Cozy Homes for a Healthier Planet

Explore our collection of modern straw bale homes and accesory dwelling units – compact, efficient, and naturally designed.

CRAFTED WITH NATURAL MATERIALS

A Focus on Locally Sourced Living

Our Casitas redefine regenerative living. Built with locally sourced Vermont wood and straw, your Casita home is as resilient as it is contemporary in design. Personalize your interior with an optional natural clay and lime plaster finish, and embrace the healthy living environment created by sleek, non-toxic wood finishes.

We prioritize climate-friendly living and comfort, integrating advanced heating, cooling, ventilation, water, and power systems that are fossil-fuel free and all-electric. Off-grid options also available. Discover a new era of modern accessory dwelling units.

Browse our six different Casita models below.

Take a 3d tour of our Standard Terra 600 Casita

Take a 3d tour of a Custom Árbol 1200 Casita

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Exterior shot of the Cabañita, a 300SF prefab adu kit.

Our Casitas

Read about our six models of prefabricated ADU and home kits

COMFORTABLE PRIMARY RESIDENCE

Árbol 1200

The spacious Árbol 1200 boasts 1200 square feet of conditioned living space, 3 bedrooms, an impeccably designed full kitchen and 1.5 bath, and advanced mechanicals.

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A 3D rendering of our 1200 SF prefab two story home kit.

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A 3D rendering of our 1200 SF prefab two story home kit.

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Mudroom and hallways of our 1200 SF prefab two story home kit.

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Bedroom depiction of our 1200 SF prefab two story home kit.

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Depiction of the bedroom in our 1200 SF prefab two story home kit.

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The kitchen in our 1200 SF prefab two story home kit.

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Another view of the kitchen in our 1200 SF prefab two story home kit.

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The view of the loft in our 1200 SF prefab two story home kit.

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Office/flex space in our 1200 SF prefab two story home kit.

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View from the loft in our 1200 SF prefab two story home kit.

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First-floor floor plan of the Árbol 1200 prefab two story ADU kit.

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2nd-floor floor plan of the Árbol 1200 prefab two story ADU kit.

In addition to the features included in all Casitas, the Árbol 1200 uniquely features:
- Approximately 1200 square feet of interior living space
- (1) 1st floor bedroom
- (2) 2nd floor bedrooms
- 2nd floor office/flex space, and under-eave storage space
- Full kitchen
- Swing door for bathroom for increased privacy
- Open-concept dining-living area with cathedral ceiling
- Full L-shaped stairs with landing
- Under-stair storage space
- 2 entrances: one single door entrance with covered stoop, and a single door and adjacent window for natural lighting and covered-porch access.
- Mudroom entrance space provides an organized portal in and out of your home
- Storage closets
All of our Casitas are built using straw- and Timberfill™ high-performance structural insulated panels and can be installed in a matter of weeks. Each enclosure system is designed to be airtight and vapor-open, supporting long-term durability, healthy indoor air quality, and strong thermal performance. With approximate R-values of R-38 at the walls, R-55 at the floors, and R-60 at the roof, these homes significantly exceed code-minimum requirements and can be readily detailed to meet Passive House certification standards.
Because high-performance, air-sealed homes require intentional ventilation, Casita kits are integratively designed to specify either energy recovery ventilators (ERVs) or heat recovery ventilators (HRVs), depending on the size and needs of the unit, ensuring excellent indoor air quality and comfort.
The Árbol was inspired by the beloved features of the Flora model. It was created in response to customer requests for a larger, single-family home that builds on those cherished elements.

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Casitas FAQ

Please note that this 3D tour was created using a customized version of our standard Árbol 1200 unit, and not all features shown are included in the standard model.

SPACIOUS LIVING BLOSSOMS

Flora 900

The opulent Flora 900 boasts 900 square feet of conditioned living space, an impeccably designed full kitchen and bath, and advanced mechanicals.

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A 3D rendering of our 900SF two-story prefab home or ADU kit.

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1st floor plan of our 900 SF prefab ADU or home kit.

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2nd floor plan of our 900 SF prefab two story home or ADU kit.

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A 3D rendering of the bedroom in the Flora, our 900 SF two story prefab home or ADU kit.

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A 3D rendering of the living room in the Flora, our 900 SF prefab two story home or ADU kit.

