The National Association of Home Builders (NAHB) releases its Housing Market Index monthly to record builder sentiment on the demand side of the single-family housing market. The index is frequently used in assessments of housing market conditions. It is derived from a survey of builders who rate the market based on sales and expectations.

Source and Data Release: https://www.nahb.org/en/research/housing-economics/housing-indexes/housing-market-index.aspx

The National Association of Realtors releases updated numbers on housing affordability monthly. The measure is an index in which the value of 100 means a family has exactly enough income to quality for a mortgage on a median-priced home. Measures above 100 mean that a family has more than enough income to qualify. Since the housing bubble, home affordability has been high, a positive sign for a recovery in demand.

Source: http://research.stlouisfed.org/fred2/series/COMPHAI

Data Release: http://www.realtor.org/topics/housing-affordability-index