Carol and Ken’s home in Leura takes advantage of, and protects, the natural landscape. (Photo: Brett Boardman)
Story by Linda Moon
Ken and Carol’s home in Leura offers insights into sustainable building design we can all take inspiration from.
Key Points:
Most Blue Mountains homes aren’t built for the local environment.
Sustainable housing is more than solar panels and water tanks.
By understanding and working with nature we can reduce energy costs and help the environment.
Perched on the hillside, a slate-coloured building blends into the landscape. There are no signs of a concrete drive, garage or fencing: those Aussie architectural mainstays. Instead, a mulched path meanders through conifer trees.
This isn’t your average property. Designed by architects Ken Yeh and Carol Marra (the multi-awarded Marra + Yeh), it has a lot to teach us about how to design alongside nature, for the planet and ourselves. It’s a journey so many of us are interested in.
Building with the environment in mind
The duo studied architecture at the University of Texas (where they met).
Ken:
Ken grew up around the tropical jungles of Malaysia and is both tutor and guest critic at the University of Sydney and UNSW. “I have a benchmark in my head of how things should be in a mature and stable eco-system. It’s a feeling. You go into a pristine place; all your senses can tell you. You can hear it; you can feel it.” His goal in designing is to try to discover what a place was originally like, then how to enhance it.
Carol:
Carol, who is originally from Argentina, also has a deep understanding of place. She also tutors and is a guest critic at the University of Sydney and UNSW. Carol says sustainable, ecological design (which the pair specialise in) starts with considering everything outside your piece of land and thinking holistically. “Across the street from us is a creek. We understand what happens here affects the waterway and the animals that drink it. So, it’s big picture thinking,” she says.
It’s also about making buildings that can survive the changing climate conditions, plus respond to the energy crisis.
Two windows promote cross ventilation and natural sunlight while storage is a must. (Photo: Brett Boardman)
The house that Ken and Carol built
Elevated above a hanging swamp, the home’s design allows water to seep unimpeded down into the creek.
Caring for the land flows both ways. By not blocking the water’s path they avoid flooding and dampness, Carol says. Another perk: the relaxing sound of running water.
Inside, things are equally interesting. In the ‘mud-room’, as they call their entry, there’s a bench, washing machine, clothing rack and fridge. Here, dirty and wet clothing are discarded and shoes exchanged for slippers. It turns out the freezer is located here to reduce energy use: it’s the coldest zone of the house.
Sustainable architects Ken Yeh and Carol Marra at home. (Photo: Linda Moon)
Beyond solar panels and tanks
“Sustainable design is not just about adding on; it’s not just about buying solar panels,” Carol emphasises.
Our starting point should be to make use of everything nature gives us for free, Ken says. This includes sunshine (warmth), breezes (which cool), soil (for creating gardens) and water.
Every part of the building is planned consciously. Bedrooms are located on the south (least sunny side) of the building. “Sleeping in a cold room is better for you,” Carol says. And, being further from the road, it’s also quieter.
The bathroom is designed for multiple use with separate compartments for hand-basin, toilet and showering. The latter includes an adjustable-size wooden Japanese bathtub (designed by the pair) and an expansive window that looks out onto 3D art courtesy of nature: trees, occasional wallabies and birds.
Bathing with the window open allows airflow to remove humidity and condensation.
“You need to identify the gifts [of nature] and accept them humbly.” – Ken Yeh.
Large north-facing, double-glazed windows harness the sun’s heat and light. (Photo: Brett Boardman)
Passive design
Designing with your local climate in mind is known as ‘passive design’. Some understanding around science, like wind direction and the sun’s angle, helps here, Carol adds.
To capture free heat from the sun, the main living zones are situated in the north. Large, double-glazed, north facing windows allow sunlight to penetrate deep into the rooms. On sunny days these don’t require artificial heating, which equals lower energy costs and CO2 emissions.
When it’s hot they open the windows to the breeze or use blinds to block the sun. “It’s a way of calibrating your building to what’s happening outside,” Ken says.
The rooms are also designed to be compartmentalised to keep the heat in. “In winter you create smaller spaces; in summer bigger spaces,” Carol says. “You live in nature.”
The living area opens up to an outdoor space with a kitchen and insect-proof screens that allow them to take advantage of any cooling breezes on hot summer nights.
In the mountains most winds come from the west. Thus, the house has few windows facing west.
“Look at nature first. The water flows under, the wind flows over.” – Ken Yeh.
Space for a wok BBQ. The indoors and outdoors blend seamlessly thanks to clever use of glass and almost invisible insect screens. (Photo: Brett Boardman)
Designing for flexibility and change
Other important features of the home include built-in storage cupboards and enormous doors between several rooms. This allows for flexibility. Rooms can be opened up to become bigger or used for a different purpose.
