Steven has his frames powdercoated by a guy , he gave me a quote of roughly £100 to do that . Burls has a good road reputation . Have you thought about adding a disc mount too ?
They're not horizontal dropouts, they're track ends
That aside, mine were done by Argos - £120 including removing gear stops, adding a stop for a V brake on the top tube (Kona frame), track ends and respray in pearlescent white. That was, erm, ten years ago though, so it might have gone up a bit since
Yes, but I'm kind of assuming that what you want are track ends (open end pointing backwards) not horizontal dropouts (open end pointing forwards). If that's not the case, I apologise for my presumption
I got some done a few years ago by a guy who just builds frames in his spare time. Very cheap - but then I did supply the track ends.
That's my main point - I sourced Paul's Comp track ends myself & would highly recommend them over any other basic track ends (ignoring sliders, EBB etc.).
They have a built-in tension screw that makes them a pleasure to use. They are also very purty and well worth the extra few bucks over what a frame builder would over-charge you for some very basic flat-plate track ends from their box of old frame fittings.
Also, many old-school track ends are intended for (surprise!) track bikes. The seat stay angles (and therefore the attachment tabs on the track ends) are very different from the angles of a MTB frame and some frame builders do a really fugly job of making everything fit together.
In the UK, you might get some Paul's track ends from HubJub or Fresh Tripe. I just emailed Paul & he shipped them directly to me. Easy.
Recently I asked half a dozen frame builders this very question and the consensus was around £100. However only about 2 said they could do it to any steel frame, the other 4 were much more cagey about whether they could do it unless they'd inspected the frame first.
As for the dropouts, its trackends you need for fixed gear/single speed applications. Horizontal dropouts are generally found nowadays on low end bikes that use clamp on rear deralliers
I don't think an extra £20 for shipping is so bad when you're already looking at >£100 to do the job with some random old track ends cut from flat plate with no adjusters.
I certainly made that money back when I sold my frame. People definitely recognized that the Pauls bits added value.
Not to mention that they got lots of compliments and were Zen-like to dial in perfect chain tension and wheel alignment after a puncture or with frozen fingers....
And if you get them brazed and smoothed into your frame, like I did, you'll instantly become a god among envious singlespeeders.