The standard traffic pattern altitude used to be 800ft AGL, but in April of 2013 that changed when the FAA’s Charting Group met. After several meetings they decided the following:
Chris Criswell, AJV-22, reported that, per ACF recommendation, all traffic pattern altitudes, standard and non-standard, will be added into NASR (the AFD) for all airports. This will be a day forward implementation beginning in July 2014.
After it’s implementation, the Chart Supplement (formerly called Airport/Facility Directory or A/FD) was made more up-to-date. It will typically list the Traffic Pattern Altitude (TPA) if it is non-standard (not 1000ft/1500ft AGL). In Infinite Flight, the standard traffic pattern is 1000ft AAL for prop aircraft and 1500ft AAL for jet aircraft.