It’s about designing alongside time, Ken says. How we work and study, for instance, has changed; the composition of families changes, Carol says. The ability to enable change without too much pain adds value to a building.
Large doors allow spaces to be merged, enlarged and compartmentalised. (Photo: Brett Boardman)
Challenges for mountains homes
Unfortunately, few buildings in the Blue Mountains (or beyond) are designed sustainably.
“It’s a very extreme climate and we don’t make people design for this in our policies,” Carol says. The result is that many of us suffer in cold homes inappropriate for the climate with the knock-on of high heating bills. It’s a housing legacy we continue to pass onto the next generation, Carol says.
Other big challenges facing our housing (and thus our wellbeing) are affordability and lack of suitability. “The marketplace tends to cater for two types of homes: low-density, single-family dwellings and high-density apartments,” Carol says.
Housing, like nature, needs to be biodiverse. This means having housing styles that cater to extended families, older people and others.
Retrofitting your home
Integrating where we live with nature is something we can all do, Carol says. “We have a lot of opportunities to change things and do things better.”
As a starting point, they recommend focusing on the skin of your building with insulation, sealing and draught proofing. Improve the performance of any poor-quality windows. If you can, create an enlarged, double-glazed window in the north of your home.
This way you won’t need as many solar panels. “It’s like putting a jacket on before you blast the heater,” Carol says.
“You can do something at any scale that’s positive and impactful” – Carol Marra.
Harmonious exterior of the home office. Minimal impact upon and maximum gain from the environment. (Photo: Brett Boardman)
This story has been produced as part of a Bioregional Collaboration for Planetary Health and is supported by the Disaster Risk Reduction Fund (DRRF). The DRRF is jointly funded by the Australian and New South Wales governments.
Thank you to everyone that joined us at the Planetary Health Centre on Saturday for the first of our Skill Share Saturdays program!
The Centre was a hive of activity all day, and we heard from @alchemyfarms_permaculture, the @ediblegardentrailbluemountains team and Andy Mann. Also thanks to Sherlie McMillan from Greater Blue Mountains Rotary for teaching the Fashion Upcycling workshop, and Virginia Field for the Tai Chi and Qigong class.
The next event will be held on Saturday 1st August - you can register your place here: https://events.humanitix.com/skill-share-saturdays-at-the-planetary-health-centre
🖐Get involved!
Do you have a skill, program or interest that promotes planetary health that you`d be willing to share with members of the local community? We are looking for more workshop and session hosts for our future events.
Join us at the Planetary Health Centre in Katoomba on the first Saturday of every month for Skill Share Saturdays!
Our July program includes: - What to grow in a Blue Mountains climate - Eating for Earth - Tai Chi and Qigong - Fashion upcycling and clothing reuse workshop - How to get involved with the Edible Garden Trail
You are also welcome to bring any surplus seeds or produce for our Crop Swap, or wind down in the Planetary Health Cafe (until 2pm).
If you have a skill that you want to share, or any questions or queries, please contact [email protected]
Visit the website to view the full program of events and register your place.
Join Andy Mann, a 23 year old Lawson local, for their Eating for Earth session 🌏
Eating for Earth is a judgement-free plant-based educational workshop that all types of eaters are encouraged to attend. There will be a presentation about the environmental impact of diets, a discussion section, and best of all, food! The food will be fully plant-based.
Andy wants to help inform our passionate community about how we can better reduce dietary environmental impact.
The session will run from 11AM - 12PM on Saturday 4th July.
Other sessions include: - What to grow in a Blue Mountains Climate - Fashion Upcycling - Tai Chi and Qigong - Bushcare on the Planetary Health site - How to get involved with the Edible Garden Trail
To register your place, visit our website: https://events.humanitix.com/skill-share-saturdays-at-the-planetary-health-centre...
We’re excited to announce the second Blue Mountains Food Security Fair, taking place in Katoomba in October 2026.
This annual event will bring together growers, thinkers, makers, and community members to explore one of the most important challenges of our time: how we grow, share, and sustain food in a changing world.
Across the weekend, we’ll be exploring themes including: - Healthy soil and regenerative systems - Food and human health - Plant-based food futures - Home and community food resilience - Water-sensitive and climate-adapted growing - Indigenous food knowledge and systems - School food systems - Australia’s food procurement - Global food security challenges Expect a dynamic program of inspiring speakers, practical workshops, and hands-on experiences designed to leave you informed, empowered, and connected.
Key information Date: Weekend of 10th October 2026 Location: Blue Mountains Planetary Health Centre, Katoomba, NSW We’ll be announcing speakers and program details soon.
We are also inviting expressions of interest from individuals and organisations who would like to contribute to the program, host workshops, run a stall or partner with us.
