The Wombat III 2021

This profile is written and maintained by the homeowner, architect, or builder.

House Notes – The Wombat III

The Wombat III is our retirement home we built after returning from sailing Wombat I in Europe, and our Motorhome Wombat II in the USA. After learning to live off grid on the boat and motorhome, we decided to build our house off-grid.

Living on our boat, Heidi and I decided that we could live without bills and help the environment at the same time! In our off grid home, we have a 100,000L water tank, septic treatment plant, 9kW solar, 15kW batteries, heat pump hot water, thermally separated double-glazed windows and insulation to the highest ratings.

Wombat III is our answer to comfortably living off grid. We are not zealots about sustainability, just sensible. Anyone with the desire can live a normal life in an off grid house, with little or no concessions. Power, water, sewage prices won’t go down! We all need to consider our impact upon the environment. We will be happy to talk to you about our journey.

This house achieved a NatHERS rating of 7.4 stars using NatHERS accredited software. Find out how the star ratings work on the Nationwide House Energy Rating Scheme (NatHERS) website.

SUSTAINABILITY FEATURES

Years Open
2018
2020
2021
ENERGY AND WATER EFFICIENT FEATURES
    • Energy efficiency:
    • Draught proofing
      Efficient lighting
      Efficient appliances
      Energy monitoring
      Smart home features
    • Passive heating cooling:
    • Cross ventilation
    • Active heating cooling:
    • Ceiling fans
      Heat pump
      Split system airconditioner
    • Water heating:
    • Hot water heat pump
    • Water harvesting and saving features:
    • Rainwater storage - Above ground
      Stormwater management
      Low flow shower heads
    • Average water consumption per day:
    • 100Lt.
    • Above ground rainwater storage Type:
    • Steel
    • Above ground rainwater storage Size
    • 100,000 Lt.
    • Energy Efficient Lighting
    • LED lights throughout
      Natural daylight
    • Window Protection:
    • Awnings (external)
      Drapes/curtains
      Eaves
INSULATION SPECIFICATIONS
    • Insulation Type:
    • Under-roof
      Ceiling
      Internal walls
      External walls
      Floor
    • Ceiling Type:
    • Bulk – glass wool
    • Ceiling Rating:
    • R6.0
    • Floor Type:
    • Bulk – glass wool
    • Floor Rating:
    • R2.0
    • Under Roof Insulation Type:
    • Reflective foil
    • Under Roof Insulation Rating:
    • R2.0
    • Internal Walls Insulation Type:
    • Bulk – glass wool
    • Internal Walls Insulation Rating:
    • R2.0
    • External Walls Rating:
    • R2.5
    • External Walls Type:
    • Bulk – glass wool
RENEWABLE ENERGY SPECIFICATIONS
    • All-Electric Home?
    • No
    • Energy star rating:
    • 7.4
    • Renewable energy used:
    • Energy storage/battery
      Solar PV off-grid
    • Size of PV system:
    • 9kW Solar 15kW Batteries
    • Average Daily Energy Consumption:
    • 11kWh
COSTS AND COST SAVINGS
    • Total cost of home when constructed:
    • $350,000
    • Cost estimate of sustainable home/features:
    • $30,000
    • Estimate of annual savings:
    • $3000
HOUSE DESIGN SPECIFICATIONS
    • House Size
    • 150m2
    • BAL Rating
    • BAL – 29: Increasing levels of ember attack and ignition of debris with a heat flux of up to 29kW/m2
    • Roof
    • Metal (Colorbond)
    • Wall Materials
    • Metal (Colorbond)
      Stone

    • Wall Materials
    • BAL 29 Render
    • Window and Door Types
    • Awning
      Double glazing
      Sliding windows/doors
    • Universal Design Features
    • 80cm minimum door opening width
      100cm minimum door opening width
      Flush thresholds (no lip) to all external doors
      Hobless showers
      No Corner cupboards
      Pocket doors so that cabinet doors are out of the way
      Shower head on rail for various heights
    • Number of bedrooms
    • 3
    • Number of bathrooms
    • 2
HEALTHY HOME FEATURES
    • Healthy home features
    • Airtight house design
      Carpet free - tiles/concrete/timber flooring throughout
      Chemical free cleaning products used
      Cross flow ventilation
      Indoor plants for air filtration
      Natural light and ventilation
Location
Healesville VIC 3777
    • Housing Type:
    • Standalone House
    • Project Type:
    • New Build
    • Open with support of
    • Healesville CORE
    • Builder
    • Owner

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