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Custom tiny homes

Off-Grid Tiny Homes

Off-grid ready means a home built to accept its own power, water and waste systems rather than municipal hookups. KYRAX builds off-grid ready homes in three formats: a modular home on a foundation, a park model, and a home on wheels. Which format you choose decides where you can legally place it, so the format question comes before the systems question.

An off-grid home runs its own power, water and waste instead of connecting to municipal services. KYRAX off-grid builds are specified before construction starts, so the solar array, battery storage, water collection and toilet choice are sized for your site and your actual loads rather than fitted to a standard package. You can stage the work: specify the capacity now and install the full array later.

01 — What’s in the build

The package, itemized

Systems are sized to your site at design time. Where a figure isn’t published below, it’s because it hasn’t been confirmed yet, not because it varies.

Solar arrayPublished once confirmed
Battery storagePublished once confirmed
InverterPublished once confirmed
Fresh water storagePublished once confirmed
Rainwater collectionPublished once confirmed
WasteComposting toilet or standard plumbing, chosen at design time
Backup heatPublished once confirmed
Thermal envelopePublished once confirmed
Built toIBC/IRC modular (on a foundation), ANSI A119.5 park model, RVIA/NOAH + NHTSA (on wheels)
Package pricePublished once confirmed

02 — What to know

Sizing solar for winter, not for an annual average

A solar array sized on an annual average will underperform in December, when sun hours are at their lowest and heating and lighting loads are at their highest. Sizing that holds up year round starts from the winter figure for your specific site and the loads you actually run, not from a headline wattage.

That is why the array, the battery bank and any backup source are specified together at design time rather than picked off a package list. Two homes of the same size on different sites do not need the same system.

Off-grid in a cold climate is mostly an envelope problem

Every watt the building loses is a watt the array has to replace in the season it produces least. Insulation, air sealing and window specification do more for off-grid viability in a northern winter than adding panels does. Water lines and tanks also need freeze protection that does not depend on grid power, and a backup heat source has to work when the batteries are low.

KYRAX builds for cold climates as standard. The frost depth and roof snow load your build has to meet are set by your state and often by your county or city, and the state guides on this site publish them with the source for each figure. Engineered R-values for the envelope are not published yet and will appear here once they are confirmed rather than estimated.

On a foundation or on wheels changes where it can go

The two paths certify differently, and the certification decides what a county or city treats the home as. Zenith is a modular home built to the IBC/IRC for a permanent foundation, and a modular home is approved state by state under that state's factory-built housing program. Vista is a park model built to ANSI A119.5. Stone is a home on wheels built to the RV pathway, RVIA or NOAH, with NHTSA compliance for the trailer.

For off-grid buyers this matters more than it does for anyone else, because rural zoning frequently permits one of these formats and prohibits another on the same parcel. The dependable permanent-dwelling route is a modular home on a foundation. A home on wheels places under RV and pad rules instead: RV parks, resorts, and land where the local jurisdiction allows movable dwellings.

Off-grid as a backyard ADU

An off-grid accessory dwelling unit is a different problem from an off-grid home on rural acreage. On a serviced lot the question is rarely whether power exists, it is whether connecting to it is worth the trench, the permit and the service upgrade. Going off-grid or partly off-grid avoids that cost.

What it does not avoid is zoning. Cities and counties regulate an ADU on the lot regardless of how it is powered, and the size, siting and parking rules apply either way. Check the lot before you specify the system.

Where you are allowed to build one

Off-grid legality is decided mostly at the county and city level. Three separate rules bind at once: whether zoning permits the dwelling at all, whether the building code permits the water and waste systems you want, and whether the health authority will approve on-site sewage. Any of the three can differ from one county to the next.

The state sets which building code applies, and even that is not uniform. Wyoming's statewide adoptions do not include the IRC, so whether a residential code applies to a house is a local decision there, while Montana adopted the IRC statewide with its tiny-house appendix. In rural Montana, building permits may not be enforced while zoning and septic rules still are. The state guides on this site cite the code section each figure comes from, so you can check them against the source.

Buying an off-grid home: a new build or a listing

Most searches for off-grid homes for sale end on real-estate listings: existing houses and cabins, usually on rural acreage, running whatever systems the previous owner installed. That is a different purchase from a new build. With a listing you inherit someone else's array, battery bank, water source and septic approval, which are the parts that decide how an off-grid home performs.

A KYRAX home is built to order rather than listed. If you own land or are about to buy it, the order of work is the parcel first, then the format that parcel permits, then the systems. The land comes from a listing or an agent. The home that goes on it is the part we build.

