You can make huge house in Minecraft, follow the simple steps below

Make a huge base for the house (Something like 20 x 30 blocks)

Create the wall about 10 blocks high.

(Optional) You can either do step 4 or step 3 it does not matter. Make a ceiling all around the top of your house.

Make doors for any gaps so mobs won’t come in your house.

Place torches in your house for some light.

Place torches outside your house to prevent aggressive mob spawning.

Create 1×4 holes in the front of your house. Fill the holes in with glass for windows.

(Optional) Dig out the space on your floor and replace it with any nice block you would like.

Put a crafting table, large chest, 2 furnaces, and a bed.