Are you asking for pricing on repairs or replacement?

Just guess how long it will take you, add no less than 10% to that number. Multiple by your hourly rate. Add on the materials. Add on some profit and done.

On commercial jobs like these (expecially repairs), I ALWAYS ask their budget. I might give them a price to do it right and they can't afford it and just want temporary patches. It saves alot of trouble asking the budget up front. If they don't want to give it up, I explain "Look I can give you a rolls royce repair job or a honda repair job. Both are repairs but the rolls royce repair job might cost $20k and the honda repair job $2k. Can you at least tell me in which direction you are leaning? Give me a range of what you're willing to spend. I don't want to spend a few hours of my time pricing up something you can't afford."

Furthermore, on a government job, you may be required to pay prevailing wage.

Anti, it's been my experience that is only true on new construction, large remodels, or in major urban areas. Most of the villages and suburbs around here don't require prevailing wage. But yes, you could be right.

When replacing lot of 1 x's I almost always put 3/4 plywood back in... stronger and less expensive when doing larger sections.