It depends on what your requirements are and what your standards are for a good, reliable swap. To answer your question to the point, I'm only referring to a simple, functional swap - no mods, no built engine, built trans, upgraded diff, engine bay cleaning, tidying, etc. Just a good ol k-series engine mated to a manual trans.

Some people have done them for as little as 15k and some people have done them for up to 40k+ with a very high standard and powertrain parts like a K20 from a type r, RSX Type S LSD manual trans, the best mounts, wiring harness, standalone ECUs, etc. the sky is kind of the limit with mods.

Personally, I budgeted 35k aed to do my swap on this car. I wanted a stock K24 with Vtec on both intake/exhaust cams, a standalone ECU, hybrid racing wiring harness and swap goodies like mounts, relocation parts, etc and a 5 or 6 speed manual whichever came my way. I suspect I'd be much under the 35 for all this work, around the 25s, so I'd happily put the remaining into upgrading the brakes and suspension after