...snipped.. especially if the fix is already something you have a flat fee for?...snipped..
What does that mean? Do you charge a flat fee for onsite work? If so, that may be why you're asking this question.
And if your flat rate for certain things isn't less than what your hourly rate would be, then go ahead and charge a flat rate. The main thing is not to short change yourself, nor allow your client to think for a moment that your time/effort is less valuable simply because it's being provided remotely.
Here's why I charge hourly for remote work, rather than a flat fee (which is what I charge for bench work):
- Remote work is virtual onsite work. I charge hourly for onsite work, so why wouldn't I for remote work?
- The customer is still looking over your shoulder (even if you can't tell it's happening)
- If your customer stays on the phone, you still have to educate, entertain, and endure that enforced human interaction with a virtual stranger. There should definitely be a charge for that.
- You still have to concentrate/dedicate your time to this one customer. Sure it's a
little more flexible than a real onsite, but not nearly as flexible as bench work. If you can't multitask your time, you should be compensated accordingly.
- You're more susceptible to "one more thing . . ." because the customer is often more intimately involved. Like an onsite.
Personally, my remote and my onsite hourly rates are identical. Including the same one hour minimum charge. Some customers might expect a break for remote service rather than onsite. After all, you don't have to drive there! But in my mind, BOTH the customer & I benefit from remote service. Sure, I don't have to drive, but the customer also doesn't have to put up with a stranger sitting in their office/bedroom/living room/dining room/kitchen/garage for any amount of time. So we both get to be a little more comfortable and relaxed in our own (separate) surroundings. Apart from that, onsites and remotes are basically identical in requirements so I'm fine with billing accordingly.