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A 3D rendering of the living room in the Flora, our 900 SF two story prefab home or ADU kit.

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A 3D rendering of the kitchen in the Flora, our 900 SF two story prefab home or ADU kit.

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A 3D rendering of the stair case and living room in the Flora, our 900SF, two story prefab home or ADU kit.

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A 3D rendering of the mud room and living room in the Flora, our 900SF, two story prefab home or ADU kit.

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A 3D rendering of the loft in the Flora,our 900SF, two story prefab home or ADU kit.

In addition to the features included in all Casitas, Flora 900 uniquely features:
- Approximately 900 square feet of interior living space
- 1st floor bedroom
- 1st floor bathroom
- Optional 2nd floor bedroom
- Optional 2nd floor bathroom
- Full kitchen
- Swing door for bathroom for increased privacy
- Open-concept dining-living area
- Full L-shaped stairs with landing
- 2 entrances: one single door entrance with covered stoop, and a single door with adjacent window for natural lighting and covered-porch access
- Mudroom entrance space provides an organized portal in and out of your home
- Storage closets
- Loft with sleeping space, optional home working space, and under-eave storage space, or additional bedroom and bathroom.
All of our Casitas are built using straw- and Timberfill™ high-performance structural insulated panels and can be installed in a matter of weeks. Each enclosure system is designed to be airtight and vapor-open, supporting long-term durability, healthy indoor air quality, and strong thermal performance. With approximate R-values of R-38 at the walls, R-55 at the floors, and R-60 at the roof, these homes significantly exceed code-minimum requirements and can be readily detailed to meet Passive House certification standards.
Because high-performance, air-sealed homes require intentional ventilation, Casita kits are integratively designed to specify either energy recovery ventilators (ERVs) or heat recovery ventilators (HRVs), depending on the size and needs of the unit, ensuring excellent indoor air quality and comfort.
Click to view the BEAM model.

Click to see the overview flyer

Request a Casita Quote

Casitas FAQ

SPACIOUS SINGLE STORY LIVING

NEW! - Toro 900

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A 3D rendering of the exterior of the Toro 900SF prefab ADU or home kit.

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The floor plan of the Toro 900SF prefab ADU or home kit.

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A 3D rendering of a half-bathroom in the Toro 900SF prefab ADU or home kit.

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A 3D rendering of an add/alt (optional) full bathroom in the Toro 900SF prefab ADU or home kit.

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A 3D rendering of a full bathroom in the Toro 900SF prefab ADU or home kit.

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A 3D rendering of ta bedroom in the Toro 900SF prefab ADU or home kit.

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A 3D rendering of a bedroom in the Toro 900SF prefab ADU or home kit.

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A 3D rendering of a bedroom in the Toro 900SF prefab ADU or home kit.

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A 3D rendering of the dining/living area in the Toro 900SF prefab ADU or home kit.

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A 3D rendering of the dining/living area in the Toro 900SF prefab ADU or home kit.

The Toro 900 offers approximately 900 square feet of conditioned living space in a thoughtfully designed single-story layout. Well-suited for mixed-use needs, multi-generational living, or aging-in-place, the Toro supports flexibility across many life stages. With two bedrooms and one-and-a-half bathrooms on the main floor, along with a generous kitchen and living area, this home is designed to adapt to a wide range of households and ways of living.

In addition to the features included in all Casitas, the Toro 900 uniquely features:
- Approximately 900 square feet of interior, single-story living space, plus covered-porch
- 2 bedrooms
- 1.5 bathrooms
- Full kitchen
- Base design that can be easily altered to meet ADA requirements
- Open-concept dining-living area
- Mudroom entrance space provides an organized portal in and out of your home
- Storage closets
- Intentionally designed natural lighting
All of our Casitas are built using straw- and Timberfill™ high-performance structural insulated panels and can be installed in a matter of weeks. Each enclosure system is designed to be airtight and vapor-open, supporting long-term durability, healthy indoor air quality, and strong thermal performance. With approximate R-values of R-38 at the walls, R-55 at the floors, and R-60 at the roof, these homes significantly exceed code-minimum requirements and can be readily detailed to meet Passive House certification standards.
Because high-performance, air-sealed homes require intentional ventilation, Casita kits are integratively designed to specify either energy recovery ventilators (ERVs) or heat recovery ventilators (HRVs), depending on the size and needs of the unit, ensuring excellent indoor air quality and comfort.
Click to view the BEAM model.

