Copied/pasted from my FAQ page on my site (more stuff like this there for your enjoyment):
http://www.expaircraft.com/faq.htm
Who can perform these inspections?
With few exceptions, only an FAA Certified Repair Station (CRS) with the appropriate ratings may perform the inspections required by CFR 91.411 and 91.413.
Can a builder with a repairman certificate for the aircraft he built perform his own altimeter, static or transponder certifications?
The FAR?s authorize the "manufacturer" of the aircraft to conduct the tests However, the builder of an amateur-built aircraft does not meet the FAA?s definition of a manufacturer. The FAA, in Order 8130.2, defines a manufacturer as a Production Approval Holder (PAH). Some examples of a PAH would be the holder of a Production Certificate (PC), a Parts Manufacturing Authority (PMA), and Technical Standards Order Authorization (TSOA). An amateur builder does not fit this definition. Thus, the amateur-builder cannot perform the transponder and pitot/static tests on his/her homebuilt.