Homes which have a useful life in centuries, not decades.

We build houses, small to large.
HEXOHM is a new humble company based on Bainbridge Island, Washington.

We offer a different kind of dwelling via a new building system.

We will build better + faster, cleaner + greener.

We will help people + planet.

Mighty. Cool.

Hempcrete (or hemp-lime) is significantly more sustainable + higher-performing than traditional building materials.
Its list of merits sounds almost too good to be true.

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MADE OF

HEMP • LIME • WATER

Hempcrete is a remarkable building material.
Proven in Europe for decades, it is just now allowed in the US.

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FREE OF

CHEMICALS • TOXINS • VOCS

Good for people + planet.
Our homes naturally regulate humidity, and have no noxious off-gassing from toxic materials.
The thick walls are enormous stores of carbon-dioxide.

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RESISTS

FIRE • PESTS • MOLD • ROT

Shelters which are sturdy + safe, tough + resilient.
Hempcrete is non-combustible with low thermal conductivity, and lime's alkaline PH makes it inhospitable to pests + fungus.

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BUILT IN

WASHINGTON STATE

Domestically designed, derived, and constructed domiciles.
We source our raw materials + building products as locally as possible.

The natural house of the future.

HEMPXAGON is our six-sided hempcrete housing concept.
Thanks to our system approach, essentially infinite sizes + layouts are possible.
Below are a couple possibilites.

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1H-1

500 sq ft • One-Story

Starting at $250k

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1H-2

1000 sq ft • Two-Story

Starting at $350k

3D Tour!

Click the gray balls in the 3D environment to switch viewpoints.

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2H-2/1

1500 sq ft • Two-Story

Starting at $600k

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Snapshots

Vignettes of Variety

When you walk into a lime-plaster room and experience it, it just feels different.

Your sustainable, sturdy, serene sanctuary.
HEXOHM home will feel like a carefully considered bio-castle.

Brawny Building

Outside, a HEXOHM looks stout yet elegant.
The structural concrete corner pillars suggest its formidable strength, and the hexagonal footprint makes it appear more stable than a rectilinear building.
Entering through the doorway, it’s impossible to not appreciate the 14” thick walls. The impressive exposed-beam ceiling pattern further emphasizes the substantial sturdiness of the structure.

Cozy Castle

Inside, one is immediately swaddled in becalming silence.
The solidity that only mass-buildings can provide is palpable. The abundance of real-wood elements, finished in natural oils, lend a honey-like warmth.
Satin, subtly variegated plaster finishes have a relaxing affect; they exude a stony presence (truly limestone), far elevated beyond paint.

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Bright
An abundance of warm, diffuse, dimmable, glowing light. You can live in a lantern :–)

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Grounded
A feeling of connectedness to the Earth is thanks to the ‘earthen’ slab ground floor.

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Cozy
With its high-thermal mass, the heated slab gently + evenly heats the entire dwelling. Romantic ;–)

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Quiet
The absence of reverberation creates an acoustic intimacy; a sense of being held by the space. Outside noise fades away.

The thick walls give a 'sense of shelter'. There’s a real serenity in it that is powerful.

HEXOHM is a versatile, efficient building system.
With each 500 square foot hexagonal pad, increasing permutations are possible.

HEXAGONAL PERMUTATIONS

Build out. Build up.

Go big or go small, and go home :–)
Stack 'hextions' up to three-storeys high, allowing interesting arrangements + useable roof decks.

Old-World meets High-Tech

HEMPXAGON is a fusion of timeless + pioneering materials + methods.
The result: a cozy, becalming space of pure form + honest structure, elevated with modern accuracy + efficiencies.

LIVING MACHINE

A house is an extension of our human life-support systems, a ‘machine for living’ according to the legendary Le Corbusier.
Inline with our ‘futu-rustic’^™ approach, we utilize modern technologies in the most cleverly simplistic ways possible.
The result: a low-tech, high-performance living-machine with minimal components + systems.

