Having done a lot of home building, remodeling, repair, and demo work the first thing I have to say is if this is what he does for a living he will not want a knife for this purpose. He'll know there are much better/safer tools for the job.
The Becker BK3 or CPK Fireman's Knife are built for that type use but are heavy and bulky to actually carry on your person. And if you have to reach for a tool anyway ... there are much better/safer options.
If you're set on getting him a knife and just want a tough easy to sharpen knife that can take some abuse, but isn't actually a great demo tool or even a great knife (as in simply cutting stuff) and is relatively inexpensive ... an Esse 5 or Becker BK2.
If you really want a crazy tough knife that can handle being used to pry and beat through wood and nails ... a CPK or Busse would be the way to go.
If you want to get him a good quality fixed blade knife to have when he actually needs a cutting tool something in the 3" to 4" that carries easily and doesn't get in the way would be my suggestion. Something in Cruwear, 3V, or AEB-L would be good options. A Bradford 3.5 sheepsfoot in AEB-L or 3V would be a good option if you think he'd break a finer tipped drop point blade.
With all that said ... I carry a CPK EDC almost daily and have used it cut about every material you can imagine when needed including metal bands when I had no other tools available, I've even stripped wire with it in a pinch, but I still carry a folding or retractable utility knife on a job/worksite for simply making cuts. For other tasks I grab cutters, a prybar, screwdriver, or demo tools ... whatever the job calls for.
I get it ... I love carrying and using my knives as much as anyone, but I've seen guys lose fingers or get cut so badly they needed surgeries to repair severed tendons and nerves from trying to use a knife to do jobs they aren't made for. It's just not worth it.