An off-grid cabin you can legally live in

What most people mean by an off-grid cabin is a small, self-sufficient home on rural land. Cabin describes the use, not the certification, and the certification is what a county or city looks at. A modular home built to the IBC/IRC and set on a foundation is inspected as a building. A park model is built to ANSI A119.5. A home on wheels is built to the RV pathway.

That difference decides whether the cabin can be lived in. Montana titles a tiny house on wheels as a travel trailer, which makes it a vehicle rather than real property, and it cannot be permanently occupied as a dwelling except where local rules allow, such as an RV park or campground. In Montana a modular home on a permanent foundation is a factory-built building instead. Check the parcel before you choose the format.

Off-grid cabin kits versus a finished build

A cabin kit ships some or all of the structure and leaves the rest to you or your contractor. For an off-grid home, the rest is the work that decides whether it functions: the electrical system that ties the array and batteries together, water storage with freeze protection, a waste system the health authority will approve and, for most shell kits, the insulation and air sealing.

KYRAX does not sell kits. We build finished homes in the factory, with the off-grid systems specified before construction starts. The kits versus turnkey guide below compares the two paths on total cost, including the line items a kit price leaves out.

03 — Models

4 models available

Every model is fully customizable with your choice of layout, exterior, and upgrades.

ValeTaking reservations

Trailer · THOW · 8'6" × 24' · ~284 sq ft

RVIA/NOAH + NHTSA

USD quoted at consultation

VistaSpecs finalizing

Trailer · park model · 10'6" × 36'

ANSI A119.5 park model

Launch pricing announced at consultation

ZenithSpecs finalizing

Foundation · modular · 12' × 44'

IBC/IRC modularMortgage-financeable

Launch pricing announced at consultation

StoneSpecs finalizing

Trailer · THOW · 8'6" × 38' gooseneck

RVIA/NOAH + NHTSA

Launch pricing announced at consultation

04 — Common questions

Frequently asked questions

What does 'off-grid ready' mean?

It means the home is built to accept solar panels, battery storage, water collection and filtration, and a composting toilet, with those systems specified before the build starts rather than retrofitted afterwards. Choosing the capacity at design time is what keeps the systems, the envelope and the electrical layout consistent with each other.

How much does a full off-grid system cost?

It is quoted at design time, because the array, battery bank and water storage are sized to your site and your loads rather than sold as one fixed package. A home on a shaded northern lot and a home on an open southern slope do not need the same system and should not be quoted the same price. Package figures will be published on this page once they are confirmed.

How much solar does a tiny home need?

There is no single answer, and any builder quoting one without asking about your site is guessing. The array is sized from your winter sun hours, your daily load in kilowatt-hours, and how many days of autonomy you want the battery bank to carry. Heating is usually the load that decides it.

Can an off-grid home be used year-round in a cold climate?

Yes, if it is designed for your site's winter. Cold-climate insulation, freeze protection for water lines and tanks, and a backup heat source that works when the batteries are low are all part of the design rather than add-ons. The frost depth and snow load your build has to meet come from your state and often from your county or city.

Is living off-grid legal?

It depends mostly on your county or city. Zoning decides whether the dwelling is permitted, the building code decides which water and waste systems are allowed, and the health authority decides on-site sewage. Even the code varies: Wyoming does not adopt the IRC statewide, so whether a residential code applies to a house is a local decision there.

Can you get a mortgage on an off-grid home?

On a foundation, often yes. A modular home on a permanent foundation follows the standard mortgage path because it is real property, once your state's factory-built housing program has approved it. Zenith is built to the IBC/IRC for that route. A home on wheels is personal property and finances through RV or chattel lending, where NOAH certification is recognized by US lenders and insurers.

Do you have off-grid homes for sale?

We build self-sufficient homes to order rather than holding finished inventory, because each home's power, water and waste systems are sized for the site it is going to. If you are after an existing off-grid house with land, that is a real-estate listing. If you already have land or are buying it, check what the parcel allows first.

Can a KYRAX home be used as an off-grid cabin?

Yes, if the format suits the parcel. A modular home on a foundation is inspected as a building, which is how zoning treats a house. A home on wheels is built to the RV pathway, and in Montana, for example, it is titled as a travel trailer and cannot be lived in as a permanent dwelling except where local rules allow. Choose the format after checking the parcel, not before.

Do you sell off-grid cabin kits?

No. We build finished homes, with the power, water and waste systems specified before construction. A kit leaves those systems, and with most shell kits the insulation and air sealing too, to the buyer. That is the work that decides whether an off-grid home holds up in winter.

What is the cheapest way to go off-grid?

Start with the format the parcel permits, because a home you cannot legally live in is the most expensive outcome. Then stage the systems: specify the capacity at design time and install the full array and battery bank later. The affordable tiny homes page covers the lower-cost end of the lineup.

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