Mighty House Development

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Mighty House Development

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City Cabins at Little City Farms

City Cabins at Little City Farms

City Cabins at Little City Farms marks our first single-family land condominium development project — a thoughtful reimagining of a once-overlooked urban site into a small community rooted in sustainability, healthy living, and intentional design. 


The “house” on this site was originally built as a farm animal barn on a 3-lot apple orchard. The converted barn lacked stable craftsmanship and had to be carefully removed to make way for three modern homes, a main dwelling, an ADU, and a DADU, designed to enrich the neighborhood while honoring the site’s humble history.


This project reflects our belief that building better means creating homes that are not only energy-efficient and durable, but also healthier, more resilient, and more connected to the people who live in them. From advanced “smart” building envelope systems and all-electric heating solutions to low-toxicity interior finishes and high-performance ventilation, every detail of City Cabins at Little City Farms was selected to support long-term sustainability, comfort, and wellbeing.

8627 30TH AVE SW, Seattle, WA 98126

8625 30TH AVE SW, Seattle, WA 98126

8623 30TH AVE SW, Seattle, WA 98126

A “Smart” Building Envelope

Healthy Home Insulation

Smart Weather Resistant and Vapor Barriers

Healthy Home Insulation

A “smart” building envelope is crucial for a home’s long-term health. Every layer, from the exterior siding to the interior sheetrock, plays a vital role in the overall effectiveness of the envelope. In the core of our system is Rockwool insulation, made from spun basalt rock and recycled steel slag it has a lower overall carbon footprint than fiberglass and excels in heat retention, moisture control, mold and fire resistance, and soundproofing. 

Composite Windows

Smart Weather Resistant and Vapor Barriers

Healthy Home Insulation

All walls are air-sealed and fitted with vapor permeable smart membranes on both the interior and exterior to enhance energy performance while also allowing moisture to escape rather than get trapped. The exterior is clad in fiber cement board, a highly durable material with a lifespan over 40 years, minimizing maintenance and replacements.

Smart Weather Resistant and Vapor Barriers

Smart Weather Resistant and Vapor Barriers

Smart Weather Resistant and Vapor Barriers

Andersen’s 100 Series windows are made from Fibrex, a composite material that blends reclaimed wood waste from other window styles with polymers making Fibrex twice as strong as and more resistant to UV damage as vinyl, as well as superior in heat retention, moisture resistance, fire resistance, and soundproofing.

Systems

“Hybrid” Hot Water

Electric, Ducted Heat Pump System

Electric, Ducted Heat Pump System

Air-source heat pump technology is one of the most efficient methods to heat water. These Energy Star certified hot water heaters are considered a “hybrid” solution – as they are wifi-enabled with 5 operation modes — from the most energy efficient heat-pump only mode to standard electric resistant — to allow easy adjustments for the varying demands of home. Also provides audio and wifi alerts for leak detection or service needs.Every layer, from the exterior siding to the interior sheetrock, plays a vital role in the overall effectiveness of the envelope. In the core of our system is Rockwool insulation, made from spun basalt rock and recycled steel slag it has a lower overall carbon footprint than fiberglass and excels in heat retention, moisture control, mold and fire resistance, and soundproofing. 

Electric, Ducted Heat Pump System

Electric, Ducted Heat Pump System

Electric, Ducted Heat Pump System

Air-source heat pumps harness heat from the outside air and transfer it indoors, operating up to 3 to 5 times more efficiently than traditional fuel-based systems. By moving heat rather than generating it, heat pumps can maintain optimal indoor temperatures, as all air—whether hot or cold— contains heat. Powered entirely by electricity, heat pumps are an excellent energy source to pair with solar power, making them a sustainable choice for heating and cooling.

HRV

Electric, Ducted Heat Pump System

Infrared Radiant Ceiling Panels

A Broan Heat Recovery Ventilator (HRV) is an energy-efficient air exchange system that transfers heat from outgoing air to incoming fresh air, reducing heating and cooling load. It’s Energy Star certified and boasts high efficiency, with some models reaching 80%. Additionally, Broan HRVs offer MERV 13 filtration, providing improved air quality by filtering out dust, pollen, and other airborne particles.

Infrared Radiant Ceiling Panels

Ventless Inverter Washer and Dryers

Infrared Radiant Ceiling Panels

The 8625 unit is heated by an electric infrared coil, these units radiate energy down — heating the people and objects in the room directly. Spaces warm up faster & stay warm longer with/ very little electricity. Zero duct work or maintenance needed. Dist. by MightyEnergy.net.

Ventless Inverter Washer and Dryers

Ventless Inverter Washer and Dryers

Ventless Inverter Washer and Dryers

Ventless inverter washer and dryers wash and dry clothes in a single machine without needing exterior exhaust venting. They utilize energy-efficient inverter heat pumps, operate on standard 120V outlets, and require only a cold water hookup and a drain.

Interior Features

Kitchen and Bath

Kitchen and Bath

Kitchen and Bath

  • Kitchen backsplash tile contains ≥40% pre-consumer recycled content
  • Stain- and Heat-resistant quartz countertops
  • Stainless steel shower niche shelves to mitigate edge chipping and staining
  • Tiled shower surrounds
  • Locally-produced Canyon Creek cabinetry

Flooring

Kitchen and Bath

Kitchen and Bath

  • Marmoleum (natural linoleum with jute backing) laundry floor
  • Välinge hardened white oak flooring
  • Tiled bathroom floors

Lighting & Extras

Kitchen and Bath

Lighting & Extras

  • Lots of natural light and supplemental 2700k LED lighting
  • Solatube Daylighting Systems
  • Wood window trim and doors provide a long-term carbon sink
  • Paints w/out Volatile Organic Compounds (VOCs)

Exterior Features

Native Plants

Rain gardens and Bioswales

Pervious Pavers

Pacific Northwest (PNW) native plants that are hardy, climate-adapted species that thrive in the region's wet winters and dry summers. They require less water and maintenance while supporting local pollinators.

Pervious Pavers

Rain gardens and Bioswales

Pervious Pavers

Pervious pavers are specially designed bricks, stones, or grid systems that allow rainwater to soak through the surface and into the ground below.

Rain gardens and Bioswales

Rain gardens and Bioswales

Rain gardens and Bioswales

We used rain gardens and bioswales to naturally manage stormwater runoff, helping filter pollutants, reduce erosion, and return cleaner water back into the environment while supporting native landscaping and habitat.

“City Cabins,” originated from Martha Rose Construction, were conceived as super energy-efficient homes designed to achieve Built Green certification and approach net-zero energy consumption. These homes incorporated water-saving technologies, low-impact development practices, regionally sourced materials, and independent third-party verification to ensure the integrity of their performance standards.


For the past 17 years, Mighty House Construction has shared a deeply aligned mission — designing and building healthy, durable, thoughtfully crafted homes for homeowners throughout Western Washington. In 2023, the owners, Laura and Doug expanded that mission into speculative homebuilding, with the goal of bringing the same level of quality, sustainability, and livability to the broader real estate market.


Recognizing this shared commitment and preparing to retire from building — truly this time — Martha Rose offered stewardship of the “City Cabins” trademark to Mighty House Construction.


This next chapter represents more than a transfer of a name. It is the continuation of a philosophy: that homes can be beautiful, resilient, environmentally responsible, and built to serve both people and place for generations to come.

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Contact us

Mighty House Development

West Seattle, Washington
mightyhousedev@gmail.com

(971) 249-2188




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