Columns, made by me.
Gargoyles, made by Modelfundgrube - https://3dwarehouse.sketchup.com/model/u42eff7ca-ead3-4f0b-adbf-f0e6f2a5ee3d/harry-potter-gargoyle
3. Fat Lady by Edoardo Montegrandi - https://3dwarehouse.sketchup.com/model/481a87ca-9073-49e2-8b1f-c2468cbb9c72/Harry-Potter-The-Fat-Lady-Portrait
4. House banners, images from https://www.clipartmax.com/middle/m2i8b1d3i8m2K9m2_harry-potter-house-crests-hufflepuff-download-harry-potter-houses-banner/
5. Chandelier by huynh - https://3dwarehouse.sketchup.com/model/d412d22c-7548-4d68-a224-e36607ffe6f1/Chandelier
6. Deathly hallows by Daniel - https://3dwarehouse.sketchup.com/model/u4b6fbbf1-779c-458c-aaae-1fce6f92ab2a/The-Deathly-Hallows
7. Table, created by me.
8. Chairs, created by me.
9. Rug, image from https://www.pngall.com/rug-png/download/16897
10. Sorting hat by Apz - https://3dwarehouse.sketchup.com/model/76acb080-417b-4947-954d-23ca278d4e75/Sorting-Hat
11. Snitch by Farzaneh K. - https://3dwarehouse.sketchup.com/model/fc9f6f55-17ec-474c-8b98-c0fde4d716e3/harry-potterballquidditch
12. Wand by Bob Jenkins - https://3dwarehouse.sketchup.com/model/6e27a173a8ceb508b9ed4e7dd060f424/Harry-Potters-Wand
13. Nimbus 2000 by Patrick - https://3dwarehouse.sketchup.com/model/3a271502de5f226bb57988a5f0324ef3/Nimbus-2000-20
14. Dueling Club by Edoardo Montegrandi - https://3dwarehouse.sketchup.com/model/e56efe18-971f-4b29-990b-7354c8e0bc04/Harry-Potter-Dueling-Club
15. Harry Potter by David - https://3dwarehouse.sketchup.com/model/d7b28224c90d8ef56b1ec008cc77901/Harry-Potter