The Spacewise Home: Passive House Meets Thoughtful Living

Lenah Valley,
TAS
This home will be open for in-person tours on the 17th May 2026

About this home

Welcome to a home that shows how good design and sustainability can work together in everyday living.


This compact 146m² home stays comfortable year-round through smart design and passive house principles. Internal airtightness paired with a heat recovery ventilation system, triple glazing, and generous insulation within 140mm timber stud frames means minimal or no heating costs while cross ventilation provides cool air in summer. North and west orientation captures winter sun, while extended northern eaves provide natural summer shading.

All external walls are braced with OSB for added structural resilience in high winds.

We've used natural materials as much as possible. Compressed wood fibre cladding wraps the exterior, while inside you'll find raw engineered floors finished with natural wax, natural fabrics, and walls painted in a breathable lime-based paint.

Every area has a purpose, there is no waste of space. The attic houses the ventilation unit, raked ceilings open up the living and bedroom spaces, and wall-to-wall cabinetry plus under-house storage keep things organised. Most furniture is second-hand or custom-made from off-cuts where possible.

A semi-separate section of the home offers privacy and flexibility— for aging parents, returning adult children, or international students. Two bedrooms serve multiple functions: office, guest room, exercise space, or creative studio, adapting as needs change.

Front and rear balconies extend the living space. The front porch encourages community connection, while the private rear areas capture northern and western sun for relaxed outdoor living.
The garden is a work in progress applying permaculture principles—an evolving edible landscape combined with local natives. Deliberate openings in fencing create wildlife corridors, welcoming nature through the property.

This is spacewise design in practice: a home that's comfortable, functional, sustainable, and shows that living well doesn't require a very large footprint.

Q & A

What motivated you to build or retrofit sustainably?
I'd actually flip that question around — why wouldn't you want to build sustainably? For every decision about materials and techniques, we asked ourselves: is it permitted, is it truly sustainable, are there trades who can work with it, and can we realistically afford the time and cost? Then we made the most sustainable decision possible.
The combination of a higher amount of insulation, triple glazing and air tightness makes the home comfortable all year around with minimal heating.
We have had many of those moments and will share these during the tour.
To make full use of our outdoor space through permaculture. We've made a start, but it's a (long) journey with limited time.
Back to 2026 Homes
Type: Passive House or EnerPHit, Standalone house/townhouse
Project: New build
Designer: Spacewise Design
Builder: Owner Builder
Size: 146m²
Energy Rating: Passive House (uncertified)
Bedrooms: 3
Bathrooms: 2

Sustainability Features

Building Materials & Envelope

Draught-proofing/air sealing
High-performance insulation
Double or triple-glazed windows
Sustainable or low-impact materials
Other

Heating, Cooling and Ventilation

Passive heating/cooling (north-facing glazing, cross ventilation, thermal mass, shading, etc.)
Ceiling fans
Mechanical ventilation with heat recovery (MVHR) system

Energy and Appliances

Rooftop solar PV
Efficient lighting (LED, daylighting, solar skylights)
Heat pump hot water
Electric cooktop - induction/ceramic

Water & Waste Systems

Water-efficient fixtures

Landscape & Biodiversity

Native garden
Permaculture garden
Edible garden
Wildlife-supporting habitat

Climate Resilience

Flood
Cyclone/storm

Accessible & Flexible Design Features

Design for flexible use
Design for multigenerational living or dual occupancy
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