They needed to sell after just 6 months of owning.

And only if you invest in the following 6 months after you join. 

Depending on how close I was to having 20% equity in the property and being able to avoid PMI, I’d consider using some of my cash to pay down the mortgage when I refinanced.

As @Ke Nan Wang said you have to hire an architect to make these decisions for you.On my projects I will compile like 5-10 inspiration photos based on projects I've done in the past, comps, and photos I find online, then I'll present those to the draftsman/architect.

They have to order it.

The house next door to this one is for sale also, so going to see how fast I can save up to buy it also.

I Am currently in the finishing stages of building my own house in Ontario, Canada and looking to sell and relocate to texas (likely DFW area)i have done 90% of the work on this project by myself so im confident in my ability to do any and all repairs on the property. 

Looking to connect with people in the Boston area!

It may pencil out if you're building an extra unit, but just a single bedroom is not going to work.

Dallas has to be meetup central.Two I like are NTAREI that normally meets on Thursdays maybe 1-2 times a month.