In this guide
Almost everything written about tiny homes is about whether you would enjoy living in one. That is a fine question and you can answer it yourself.
The question you cannot answer yourself, and the one that decides whether the plan works at all, is which of three legal categories your tiny home falls into. Everything else follows from it: where you can legally put it, whether you can get a loan and at what rate, how it is taxed, whether it is insured as a house or a vehicle, and whether it holds value or depreciates like a truck.
The three categories are a recreational vehicle, a manufactured home, and a site-built dwelling. They are defined in different places by different authorities, and the difference between them is not the size of the house. It is a certification label, a foundation, and in some states a recorded affidavit.
Category one: a recreational vehicle
Most of what the internet pictures as a tiny home, the one on a trailer with a loft and a cedar exterior, is legally a recreational vehicle. Federal regulation exempts a unit from the manufactured housing code if it is a vehicle or vehicular structure not certified as a manufactured home, designed only for recreational use and not as a primary residence or for permanent occupancy, and either self-propelled or built and certified to one of two named industry standards.
Read that middle clause again. The federal exemption that makes a park model RV possible is conditioned on it not being designed as a primary residence. The rule then requires the manufacturer to put a notice on the unit saying exactly that, in those words.
The 400 square foot figure people quote for park models comes from the industry standard itself rather than from the federal regulation, so it is accurate by reference but not something you will find in the federal rule text.
What that classification does on the ground is the part buyers feel. Mohave County, Arizona allows an RV as a single-family dwelling only in RV zoning, in RV parks and in approved portions of manufactured home parks, and states that recreational vehicles are not permitted as permanent residences in any other zone or under any other circumstances. Navajo County, Arizona says no RV shall be placed on a permanent basis, requires an extra ten feet of setback from every property line, and prohibits generators as the RV's power source. Putnam County, Florida issues temporary RV occupancy permits for site clearing at 60 days, or construction or hardship at six months, renewable one time only.
Category two: a manufactured home
The federal definition is specific and it has a floor. A manufactured home is a structure transportable in one or more sections which is 8 body feet or more wide or 40 body feet or more long in the travelling mode, or 320 or more square feet when erected on site, built on a permanent chassis, designed for dwelling use with plumbing, heating, air conditioning and electrical systems.
Which means a factory-built unit under 320 square feet cannot be a manufactured home and cannot carry a HUD label. There is no HUD-labelled tiny house. If it is factory built and smaller than that, it is an RV.
Where a manufactured home is allowed is a different and better story than for an RV, because federal law preempts state and local construction standards. A county cannot impose a different building standard on a HUD-labelled home. What preemption does not reach is zoning, placement, foundations or appearance, and that is where the local rules live.
Those local rules vary more than most articles admit. Putnam County, Florida prohibits homes manufactured before 30 June 1976 from being brought into the county at all, and requires a wind zone data plate on homes built before July 1994 plus skirting before occupancy. North Carolina goes the other way and bars it: state law lets local governments regulate the location, appearance and dimensions of manufactured housing but not exclude it, and specifically bars restrictions based on the age of the home. Appearance standards remain lawful in North Carolina, and courts there have upheld requirements for lap siding, minimum roof pitch, shingled roofs, decks or porches, removal or screening of travel hitches, and brick underpinning.
So the line people repeat, that manufactured homes face age restrictions, is true in some places and illegal in others. Ask the county.
Category three: a site-built dwelling
Build the thing on the land, on a foundation, to the residential code, and it is a house. That is the entire advantage of this category and it is a large one.
The code even has a tiny-house chapter, though the name moves. The International Residential Code added Appendix Q, Tiny Houses, in the 2018 edition, renumbered it to Appendix AQ in 2021, and it is Appendix BB in the 2024 edition. It defines a tiny house as a dwelling 400 square feet or less in floor area excluding lofts, and relaxes the things that otherwise make small houses non-compliant: ceiling height drops to 6 feet 8 inches in habitable space and 6 feet 4 in bathrooms and kitchens, lofts are allowed at a minimum 35 square feet and 5 feet in any horizontal dimension, and loft access may be a ladder at 70 to 80 degrees instead of a code stair.
The catch is in the word appendix. Code appendices are not mandatory unless the adopting ordinance specifically references them. So the right question for your county is not whether the IRC has a tiny house appendix, which it does, but whether your jurisdiction adopted it. Minnesota did, and its state code includes the tiny house appendix with the 400 square foot definition. Elsewhere, adoption often happens county by county, which is why a state-level table would mislead you.
Without the appendix, the baseline code applies: habitable rooms other than kitchens need at least 70 square feet of floor area and at least 7 feet in any horizontal dimension, with a 7 foot ceiling height.
| Item | Recreational vehicle | Manufactured home | Site-built |
|---|---|---|---|
| Built to | RV industry standards | The federal HUD code | The residential code |
| Size floor | None, typically under 400 sq ft | 320 sq ft or 8 body feet wide | None |
| Where it can go | RV zoning, RV parks, temporary permits | Most residential zones, with conditions | Anywhere a house is allowed |
| Property type | Personal property, titled vehicle | Personal property unless affixed and converted | Real property from day one |
| Typical financing | Vehicle or chattel loan | Chattel, or a mortgage if converted | Mortgage |
| Value over time | Depreciates like a vehicle | Depends on conversion | Valued with the land |
The minimum square footage question, and the surprise in it
Everybody expects the county to be the problem here, and in the counties we checked it was not. Levy County, Florida states plainly that it has no minimum size requirement for one and two family dwellings, and that only the state code's 70 square feet per habitable room applies. Charlotte County, Florida takes the same position.
Both counties then say the same thing about where the real constraint comes from: private deed restrictions or covenants may impose size minimums, and they point you at the clerk of the circuit court or a title attorney.
