Replacing 3/8 inch hardwood with 3/4 inch hardwood
You should buy the 3/4" - Low-cost hardwood flooring... what&#39;s the catch?.

All you will need is a jamb saw - the overkill and easy one.

The traditional jamb saw.



And I used to use the tradition saw but moved on to using a Dremel with a wood bit.



Now all that you have to do is uninstall old wood and then get a scrap of the new wood, lay saw on top of new wood on each jamb and cut.  I would plan on about 5 minutes per jamb - if you have experience maybe half the time.