Take one of your long graham crackers and using a serrated knife cut the 'roofline' of your gingerbread house. Use a serrated knife and gently saw it back and forth to get the triangle angle. To have it be even on both sides, count the dots down the side of the graham cracker.
Start by taking your cut piece and outlining it with your icing of choice. I would do the sides of the cracker on the edge pieces and line the back of the 'triangle' or front/back of the house.
Then begin pressing together the pieces of graham cracker. You can either lay the back of the house flat while you do this or hold it together with your fingers and press together. This is the messy part. I had multiple houses fall apart but since it's just graham crackers it's really easy to put back together or start over.
Adding the roof was probably the trickiest part depending on how you cut the graham cracker. I added quite a bit of extra icing to the roofline to help keep it together. Once you add the roof go around the cracker edges and add additional frosting.
Allow your house to dry for 15-30 minutes, or really as long as your helpers can wait. I assembled during my son's nap so that he could decorate basically as soon as he woke up. It sat for about 45 minutes and everything held together well!
Decorate with sprinkles, candies or icing of your choice! Use a muffin tin to set out your candies so little hands can easily help. Allow to fully dry. If storing, keep in an airtight container for 2-3 weeks. Otherwise enjoy right away or after everyone has a chance to vote or oo and aw over them!