Have done plenty of this. Its replacement value for that frame. If it was Columbus SL you need a quote for Columbus SL frame, if he’s got insurance he isn’t the one paying it. The insurance company is.
just go to a bike shop, explain what the frame is, components, etc, what you think is equivalent. they should be able to provide a proper quote (and at aus bike store prices, which will be more than what someone is flogging it for on Gumtree/ebay). if you don’t like the quote, you don’t have to use it.
also be sure to get quotes for everything, like clothes that were wrecked
you would normally go like-for-like.
so an SL frame of similar vintage and quality.
next would be similar tubeset of similar vintage and quality.
finally, get a quote for a new frame built with similar tubeset
If you want quick and painless, just pick an off the rack you like that is similar spec and use that. a steel Gios???
A frame builder would just confuse the issue… can it be repaired? don’t even worry about it. But don’t sign off your salvage rights though.
Took nearly 2 years to get 2k monies out of biatch ( who worked for beactive!!) that hit my GT tarck. She wanted it sent to a frame builder for repairs and i said Fuck off.
Judge threw out my claim for clothing, but not the helmet claim. YMMV