Asisreo
Patron Badass
If a DM uses hitpoints, the DMG says to divide it into large sections if the object is huge or bigger. Which means it's just as easy to break (or at least make an hole large enough to pass through).When I think of a portcullis I think of one at a castle gate. And those are huge - which means that they do not have any sort of defined hit points.
Page 104 of the DMG:Where does it say that? And how are you going to bend portcullis bars?
"If a character can't reach the winch (usually because it is on the other side of the portcullis), lifting the portcullis or bending its bars far enough apart to pass through them requires a successful Strength check. The DC of the check depends on the size and weight of the portcullis or the thickness of its bars. To determine an appropriate DC, see chapter 8. "
It depends. In the real world, it's not like all residential houses have defenses that prevent the most savvy thieves, so is it reasonable that all castle portcullis' are made specifically heavy enough to prevent characters that can lift unreasonable weights?This is precisely why portcullises are heavy. If it's known that very few people can lift in excess of 600lbs then I'd expect a reasonable portcullis to weigh upwards of 750lbs. More if Goliaths are around. They aren't designed to make things easy for the fighter - quite the reverse. And as they are lifted by a winch and pulley weight doesn't matter that much.
A very secure, important castle might have the front door portcullis extremely fortified. But would they bother with every indoor portcullis? Realistically, they might not depending on cost, labor, etc.
And a nation that's known peace for centuries might not even have maintained their portcullis' because they simply grew lax.
Put simply, it mostly depends on context.