Is it possible to heat a household oven hot enough to bake ceramics?

No.

The hottest a household oven can get is around 900°F when it's set to self-clean.

Low-firing ceramics fire at cone 06, which requires about 1800°F.

No. You'll need a kiln. I think 500 degrees and broil are the maximum, the oven's walls and the rest of it are not designed for greater heat than that. You could probably bake it for a long period, get it hard but then there's the glazing. If you don't plan on eating or drinking from the products you create...

Sure it is but only for one time. Just remove the oven thermostat. They oven will get supper hot and may catch your house on fire, but it will get hot enough to back ceramics.

Kilns usually go to 1600 degrees or higher. A household oven cannot do that, and it would be dangerous if it could.

Not really plus they aren't properly vented. Without a consistent oxygen exchange the heat will be uneven and your ceramics will be brittle.

are you seriouse ?? kilns get twice as hot as a conv. oven if not 3 times ..........wow whata stupid question ....NEXT ~!

How hot do you need it? I wouldn't attempt any more than 600F.

no