Request a Casita Quote

Casitas FAQ

GROUNDED ELEGANCE WITH LOFTY LIVING

Terra 600

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A detailed 3D rendering of the Terra, our 600SF, two story prefab home or ADU kit.

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A detailed 3D rendering of the exterior of the Terra, our 600SF, two story prefab home or ADU kit.

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First floor plan of the Terra, our 600 SF, two story prefab home or ADU kit. ,

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2nd story floor plan of the loft in the Terra, our 600SF, two story prefab home or ADU kit.

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A 3D rendering of the living room in the Terra, our 600SF, two story prefab home or ADU kit.

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A 3D rendering of the living room and hallway in the Terra, our 600SF, two story prefab home or ADU kit.

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A 3D rendering of the living room and kitchen in the Terra, our 600SF two story prefab home or ADU kit.

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A 3D rendering of the loft in the Terra, our 600SF two story prefab home or ADU kit.

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A 3D rendering of the storage loft in the Terra, our 600SF, two story prefab home or ADU kit.

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A 3D rendering of the mudroom in the Terra, our 600SF, two story prefab home or ADU kit.

Our elevated Terra 600 offers approximately 600 square feet of conditioned living space, featuring a loft, a fully designed kitchen and bath, and advanced mechanicals, electrical, and plumbing.

In addition to the features included in all Casitas, Terra 600 uniquely features:
- Approximately 600 square feet of interior living space
- Full kitchen
- Swing door for bathroom for increased privacy
- Open-concept dining-living area
- Full L-shaped stairs with landing
- Under-stair built in shelving for integrated storage
- 2 entrances: one single door entrance with covered stoop, and a single door entrance with adjacent window for natural lighting and covered-porch access
- Mudroom entrance space provides an organized portal in and out of your home
- Storage closets and built in shelving
- Loft with sleeping space, optional home working space, and under-eave storage space
All of our Casitas are built using straw- and Timberfill™ high-performance structural insulated panels and can be installed in a matter of weeks. Each enclosure system is designed to be airtight and vapor-open, supporting long-term durability, healthy indoor air quality, and strong thermal performance. With approximate R-values of R-38 at the walls, R-55 at the floors, and R-60 at the roof, these homes significantly exceed code-minimum requirements and can be readily detailed to meet Passive House certification standards.
Because high-performance, air-sealed homes require intentional ventilation, Casita kits are integratively designed to specify either energy recovery ventilators (ERVs) or heat recovery ventilators (HRVs), depending on the size and needs of the unit, ensuring excellent indoor air quality and comfort.
Click to view the BEAM model.

Click to see the overview flyer

Request a Casita Quote

Casitas FAQ

Tour the Terra 600, virtually, below:

SINGLE FLOOR SERENITY

Agua 400

Experience the convenience of universal design and single-story living, all on a low-carbon concrete slab foundation or pier foundation with ramp for barrier-free entrance. Revel in approximately 400 square feet of conditioned living space, boasting a fully designed kitchen, complete bathroom, and top-tier mechanical, electrical, and plumbing features.

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Exterior 3D rendering of the Agua, our 400SF prefab ADU kit.

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A detailed 3D rendering of the bedroom inside the Agua, our 400SF prefab ADU kit.

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A detailed floor plan of the Agua, our 400SF prefab ADU kit.

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A detailed building section of the Agua, our 400SF prefab ADU kit.

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3D rendering of the living room in the Agua, our 400 SF prefab ADU kit.

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A detailed 3D rendering of the Agua, our 400SF prefab ADU kit.

In addition to the features included in all Casitas, Agua 400 uniquely features:
- Approximately 400 square feet of interior living space, plus covered porch
- Storage closets
- Swing door for bathroom for increased privacy
- Base design that can be easily altered to meet ADA requirements
All of our Casitas are built using straw- and Timberfill™ high-performance structural insulated panels and can be installed in a matter of weeks. Each enclosure system is designed to be airtight and vapor-open, supporting long-term durability, healthy indoor air quality, and strong thermal performance. With approximate R-values of R-38 at the walls, R-55 at the floors, and R-60 at the roof, these homes significantly exceed code-minimum requirements and can be readily detailed to meet Passive House certification standards.
Because high-performance, air-sealed homes require intentional ventilation, Casita kits are integratively designed to specify either energy recovery ventilators (ERVs) or heat recovery ventilators (HRVs), depending on the size and needs of the unit, ensuring excellent indoor air quality and comfort.
Click to view the BEAM model.

