Originally posted by Seano180
Although the HX is ground breaking and blah blah blah, i dont see it as viable as what i once did.. for the following reasons.
Days per year = 365
Raining weather in Melbourne = 156 days
Total days = 365 - 156 = 209 days.
Now, we know that there are 104 days (weekends) per year. This means that 30% of the year are non trade days.
If we apply that 30% to the total of 209 days this gives us a total of 146.3 CONSTRUCTION DAYS.
So, if the HX is building 1 x 3 Bedroom home in 10 years (per day) this equates to:
1 home x 146.3 Construction days = 146 homes per year.
My current thinking is:
It takes 3-4 Brickies to build a house nowadays and can brick a house in 5 days. Estimate them to all be on $40 per hour
4 brickies x $40 per hour x 10 hour days x 5 days = $8000 per week.
The HX still requires an operator. Estimate them to be on $40 per hour also.
Per day/house built = 40 x 10 = $400 ($2000 per week)
That as a percentage means that the HX reduces construction costs by 95%.
Lastly, each HX is estimated at 2 million so to pay this back, we will need to build:
$8000 - $2000 = $6000
2,000,000/6,000 = 333 weeks (6.4 years) not including maintenance downtime or costs.
Maybe i am looking at this wrong, but its not as great as i once thought.
Leaving the rest of your assumptions is as, you would need to do $8000-$400 = $7,600, and per day not per week, because after 1 day the machine moves onto another site and saves the build costs there there (not after 1 week).
No consideration of all the other savings like saved interest on property and earlier returns for the owners which would pass through the value chain, reduced waste costs, reduced insurances, reduced labour oncosts, etc. (offset partly by maintenance and operating costs, as you point out)