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Heating + Cooling

Radiant Heat

• Efficient, stable, uniform heat
• Cozy underfoot

Cooling

• Cooling via stack effect (apex ventilation)
• Can operate in passive or force-air modes

Air Quality

• Heat-recovery ventilation (fresh-air, minimal energy-loss)
• Filtration options for the imminent fire season

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PLUMBING

Hot Water

• Heat-pump hot water (300% efficient)
• Short water lines from tank, minimizing loss
• Point-of-use heating (if/where applicable)

Hybrid System

• The specialized storage tank does double-duty by providing radiant heat + domestic hot water
• Outside compressor unit, reducing noise

Copper/PEX Hybrid

• No PEX at fixtures for drinking
• PEX for installation efficiency

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ELECTRICAL

Lighting

• Low-Voltage, dimmable DC light fixtures
• High Color-Rendering-Index (CRI) luminaries
• Warm-neutral white light (2700-4000K)
• Strategic task, accent, and path lighting
• Integrated soft ambient lighting
• Dimmable, always

Future-Proof

• Solar-Panel (photovoltaic) ready
• Electric-Vehicle charger hook-up ready

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Serviceability

HEXOHM is designed with a home’s inevitable service + maintenance needs in mind.

Plumbing + Electrical

• Pipes + wires are accessible non-destructively.
• The utility closet is compact and laid-out logically + meticulously.

Finishes

• Plaster is easily spackled – a premixed tub will stay spreadable indefinitely.
• Natural oils on exposed woods can easily be reapplied without stripping prior.

A powerful shape, for reasons both practical + profound: the humble hexagon.

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A Special Shape
The significance of a hexagon lies in its connection to two fundamental shapes: the circle, and the triangle, the latter of which is an incredibly strong shape, used extensively in bridges, cranes, skyscrapers etc.

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The Great Tesselate
Thanks to its close relationship to the circle (google ‘circle packing’), hexagons are able to be ‘tiled’ indefinitely, just like the almost magical Apian honeycomb.
This tidy clustering gives us sizing + layout options for structures + sites.

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More With Less
Polygons have an increasing area-to-perimeter ratio with added sides, up to infinity (circle).
The 3 shapes below have the same amount of exterior wall (the most expensive + complex part of a house), but the hexagon unlocks more than 15% extra floor area compared to a boring square.

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Different, But Familiar
Don’t worry; it’s not too atypical a shape for a structure, unlike a yurt (2D circle) or dome (3D circle), which makes for challenging/awkward placement of furniture, shelving, and artwork.
Like boxy structures, our homes have straight, plumb, parallel walls… just an extra pair!

In Nature

Hexagons are a common shape found throughout nature due to their efficiency + structural stability. They are present in both living + non-living systems, from the microscopic structure of snowflakes to massive formations of basalt columns.

Hex-Fun

Links to visit

“You cannot lead by following.”

- Christian von Koenigsegg

We build in a unique, efficient, low-waste way.
Our innovative + proprietary co-molding slip-former is our secret-sauce, enabling accuracy, consistency, + speed.

Less Noise + Site Traffic

Efficient Timelines

High-Precision

Minimal Waste

With new things come new curiosities.

Is hempcrete a good insulator?
Well, duh. It is an excellent sustainable insulator that combines thermal insulation with thermal mass, offering a breathable, mold-resistant, and carbon-sequestering building material. Several studies examining the hygrothermal performance of hempcrete have shown that actual performance of hempcrete insulation far exceeds the predictions made by R-value.

What are the benefits of thermal mass?
It keeps buildings warm in winter and cool in summer by absorbing + storing heat and releasing it slowly, providing stable indoor temperatures and enhancing building energy efficiency, reducing heating/cooling costs. It moderates internal temperatures to improve comfort, and manages temperature fluctuations, especially in climates with high day-night temperature swings.

How are hempcrete buildings carbon-negative?
Hempcrete is carbon-negative because the industrial hemp plant absorbs significant CO2 during its rapid 4-6 month growth phase, sequestering roughly 100-300 kg of CO2 per cubic meter, which exceeds the carbon emissions produced by harvesting and processing. It locks this carbon into the building structure, with the lime binder continuing to absorb CO2 while curing.

How is hempcrete mold-proof?
Mold (any biological growth) can’t grow without moisture. Thus, mold growth on hempcrete is inhibited because the hempcrete can dry quickly because of its permeability. The addition of the proper lime plaster will greatly assist with this wicking out the moisture. Also, due to its high pH balance, lime acts as a natural combatant against mold and fungus and, in addition, is an antimicrobial material.

