Vacancy Reserves Brrrr

Vacancy Reserves: The 8% Assumption and the BRRRR Method

Two distinct topics that every small-scale real estate investor encounters belong together in a single discussion: how to budget for the inevitable periods when your rental sits empty, and the acquisition strategy that can build a rental portfolio without infinite fresh capital. Both involve honest financial modeling—underwriting a property correctly by including what will definitely go wrong, and understanding how the BRRRR method creates returns that straight purchases don't.

VACANCY RESERVES: WHY 8% IS THE STARTING ASSUMPTION

A vacancy rate of 8% means the property is empty for approximately 29 days per year—or equivalently, one year out of every 12.5 years of ownership. This seems high. For properties in strong rental markets with reliable tenants, actual vacancy may run far lower.

But underwriting at 8% vacancy is a conservative baseline that accounts for two distinct types of vacancy:

Physical vacancy: Actual time when the unit is unoccupied. A tenant gives notice; you have 30 days to find a replacement. Even with a market-rate unit in good condition, a 30-day turnover vacancy is common. Multiply by one to two tenant turnovers per 2-year lease cycle and the annual vacancy equivalent adds up.

Economic vacancy: Rent concessions that effectively reduce collected revenue below market. One month free on a 12-month lease is an 8.3% effective vacancy. Rent holdbacks while a maintenance issue is resolved are another form.

In hot rental markets with low vacancy rates, your actual experience may be 3% to 5%. In softer markets or with difficult tenants, it might be 10% to 15%. The 8% assumption builds in a buffer—it accepts that the model will overestimate costs (you'll do better than budgeted), rather than underestimate them (you'll be consistently surprised by losses).

WHAT VACANCY TRULY COSTS

Vacancy is more expensive than the rent lost during the vacant period. Associated costs during turnover:

Cleaning and paint: $800 to $2,500 depending on the unit's condition after the departing tenant. Carpet cleaning or replacement: $500 to $3,500 depending on condition and square footage. Minor repairs and touch-up: $500 to $2,000 for typical tenant-caused wear. Re-keying locks: $150 to $300. Advertising and listing costs: $0 to $500 (many platforms are free, but professional photography helps). Property manager re-leasing fee: 50% to 100% of one month's rent if using a manager.

A total turnover cost of $2,000 to $5,000 is common even without any major renovation. On an $1,800/month rental with 30 days of actual vacancy ($1,800 lost) and $3,000 in turnover costs, a single turnover costs $4,800—equivalent to 2.67 months of gross rent. If turnovers happen every two years, the annual vacancy cost equivalent is $2,400—or 11% of gross rent.

This is why the 8% vacancy assumption, while conservative for actual empty days, often understates the true cost of tenant turnover when turnover costs are included. Some investors use 10% to 12% as a more comprehensive allowance for both vacancy and turnover costs.

THE CAPITAL EXPENDITURE RESERVE: EQUALLY IMPORTANT

Beyond vacancy, the other reserve that's frequently underestimated is the capital expenditure (CapEx) reserve—money set aside for major, non-routine replacements that are predictable over the ownership horizon but unpredictable in timing: roof, HVAC, water heater, appliances, flooring, exterior paint.

The 1% of property value rule is a common starting estimate:

$250,000 property × 1% = $2,500 per year in CapEx reserve.

For older properties, this is often too low. A property built in 1985 with original plumbing, electrical panel, and HVAC system may require significantly more in capital expenditures over the next decade.

A more sophisticated approach is component analysis:

HVAC system (remaining useful life: 5 years, replacement cost: $6,000): $6,000 ÷ 5 = $1,200/year Roof (remaining useful life: 12 years, replacement cost: $12,000): $12,000 ÷ 12 = $1,000/year Water heater (remaining useful life: 4 years, replacement cost: $1,200): $1,200 ÷ 4 = $300/year

Appliances (replacement cost: $3,000 over 10 years): $300/year

Total annual CapEx reserve: $2,800/year

This CapEx reserve doesn't reduce return—it predicts it accurately. Investors who fail to budget for CapEx show strong cash-on-cash returns until the HVAC fails and consumes several years of cash flow in one repair cycle.

