Best way to finance renovation and construction of more units?

[Michael Ndjondo makadi]

So I have purchased this fixer upper SFH using a conventional loan sitting on RM1-3 zoning here in San Diego. The plan was always to add 2 more units as permitted on top of renovating the SFH. The initial plan was to use home equity to finance the renovation and get a loan for the construction of the 2 units. I am not sure if this is the best option to go about it. Hence I was wondering if anyone with more experience has done it something similar in the past or might suggest a better option to finance both projects. Your advice is much appreciated.