I'm a general contractor in Memphis, which means I usually meet this problem after it's already happened. Somebody calls me when the renovation is finished and asks whether there's anything we could add that would bring the appraisal up. By then the answer is almost always no, and more importantly the appraisal usually wasn't the problem at all.

The problem was the size of the loan.

Here's the mechanism, and I don't see it discussed nearly enough for a market like this one.

Most DSCR lenders have a MINIMUM LOAN AMOUNT. Commonly somewhere in the seventy-five to one-hundred-thousand-dollar range, though it varies a lot by lender. That number has nothing to do with you, your credit, the rent, or how good the renovation is. It's a floor, because a small loan costs them nearly the same to originate and service as a large one.

Now put that against the arithmetic of a cheap-market BRRRR.

Say you buy at 55, put 35 into it, and you're all-in at 90. Your finished value comes in at 125 and the lender goes to 75 percent of that. Seventy-five percent of 125 is about 94. You clear the floor, you pull your money back, the strategy works exactly as advertised.

Now run the same deal on a street where the finished value is 100 instead of 125. Seventy-five percent of 100 is 75. Depending on your lender you are now at or under the minimum, and if you're under it there is no refinance at any interest rate. Not an expensive refinance. No refinance. The exit you built the whole plan around does not exist, and you find this out after the money is spent.

What makes this specifically a cheap-market trap is the thing I say constantly from the construction side: renovation cost is close to FLAT across a city. A roof is a roof, a panel is a panel, a repipe is a repipe, whether the house sits in Frayser or in Germantown. The finished value is not flat at all. So the cheapest zips give you the smallest spread between cost and value AND the smallest loan at the end. Both problems get worse together, which is why the bottom of this market punishes people who did everything else right.

The fix costs one phone call and it has to happen before you buy anything, not after.

Talk to the DSCR lender FIRST, before the hard money lender, and get four things in writing. The minimum loan amount. The seasoning period. Any minimum property value or square footage. And the condition requirements at the time of refinance.

Then work backwards. If your lender's floor is 80 and they go to 75 percent, your minimum finished value is about 107. That number is now a hard filter on which streets you can even shop, and it's a far more useful filter than any of the usual rules of thumb, because it's specific to your actual exit rather than to somebody's blog post.

Also worth knowing: lenders differ enormously on this. If your deal is just under one lender's floor, another may write it. It's worth asking three rather than assuming the first answer is the market.

The honest counterweight, because this isn't an argument against cheap houses.

If you're buying with cash, or using a portfolio lender or a local bank that holds the loan, this constraint may not apply to you at all, and those buyers can go places the DSCR crowd can't. And leaving some money in a deal is not a failure. A house that cash flows with twelve thousand dollars left in it is a perfectly good outcome and frequently a safer one than the version where you pulled everything out and have no reserve for the first winter.

The failure is only when the exit you planned turns out not to be available, because then you're making the decision under pressure instead of in advance.

Curious what minimums people are actually seeing right now, and from which kinds of lenders. I'd also be interested to hear from anyone who hit this floor and what they did about it, because the workarounds are the part I know least about. I only see these houses from the inside.

Full disclosure as always: I run a construction company here, so I have an obvious interest in people renovating houses in Memphis. This post argues for checking something that occasionally stops a renovation from happening at all.