This tiny house cost calculator turns the cost ranges from our own guides into a full project budget. Pick a size and a build method and your region. Then add the land and site work and utilities that most buyers forget. You get a low and expected and high total in seconds.
Most online calculators give one number with no source. This one shows every assumption and every range. The numbers come from our published cost guides and from named outside sources. Scroll to the method section to see exactly how each line is built.
Tiny homes on wheels top out near 340 sq ft because of road limits. IRC Appendix Q covers foundation homes of 400 sq ft or less.
Estimated total project cost
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Range
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How to Use This Tiny House Cost Calculator
You can finish the form in about two minutes. Start with the size and the build method because those two choices move the price most. Then fill in the site and utility lines. Leave a line on its default if you are not sure. You can come back and change it.
- Set the size. Slide to the square footage you plan to build or buy.
- Pick how the home is built. Owner-built and prefab and custom and wheels each use their own range.
- Choose your region and finish level. A high-cost state and a premium finish both raise the number.
- Add the site and utility lines. Well and septic and solar are the lines most buyers forget.
- Read the low and expected and high totals. Plan around the expected number and keep the high number as your safety limit.
What the Tiny House Cost Calculator Includes
The result covers the whole project and not just the sticker price of the house. It adds the home and the foundation and site work and utilities. It also adds delivery and permits and appliances and a contingency fund. If you choose to buy land the land is added last so you can see the build cost on its own.
It leaves out a few items on purpose. Insurance and property taxes depend on how your home is classified and where it sits. Financing fees and closing costs differ by lender. Landscaping and a driveway and a deck are also excluded. Get written quotes for those lines.
How the Tiny House Cost Calculator Works
The home price is the size you pick times a cost per square foot. We did not invent those rates. They come from the totals in our 400 sq ft tiny house cost guide divided by 400 square feet. For example the guide puts a professionally built modular home at $85,000 to $150,000. That works out to $212.50 to $375 per square foot.
The calculator then adds each extra line as a range or a single point. A finish level picks where the home price sits inside its range. Basic sits near the low end and premium sits near the high end. Those three positions are our editorial assumption and not a measured statistic. Region works as a multiplier. A high-cost state uses 1.63 because our tiny homes cost guide reports $325 to $650 per square foot for California against $150 to $450 nationally. The midpoints are $487.50 and $300 and the ratio is 1.625.
Every figure sits in the table below. Nothing is hidden inside the code.
| Input | Low | High | Source |
|---|---|---|---|
| Owner-built home (400 sq ft reference) | $40,000 | $70,000 | Tiny Homes Nest 400 sq ft cost guide (materials only) |
| Prefab or modular home (400 sq ft reference) | $85,000 | $150,000 | Tiny Homes Nest 400 sq ft cost guide |
| Custom site-built home (400 sq ft reference) | $120,000 | $180,000 | Tiny Homes Nest 400 sq ft cost guide |
| Tiny house on wheels, professionally built | $70,000 | $150,000 | Tiny Homes Nest tiny homes cost guide |
| Pier or slab foundation | $5,000 | $15,000 | Tiny Homes Nest 400 sq ft cost guide |
| Site preparation | $3,000 | $10,000 | Tiny Homes Nest 400 sq ft cost guide |
| Drilled well | $6,000 | $16,000 | HomeServe well drilling cost guide (April 2026) |
| Septic system | $3,500 | $11,200 | HomeGuide conventional systems and Angi typical range (2023) |
| Off-grid solar with batteries | $7,000 | $15,000 | Tiny Homes Nest 400 sq ft cost guide |
| Permits and fees | $1,000 | $2,000 | Tiny Homes Nest tiny homes cost guide |
| Delivery and crane setup | $5,000 (single sample figure) | Tiny Homes Nest 400 sq ft sample budget | |
| Appliances and furniture | $6,000 (single sample figure) | Tiny Homes Nest 400 sq ft sample budget | |
| Land | $18,657 per acre (national average) | Tiny Homes Nest tiny homes cost guide | |
| Contingency fund | 10% | 20% | Tiny Homes Nest tiny homes cost guide |
| High-cost state multiplier | 1.63 (derived from $325 to $650 against $150 to $450) | Tiny Homes Nest tiny homes cost guide | |
Sources Behind the Numbers
We use our own published figures wherever we have them and cite outside data where we do not. These are the outside sources.
- HomeServe well drilling cost guide reports about $6,000 to $16,000 for a 200 foot residential well in an April 2026 article.
- Angi septic system cost guide reports a typical range of $3,469 to $11,182 in 2023 data.
- HomeGuide septic tank system cost guide reports $3,500 to $8,500 for a conventional installed system.
- IRC Appendix Q for tiny houses sets the code rules for foundation homes of 400 square feet or less.
- The National Association of Realtors median existing-home price of $440,600 for June 2026 is quoted as reported in our tiny homes cost guide.
We review these figures when our cost guides change and update the date at the top of this page.
Limits of This Estimate
A calculator cannot replace a quote. Local labor rates and soil conditions and distance to utilities can move a line by thousands of dollars. Some cost lines are single sample figures and not market averages. Treat the low and high numbers as the frame of a realistic budget and treat the expected number as a planning midpoint.
Always confirm zoning and building rules with your local planning office before you buy land or order a home. Our guide on how to buy land for a tiny house explains what to check first. This page is general information and not financial or legal advice.
Tiny House Cost Calculator FAQ
How accurate is this tiny house cost calculator?
It is a planning tool and not a quote. Each line uses a published range and the total shows a low and an expected and a high case. Your real cost depends on your region and your site and your builder.
How much does a tiny house cost per square foot?
Tiny homes generally cost $150 to $450 per square foot nationally. High-cost states can reach $325 to $650 or more. Small homes cost more per square foot than large ones because the kitchen and bathroom cost the same at any size.
What costs does the calculator add that people forget?
It adds the foundation and site work and well and septic and solar and delivery and permits. It also adds a contingency fund. Our guides recommend 15 to 25 percent above the home price for these extras as a starting point.
Can I use the calculator for a tiny house on wheels?
Yes. Choose the wheels option. The size caps at 340 square feet because of road width and length limits. The foundation line is hidden because the trailer is part of the home price.
Why does the calculator show a contingency fund?
Builds rarely land exactly on plan. We suggest a cushion of 10 to 20 percent so a surprise does not stop the project.
Can I finance a tiny house?
Often yes but not with a standard 30 year mortgage. Common options are personal loans and RV loans and chattel loans. The payment line in this calculator uses the rate and term you enter.
Does the estimate include land?
Only if you choose to buy land. The land line uses the national average per acre and your county may be far cheaper or far higher.
Keep Planning Your Budget
Use these guides to go deeper on each cost line.