Changes

Finally we can start to actually build the house. Activate your mallet and make sure you have at least one handful of large nails and a plank in your inventory, right click on a side of your house and select build, pick door, wall or window after your choice (remember that you need a door to be able to enter the house though) repeat this on all the walls.  When you have put the first plank and nails into every wall, door and window section in the plan, the roof will appear automatically - no extra materials are needed to make roof.  Next you will have to pick upmore planks and continue to build, 19 more times on every wall to be exact since they all need 20 planks total.