How is hempcrete pest-proof?
Small, cute, furry animals cannot penetrate the dense structure of hempcrete, making it naturally pest-resistant. The alkaline nature of the lime plaster also deters rodents + insects. A study by the University of Hawaii showed that given no other options, Formosan termites would consume hempcrete but have a subsequent mortality rate of 91%.

Is a hempcrete building air-tight?
While hempcrete is vapor permeable and can ‘breathe’ to both the interior and exterior of the building, it can also be extremely airtight. The monolithic nature of hempcrete reduces the potential of many of the weak spots found in other methods. In fact, a hempcrete structure with no formal air control layer had even less air permeability than the value targeted by the stringent Passivhaus specs.

How does a hempcrete wall 'breathe'?
Hygroscopy is the ability of a substance to hold and attract water molecules from the environment. The vascular bundles in hurd greatly increase its surface area, enhancing its vapor region capability. As part of the wall system, lime mitigates changes in the internal environment and provides a buffer between differences in internal and external humidity. Water is bound within the lime and may be held indefinitely without negative effect on the material. It is released when the surrounding humidity decreases.

How does a hempcrete wall handle lots of water?
Water spray testing was carried out on hempcrete walls to explore the ability of hempcrete to handle high moisture loads. "Over the spray period of 96 hours the test walls were sprayed with a minimum of one year's wind-driven rain similar to that at a severely exposed location, or 5 years at a less exposed site." The results showed no penetration of water into the hempcrete after two hours, and limited penetration of ¾ to 1½ inches after 24 hours. After the full 96 hours, water penetration was just 2 to 2¾ inches. Given the ability of hempcrete to dry out quickly and resist the onset of mold or rot (due to the presence of the lime binder), this seems to indicate that direct-plastered hempcrete is sufficient water control in all but the worst climatic conditions.

What kind of maintenance is required for hempcrete?
Hempcrete is a very low-maintenance, durable, and breathable material with a lifespan exceeding 100 years, requiring minimal upkeep :–)

How does plaster differ from stucco?
They can be used interchangeably, but stucco typically implies being cement-based, while HEXOHM utilizes traditional lime-based plaster, offering several benefits; breathabilty, lighter-weight, innate flexibility, significantly (80%) less embodied carbon.

Is hempcrete the same as hemp-lime?
Yup, same wonderful building material.

Is it really fire-proof?
Well, anything (diamond, tungsten, kryptonite...) can burn at high enough temperature, so it's technically extremely fire-retardant. But, it's pretty darn impressive stuff, able to withstand direct flame for hours.

Is hempcrete getting popular in the US?
Yes, in a big way since the adoption of hmepcrete into the 2024 International Residential Code. Hempcrete has been around for over 40 years in Europe + Asia, thoroughly tested and proven effective in various climatic conditions. Check out some of these recent headlines:

Is hempcrete permittable in the building code?
Yes indeed :–) As of the 2024 miletsone, hempcrete is officially part of the International Residential Code. Presecripitve materials and processes are outlined.

“We must be decisive and proactive, and become staunch advocates for making decisions that have a net-positive effect, rather than simply doing less harm.”

- Justin R. Wolfe

Hempcrete Homes

Hempcrete Momentum

Research + Development

Good Stuff

Plant Power

HEXOHM is headquartered on beautiful Bainbridge Island. We are a lean (but not mean) company, humbly working to change the world a bit towards the better.

We are two guys with some European blood running through our veins, and that pulls us to look at buildings from a world perspective – to be efficient, conscious of its environment, and deliberate in our choices. We decided to put our heads together in 2021 to figure out how we could build structures with our desires and values front and center.

As a team, Matt + Klaas are well balanced to design and innovate possibilities for our eco-friendly homes. Matt Carrig, with the design sensibilities of an Italian artist, has years of experience working in the architecture and design fields, as well as pursuing functional art pieces. Klaas Hesselink has a practical and thoughtful Dutch outlook, with strengths as a skilled and intuitive builder, with years of remodeling houses and building furniture.

For several years we’ve been diving deep into material science, getting hands-on experience with hemp-lime, plasters and the engineering side of building a natural house in a seismic zone. Along the way, we are forming alliances with experienced and passionate natural builders and engineers.

Beside all of that, we are two regular dudes who would love to collaborate and build the best house for you.