I tend to get confused because I see other advisors saying conflicting info on the series LLC route saying multiple LLCs are not necessary.

MF presents a tremendous opportunity leveraged across multiple doors which gives it a strong upside if you have the know how and access to capital.

Multiple sub contractors with multiple separate contracts are not allowed..Repairs/Improvements must be completed by licensed contractor(s) as required by local/state municipalitiesRepairs cannot be completed by a related or interested party (i.e. relative, real estate agent, seller, broker, etc.)Borrower selects contractorContingency Reserves Minimum 10% is required.

The work might span multiple years, depending on as the funds are available.It includes siding, roofing, balcony and patio and paving.Does anyone have any recommendations for HOA contractors?

There is a cost to LLCs; state annual fees, bank fees, accounting fees, and simply the cost of the time to operate multiple LLCs. 

In the past I have usually held only one client at a time, in 2019 it is my hope to grow and take on multiple clients in order to make this side job a career.

I have multiple investor and realtor clients that I help with projects.

Yes I don't think I would get a good start using my 15k, but it could be use by multiple partners to purchase a single or multiple family homes flip since its quick.

Based on your comments above, it looks to me that you are advocating for bad service for everyone but the multiple property owners. 

Obviously a big part of investing is working with different lenders and each one needs to run your credit (sometimes multiple time) in order to approve you for loans.