The decision library / Original worked example
Tiny home cost breakdown: the nine lines that decide the real number.
The price of the home is one line. The project has nine. Here is how to lay them out so nothing hides.
Illustrative figures. Two lines stay open on purpose: land and financing.
| Cost line | Illustrative USD | Status in this example |
|---|---|---|
| 1. Home (dated builder quote) | 72,000 | Firm quote |
| 2. Land or lot access | — | Open: purchase, lease or family land |
| 3. Delivery and set-up | 6,500 | Separately quoted |
| 4. Site preparation (access, grading, pad or foundation) | 21,000 | Estimate, subject to site visit |
| 5. Utilities (water, wastewater, power) | 14,000 | Estimate: two of three still allowances |
| 6. Permits, fees and inspections | 3,200 | Quoted by the county |
| 7. Insurance and registration, first year | 1,800 | Quoted |
| 8. Finish work and move-in (steps, skirting, furnishing) | 5,500 | Estimate |
| 9. Financing cost | — | Open: depends on loan type and term |
| Known subtotal (lines 1, 3–8) | 124,000 | |
| Contingency, 20% on lines 4, 5 and 8 | 8,100 | $40,500 × 20% (allowances, not firm quotes) |
| Known subtotal with contingency | 132,100 | Land and financing still open |
Why the home price is the smallest surprise.
Builders quote the thing they control: the home. Everything else is quoted by someone else, or by nobody yet. In this original example the home is $72,000, and the other known lines add $52,000 before anyone has bought land or signed a loan. That is not a warning about tiny homes. It is what every housing project looks like once the lines are written down.
Monthly-payment framing makes this harder to see. Clever Tiny Homes lists its models as “From $591/month*” and footnotes the figure as an estimated payment that depends on loan amount, term, rate and qualifications. That is a financing illustration for the home, which is fair for a builder to show. It is not a project budget, and it does not claim to be. Checked October 27, 2026.
Separate firm, allowance and open.
Give every line one of three labels. Firm means a dated, written quote for a defined scope at your address. Allowance means a number someone gave you before seeing the site, or a rule of thumb. Open means nobody has put a number on it yet. In the table, lines 1, 3, 6 and 7 are firm or quoted; lines 4, 5 and 8 are allowances; lines 2 and 9 are open.
Contingency belongs on allowances, not on firm quotes. Here we apply 20% to the three allowance lines: $21,000 + $14,000 + $5,500 = $40,500 of work at risk, and 20% of that is $8,100. A firm quote does not need a cushion for being wrong; it needs a cushion for scope that was excluded, which is what line 8 is for.
Why land and financing stay blank.
Land is the line that swings the project by the most and the one with the fewest honest shortcuts. Family land at no cost, a leased pad in a community, and a purchased rural lot are three different projects wearing the same home. Leave the line visible and blank until you have a specific parcel, then add its purchase or lease terms, its access, and its utility distances, which feed straight back into lines 4 and 5.
Financing cost depends on what you are financing. A home on wheels is often financed like a vehicle; a home on a foundation on land you own may qualify for a construction or conventional loan. The interest paid over the term is a real project cost, so write it in once a lender has quoted the term and rate, and not before. The wheels versus foundation guide walks through what that choice changes.
Take three questions into your next call.
- For each line, who is quoting it, and have they seen my site?
- Which of my utility lines are allowances, and what would make them firm?
- If land and financing both come in at the high end of what I am considering, does the project still work?
If the home you are considering is $80,000 and you want to see the same method with different lines, the move-in budget example applies 10% contingency to a smaller set of site costs.
Put the method to work
Make the next decision yours.
Enter your own nine lines in the free planner, mark each one firm, allowance or open, and keep the total honest. The $39 Decision Kit adds the quote-comparison worksheet for when two builders quote different scopes.