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Graywater Recycling in a Compact Living Space with a Tankless Heater

Author:
Emma Haukom
Graywater Recycling in a Compact Living Space with a Tankless Heater
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Incorporating graywater recycling and a tankless heater, this compact living space efficiently addresses housing affordability while providing essential amenities for modern living.
5 key facts about this project
01
Incorporates a rolling ladder for efficient access to vertical spaces.
02
Features a dual-purpose Murphy bed that functions as a workspace.
03
Utilizes graywater recycling for sustainable water management.
04
Equipped with a tankless electric water heater for energy efficiency.
05
Includes a greenhouse area promoting home gardening and composting.

Cottage Core is an initiative that seeks to tackle the important issue of housing affordability for lower and middle-class families. Situated in an urban environment where such living options are limited, the design focuses on creating a compact and useful space. It is framed as an “indoor fort for a fixer-upper,” which highlights its flexibility and adaptability as essential aspects of its overall concept.

Functionality

The design prioritizes functionality by including essential areas for cooking, working, sleeping, and relaxing within a small area. A Murphy bed serves dual purposes, acting as both a sleeping space and a desk, enabling efficient use of the limited living space. Alongside this, a built-in closet provides necessary storage without taking away from the overall room. The kitchen is well-equipped and features extendable counter space to support various cooking tasks, emphasizing how practical and user-friendly the design is.

Sustainability

Sustainability plays a significant role in the overall design. The structure includes a tankless electric water heater and an electric generator, both of which support energy efficiency. An air-sealed utility connection box with a flashing membrane and solar panels enhance energy management as well. These features reflect a clear intention to minimize environmental impact while meeting the needs of modern living.

Water Management

Effective water management solutions are also a key focus of Cottage Core. The dwelling is designed with water storage options, promoting conservation and efficient use of resources. There is a system for collecting graywater, which can be reused for irrigation, helping to create a self-sufficient living environment. This attention to water management aligns with ecological principles and underscores the aim of fostering more sustainable practices within residential living.

Greenhouse Component

A notable aspect of Cottage Core is its greenhouse that includes composting capabilities, reinforcing the idea of sustainable living. This encourages residents to grow their own food, further supporting environmental responsibility. By combining opportunities for gardening with the living space, Cottage Core fosters a meaningful connection between people and their environment, promoting both independence and community involvement.

Finished with practical design elements, such as a rolling ladder for accessing entertainment spaces, Cottage Core offers a thoughtful response to the challenges of modern housing. It emphasizes adaptability and sustainability, creating a living environment that is both functional and aware of its ecological footprint.

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The Next House: USA — A Global Call to Reimagine the American Suburb

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Competition organisers

Buildner is launching The Next House: USA, a global architecture competition that challenges architects, designers, and thinkers to reimagine the American suburban home for the 21st century. For decades, the suburban house has symbolized comfort and stability, but today it often reflects excess, isolation, and environmental strain. This competition asks: how can the American home evolve to address climate urgency, economic pressures, and shifting social values?

Participants are tasked with designing a prototype home of no more than 1,500 sq ft (≈140 m²) for a household of two adults and one child. The design should be compact yet generous, adaptable, sustainable, affordable, and replicable across diverse U.S. contexts. More than a design exercise, the competition aims to spark a conversation about how homes can support healthier, smarter, and more connected communities.

The total prize fund is $20,000 USD. The final registration deadline is May 20, 2026, and winners will be announced on September 22, 2026. The Next House: USA invites architects, students, and visionaries worldwide to redefine what the American home means today—and what it should mean tomorrow.

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Prize Monetary award
Eligibility Open to all
Early bird registration deadline 19 November 2025

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