Treehouse extension
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House Notes – Treehouse extension
With creative clients who had a desire to make their home better connected to the garden and climate, the “Treehouse” extension is a standalone addition at the southeast corner of the existing home to make the most of the northern aspect to the back garden and minimise blocking of views and daylight from the house. Each space was sized carefully to build the least necessary (a key sustainability approach) with the least impact on the existing post-war house. Orientation, shading and openings optimise passive heating and cooling and materials were chosen for robustness and sustainability. The separate wing enables several generations to enjoy gathering at the home with quiet space for the owners to retreat to.
Plumber: SANA Plumbing
Sustainability Features
- Energy efficiency:
- Efficient lighting
- Passive heating cooling:
- Cross ventilation
External planting
Passive solar designed home
Shading
Thermal chimney
Thermal mass
- Passive heating cooling:
- Subtropical planting to cool incoming breezes, no openings to west.
- Active heating cooling:
- Ceiling fans
- Water heating:
- Solar hot water (flat panel)
- Energy Efficient Lighting
- Natural daylight
- Window Protection:
- Awnings (external)
Blinds
Deciduous tree/vegetation
Eaves
External window hoods/surrounds
- Recycled and reused materials:
- Timber screen (hardwood battens and decorative old windows) from demolished corner of deck reused in carport
- Sustainable materials:
- Burnished concrete slab at ground level for thermal mass. Plantation pine framing. Galvanised custom orb cladding to upper level to minimise maintenance (vertical grooves help self clean and no painting required). Minimal painted elements to upper level. Upper timber flooring (B Grade Blackbutt solid flooring) fixed directly to floor joists to minimise materials of typical method (particle board then floating floor).
- Recycled and reused materials:
- Stairs
- Insulation Type:
- Under-roof
Ceiling
Internal walls
External walls
- Ceiling Type:
- Bulk – polyester
- Ceiling Rating:
- R4.5 cavity roof space R3.9 raking ceilings
- Under Roof Insulation Type:
- Varies. Main roof Anticon 60 plus Thermoseal (729) foil
- Internal Walls Insulation Type:
- Bulk – polyester
- Internal Walls Insulation Rating:
- R2.6
- External Walls Rating:
- R2.6
- External Walls Type:
- Bulk – polyester
- All-Electric Home?
- Yes
- Renewable energy used:
- Solar PV grid connect
- Size of PV system:
- 5.58kW
- Renewable energy
- Charging point allowed for for future electric car
- Total cost of home when constructed:
- 2020
- House Size
- 169m2 internal including 76m2 new
- BAL Rating
- No BAL rating requirements at time of construction
- Roof
- Metal (Colorbond)
- Wall Materials
- Lightweight construction (timber frame)
Metal (Galvanised)
- Wall Materials
- Fibre cement externally to lower level, Ampelite Lexan Thermoclear to stair landing
- Window and Door Types
- Louvre windows
Sliding windows/doors
- Number of bedrooms
- 3
- Number of bathrooms
- 2
- Garden / Outdoors
- Composting
Edible garden
Local indigenous plants
Water wise plants
- Other Waste Reduction Practices:
- Garden sculptures from salvaged metal
- Healthy home features
- Carpet free - tiles/concrete/timber flooring throughout
Cross flow ventilation
Natural light and ventilation
- Healthy Home
- No airconditioning
- Housing Type:
- Standalone House
- Project Type:
- Retrofit/addition
- Builder
- Williamson Builders
- Designer
- Emma Scragg Architect
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