As many have said: They make bodies and necks and do excellent work. Not cheap - but really good.
I have done MANY Warmoth builds over the years - and here's a few things that I have learned:
- Their standard bass necks are a bit chunky. Happily, they now offer a "Slim profile" for a minor up-charge.
- Their standard bass necks are rather heavy. I suspect this is due to the steel strengthening rods they use. Again, for an up-charge, you can get graphite (SO worth it!)
- It's best to decide what you think you want prior to visiting their web site. Get an idea in your head, maybe put it in spreadsheet. In my recent case, I decided that I wanted to build have bass with the following characteristics:
- Jazz bass profile (body / neck)
- Maple fretboard w/MoP blocks - ala '70s J-basses
- BLUE. It had to be, in some way, blue.
- Pickups would not be standard J's but Nordstrand Big Singles (I had those on my Fodera and loved the sound)
- Light. It could not be a back-breaker.
So once I had these things jotted down, I went to the Warmoth page. Knowing that they offer a discount for items they have in stock, I searched the in-stock selection of J necks and J bodies - nothing matched what I wanted so I proceeded pick out what I wanted. I had some questions on the body, so I called them and, working with a very nice fellow whose name escapes me, I ordered a Dinky J body, Alder, Painted "Spectra Blue" (dark blue with some metal-flake). I could have gotten a fancy top & cool finish, but that would have added cost and really wasn't what I wanted for this bass. The "Dinky" J body is a bit smaller than the classic Fender J - thus a bit lighter.
I thought I had a good neck for it (bought used) but that didn't pan out, so I later ordered my neck - J neck - flame maple (I decided to splurge), THIN profile, Graphite rods, drilled for Hipshot Ultralights (I happened to have a set), clear satin finish.
That cost me right around $1K for the body and neck. Yeah, I know - not cheap - but really well made.
I'm having a local fellow do all the rest - I told him wanted two Nordstrand Big Singles and a John East 3 band classic J preamp. He's making that happen even as I speak. I hope to have the bass by end of week or so. Total cost will be around $1500 - like a new Fender but *much* nicer.
So if you are on more of a budget and okay with a more Passive bass - and let's say you want a PJ of some sort, with an Ebony fretboard. Okay - so you go to the page, and see what they have in stock for bodies and necks - save some money that way - Get some good Duncan, EMG or DiMarzio PJs, Gotoh tuners & bridge and you're off to the races!
One thing I also suggest is don't buy an unfinished body. Why? Because they do a GREAT job of finishing them, and it's a total hassle. You can buy an unfinished neck and then tru-oil or tung-oil it later, but get a finished body. You'll be happy you did.
Good luck.