How long should a MTF transwoman wait before going for a breast augmentation surgery?

Ideally, you should be on optimal hormones for 18-24 months prior to a breast augmentation.  Make sure your hormone dosage is appropriate for you.

Hello and thank you for your question. Board-certified plastic surgeons will likely disagree about how long to wait before having a breast augmentation surgery after having begun hormone replacement therapy. You should allow enough time for the hormones to help your breasts develop, and this amount of time will vary form individual to individual. On average, however, 18 to 24 months should allow enough time for breast tissue to develop in most patients. Schedule several in-person consultations with board-certified plastic surgeons in your area and select a surgeon with significant experience treating transgender females and get their recommendation. Good luck!
Michael Eisemann M.D.
Plastic Surgeon
Houston, Texas 

There is not an specific time. Do the surgery as soon as you feel is the right moment.Carlos Gonzalez Legarda, MD

Different doctors have different opinions. Most patients will start to see change and the only question is how long will they continue to enlarge. I would be inclined to go ahead if there has been NO change.