Do you struggle making the most of your veggie garden all year round?
Join Leni from @alchemyfarms_permaculture on Saturday 4th July for her Permaculture Workshop: Learn how to grow WITH the Upper Blue Mountains seasons, rather than battling against them.
During the two-hour session, you`ll cover crop selection for different seasons, what to grow from seeds vs seedlings, frost and wind protection, and nurturing your soil with a seasonal cycle.
Register for this and other sessions as part of our Skill Share Saturdays program via this link: https://events.humanitix.com/skill-share-saturdays-at-the-planetary-health-centre...
From Saturday 4 July, we are opening up the Planetary Health Centre for our monthly Skill Share Saturdays program: https://events.humanitix.com/skill-share-saturdays-at-the-planetary-health-centre
Throughout each day, you can expect to find a variety of sessions focused on restoring the health of the planet, in terms of the environment, community and economy.
Sessions at the first event include:
- What to grow in a Blue Mountains climate - Plant-based eating - Tai Chi and Qigong - Fashion Upcycling and clothing reuse workshop
You are also welcome to bring any surplus seeds or produce for our Crop Swap, or wind down in the Planetary Health Cafe (until 2pm).
Visit the website to view the full program of events and register your place: https://events.humanitix.com/skill-share-saturdays-at-the-planetary-health-centre
Registrations essential.
We are also inviting expressions of interest from individuals and organisations who would like to contribute to the program - please reach out to [email protected] if you are interested!...
🍃Volunteer weekly at the Planetary Health Centre 🍃
From next week, Tuesday 28th April, come and join Leni from @alchemyfarms_permaculture from 10am - 12pm, to help with the management of the Planetary Health veggie gardens, where any surplus produce can be shared!
The gardening session will be followed by a complimentary tea or coffee in the Planetary Health cafe.
📆Day: Every Tuesday 🕙Time: 10AM - 12PM
📍Where: Blue Mountains Planetary Health Centre 33-39 Acacia Street Katoomba (follow the pathways at each side of the building, round to the terrace and gardens).
What shall I bring? All you need to bring is water, gardening gloves and a hat.
Last week we had the pleasure of hosting the first year Medical students from @notredamesyd for their Rural and Indigenous Immersion trip across Katoomba and Lithgow. Across two days, 150 students learnt about the link between human health and a healthy environment, the work of the @bluemountainsplanetaryhealth Initiative and the @bluemountainscitycouncil to create climate resilient communities, and got to explore our site using heat mapping tools....
Join Rotarians for Planetary Health on International Women`s Day, from 2.30-4pm Sun 8 March, for the opening of a portrait display to celebrate local women who have made a meaningful impact on protecting animals and nature. The photographs by Sue Lightfoot and others are part of a long-term initiative to build a living, community-driven database of women working to protect animals and the natural world.
The display will be open until 1 April, Thursday to Saturday, 9.30am–3.30pm at the Junction 142 Village markets (church space). As the project develops, community members will be invited to nominate women whose work deserves recognition.
The launch follows the Uniting Church and Plant Inspired`s monthly community luncheon from 12-2pm, which this month features the Older Women`s Network Blue Mountains. For more information contact 0434 691 496 (Teya)
In a world being threatened by war, greed, cruelty and selfishness, the Planetary Health Wellness Weekend will close with a gathering of people who have faith that kindness, generosity, love, creativity and community, and the healing of our land, are a better way forward. We`re thrilled that harpist Dawn Egan will be performing at this inspiring event in the Planetary Health exhibition space. Afternoon tea will be provided. Register to attend here (link in profile under Wellness Weekend): https://bit.ly/4kUkzfm
Had lunch yet? Head over to the Planetary Health Centre for these delicious offerings from @8thingskatoomba today (Sat 28 Feb): South Indian dosa, Korean bao, NY Cheese burger, Bali nasi, Mullum tofu fries, shoestring fires & red bean mochi!
Don`t miss hearing Andrew Skeoch at 2pm today at the Planetary Health Centre! He`s an acoustic ecologist and author of `Deep Listening to Nature` and uses technology to help identify the different `conversations` happening in the world around us. His presentations are a revelation! Reserve your spot here (link in profile under Planetary Health Wellness Weekend): https://bit.ly/4kUkzfm
Linda Moon has lived in the upper Blue Mountains since childhood and is a freelance writer for Australian media. A qualified naturopath, permaculture designer, mother and former student of social work, her passion is building local community, gardening, mental, emotional, social, housing and environmental health – all of which are linked!
In Katoomba, a grassroots litter-picking group tackles rubbish before it reaches our water supply. Their story shows how local environmental action, fueled by community connection, can drive meaningful change for planetary health.
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