Question 1

What is house hacking?

Accepted Answer

House hacking means buying a property, living in part of it, and renting out the rest to offset your mortgage. Common strategies include renting a spare bedroom, converting a garage to an ADU, or buying a duplex and living in one unit while renting the other. Done well, you can live for free or nearly free while building equity.

Question 2

Is house hacking legal?

Accepted Answer

Yes — but check local zoning laws, HOA rules if applicable, and short-term rental regulations in your city. Renting a room in your primary residence is legal in virtually every jurisdiction. ADU regulations vary by city and county. Short-term rentals (Airbnb) are regulated differently and some cities restrict them heavily.

Question 3

How much can I make house hacking?

Accepted Answer

Depends heavily on your market and strategy. Renting a room: $500–1,500/mo. ADU or basement apartment: $800–2,000/mo. Duplex unit: $1,500–4,000/mo. In high cost-of-living cities, a well-executed house hack can cover 50–100% of your mortgage payment.

Question 4

Does rental income count toward mortgage qualification?

Accepted Answer

For a duplex, triplex, or fourplex — yes, lenders typically count 75% of expected rental income toward your qualifying income. For a single-family home where you rent a room, most conventional lenders do not count that income for qualification. FHA loans on 2–4 unit properties allow rental income counting.

Question 5

What is cash-on-cash return in house hacking?

Accepted Answer

Cash-on-cash return measures your annual net rental income divided by your total cash invested (down payment + closing costs). A $50,000 down payment generating $6,000/year net rental income = 12% cash-on-cash return. Most real estate investors target 8–12%.

Question 6

Can I house hack with an FHA loan?

Accepted Answer

Yes. FHA loans allow as little as 3.5% down on a 2–4 unit property if you live in one unit as your primary residence. That makes a duplex or fourplex one of the lowest-cash ways to start. You must occupy the property, typically for at least one year, and the property must meet FHA condition standards.

Question 7

How do I calculate house hacking returns?

Accepted Answer

Add up your monthly rental income, subtract the mortgage payment, taxes, insurance, maintenance, and a vacancy allowance (often 5–10%), then multiply by 12 for annual net income. Divide that by your total cash invested (down payment plus closing costs) to get cash-on-cash return. The calculator above does this for you.

Question 8

How much down payment do I need to house hack?

Accepted Answer

As little as 3.5% with an FHA loan on a 2 to 4 unit property, or 0% with a VA loan if you are eligible. Conventional loans need about 5% for a duplex and 15% for a three or four unit property. You must live in one unit as your primary residence to use these owner-occupied programs.

Question 9

What is the FHA self-sufficiency test?

Accepted Answer

On a three or four unit property, FHA requires that 75% of the expected net rental income covers the full mortgage payment (principal, interest, taxes and insurance). Duplexes and single-family homes are exempt from the test.

Question 10

What are the downsides of house hacking?

Accepted Answer

Living with or near tenants reduces privacy. You become a landlord — responsible for repairs, tenant issues, and vacancy periods. Selling later may trigger depreciation recapture taxes on the rental portion. Screen tenants carefully and have a lease agreement in place from day one.

Loan	Units	Minimum down	Notes
FHA	1 to 4	3.5%	Mortgage insurance applies. 3-4 units must pass the self-sufficiency test.
VA	1 to 4	0%	Eligible veterans and service members. Funding fee applies, no PMI.
Conventional	1	3% to 5%	Rental income from a room is usually not counted toward qualifying.
Conventional	2	5%	Expected rent from the other unit can count toward qualifying.
Conventional	3 to 4	15%	Higher reserves and stricter underwriting.

Strategy	Typical extra income	Best for
Rent a spare room	$500 to $1,500 a month	Lowest cost, no construction, least privacy
ADU or basement unit	$800 to $2,000 a month	Single-family homes where zoning allows it
Duplex	$1,500 to $4,000 a month	Best income and the easiest to qualify for
Triplex or fourplex	Higher, spread across more units	Maximum offset, more landlord work

Let your tenants pay
your mortgage.

4 ways to house hack

House hacking loan options compared

How lenders count your rental income

Which house hacking strategy fits?

Example: a duplex house hack

Frequently Asked Questions

Let your tenants payyour mortgage.