That is a far more useful warning than a generic zoning caution, because it is checkable before you buy. A 1957 bill of assurance in a platted Arkansas subdivision sets a 600 square foot minimum dwelling and bans trailers used as residences, in a county with no zoning at all. The county will tell you there is no minimum. The recorded instrument says otherwise, and your neighbour can enforce it. We went through that whole layer in what unrestricted land actually means.
Some counties do set minimums, usually for accessory dwellings rather than primary ones. Mohave County, Arizona requires an accessory residence to have a living room of at least 120 square feet of habitable floor area, plus an additional 70 square feet for each occupant beyond two, with a closet, a kitchen and a separate bathroom.
Financing, which is where the money actually goes
This is the part the pros-and-cons listicles skip, and it costs more than the house.
Federal mortgage data shows that about 42 percent of manufactured home purchase loans were chattel loans, meaning secured by the home only and not the land. The median interest rate on those was 8.6 percent, against 4.9 percent for a manufactured home mortgage and 4.1 percent for a site-built mortgage. Median term was 23 years for chattel against 30 for both mortgage categories. The denial rate on chattel applications was 50 percent, and only 27 percent of manufactured home loan applications resulted in an origination against 74 percent for site-built.
Put that gap on a $90,000 home over its term and it is tens of thousands of dollars, which is more than the difference between the categories of house.
The way out of chattel treatment, where the structure allows it, is conversion to real property. The mechanism is statutory and varies by state. Arizona uses an affidavit of affixture recorded with the vehicle identification numbers, the legal description of the land and the transportation department's receipt. North Carolina records an affidavit after the motor vehicle title is cancelled, and on recordation the manufactured home becomes an improvement to real property. Florida taxes a mobile home as real property where the owner of the home also owns the land it is permanently affixed to, and issues an RP series sticker to show it.
Note what all three have in common. You have to own the land, the structure has to be permanently affixed, and somebody has to record a document. Leased-land placements generally do not qualify, and Arizona's statute says so directly for homes in parks.
Does it depreciate? The honest answer
Half the internet says tiny homes depreciate like cars and half says they are a great investment. The first group is describing an RV and the second is describing a house, and neither one says so.
A towable unit is a vehicle in law. It is titled, registered and taxed as tangible personal property, financed as chattel, excluded from permanent-dwelling zones, and it depreciates. A permanently affixed dwelling on land you own, with the conversion recorded, is an improvement to real property and is valued with the land.
The strongest available evidence on how often people actually make that conversion is sobering. Of new manufactured homes placed in 2024, 78 percent were titled as personal property and only 18 percent as real estate. Ten years earlier it was 80 and 13. So the depreciation story is mostly true in practice, not because small houses are bad but because most of them never become real property at all.
One more thing worth saying plainly: there is no credible resale data on tiny homes specifically. No federal agency, no Census or HUD product and no extension service tracks it. Any resale percentage you see quoted for tiny houses is unsourced.
The things a tiny home does not shrink
A small house still needs an approved water supply and an approved means of wastewater disposal, and the system does not scale down proportionally.
North Carolina's rules are a good illustration because they explicitly accommodate tiny houses and still set a floor. The minimum design daily flow for a one-bedroom dwelling with no more than two occupants and 400 square feet or less is 175 gallons a day, which is a genuine reduction from the standard 120 gallons per bedroom with a 240 gallon minimum. But septic tank capacity for a dwelling of four or fewer bedrooms is a minimum 1,000 gallons regardless. One person in 300 square feet installs essentially the same tank as a family of four.
And an RV used as a dwelling loses its RV treatment for septic purposes. North Carolina guidance states that RVs designed or used as permanent dwelling units are required to meet the same requirements as a dwelling unit. The wheels do not exempt the wastewater.
If you are working out whether your ground will take any of this, that starts with the soil evaluation rather than the house plan, which we covered in the test that gates your build.
The order to decide in
The order to decide in
Pick the category before you pick the house.
RV, manufactured home or site-built. Everything downstream, from zoning to financing to taxation, is determined here.
Call the county planning department with the parcel number.
Ask three things: is this category allowed on this parcel, is there a minimum habitable square footage, and has the county adopted the residential code's tiny house appendix.
Pull the recorded restrictions before you assume the county is the only rule.
In the counties we checked the county had no minimum size and the recorded covenant did. That document is at the clerk's office.
Price the financing, not just the house.
A chattel loan at a median 8.6 percent over 23 years against a mortgage at 4.9 over 30 is a larger number than most of the design decisions you are agonising over.
Find out whether conversion to real property is available and what it takes.
Owning the land and a permanent foundation are usually prerequisites, and a recorded affidavit is usually the act that does it.
Budget the septic at full size.
A small house does not get a small system. In North Carolina the tank floor is 1,000 gallons whatever the occupancy.
Where we fit
We sell the land, not the house, and a fair number of our buyers arrive with a tiny home plan. What we will do is give you the parcel number, the county and the subdivision so you can make the category call and the county call before you buy anything you cannot return.
What we will not do is tell you a parcel will take a tiny home, because that depends on the category you choose, the county's rules and whatever is recorded against the deed. If you want the broader version of the permission question, it is in the guide to living off the grid.
If the plan is a small permanent place rather than something on wheels, our homestead land listings are the right place to look, and the recorded restrictions are the first thing to read.
A tiny home is not a legal category and that is the whole problem with the way the subject is usually written about. The county does not have a tiny home rule. It has an RV rule, a manufactured housing rule and a residential code, and your plan lands in one of them whether you chose it or not.
Choose it on purpose. Everything after that gets easier, and the parts that do not get easier at least stop being surprises.
