Extreme Enterprise House Cost Detail: Difference between revisions
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#Cost - the site says $17-30/sf for shell including roof. For comparison, shell panels (windows not included) in our system are $120 each for a 4'x8' panel -so if we have the most basic square 32x32 feet - cost is $120*32= $3840. But that is finished panels - minus interior exterior finish it is about exactly half of that, $1900. The roof in our case costs $6272 by taking our roof panels into consideration minus the roofing finish. So we are at $8k or $8/sf for comparable shell - as opposed to $17-30 for SIPs. | #Cost - the site says $17-30/sf for shell including roof. For comparison, shell panels (windows not included) in our system are $120 each for a 4'x8' panel -so if we have the most basic square 32x32 feet - cost is $120*32= $3840. But that is finished panels - minus interior exterior finish it is about exactly half of that, $1900. The roof in our case costs $6272 by taking our roof panels into consideration minus the roofing finish. So we are at $8k or $8/sf for comparable shell - as opposed to $17-30 for SIPs. | ||
#Labor - small panels are doable by manpower, but not large ones. Our panels weigh between 137 and 211 lb, and 66 lb for roof members.Labor for SIPs is not doable without crane or lift. Our requirement is that 2 people can do the labor themselves without renting any machines. | #Labor - small panels are doable by manpower, but not large ones. Our panels weigh between 137 and 211 lb, and 66 lb for roof members.Labor for SIPs is not doable without crane or lift. Our requirement is that 2 people can do the labor themselves without renting any machines. | ||
#Customization - distributed supply chain management is harder. Our promise is common, off-the-shelf materials anywhere. I'm imagining that if we have a number of house models - ordering the same thing from many suppliers will be expensive: each supplier would be makingcustom cuts for only a few houses. I am assuming that this is the reason why no DIY builders use SIPS. Do you know of a single DIY builder, | #Customization - distributed supply chain management is harder. Our promise is common, off-the-shelf materials anywhere. I'm imagining that if we have a number of house models - ordering the same thing from many suppliers will be expensive: each supplier would be makingcustom cuts for only a few houses. I am assuming that this is the reason why no DIY builders use SIPS. Do you know of a single DIY builder, with a custom house, that uses SIPs? | ||
with a custom house, that uses SIPs? | |||
=Links= | =Links= | ||
Revision as of 16:43, 31 August 2020
12x16 Foot Addition Budget
- Google doc - [1]
Appliances and Utilities
Roof by Catarina
Spreadsheet - $2183 - [2]
Working Doc - Foundation
Working Doc - Floor, Walls, Roof
Working Doc - Utilities
- Utility Panel - indoor section
- Utility Panel - outdoor section
- PV
Comparison to SIPs
An astute reader will ask - why aren't we using SIPs?
Well, I think it's cost, labor, and customization aspects. Our cost is 1/2-1/4 that of SIPs for a start. Here;s the detail as a good study:
- Cost - the site says $17-30/sf for shell including roof. For comparison, shell panels (windows not included) in our system are $120 each for a 4'x8' panel -so if we have the most basic square 32x32 feet - cost is $120*32= $3840. But that is finished panels - minus interior exterior finish it is about exactly half of that, $1900. The roof in our case costs $6272 by taking our roof panels into consideration minus the roofing finish. So we are at $8k or $8/sf for comparable shell - as opposed to $17-30 for SIPs.
- Labor - small panels are doable by manpower, but not large ones. Our panels weigh between 137 and 211 lb, and 66 lb for roof members.Labor for SIPs is not doable without crane or lift. Our requirement is that 2 people can do the labor themselves without renting any machines.
- Customization - distributed supply chain management is harder. Our promise is common, off-the-shelf materials anywhere. I'm imagining that if we have a number of house models - ordering the same thing from many suppliers will be expensive: each supplier would be makingcustom cuts for only a few houses. I am assuming that this is the reason why no DIY builders use SIPS. Do you know of a single DIY builder, with a custom house, that uses SIPs?