I am in quite a dilemma as I was so set on a HELoC to fix my current residence and put down the 20% on an investment property ... hopefully having enough leftover to renovate a buy and hold triplex I've been eyeing. 

Many times these include underestimating Renovation Costs (Rehab Cost) especially worse if unexpected issues arise, improperly running the comps (Comparables) to determine the After Repair Value (ARV), or overlooking the (Holding Costs) that are paid monthly until the property is sold.

I'm currently renovating a whole duplex, with about 3 weeks of work left to do.

We've just put $100k into a huge renovation, and the house has all new kitchens and baths, hardwood floors, etc. 

We have quickly realized why the BRRR strategy is awesome for being able to scale faster.It will be some time before we have enough cash to buy a property in cash and fund rehab costs.However, with the renovations we did on our primary residence and the increases in the market, we could probably access around $100k of equity thru a HELOC.I understand the risk of having the HELOC maxed out when the market starts to decline, but what about just using it as supplemental funds for acquisition/ rehabs and then paying it mostly down after refinancing the properties..any negatives?

Between the the Mobil homes and the renovation they spent 40,000 and take in rent approximately 800 each.  

My first reaction is shock that you could buy a place for 25k, put in only 25k of renovations and the value would be 100k. 

All of the properties are turnkey (recently renovated) and have tenants with property management in place.

Pickens Hey Ben- If you could provide some details about the deal like property type, cost, cap rate, estimated renovation cost, rent, etc... can’t really answer your question without knowing any details.

If you do a major renovation on the property your local building inspector could force you to add strapping to all of your roof trusses or hand framed rafters, plus additional strapping / tie downs on load bearing and gable walls.4.