About 70% of my home building business consists of spec homes.  A spec home is simply a home that is built without a buyer.  It is more risky to build a home that isn't pre-sold, but it sure is easier, quicker and generally turns out nicer.  Most of the risks can be minimized by choosing a good floor plan and making sure it is built in a good location.  However, sometimes a home can sit for a while before it sells.  When that happens, there are a few things I do to get rid of it.  I rarely sell a house before it is completed and cleaned up.  I think it is odd that so many builders get a house most of the way done, but then they don't get it cleaned up and presentable.  Cleanliness sells!

Another method that really helps is to buy a few pieces of furniture and decorate a few rooms.  I have a friend at Ashley Furniture who gives me really great deals because I am a repeat customer.  They have a great selection on line www.Ashley.com.  It is amazing how much different a house feels with a few furnishings.  Often I tell the people that the furniture is included if they close within 30 days. 

Hope these tips help you too