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What You Need to Know About Tiny Cabins

Going small–really small–has been a huge trend, but there's a big difference between having a "tiny house" and owning a solid, smart cabin. Here's what you need to know.

Written by Alex Charvat


Photo: fotolia.com/ppa5 photo

 

In this, our digital age, we expect our technological advancements to pack more features in ever-smaller packages: smaller phones with better cameras, smaller cars with better handling, ultra-thin laptops with lightning-speed processors and minute batteries with 10-year life spans. We’ve come to expect products to be loaded with bells and whistles without taking up much space; well, that is until we consider our houses.

 

Around 1970, the average home size was 1,500 square feet. Fast-forward 50 years, and it’s nearly doubled. Houses have increased in size every year for decades, despite the proclivity to downsize elsewhere.

 

However, there’s been a recent backlash toward that trend that’s been dubbed “the McMansion,” and you can sum it up in two words: tiny houses.

 

There are references to tiny homes throughout history, but the biggest push has come from the tiny home TV shows that have aired in the past five years. These programs vary from building them to buying them, and the styles run the gamut from mild to wild. The one thing they all seem to have in common is that they’re on wheels. Of course they have wheels, how else could you move them? But this seemingly trivial detail has a very big impact on their construction and safety, not to mention financing, insurance and tax implications.

 

Defining a tiny house is a thing up for debate. Some say it’s an RV designed for temporary living anda falls under American National Standards Institute (ANSI) 119.2 RV trailers. Others say it’s a permanent residence and falls under ANSI 119.5 Park Model Trailers; while still others argue it’s a manufactured home and the Fed’s Housing and Urban Development (HUD) has oversight when it comes to construction guidelines.

 

There are a few things in common with all schools of thought. First, they all have wheels; and second, the consensus is that the living area is less than 400 square feet. But there’s always an exception to the rules, right? In this case the International Building Code (IBC) stepped in to take a swing at the problem and decided to define a tiny house as “houses that are less than 400 square feet in area,” eliminating the wheel requirement. It’s a whopping one-page appendix called “Appendix Q” in the 2018 International Residential Code (IRC) and it’s not enforceable unless a jurisdiction specifically adopts it. But the real issue here is that there isn’t an overseeing body regulating safety with tiny homes. No building codes; no inspections; few, if any, regulations. It’s caveat emptor with your house!

 

What are the tiny house pros and cons? Listing the advantages first, they are relatively inexpensive, mobile, low maintenance (mainly due to their size) and don’t require a professional builder, as in you can do it yourself. (Bonus pro: There’s no room for the in-laws during the holidays.)

 

Unfortunately, the disadvantages are many. Construction isn’t regulated and safety could be an issue; they have no storage for gear like skis, bikes or tools; and while they’re mobile, they require a heavy duty (and costly) vehicle to tow them. They need auxiliary power, water and waste disposal; there’s no room for your friends to visit; and probably most importantly, it’s nearly impossible to get a mortgage loan for them. (According to a national mortgage lender, a traditional mortgage is possible if the house is over 600 square feet. A semi-tractor trailer is 53 feet long and 8 feet wide. You do the math.)  And because they have wheels, they are considered personal property, not “real” property, which means that like cars, they depreciate the moment you drive them off the lot; while a house on a permanent foundation will appreciate in value.

 

The Tiny Cabin

What happens if we take the wheels off and put the structure on a foundation? It’s called a tiny cabin.

Emphasizing the simplicity of this one change is important, as the ramifications are significant. First, the confusion about which “dot gov” department gets to oversee your plans is gone. It’s the local building department. The storage issues are over — even if it’s a 300-square-foot cabin that you’re dreaming of, there will be room on the property for a shed or garage. The cabin will require water, but options for placing a cistern, well or even a city tap exist. Electricity on or off the grid is an option. The building officials may not be overly concerned about how the cabin is powered or even where the water comes from, but where the waste water goes is a huge concern, and rightfully so. Waste removal likely will be mandated by the county or state, requiring a holding tank, septic field or city sewage.

These kinds of daily life conveniences are important, but property appreciation may be the most significant advantage to a tiny cabin. Residential investments typically increase in value over the long term. Obviously, many factors come into play, but a 10 percent increase in the first year is not unheard of (neither is a 50 percent decrease in value on a wheeled vehicle after the first year).

