Keen Senses: Elves, Gnomes, Halflings and Half-elves receive a +2 racial bonus on Perception skill checks.

Trapfinding. A rogue adds 1/2 her level to Perception skill checks made to locate traps.

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Check: Perception has a number of uses, the most common of which is an opposed check versus an opponent’s Stealth check to notice the opponent and avoid being surprised. If you are successful, you notice the opponent and can react accordingly. If you fail, your opponent can take a variety of actions, including sneaking past you and attacking you.

Perception is also used to notice fine details in the environment. The DC to notice such details varies depending upon distance, the environment, and how noticeable the detail is. The following table gives a number of guidelines.

DetailPerception DC
Hear the sound of battle–10
Notice the stench of rotting garbage–10
Detect the smell of smoke0
Hear the details of a conversation0
Notice a visible creature0
Determine if food is spoiled5
Hear the sound of a creature walking10
Hear the details of a whispered conversation15
Find the average concealed door15
Hear the sound of a key being turned in a lock20
Find the average secret door20
Hear a bow being drawn25
Sense a burrowing creature underneath you25
Notice a pickpocketOpposed by Sleight of Hand
Notice a creature using StealthOpposed by Stealth
Find a hidden trapVaries by trap
Identify the powers of a potion through taste15 + the potion’s caster level
Perception ModifiersDC Modifier
Distance to the source, object, or creature+1/10 feet
Through a closed door+5
Through a wall+10/foot of thickness
Favorable conditions1–2
Unfavorable conditions1+2
Terrible conditions2+5
Creature making the check is distracted+5
Creature making the check is asleep+10
Creature or object is invisible+20
1 Favorable and unfavorable conditions depend upon the sense being used to make the check. For example, bright light might decrease the DC of checks involving sight, while torchlight or moonlight might increase the DC. Background noise might increase a DC involving hearing, while competing odors might increase the DC of a check involving scent.
2 As for unfavorable conditions, but more extreme. For example, candlelight for DCs involving sight, a roaring dragon for DCs involving hearing, and an overpowering stench covering the area for DCs involving scent.

Action: Most Perception checks are reactive, made in response to observable stimulus. Intentionally searching for stimulus is a move action.

Try Again: Yes. You can try to sense something you missed the first time, so long as the stimulus is still present.

Special: Elves, half-elves, gnomes, and halflings receive a +2 racial bonus on Perception checks. Creatures with the scent special quality have a +8 bonus on Perception checks made to detect a scent. Creatures with the tremorsense special quality have a +8 bonus on Perception checks against creatures touching the ground and automatically make any such checks within their range. For more on special qualities, see Special Abilities.

A spellcaster with a hawk or owl familiar gains a +3 bonus on Perception checks. If you have the Alertness feat, you get a bonus on Perception checks (see Feats).