This is my massive wooden Minecraft mansion build in a plains biome and it uses around 8,233 blocks, not including interior items.

The main block types used here are oak, dark oak, spruce, deepslate, and stone brick. Generally basic materials.

Interior design work is done and includes a kitchen, several workshop areas, storage room, brewing area, and more.

A tutorial on how to build the house itself in your own world is on YouTube, and it's the largest tutorial house on my channel (so far).

Here's the tutorial's full materials list and block count for the house itself (copy+pasted from my spreadsheet):

blue orchid	54
cobbled deepslate	6
cobbled deepslate stairs	64
cobbled deepslate wall	220
dark oak door	6
dark oak fence	40
dark oak stairs	628
deepslate brick slab	48
deepslate brick stairs	8
deepslate brick wall	48
deepslate bricks	146
dirt path	40
iron trapdoor	4
lantern	58
light blue stained glass pane	56
light gray wool	84
oak door	2
oak leaves	251
oak planks	220
oak trapdoor	112
sea lantern	4
spruce door	2
spruce fence	86
spruce leaves	12
spruce log	574
spruce planks	2332
spruce sign	8
spruce slab	438
spruce stairs	196
stone brick slab	500
stone brick stairs	484
stone brick wall	88
stone bricks	574
stripped dark oak log	78
stripped oak log	356
stripped spruce log	246
water bucket	2
white stained glass pane	158
total	8233