Dont know how its done in Cali, but if they did a good job of fireblocking then it may be a pain to pull wires. Cutting wires at top and bottom plate and through studs could be very time consuming. If you could simply cut behing the switches/outlets, then pull from the panel it may be alright. Or if you could cut in the middle (in attic or basement/crawl space) might make it easier. 450 sq ft is not very big and I hope the return pays off for the work involved. Personally I wouldnt pay for it AND do the work unless it was a ton of wire. As a contractor I wouldnt want someone on my jobsite that might either slow me down or not have proper insurance coverage.
edit: Wanted to add one more thought. If you had the time, I would lowball the guy and take the work. Pay close attention to what you get into and work involved so that you can know what to bid on other similar jobs. If it doesnt pay, then at least you find out with a small job and not take a big loss. The education you receive might make it worth it.
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