Click to see overview flyer.

Request a Casita Quote

Casitas FAQ

PETITE PERFECTION

Cabañita 300

Meet the Cabañita 300, where miniature elegance blossoms in 314 square feet of contemporary living space. Upgrade to the Cabañita Plus to include a bathroom.

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3D rendering of the Cabañita Casita, our 300SF two story prefab ADU kit.

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First floor plan of the Cabañita, our 300 SF, two story prefab home or ADU kit.

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A detailed floor plan of the Cabañita+, our 300 SF, two story prefab home or ADU kit.

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Interior loft floor plan of the Cabañita, our 300 SF, two story prefab home or ADU kit.

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Interior first floor of the Cabañita, our 300 SF, two story prefab home or ADU kit.

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3D rendering of the Cabañita, our 300 SF, two story prefab home or ADU kit.

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3D rendering of the interior first floor of the Cabañita, our 300 SF, two story prefab home or ADU kit.

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3D Rendering of the Cabañita+, our 300 SF, two story prefab home or ADU kit.

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3D rendering of the Cabanita+, our 300 SF, two story prefab home or ADU kit.

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3D rendering of the Cabañita, our 300 SF, two story prefab home or ADU kit.

In addition to the features included in all Casitas, Cabañita 300 uniquely features:
- 314 square feet of interior living space, plus covered porch
- Alternating tread stair (code compliant)
- Pocket door for bathroom for space-saving, functional ease
All of our Casitas are built using straw- and Timberfill™ high-performance structural insulated panels and can be installed in a matter of weeks. Each enclosure system is designed to be airtight and vapor-open, supporting long-term durability, healthy indoor air quality, and strong thermal performance. With approximate R-values of R-38 at the walls, R-55 at the floors, and R-60 at the roof, these homes significantly exceed code-minimum requirements and can be readily detailed to meet Passive House certification standards.
Because high-performance, air-sealed homes require intentional ventilation, Casita kits are integratively designed to specify either energy recovery ventilators (ERVs) or heat recovery ventilators (HRVs), depending on the size and needs of the unit, ensuring excellent indoor air quality and comfort.
Click to view the BEAM model.

Click to see overview flyer for 300

Click to see overview flyer for 300+

Request a Casita Quote

Casitas FAQ

Step into a Casita and feel what it means to be held by a home.

Throughout the year, we host tours of our local Casita models at various stages in the construction process so you can explore the thoughtful details, the variety of models and designs, and imagine what's possible when homes are built with care, intention, and love for this earth.

Tour a Casita

Why Casitas?

Our mission with the Casitas is to help bridge the gap in accessible, sustainable housing by bringing thoughtfully designed homes and ADUs to the missing middle—those too often left out of high-performance building conversations. Every Casita is crafted to be healthy and non-toxic, fully electric for a fossil-fuel-free future, and made with carbon-storing materials that actively support climate resilience. We're building for the folks who want their homes to reflect care for their bodies, their communities, and the planet.

Casitas FAQ

Two packages for Casita Kits:

Our starting prices for Casita kits range from $58,900 - $152,500, with options for additional or alternative selections at extra cost.
Shipping costs can be estimated by requesting a Casita quote.
We can ship our Casita (prefab small home and ADU) kits anywhere in continental North America.
With a Casita Kit, you’re purchasing a ready-to-assemble high performance building enclosure.
See more details in What’s included in a Casita Kit.

Kit-Only

Photo of the Cabañita 300 prefab adu kit being installed in Burlington, VT

Our pricing for kit installation is $15-$24/SF.
Installation and shipping costs vary by site. Please request a Casita quote for more information.
Generally we can install Casita kits anywhere within 2 hours of any of our Seed Collaborator offices in Essex Junction, Vermont; Easthampton, MA; Baltimore, MD; Columbia, MO; Arvada, CO; and Bellingham, WA, with more offices coming online in 2026.
Beyond What’s Included in a Casita Kit, the installation package includes assembly of the building enclosure, complete with a layer of Solitex Adhero (Weather Resistant Barrier).