BRRRR is buy, rehab, rent, refinance, repeat. The strategy is well known. The part that decides whether it works is that it requires two different loans from two different products, and they have to agree with each other.

Most failed BRRRRs are not failures of the renovation. They are files where the exit loan was never checked against the entry loan until the money was already spent.

The two loans

The bridge. Short term, asset based, funding purchase and rehab together. It is priced for speed and flexibility rather than cost, so it is expensive to hold. Rehab is typically released in draws against completed work. My own bridge runs 9% to 15% depending on credit and experience.

The refinance. Long term, thirty year amortising, usually a DSCR loan because the property is a rental and underwriting it on its own income is simpler than on yours. This pays off the bridge.

The whole strategy lives or dies on one question: does the refinance produce enough to retire the bridge and return your capital?

Working the arithmetic backwards

Start from the refinance, because that is the constraint.

Take the expected appraised value once rented. Multiply by the refinance LTV, commonly 70% to 75%. That product is the largest loan you can expect.

Now add up everything you will have in the deal: purchase price, rehab, closing on the purchase, points and interest on the bridge across the full hold, carrying costs while renovating and leasing, and closing on the refinance.

If the refinance is larger than the total, you recover all of your capital. If it is smaller, the difference is cash left in the property.

A worked version. Finished value $240,000 with a 75% refinance is $180,000. All in: $130,000 purchase, $45,000 rehab, roughly $12,000 of financing and closing across both loans, call it $187,000. The refinance returns $180,000 and $7,000 stays in the deal.

That is a perfectly good outcome. It is simply not the "infinite return" version of BRRRR, and knowing which one you are running before you buy is the entire point of doing this arithmetic first.

Where BRRRRs actually break

Seasoning

Many lenders will not lend against the new appraised value until you have owned the property for a set period. Three to twelve months is the common range. Before seasoning is met, the loan is based on your purchase price, which defeats the strategy completely.

This is the single most expensive detail to discover late, because every month of waiting is another month of bridge interest. Confirm the seasoning requirement with the refinance lender before you buy.

The appraisal

Your ARV was an estimate. The appraisal is the one that counts, and it arrives after the money is spent.

Everything in calculating ARV honestly applies with more force here, because in a flip a soft appraisal costs you profit while in a BRRRR it strands your capital.

DSCR capping the loan before LTV does

This surprises people who only planned around LTV.

A property may appraise at $240,000 and support $180,000 at 75%. But if rent is $1,700 and the payment at $180,000 comes to $1,600, the DSCR is about 1.06. A lender wanting 1.20 will reduce the loan until the ratio clears, not until the LTV does.

Both tests apply. The loan is the lower of the two.

Vacancy at the wrong moment

Most refinances want the property leased, or will use market rent with a haircut. A finished property sitting empty is carrying bridge interest at bridge rates while producing nothing. Start marketing the unit before the work is complete.

Rehab overruns

The bridge funds a budgeted scope. Overruns come out of your pocket and increase the all in number that the refinance has to cover, which reduces the capital you get back twice over.

A workable sequence

  1. Identify the property and estimate ARV from comparable sales.
  2. Estimate market rent independently, because DSCR will test it.
  3. Confirm the refinance lender's LTV, DSCR minimum, and seasoning period. Before buying.
  4. Compute the maximum refinance as the lower of the LTV test and the DSCR test.
  5. Budget the rehab with a contingency of at least 10%.
  6. Total your all in cost including both loans' financing and closing.
  7. Compare. Decide whether the capital left in the deal is acceptable.
  8. Only then make the offer.

The BRRRR calculator runs steps four through seven together, holding bridge terms, refinance LTV, rate, and operating expenses in one place so you can see which of the two tests is actually binding.

The honest version

BRRRR is a way to recycle capital, and sometimes to recycle all of it. Treating full recovery as the definition of success is what pushes investors into optimistic ARVs and thin contingencies.

A deal that returns 80% of your capital and leaves a performing rental behind is a good deal. Run the arithmetic before you buy and you get to make that judgement deliberately, rather than discovering it at the refinance.

When the numbers work, send the deal over.