House Hacking: How I Bought a Duplex and Let My Tenant Help Pay My Mortgage

When people hear “real estate investing,” they usually picture someone with a massive portfolio, a pile of cash, and ten rental properties.

That’s not where you have to start.

Sometimes, real estate investing looks like buying the home you’re going to live in anyway — and choosing one that can also produce income.

That’s exactly what I did.

I bought a duplex in University Place, Washington, moved into one side, and rented out the other. Now, instead of carrying the entire cost of my home by myself, I have rental income coming in every month to offset a significant portion of my mortgage.

That strategy is called house hacking, and for the right buyer, it can completely change the math of homeownership.

What Is House Hacking?

House hacking is pretty simple: you own a property, live in part of it, and generate income from another part of it.

That could mean buying:

• A duplex and living in one unit while renting the other

• A triplex or fourplex and renting the additional units

• A home with an ADU

• A property with a finished basement or separate living space

• A house where you rent out individual bedrooms

You’re combining your primary residence with an income-producing property.

And no, you do not necessarily have to think of yourself as some hardcore “real estate investor” to do it.

You can just be someone who looks at a $4,000 mortgage and thinks, Okay…but what if somebody else paid $2,000 of that? 😂

That’s essentially where the magic starts.

My House-Hacking Story in University Place

I bought my duplex in University Place in December 2025.

I live in one unit, and the other unit is rented for around $2,800 per month, including water and sewer.

My mortgage is approximately $4,841 per month.

That means the rent from the other side covers more than half of my monthly mortgage payment before considering other property expenses.

And I still get to live in my own home.

That’s the part of house hacking I think people sometimes miss.

I wasn't just looking at the property and asking:

“Can I afford this mortgage?”

I was looking at the entire property and asking:

“What does owning this property actually cost me after the income it produces?”

Those are two VERY different questions.

Why I Love House Hacking

One of the biggest reasons I love this strategy is that you're making your housing work harder for you.

Most of us are going to have a housing expense regardless. You're either paying rent or paying a mortgage.

With house hacking, you're asking whether part of that housing expense can be offset by an asset you own.

At the same time, you're building equity in the property as you make mortgage payments and potentially benefiting if the property appreciates over the long term.

It can also be a way to start learning about real estate investing while you're still living at the property.

You're learning what it's like to screen tenants, maintain a rental, budget for repairs, understand leases, track expenses, and manage a property — without necessarily jumping straight into buying a separate investment property.

You Don't Have to Buy a Duplex

This is probably one of the biggest misconceptions I hear.

People think house hacking automatically means buying a duplex.

It doesn't.

A cute Craftsman with a basement apartment?

House hack.

A home with a detached ADU in the backyard?

House hack.

A triplex where you live in the cutest unit and rent the other two?

House hack.

A house where you rent a bedroom to a friend?

Also a version of house hacking.

Personally, I love looking for properties where the additional living space still allows you to have some separation and privacy.

Because passive-ish income is great.

Sharing a refrigerator with Chad from Craigslist?

Maybe less great. 😂

House Hacking Can Make Expensive Markets Feel Different

This is particularly interesting in markets like Tacoma and University Place, where buyers can look at the monthly payment on a home and immediately feel discouraged.

Instead of only searching for a traditional single-family home, I sometimes encourage buyers who are open to the idea to look at properties differently.

Could there be a second unit?

Could an ADU generate income?

Is there an already-established duplex?

Could a basement eventually become a separate living space?

Could you buy a small multifamily property instead of a traditional single-family home?

That doesn't mean every property with “rental potential” is automatically a good investment.

You still have to run the numbers.

The Numbers Matter

This is where I want buyers to slow down.

Don't buy a duplex simply because someone tells you, “The tenant will pay your mortgage!”

You need to understand the actual expenses.

Look at the realistic market rent for the additional unit. Then consider your mortgage payment, taxes, insurance, utilities you're responsible for, repairs, maintenance, vacancy, capital expenditures and other ownership costs.

You also need to understand the condition of the property.

A property bringing in $2,500 a month isn't nearly as exciting if you're about to replace a roof, sewer line and two water heaters.

This is why I think house-hack buyers should evaluate a property through two different lenses:

Would I actually want to live here?

AND

Does this make sense as an income-producing property?

You want both answers to make sense.

Financing May Be More Accessible Than You Think

One of the most interesting things about house hacking is that you're purchasing a property you intend to occupy as your primary residence.

Depending on the property and your specific financial situation, that can open up financing options that look very different from financing a traditional investment property.

I'm also a veteran and have personal experience using VA financing, so this is an area I'm especially passionate about discussing with military and veteran buyers.

But financing rules vary based on loan program, property type, occupancy, borrower qualifications, and current guidelines.

That's why I always want the lender involved early.

Before we fall madly in love with the adorable duplex with the garden and perfect little breakfast nook, let's make sure the financing works. 😂

The Part Nobody Talks About: You're Also a Landlord

There is another side to this.

Rental income isn't free money.

You're becoming a housing provider.

That means maintenance calls.

Leases.

Repairs.

Tenant communication.

Vacancies.

Unexpected expenses.

And depending on where you live, landlord-tenant laws can be extensive.

If the thought of someone texting you because their garbage disposal stopped working makes you want to throw your phone into Puget Sound, factor that into your decision.

You can hire property management, but that's another expense you'll need to include when calculating the investment.

For me, the financial benefits of owning a duplex made sense.

But I don't want buyers going into house hacking thinking it's completely passive income.

It's still a property.

Properties require work.

House Hacking Can Also Be a Stepping Stone

This is where I think the strategy gets REALLY interesting.

Imagine buying a duplex and living in one side.

You rent the other side.

Over time, you build equity.

Eventually, your circumstances change and you decide to move.

Instead of automatically selling the duplex, you may have the option to keep it and rent your former unit as well.

Now the property that started as your primary residence has the potential to become a fully rented investment property.

Then you move on to your next chapter.

Obviously, whether that strategy works depends on your finances, financing, rental numbers, market conditions, and long-term goals.

But that's why I love talking about real estate beyond simply:

“How many bedrooms do you want?”

I want to know what you want your life to look like five or ten years from now.

Would I House Hack Again?

Yes.

For me, having rental income offset such a large portion of my housing payment is incredibly valuable.

But I would still be picky.

I want the numbers to work.

I want a property I'd actually enjoy owning.

And because I'm still going to LIVE there, I want it to feel like home.

Give me the duplex where I can have my garden, chickens, sourdough starter, dogs running around, herbs hanging in the kitchen and a tenant helping pay the mortgage.

That's my kind of real estate investing. 😂🌿🏡

Thinking About House Hacking in Tacoma?

If you've been thinking about buying in Tacoma, University Place, Fircrest, or the surrounding Pierce County area, but you're wondering whether there's a smarter way to structure your housing costs, let's talk about house hacking.

We can look at duplexes, small multifamily properties, homes with ADUs, and properties with potential additional living spaces — and talk through what might make sense for your goals.

I'm not here to convince you that house hacking is right for everyone.

I'm here to help you understand your options and run the numbers before you make one of the biggest purchases of your life.

Want to explore what house hacking could look like for you?

📲 Text me at 253-353-0606

🌿 Follow me everywhere: @whit_sells_tacoma

🏡 Or visit whitsellstacoma.com

Whitney Lumsden | eXp Realty

This article is for educational purposes only and is not financial, tax, lending, or legal advice. Financing eligibility, rental income treatment, occupancy requirements, landlord-tenant laws, and investment results vary. Talk with the appropriate licensed professionals about your individual situation.