Another check mark in the tiny cabin pro column is that weight and physical dimensions aren’t an issue. If your tiny cabin dream is 500 square feet sheathed in lightweight aluminum siding, so be it. If it’s built with 10-inch-diameter logs, even better. Options are now open to you that weren’t available when the “foundation” was a dual-axle utility trailer rated to weigh a max of 10,000 pounds. Quality levels may differ with various builders, but life-safety features will be mandated and inspected by the local building department.

 

Making the Tiny Cabin a Reality

What’s the first step to making a tiny cabin dream come true? Land. If you can’t “Go West young man,” as Horace Greeley noted about America’s expansion, look for inexpensive, building-code-friendly land. Make sure the jurisdiction allows for residential structures smaller than 600 square feet in your desired area. And when it comes to expense, remember that construction and material costs will fluctuate in different regions of the country, so what’s doable for $50k on one lot may cost $100k a few states, or even counties, over. It doesn’t need to be vast, but a flat, buildable lot will save on construction costs.

As for construction itself, it will be regulated by the building department, and this is where it gets tricky. While the tiny house offers free rein for creative minds, the tiny cabin plays by more rules. Previous building code thresholds required residences to be at least 600 square feet, though many jurisdictions have eliminated that mandate and merely require all the room sizes to be no less than code minimums. For example, the IRC says a bedroom has to be a minimum of 70 square feet with at least one wall that’s 7 feet long and at least half the ceiling at 7 feet tall. Other rules require egress windows and properly designed stairs with electrical and plumbing installed per their respective codes. These aren’t bad things, in fact they add to the value of the cabin, as subsequent buyers are assured of a safe construction standard. Going tiny is still possible; it just takes some creative design skills.

 

Simple and Multi-use Design

Keep the building simple. Since it’s cost, or lack thereof, that drives this tiny cabin idea, simple plans keep the price down. Think rectangular footprint, a crawl space or monolithic slab foundation, a shed or single-gable roof, stock window/door sizes, downsized cabinets or open shelving and compact appliances. Use every inch of extra space for storage and mechanicals.

Also, strive for two-for-one functionality where you can. Pick a roof pitch that’s ideal for a solar panel. Insulate a concrete-slab foundation and seal it after it cures so it can serve as your finished floor. Install a propane-fired “wood stove” so it meets your heating needs and adds ambiance. Have the attic designed for storage. Choose furniture that pulls double duty, such as a sofa sleeper or expandable table (turn to page 30 for ideas).

Be creative and eliminate anything that isn’t necessary. If need be, a small shed can be added on the property for storing items that don’t require conditioned space. Unlivable space is significantly less expensive to build than livable space. 

Hundreds of tiny cabin floor plan ideas exist online, but keep in mind that architectural plans are protected by copyright, so you’ll need to buy them or have permission to use them. Don’t be afraid to reach out to an architect or engineer for help — building code officials may require engineer-stamped plans anyway.

 

Use Logs

Logs might have a slightly higher up-front cost than other types of building materials, but a small log shell package can be had for $25,000 — maybe even less. That may seem like a lot for a tiny cabin, but remember, it includes your wall framing, interior wall finish, insulation and exterior wall finish in one svelte package. Smaller diameter logs can be stacked by two people, as well ­– no need for an expensive crane. Milled logs are universal in terms of fit, don’t need to be prebuilt off-site and can be ordered as a wholesale product. Logs are a simple construction solution that add a degree of charm unmatched by any other building material.

 

Go Pro

Enlisting a professional builder to erect your tiny cabin will add some cost to your bottom line, but it will eliminate the most stressful headaches related to building code navigation and compliance. In terms of saving your sanity and getting a safe structure in the process, the benefits of a builder cannot be emphasized enough.

Tiny living doesn’t have to be confined to a depreciating asset that’s limited by the capacity of a cargo trailer. The same simple, peaceful concepts of living tiny can be transferred to a cabin that will increase both in value and your level of enjoyment. 

Alex Charvat is a licensed engineer and forestry expert who has designed hundreds of houses from log cabins to trophy homes. He’s hosted Cabin Rescue and served as a consultant on Building Off the Grid — Vail, CO, both shown on the DIY Network. He’s currently a Log & Timber Home University  professor (live and online), and he owns Alexander Structures, Inc., a national engineering and design firm.