THE BRRRR METHOD: BUY, REHAB, RENT, REFINANCE, REPEAT

The BRRRR strategy is an acquisition technique that allows investors to recycle their initial capital across multiple properties—potentially building a portfolio with a single initial capital base rather than requiring fresh down payment capital for each new property.

The five-step sequence:

Step 1 — BUY: Purchase a distressed or below-market property with cash or short-term financing (hard money loan). The property must be purchased at a price that allows profitable rehab and leaves sufficient equity after the refinance in step 4.

Successful BRRRR requires buying at a significant discount to after-repair value (ARV). Typical target: purchase price + rehab cost ≤ 75% of ARV. This leaves 25% equity after the project, enabling a cash-out refinance that recovers the invested capital.

Step 2 — REHAB: Renovate the property to rental-ready condition. The rehab must be managed carefully—cost overruns and timeline delays erode the equity that makes the model work. Experienced investors maintain a 15% to 20% contingency buffer on renovation budgets.

Step 3 — RENT: Lease the property to a qualified tenant. The property must be fully operational and cash-flowing before the refinance in step 4—most lenders require 6 months of rental history for investment property refinances.

Step 4 — REFINANCE: Obtain a cash-out refinance based on the property's appraised value (ARV) after renovation. Most investment property lenders allow cash-out refinance up to 75% of appraised value.

The math that makes BRRRR work:

Purchase price: $120,000 Rehab cost: $40,000 Total invested: $160,000 ARV (after renovation): $230,000

75% of ARV: $172,500

The investor can refinance at $172,500—recovering $12,500 more than was invested. The "infinite return" scenario where all or more than all invested capital is recovered through the refinance is the idealized BRRRR outcome.

More commonly, some capital remains in the deal:

75% of ARV: $172,500 Total invested: $160,000 Capital remaining in the deal: $172,500 − $160,000 = $12,500 equity retained that wasn't recovered through refinance

The $12,500 remaining in the deal doesn't get recycled to the next project—but $147,500 of the original $160,000 is recovered and available for the next acquisition. The investor has substantially reduced the capital tied up in each property.

Step 5 — REPEAT: Use the recovered capital to fund the next BRRRR acquisition. In the idealized case, the same capital base funds multiple properties; in realistic cases, it funds acquisition of the next property at a lower additional capital requirement.

WHERE THE BRRRR FAILS

The BRRRR strategy fails when:

The ARV doesn't appraise as expected: Appraisals are professional opinions, not guaranteed outcomes. If the appraiser values the property at $200,000 instead of the expected $230,000, the refinance proceeds fall short and more capital is locked into the deal.

Rehab costs exceed budget: Every $10,000 in cost overrun reduces the equity available for the refinance. Projects that run over budget by 30% often fail to achieve the equity targets the model required.

The property doesn't rent at projected rates: A refinanced property with below-projected rent may not cash-flow adequately to service the new, higher refinanced mortgage (which may be larger than the original purchase-money mortgage).

The property is difficult to appraise: Unique properties, rural properties, or properties in markets with few comparable sales may receive conservative appraisals that don't reflect the true market value after renovation.

Hard money carrying costs: Short-term financing (hard money) charges 10% to 15% annualized plus origination points. A 6-month rehab period financed with hard money at 12% on $160,000 adds $9,600 in interest costs to the project—costs that must be absorbed by the equity created through the rehab.

The BRRRR method is not a way to build a portfolio with no capital—it's a way to build a portfolio with less capital per property than a straight purchase requires, by manufacturing equity through renovation rather than bringing equity through a cash down payment. The manufacturing process involves significant execution risk that straight purchases don't.

Together, accurate vacancy reserves and the BRRRR strategy represent two sides of real estate investing discipline: one is the honest budgeting of what will go wrong during operation; the other is the acquisition strategy that creates opportunity even in markets where straight purchases don't pencil. Both require the same fundamental skill—running the real numbers, honestly, before committing capital.