looks like my reply got lost in the eather,
As far as discounting from residential, one should look at what the added expences are for a client who you visit once every few years and one you will visit several times in one year.
Where are the cost savings, or are you dropping the price just to get work?
can you bill it as you go or is it all due on final completion? Large jobs can cause cashflow problems for micro companies.
do you have a single contact/boss for the job, or are you going to have to listen to several people onm the baord or whatever?
There should not be any hard and fast rule for bidding work, other then you are bale to make expences and show a profit (do you pay yourself beforte profit? some people dont!?!?!?)
What are the benefits to working on this project, is there high visibility for your truck/logo/phone number?
The question you need to ask yoursdelf is what will I be getting from reducing my price and how much I want to do the job.
Sometimes a marginal profit cna work for you in the long run.