What Is Cost Per Unit?
Cost Per Unit = (Purchase Price + Closing Costs + Rehab Costs) ÷ Number of Units. A $900,000 12-unit with $36,000 in closing costs and $84,000 in rehab = $1,020,000 ÷ 12 = $85,000 per unit. This differs from cost per door, which uses purchase price only. The national average price per unit for multifamily transactions hit roughly $213,000 in mid-2025—but that's sticker price. After closing and rehab, all-in cost per unit runs 5–20% higher depending on condition. Use cost per unit to compare value-add deals where rehab spend varies widely.
Cost per unit is the total acquisition cost—purchase price plus closing costs plus rehab—divided by the number of units. It captures what you actually pay per unit, not just the sticker price.
At a Glance
- What it is: Total acquisition cost (price + closing + rehab) ÷ unit count
- Key difference: Cost per door = purchase price only; cost per unit = all-in
- National average: ~$213,000/unit sticker price as of mid-2025; all-in runs higher
- Best for: Value-add deals where rehab budgets differ significantly across comps
Cost Per Unit = Total Acquisition Cost / Number of Units
How It Works
The full picture. Cost per door tells you the sticker price per unit—useful for screening. Cost per unit goes further: it includes every dollar you spend to acquire and stabilize the property. That means purchase price, closing costs (typically 3–5% of purchase price for multifamily), and any planned rehab costs.
Why it matters for value-add. Two 10-unit buildings both list at $1M ($100,000/door). Building A is stabilized—close it, rent it. Building B needs $200,000 in renovations. Cost per door says they're identical. Cost per unit says $100,000 vs. $125,000. That $25,000/unit gap is real money—$250,000 total—that affects your cap rate, cash-on-cash return, and financing needs.
What to include. Purchase price. Closing costs (lender fees, title, appraisal, attorney, transfer taxes). Rehab budget (deferred maintenance, unit turns, capital improvements). Some investors also include acquisition financing costs (loan origination fees, points). Don't include ongoing operating expenses—those flow through NOI.
Market benchmarks (2025). Phoenix averaged ~$297,000/unit, Chicago ~$252,000/unit (up 20% year-over-year), Denver ~$290,000/unit, and Atlanta ~$174,500/unit. These are sticker prices. Add 5–15% for all-in cost per unit depending on property condition and closing complexity.
Real-World Example
Indianapolis value-add comparison. You're evaluating two 16-unit apartment buildings in the same submarket.
Building A: Listed at $1,280,000. Stabilized, 94% occupied, recently renovated. Closing costs: $51,200 (4%). No rehab needed. All-in cost per unit: ($1,280,000 + $51,200) ÷ 16 = $83,200/unit. Current NOI: $102,400. Cap rate: 7.7%.
Building B: Listed at $960,000. 75% occupied, deferred maintenance, dated units. Closing costs: $38,400 (4%). Rehab budget: $240,000 ($15,000/unit for new kitchens, flooring, HVAC). All-in cost per unit: ($960,000 + $38,400 + $240,000) ÷ 16 = $77,400/unit. Current NOI: $57,600 (depressed by vacancy). Projected stabilized NOI after rehab: $115,200. Projected cap rate on all-in cost: 9.3%.
Cost per door says $80,000 vs. $60,000—Building B looks much cheaper. Cost per unit narrows the gap to $83,200 vs. $77,400. But the real story is the projected cap rate: 7.7% vs. 9.3%. Building B wins on returns if you can execute the rehab on budget.
Pros & Cons
- Captures true investment basis—not just sticker price
- Apples-to-apples comparison for value-add deals with different rehab scopes
- Helps underwrite realistic cap rates and cash-on-cash returns
- Forces you to budget closing costs and rehab before you make an offer
- Requires estimating rehab costs—easy to get wrong on older properties
- Closing costs vary by state, lender, and deal structure—hard to standardize
- Doesn't capture operating expenses or management costs
- Can inflate perceived cost if rehab is value-creating (forced appreciation)
Watch Out
- Rehab cost overruns: A $15,000/unit rehab budget that becomes $22,000/unit changes your cost per unit by $7,000—and your return projections along with it. Build in 10–15% contingency.
- Closing cost variation: Commercial multifamily closing costs range 3–5% of purchase price. A $2M deal could have $60K or $100K in closing costs depending on lender fees, transfer taxes, and attorney costs. Get real quotes before underwriting.
- Don't compare across markets: A $75,000/unit all-in cost in Memphis and a $250,000/unit in Denver aren't comparable. Use cost per unit within the same submarket and asset class.
- Ignoring income: Two properties at $85,000/unit can have wildly different NOI. Always pair cost per unit with cap rate or gross rent multiplier.
Ask an Investor
The Takeaway
Cost per unit = (Purchase Price + Closing Costs + Rehab) ÷ Units. It's the all-in version of cost per door and the better metric for value-add deals where rehab budgets differ. National averages ran ~$213,000/unit sticker in 2025, but your all-in number is always higher. Use it to compare deals in the same market, but always pair it with cap rate and NOI to understand returns.