your stuff.

kinda, Certain items suppress spawns in a radius around them. You need to fill out an entire area with beds, benches, or campfires. This would stop mobs from spawning when the raid happens. However your are talking a 150 meter circle around your base with enough items that every inch is covered by their area of effect radius. So um Good Luck

Or build on an island. dig a moat or build an earthen wall.

You can cover an island with stuff that suppresses spawns and the mobs won't spawn during the raid

Small base? No. Raid spawns cover a large area. That entire red circle you see on the mini-map basically. They are intended to spawn out of view and rush towards the player/base. If you don't have that entire possible spawn area blocked off then they are still going to spawn, though you will prevent regular mobs from spawning inside your base which is always good. No one wants to wake up to a greyling at their bedside.

As others mentioned though, them still spawning for raids isn't necessarily a problem if they are incapable of reaching you anyway. Trenches and earth walls are great for this, you can just wait out the raid timer in blissful peace in most cases (be aware of the limitations of your base defenses, like fliers are a weakness for most bases even with the trenches or walls since you know, fliers, can go right over them...or trolls can be a problem to because of their extensive reach. The trench may stop them but they can still strike things near your walls/trenches if there are things there to strike).

You will still get raided occasionally if you stay there too long at a time. But the workbenches will prevent random enemies from just spawning in there. Raids and enemies just generally spawning are separate.

raids happen where workstations are.