Rich,
Annex 14 is the main ICAO document on airport design standards. There is a handy link in the stickyd threads at the top of Tech Log to an electronic version of it.
There are some other ICAO documents but these are peripheral and 99.9% of airport design can be done using Annex 14. The other documents go into more detail in certain areas. I use mainly Parts 1-3 of the following:
Aerodrome Design Manual (Doc 9157)
Part 1 Runways
Part 2 Taxiways, Aprons and Holding Bays
Part 3 Pavements
Part 4 Visual Aids
Part 5 Electrical Systems
Some other airport aspects are covered in the following, but some of them are quite dated and not of as much value:
Airport Planning Manual (Doc 9184)
Part 1 Master Planning
Part 2 Land Use and Environmental Control
Part 3 Guidelines for Consultant/Construction Services
Airport Services Manual (Doc 9137)
Part 1 Rescue and Fire Fighting
Part 2 Pavement Surface Conditions
Part 3 Bird Control and Reduction
Part 4 Fog Dispersal (withdrawn)
Part 5 Removal of Disabled Aircraft
Part 6 Control of Obstacles
Part 7 Airport Emergency Planning
Part 8 Airport Operational Services
Part 9 Airport Maintenance Practices
There is a heliport manual, but Annex 14 Vol 2 also covers heliports. The manual is:
Heliport Manual (Doc 9261).
Cheers
OverRun