ADU project I talked myself out of three times finally closed and the unit rented in nine days

The four months of second-guessing cost you roughly $1,000 and you already knew the comps were right.

The assumption doing the most work in that hesitation was discounting a verified comp by $250 to hedge against your own research. You had a permitted unit with a CO already in hand, which eliminates the single biggest risk in this strategy: entitlement. Permitting and construction risk are where ADU deals actually fall apart, and you were looking at a deal where someone else had already absorbed both.

The $1,200 pencil made sense as a conservative underwrite on a project-stage ADU where the CO is speculative. It does not make sense applied to a tenanted-ready unit in a market where your own comp pull showed $1,450 to $1,600 sitting. The two scenarios carry different risk profiles and deserve different rent assumptions.

The risk you did not name: your $3,550 combined rent on a $334,000 acquisition is a healthy gross yield for South Jersey, but I'd want to know how you stress-tested vacancy on the main house specifically. ADU tenants in the 480-square-foot range tend to have shorter average tenancy than primary unit tenants, so the ADU vacancy assumption matters less than the main house assumption for hold-period modeling. If the main house sits for two months between tenants you give back most of a year's ADU income premium.

The broader pattern here is worth naming plainly. You had real numbers, a de-risked asset, and thin inventory that compressed your time to act, and you added four months of fictional permutation on top of that. The deal didn't change. Your read of your own work changed, and it changed in the wrong direction.

One thing worth building before the next LOI: a written rule for when a comp pull is good enough to hold. What would that threshold have looked like on this deal?

Congratulations on closing and getting that unit leased so fast. What you described at the end is worth naming clearly because it will come up again.

You had verified numbers. The comps said $1,450 to $1,600. You penciled $1,200 anyway, and the reason was not the data, it was doubt in your own analysis. That is a different problem than bad underwriting, and it is a much harder one to fix, because better data does not solve it.

The thing that made this deal lower risk than most ADU projects is the one you already named: the permit was done and the certificate of occupancy (CO) was in hand. A CO is the local government's written confirmation that the structure was built to code and is legal to occupy. Without it, an ADU is not legally rentable in most jurisdictions, and lenders often will not finance the property with it. Buying one with both documents already cleared removes the two longest and most expensive parts of the timeline, permitting and construction, before you spend a dollar.

Your $1,200 pencil versus $1,450 actual works out to $250 a month, which over your four-month hesitation period was $1,000 left uncollected. That is a useful way to put a concrete number on decision drag, and it is worth keeping in mind the next time a verified comp is sitting in front of you.

I will say, I cannot tell you what future deals will do from this one data point, and nothing here should read as a return projection.

What is the framework you use when you pull comps? Knowing whether you went off active listings, closed leases, or a mix of both would tell me whether the $1,200 number was a data problem or purely a confidence problem.