I bought two of these cat houses for a couple of stray cats that live on my back patio.  These houses literally took about 5 minutes to put together and with absolutely no tools!  Thumb screws are used to secure the pieces together.  At least one of the two cats are using the house as shelter.  This morning it rained for the first time since placing the houses outside and cat was completely dry inside.  They also look like they will hold up nicely over time.  Very pleased with this purchase.