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Rainwater Harvesting and Bahareque Construction in a Coastal Home

Author:
Juan jose Murillo-matamoros
Rainwater Harvesting and Bahareque Construction in a Coastal Home

Project in-detail

Constructed with bahareque and featuring integrated rainwater harvesting systems, the coastal home adapts to its environment while providing sustainable living solutions for its occupants.
5 key facts about this project
01
Constructed with locally sourced bahareque to support sustainability.
02
Features awning windows that serve as rooftops to protect against rain.
03
Incorporates a rainwater harvesting system on the South facade.
04
Utilizes natural ventilation strategies to optimize indoor comfort.
05
Designed to withstand the climatic challenges of Chira Island.

Nimbu House, located in Chira Island, Costa Rica, showcases a blend of cultural heritage and environmental care. The name comes from the Chorotega word for rain, reflecting the local history. The design uses natural ventilation and shading to create a comfortable living space that meets the needs of its inhabitants while respecting the island's climate.

Design Concept

The design emphasizes the use of natural elements to create a well-functioning home. Windows are placed deliberately to capture light and air; the North and South sides feature casement windows, allowing residents to control sunlight and temperature inside. The West and East facades use awning windows that serve as small roofs, protecting against rain and direct sunlight, which enhances the indoor comfort.

Material Selection

The house is built with bahareque, a traditional material made from soil and guadua bamboo. This choice reflects local building customs and offers a practical, sustainable method of construction. Using bahareque highlights the desire to connect with the surrounding environment and support local resources, thereby reducing the overall ecological impact.

Sustainability Features

Sustainability plays an important role in the overall design. Nimbu House includes a rainwater harvesting system on the South side, promoting efficient use of water. Solar panels are also integrated into the project, enabling off-grid living by making use of renewable energy in this remote location. These features demonstrate a commitment to living in harmony with nature while providing a functional space for daily life.

The design fosters a dialogue between inside and outside, creating a light-filled atmosphere. The careful placement of windows allows natural light to play across the interior spaces. This enhances both the aesthetic quality and the livability of Nimbu House, inviting the environment into the daily experiences of its residents.

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MICROHOME 10: Celebrating Small-Scale Living with €100,000 Prize Fund and Kingspan’s Innovation

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Competition organisers

The MICROHOME 10 competition invites participants to submit visionary designs for off-grid, modular microhomes that push the limits of sustainable, small-scale living. Organised by Buildner in partnership with Kingspan and Hapi Homes, this tenth edition sets the challenge of designing a dwelling for two people within a maximum floor area of 25 m², encouraging bold solutions adaptable to any urban or rural location. The competition continues Buildner’s mission to foster innovative approaches to compact, energy-efficient housing that can address pressing global challenges.

This year’s edition offers a generous total prize fund of €100,000, including the Kingspan Award for designs that integrate high-performance Kingspan products and the Hapi Homes Award for a project selected for real-world construction. In addition to cash prizes, the winners gain international exposure through Buildner’s media partnerships, publications, and a dedicated MICROHOME magazine, further amplifying their ideas to the wider architectural community.

Key dates for MICROHOME 10 include the closing date for registration on 25 September 2025, the submission deadline on 29 October 2025 (11:59 p.m. London time), and the announcement of winners on 9 December 2025. These milestones ensure participants have clear timelines to develop and present their concepts, with early registration discounts available to support students and emerging designers worldwide.

MICROHOME

Design a new small-scale home concept in the 10th edition of MICROHOME — 100,000 € prize + construction

100,000 € Prize Fund / Kingpsan Edition #10 ideas COMPETITION
Prize 100,000 € + Potential realisation
Eligibility Open to all
Final registration deadline 25 September 2025

Enter an open architecture
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