Passiv Laneway – certified passive house 2020

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Location
Freshwater NSW 2096
    • Housing Type:
    • Granny Flat
    • Project Type:
    • New Build
    • Builder
    • Dave Selby - IMAC Constructions
    • Designer
    • Envirotecture

About Passiv Laneway – certified passive house

This compact granny flat sits atop an elegant garage on a discreet laneway on the Northern Beaches of Sydney. A tightly manipulated building envelope ensured Council compliance on a tight site.

This home, and its simple presentation to the street disguise the elegance and comfort that is so often missing in these pieces of gentle densification.

The floating home calls for a simple aesthetic, blank side walls are clad in dark standing seam to match the roof while the more visible long elevations are a blackbutt cladding treated to age over time.

The garage below is made from a split face concrete block, both beautiful and practical at the same time. The contrast between the simplicity and heaviness of the base and the floating top works well. This building will definitely settle well into its new home over the first few years.

The industrial checkerplate staircase provides for a dramatic entry with sky views before arriving on the shielded entry deck.

The home is the third certified passivhaus in Sydney and Envirotecture’s second.

The timber/aluminium windows and door with their double glazing are part of a well insulated airtight building envelope. The heat recovery ventilation system ensures fresh air 24/7 although the doors can often be found open a gorgeous autumn day.

Extensive use of timber is both a more sustainable option and comforting in the compact space. The treetop views afforded by the elevated position give this granny flat a sense of space that belies its true size.

Some other features include:

–          Kitchen cupboard doors are recycled PET and recycled timber
–          Bathroom & kitchen tiles were salvaged
–          Hardwood offcuts were used for handrail, fence and garden edging
–          The water tanks feed the washing machine, toilet and garden
–          Clad in timber from a sustainably managed forest
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SUSTAINABLE FEATURES

Years Open
2020
ENERGY AND WATER EFFICIENT FEATURES
    • Energy efficiency:
    • Draught proofing
      Efficient lighting
      Efficient appliances
    • Passive heating cooling:
    • Cross ventilation
      Heat recovery ventilation system
      Passive solar designed home
      Shading
    • Active heating cooling:
    • Ceiling fans
      Heat exchange ventilation system
      Heat pump
      Split system airconditioner
    • Water heating:
    • Hot water heat pump
    • Water harvesting and saving features:
    • Rainwater storage - Above ground
      Low flow shower heads
      Low flow taps
    • Above ground rainwater storage Type:
    • Tanks
    • Above ground rainwater storage Size
    • 2,500L for re-use
    • Energy Efficient Lighting
    • LED lights throughout
      Natural daylight
    • Window Protection:
    • Deciduous tree/vegetation
      Eaves
SUSTAINABLE & RECYCLED MATERIALS
    • Recycled and reused materials:
    • Benchtops
INSULATION SPECIFICATIONS
    • Insulation Type:
    • Ceiling
      Internal walls
      External walls
      Floor
    • Ceiling Type:
    • polyester and PIR
    • Ceiling Rating:
    • R5.5
    • Floor Type:
    • Bulk - polyester
    • Floor Rating:
    • R3.0
    • Internal Walls Insulation Type:
    • Bulk – polyester
    • Internal Walls Insulation Rating:
    • R2.0
    • External Walls Rating:
    • R2.5
    • External Walls Type:
    • PIR foam
RENEWABLE ENERGY SPECIFICATIONS
    • All-Electric Home?
    • Yes
    • Renewable energy used:
    • Solar PV grid connect
    • Size of PV system:
    • 6kW
COSTS AND COST SAVINGS
    • Total cost of home when constructed:
    • $485,061 includes triple garage, decks, site works and external stairs
    • Cost estimate of sustainable home/features:
    • $20,000
    • Estimate of annual savings:
    • $2,000
HOUSE DESIGN SPECIFICATIONS
    • House Size
    • 60m2
    • BAL Rating
    • No BAL rating requirements at time of construction
    • Roof
    • Metal (Colorbond)
    • Wall Materials
    • Timber
    • Window and Door Types
    • Double glazing
      Tilt and turn
    • Universal Design Features
    • 80cm minimum door opening width
      Flush thresholds (no lip) to all external doors
      Hobless showers
    • Number of bedrooms
    • 2
    • Number of bathrooms
    • 1
GARDEN AND WASTE REDUCTION
    • Garden / Outdoors
    • Bee hotels/friendly
      Composting
      Edible garden
      Local indigenous plants
      Organic
      Permaculture
      Native plants
    • Waste Reduction Practices:
    • Compost all food scraps
      Recycle
      Repair
      Swap with friends and neighbours
HEALTHY HOME FEATURES
    • Healthy home features
    • Airtight house design
      Automated ventilation system
      Carpet free - tiles/concrete/timber flooring throughout
      Cross flow ventilation
      Heat recovery ventilation (HRV)
      Low VOC paints/sealer/varnish
      Natural light and ventilation
      VOC free paints/sealer/varnish

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