The real cost of the lake house: the math most buyers never run

The lake house is affordable. What it actually costs over its lifetime, almost nobody runs. Here's the math.

Most financial conversations about a lake house, a vacation property, or a second home focus on whether you can afford the purchase. That’s the wrong question. The right question is what the property will actually cost over its ownership lifetime, and whether that cost is the highest-value use of that capital.

Running that math completely changes what “affordable” means.

The real cost of the lake house nobody runs

Let’s use a specific example. A lake house purchased for $650,000. Mortgage down payment of $130,000 (20%). Mortgage balance of $520,000 at a 7% rate over 30 years produces a monthly payment of approximately $3,460. Annual mortgage cost: $41,500.

Property taxes on a $650,000 property vary widely by state and municipality, but a rough average across many lakefront markets runs 1 to 1.5% of assessed value annually. Call it $8,000 per year.

Insurance on a lakefront property, accounting for water, flood, and liability coverage, often runs $3,000 to $6,000 annually. Per the Insurance Information Institute, vacation and secondary home policies carry higher premiums than primary residence coverage due to vacancy periods and higher risk categories.

Maintenance on a property that sees infrequent attention costs more, not less. The roof, the dock, the HVAC, the seasonal opening and closing, the lawn and landscaping. A working estimate for annual maintenance on a vacation property is 1 to 2% of the property value, $6,500 to $13,000 per year.

Add carrying costs: utilities during use and in off-season, furnishing and equipping the property, travel to and from. A conservative all-in annual cost for a $650,000 lake house: $65,000 to $75,000 per year.

What that capital could do instead

The $130,000 down payment invested in a diversified portfolio with a historical 7% annual return grows to approximately $510,000 over 30 years. That’s the opportunity cost of the down payment alone.

Per the IRS, capital gains on a second property sold at a gain do not qualify for the primary residence exclusion. The full gain is subject to capital gains tax, 20% federal for high earners, plus the 3.8% Net Investment Income Tax, plus any applicable state tax. A property that appreciates from $650,000 to $900,000 over 15 years generates a $250,000 gain. After federal and state taxes in a high-tax state, the after-tax gain may be closer to $150,000. Meanwhile, the property has cost $65,000 to $75,000 per year to own.

When the lake house math actually works

None of this means second homes are financially indefensible. Some of the best financial decisions people make are ones that don’t optimize purely for return.

The math tilts more favorably in a few specific scenarios. High rental income if the property generates significant rental revenue when not in personal use can change the return profile. Appreciation in a market where property values have consistently outpaced maintenance costs shifts the calculus. Estate value if the property carries multigenerational meaning and would be held by the family over decades, with the lifestyle value distributed across many people.

The problem isn’t the lake house. It’s that most people buy it without running these numbers, and then discover 10 years in that the property requires $70,000 a year to hold and has become a financial anchor rather than a lifestyle asset.

The question to answer before you buy

What does this property cost per day that we actually use it?

If the lake house sits unused for 300 days a year and costs $70,000 annually, the cost-per-use-day is $350. If it sits unused for 250 days (a fairly engaged ownership pattern), cost per day is $280. Would you pay $280 a day to rent a lake house on every trip? If not, you’re overpaying for the ownership structure.

Jeff isn’t arguing against second homes. He’s arguing for running the numbers before the emotional momentum of “we deserve this” replaces the financial analysis that should come first.

Schedule a no-obligation call with Jeff to run the actual numbers on a property purchase you’re considering, including what that capital does on the alternative path.

The information provided is for educational purposes only and should not be construed as investment advice. Investment strategies should be tailored to individual circumstances, risk tolerance, and goals. Past performance doesn’t guarantee future results. Consult with qualified financial professionals regarding your specific situation.

Securities offered through LPL Financial, Member FINRA/SIPC. Investment advice offered through Great Valley Advisor Group, a registered investment advisor and separate entity from LPL Financial.