I treated the four square layers like two separate, filled cake tiers on their own cake cardboards cut down to size.
The bottom “tier” is the main part of the house. The top “tier” was carved into a triangular shape.
I inserted 5 bubble tea straws cut to the height of the bottom tier before stacking on the top tier (on it’s own cake cardboard) and crumb coated the house.
Freeze to firm things up as needed for about 20 minutes. I usually freeze after crumb coating to firm things up before applying the final coat of frosting.
Add the final coat of frosting (I used buttercream tinted electric green).
Create the melted candy coating and fondant accents- door, windows, shutters, gate, etc.
Decorate with additional spider web piping , apply candy corn "shingles", short Kit Kat stairs (optional), etc. Decorate the cake with whatever sprinkles and candies you like!