House Hacking Calculator — San Diego, CA
Pre-filled with localized assumptions for San Diego. Replace the defaults with your real numbers (rent comps, taxes, insurance, repairs, and reserves) to get an accurate result.
Inputs
Results
More expensive than renting alone.
- Rental units: 3 (you live in 1)
- Rental income (gross): $6,600
- Rental income (after vacancy): $6,336
- Operating expenses: $2,130
- Mortgage payment: $5,688
- Total housing cost: $7,818
- Offset by rental income: −$4,206
- Your net cost: $3,612
- If you rented instead: $2,200/month
- House hacking cost: $3,612/month
- Monthly difference: -$1,412
Tip: FHA loans allow 3.5% down on 2-4 unit properties if you live in one. Down payment: $45,000
San Diego Local Market Note
Informational onlySan Diego consistently posts some of the lowest vacancy rates among major U.S. metros, supporting strong rents but at high entry prices. Statewide AB 1482 caps annual rent increases at 5% plus CPI (max 10%) for most buildings over 15 years old. ADU-friendly local rules have made granny-flat additions in neighborhoods like City Heights and Clairemont a leading strategy for adding rentable units.
Local context for general information — not financial, legal, or tax advice. Verify current regulations and market data before making investment decisions.
How to Use This House Hacking Calculator (Mini Guide)
Live in one unit of a 2-4 unit property and rent out the others — see how much you save vs renting and whether you can live for free (or profit). These defaults are pre-filled for San Diego, CA. Always replace them with your real numbers when you have them.
What house hacking is
Buy a duplex, triplex, or fourplex with an owner-occupant loan (3.5-5% down).
Live in one unit, rent out the others.
Rental income offsets (or eliminates) your housing cost.
Why house hacking is powerful
FHA loans allow 3.5% down on 2-4 unit properties if you live in one.
Conventional loans allow 5% down on 2-unit, 10-15% on 3-4 units.
You get investment property benefits with homeowner financing.
How to use this calculator
Enter purchase price and number of units (2, 3, or 4).
Enter rent per rental unit (not your own).
Value of your unit = what you'd pay to rent something similar.
Net cost = your total housing cost minus rental income offset.
What success looks like
Net housing cost < $500/month = you're winning.
Net housing cost ≤ $0 = you live for free.
Net housing cost < $0 (negative) = tenants pay you to live there.
Reality check
You're a landlord living next door to tenants — not for everyone.
Vacancy and maintenance are real — don't assume 0%.
Market rent matters — verify with comps, not wishful thinking.
How to use this calculator in San Diego
Start with the pre-filled assumptions for San Diego, then replace them with your deal’s numbers. If you’re an investor, keep vacancy and reserves conservative. If you’re a homeowner, pay special attention to property taxes and insurance — these often drive the rent vs buy decision.
Nearby cities in CA
Explore nearby cities to compare assumptions and outcomes.