Do a complete material takeoff, price the material and apply published labor units to each nut/bolt. That will give you a total of productive man/hrs. You can't apply labor rates to those man/hrs like you do service wok either...you'll get clobbered. Add non-productive/supervisor labor, job expenses, rentals, subs (fire alrm, etc), quotes (fix/gear, etc) come up with your total COST...ad OH&P
If the owner is supplying fixtures/gear....walk away
If the owner is supplying fixtures/gear....walk away