Stay, sell, renovate, or build? It's the wrong question.

Stay, sell, renovate, or build? Most homeowners are asking the wrong question.

When a homeowner starts thinking about what to do with their property — kids growing up, parents getting older, the kitchen feeling tired, the house no longer fitting — the question they almost always ask themselves is the same one.

"Should we sell?"

That's the wrong question, or at least an incomplete one. What they're actually facing is a four-way decision:

Stay (and keep building equity)
Stay & renovate (update what you have)
Stay & convert (turn unused space into a separate unit, or build an ADU on the lot)
Sell and move on

Each path has different financial implications, different tax consequences, and different lifestyle outcomes. And in California especially, the math often favors a path most homeowners don't even know to consider.

That's why we built the HomeWiP property decision quiz. A 12-question, 3-minute tool that takes your specific situation — your home, your goals, your equity, your tax position — and tells you which of those four paths actually fits. Not as a shortcut around professional advice, but as the start of a smarter conversation with your CPA, your financial adviser, and your local agent.

We stress-tested it on four real Bay Area situations before launch. Here is what it found.

The empty nesters who didn't know they were sitting on a wealth machine

A couple in their late 50s. Bought a four-bedroom in San Mateo in 2014 for $1.1M. The home is now worth around $1.9M. Their kids have moved out. Three bedrooms sit empty. They are paying about $13,000 a year in property taxes, locked in by Prop 13 at a fraction of what a new buyer would owe.

When we ran them through the quiz, the recommendation was not sell. It was not even renovate. It was Stay & Convert: turn one of the unused bedrooms into a JADU (junior ADU) with a private entrance and small kitchen. Rent it for roughly $2,200 a month, or hold it ready for an aging parent or returning adult child. They keep their Prop 13 basis. They keep their 3% mortgage. They turn a paper-rich situation into actual cash flow — without losing what makes their home valuable in the first place.

The catch: most empty nesters in their position have never considered this. They are either staying put doing nothing, or jumping to "we should downsize" — both of which leave significant money on the table.

The young family who needed space for visiting grandparents

A couple in their early 30s. Just had their first baby. Both work. The grandparents fly in from out of state for two-to-six-week stretches to help with childcare. They bought a 3-bedroom starter home in the East Bay in 2023 for around $1.3M, with a 6.5% mortgage and modest equity.

Standard advice would push them toward selling and trading up — bigger house, more bedrooms, problem solved. The quiz routed them somewhere different: Stay & Convert their attached garage into a JADU for the visiting grandparents.

Why this works for them:

They bought recently, so capital gains are minimal (under the federal exclusion).
They don't have a sub-4% mortgage to lose; they're already at 6.5%.
Selling and rebuying in the Bay Area would cost them ~$80,000–$100,000 in transaction costs alone.
The garage conversion solves the actual problem — space for parents — for a fraction of the cost.

Selling is not tax-poisoned for them the way it is for long-tenured owners. But it is still expensive. The quiz makes that explicit so they can compare honestly.

Curious which path the quiz would pick for your home?

Take the Quiz

The growing family who almost made the most expensive mistake in California real estate

Two working parents, mid-40s, two kids in early teens. Bought their San Mateo home in 2013 for $950,000, now worth $2M. Refinanced at 2.875% in 2021. Equity around $1.35M. Kids need separate rooms. Parents want more space, especially for working from home.

This is the classic move-up profile. They are outgrowing the home. They have equity. Standard advice — and most online calculators — would tell them to list, sell, and buy bigger.

The quiz said no. Or more precisely: before you list, look at the numbers.

Their unrealized gain is about $1.05M, of which $550k is taxable after the federal exclusion. Combined federal + California capital gains tax: roughly $130,000–$180,000. They lose Prop 13 entirely; their replacement home gets reassessed at full market value, taking property taxes from ~$11,000/year to ~$25,000+/year. They surrender their 2.875% mortgage and pick up a 7% one — adding ~$2,500/month to their housing cost on a likely larger loan. Transaction costs: another $100,000.

Total all-in cost of moving: roughly $500,000–$700,000. To gain a few hundred extra square feet.

The recommendation: Build Addition. Spend $250,000–$400,000 extending their existing home. Same neighborhood, same schools, same Prop 13 basis, same low-rate mortgage, — at half the cost of moving and with vastly more certainty.

This is the persona that vindicates the entire tool. Without it, they would have done what their friends and most online calculators would tell them to do, and quietly lost half a million dollars.

The retirees moving to be near their grandkids

A couple in their late 60s. Bought their Cupertino home in 1998 for $550,000. Now worth $2.6M. Mortgage paid off. Property tax base still around $700,000 thanks to Prop 13.

This is the case where Sell is genuinely the right answer — and the quiz says so, confidently. Their daughter and grandkids live in Folsom. They want to be 15 minutes away, not 2 hours. The home is simply too big now.

Two things matter for the recommendation. First, they qualify under California's Prop 19, which lets homeowners 55+ transfer their existing property tax basis to a replacement home anywhere in California. The Folsom move keeps their $8,000/year property tax bill instead of jumping to $17,000+ for a similarly priced replacement. Second, the cap gains tax bill — about $470,000–$530,000 after federal + California — is real, but it is the cost of a move they have actively chosen, not a hidden gotcha.

The quiz also handles a variant most homeowners don't realize matters: if the same daughter lived in Bellevue, Washington instead of Folsom, the math changes. California taxes the gain on California real estate regardless of where you live when you sell. Moving to Washington first does NOT save you California capital gains tax — that's a common and expensive misconception. The quiz surfaces this directly so retirees don't structure their move in ways they'll regret.

What the quiz does that calculators don't

There are a hundred home-equity calculators online. Most do one thing: tell you what your home is worth. The good ones add a mortgage payment estimate or a refinance comparison. None of them help you decide what to actually do.

Our quiz is built around a different premise: the right answer depends on your situation, not just your numbers. So it asks about:

Your time horizon (different paths require different commitment lengths)
Your privacy preferences (some homeowners would never have a tenant on their property — that is a hard constraint, not a financial one)
Your California ownership tenure and Prop 19 eligibility (the single biggest factor most tools ignore)
Your project tolerance and available equity (capacity, not just willingness)
Your destination if you're considering a move (because state taxes vary by 13 percentage points)

Then it gives you three things, not one:

A primary recommended path
A ranked shortlist of three options to discuss with your financial adviser
A focused list of questions to bring to that conversation

It is not a substitute for talking to your CPA. It is the prep work that makes the conversation productive.

Try it

The HomeWiP property decision quiz is free and takes about three minutes. No email required to see your result. We built it for homeowners who want to make a six-figure decision with both eyes open.

Ready to see what fits your situation?

Take the Quiz