Reply is too late to help you but this is for anyone else in the future that may need any ideas. In my sixth grade class we had to draw out a floor plan of a house and then build it. We used balsa wood which works perfectly and used hot glue to put it together. We even had fake money and bills we had to pay. I don't know what building a house has to do with science though.
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3D origami House You owe me a cookie :D
Thick card-stock and glue as lemonie suggests...
Also, you can use that foam-posterboard for a bit thicker walls which you can pin together.
Is this a scale model or anything goes dollhouse? I guess you would get points for doing an architectual model of a famous building or home like Frank Lloyd Wright or of a style. If it is for science class maybe it is to demonstrate how to hurricane proof it or design it to resist an earthquake.
You can search for numerous houseplans and actually print them out to a scale that you can build. Paste the different views of the floorplan to cardboard and then start putting the house together. You can even go to the IKEA website to furnish a room and print those out. Get the layout and the wall views. Fold a big piece of cardboard for the roof. You can get fancy and start adding beams across the roof by using pencils/skewers. Get creative. And don't forget about the landscaping of the grounds outside the house if needed. Good luck.
Cardboard + glue?
epic gingerbread house