To calculate the estimated cost of building our sustainable small home, I first had to figure out all the elements required in its construction. A ‘Work Breakdown Structure’ is the term we applied to this process when I was designing structures for airplanes – I’m not sure if it’s the term architects use. Searching for information that would allow me to do a ‘Work Breakdown Structure’ I found the QV cost builder website and a document named “Elemental Analysis of Costs of Building Projects”. I also spent a lot of time googling examples to create the following list of cost elements for our home. Hopefully this covers everything.
Overhead
- Consulting
- Engineering reports/structural design site/foundation
- Geotechnical report
- Surveyor
- Drainage, hydraulic engineering report
- Quantity surveyor
- Architect
- Resource consent application
- Landscape design
- Resource consent
- Building consent
- Builders construction and liability Insurance
- Performance and blower test (possibly)
- LIM report and certificate of title
Siteworks
- Excavation and foundation
- Excavation
- Retaining walls
- Piles foundation
- Groundworks
- Landscaping and Lawns
- Driveway
- Parking
- Paths
- Stairs
- Decks
- Railings
- Plants
- Trees
- Septic system
- Water tanks
House
- Structure/framing
- Sub Floor
- Wall structure external and internal
- Roof
- Insulation
- Rainwater system
- Exterior cladding
- Interior lining
- Flooring
- Doors exterior
- Doors interior
- Plastering
- Painting
- Door hardware and keys
- Increased wall to floor ratios
- Windows
- Electrical
- Double power points throughout
- Data connections
- Safety plugs several locations
- Lights, incl exterior
- Mains power
- Solar panels inst.
- EV car connection
- Domotica
- Plumbing
- Main connection water tank
- Kitchen
- 1 x Toilet
- 1 x Shower
- 1 x Vanity
- (1 x Bath)
- 1x outside shower
- Water heater
- 1 x 300 litre HWC?
- Wood burner
- Solar panels
- Solar water heater/hot water cylinder
- Kitchen
- Tabletop
- Cupboards, cabinets
- Tiles
- Sink
- Tapware
- Kitchen appliances
- Dishwasher
- Microwave
- Oven
- Refrigerator
- Cooktop
- Laundry
- Washingmachine/dryer
- Bathroom
- Shower
- Bath
- Vanities
- Tiles wall and floor
- Mirrors
- Tapware bath, shower, basins
- Toilet
- Toilet
- Tiles wall floor
Add to total building cost
- Builders profit
- Tax
- Unforeseen
Margriet Geesink