This calculator that @Burj74 linked is a good starting point.
BUT take its estimates with a grain of salt. It never factors in weather delays (which you should price into everything IMO), water access, and not to mention in your case access to the site in general.
Insurance costs get factored into pricing and one recent job we bid just hit us all up and they want us to price in a “failure to complete” bond and resend the estimate. I walked away because our calendar is packed and I don’t think we’ll be able to finish when they want it finished anyhow.
Asking for pricing advice is good for a general baseline, but I dont personally price anything on sq. Footage.
I know what my cost is to run the business per hour and per day along with daily and monthly profit goals so we price everything using that.
Pricing per sq foot for the long list of surfaces, water access, PITA factor, and profit goals are hard jive with square foot price.