The 25-Year Cost of Ownership Model

The full spreadsheet template referenced in Appendix A of The Resale Trap — with pre-built formulas for maintenance escalation, insurance compounding, capital-expenditure scheduling, and opportunity-cost calculation across a 25-year hold period. Usable for any single-family home in any U.S. state.

What the model calculates

Every home carries a 25-year cost envelope that almost no buyer sees at closing. The model quantifies eight cost streams — mortgage interest, property tax, insurance, utilities, maintenance (escalating at 3–4% annually), major-system replacements (roof, HVAC, water heater, siding, windows, driveway), HOA or metro-district fees if applicable, and the opportunity cost on the down payment. Each stream is modeled as a year-by-year series, discounted to present value, and summed to the total-cost figure the book uses throughout its state-by-state chapters.

The resale-vs-new-build delta emerges from three structural differences: resale homes carry a front-loaded maintenance curve (deferred items the previous owner pushed to the next owner), an older insurance risk profile, and a shorter runway to the next major-system replacement. New-build homes reverse all three — maintenance is back-loaded, insurance starts with fresh materials, and major systems are on fresh warranties. Over 25 years, that structural gap runs $318K–$506K for a typical $400K purchase, depending on state.

How to get the template

The template is distributed with the book rather than as a standalone download, for three reasons:

• It's useless without the methodology. Every cell is anchored to a decision the book walks through — what counts as deferred maintenance, when to use replacement-cost vs actual-cash-value insurance, how to model the capex schedule for a specific house age and climate zone. Handing out the spreadsheet without Appendix A produces garbage-in-garbage-out.
• It's not one template. It's a state-indexed family. Florida is modeled differently from Colorado (insurance repricing), Texas differently from California (property tax caps vs wildfire premium growth). The book ships the state-specific variant as a separate sheet per chapter.
• The data sources decay. Insurance rate tables, metro-district mill levies, and municipal-utility trajectories change every fiscal year. The book includes the source list so you can refresh the inputs yourself when they update.

If you've bought the book and need the spreadsheet resent, email help@theresaletrap.com with your Amazon order ID. Kindle owners get the Excel + Google Sheets versions; paperback owners get the Google Sheets version via link on the verso page.

Running the model without the book

The full spreadsheet is proprietary to the book, but the methodology is not. If you want to build your own version from scratch, Appendix A documents the exact approach:

1. Pull property tax rates + homestead exemption from your county assessor.
2. Get ACH insurance quotes from three carriers with full replacement-cost (not ACV) and check 5-year rate history.
3. Build the maintenance escalation column — base year × (1 + inflation)^year, with a step-function for major replacements.
4. Schedule the capex items on their typical replacement years (roof: 20–25, HVAC: 15–20, water heater: 10–12, etc.) — the book's Chapter 9 has the full decay table.
5. Apply opportunity cost as the average return you'd get on the down payment in index funds, compounded annually.
6. Sum to total cost; divide by 25 to get true monthly ownership cost.

That framework — not the spreadsheet — is what changes how you look at houses. The spreadsheet is an accelerant.

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