Build Time: Difference between revisions

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#redirect [[Seed_Eco-Home_4_Calculations#Spreadsheet]]
= Build Time to 1.0 Labor-Hour per Square Foot =
 
This page defines how Open Source Ecology (OSE) can credibly achieve approximately 1.0 all-in labor-hour per finished square foot (LH/ft²) for housing construction. This is not a productivity claim but a systems-design outcome based on structural elimination of labor categories.
 
== Canonical Metric Definition ==
 
OSE uses a single, non-negotiable metric:
 
All-in Labor Hours per Finished Square Foot (LH/ft²)
 
This includes every human labor hour required to deliver a finished, inspected, code-compliant house, excluding land acquisition.
 
Included:
* On-site and off-site fabrication
* Logistics and material handling
* Staging and setup
* Coordination and supervision
* Inspections and rework
* Training inefficiency
* Tooling setup
* Punch lists and callbacks
 
Any metric that excludes these categories is not acceptable for system planning.
 
== Industry Baseline ==
 
Conventional housing typically exhibits the following labor distribution:
 
{| class="wikitable"
! Category !! Typical LH/ft²
|-
| Direct build labor || ~0.85
|-
| Trade handoffs and waiting || 0.40–0.60
|-
| Inspection friction || 0.20–0.30
|-
| Rework and errors || 0.30–0.50
|-
| Coordination and supervision || 0.30–0.50
|-
| Logistics and staging || 0.20–0.30
|-
| Training and variability || 0.20–0.30
|-
| Total || ~2.5–3.0
|}
 
OSE’s objective is to remove approximately 1.5–2.0 LH/ft² by eliminating entire labor categories rather than compressing them.
 
== Principle: Labor Is Eliminated, Not Optimized ==
 
OSE does not pursue 1.0 LH/ft² through:
* Increased effort
* Better management
* Higher skill
* Motivation
* Lean terminology
 
OSE achieves 1.0 LH/ft² by making entire classes of labor structurally impossible.
 
== Elimination Strategy ==
 
=== Eliminate Trade Boundaries ===
 
Target reduction: 0.4–0.6 LH/ft²
 
Rule:
No build step may require waiting for another trade.
 
Mechanism:
* Multi-trade modules (structure, wiring, boxes, air sealing combined)
* No rough-in versus finish phases
* No return visits
 
OSE action:
Walls, floors, roofs, wet cores, and power centers are treated as atomic modules that are completed once, fully.
 
If a worker must return later, the design has failed.
 
=== Eliminate Inspection Labor ===
 
Target reduction: 0.2–0.3 LH/ft²
 
Inspections compensate for low process trust.
 
Mechanism:
* Fixed module designs
* Fixed fastener schedules
* Fixed routing paths
* Process verification instead of outcome investigation
 
OSE action:
Modules are pre-approved. Inspectors verify that the approved process was followed, supported by time-lapse and AI-assisted quality control artifacts.
 
This model is legally established in modular construction.
 
=== Eliminate Rework ===
 
Target reduction: 0.3–0.5 LH/ft²
 
Rework is caused by ambiguity and field decisions.
 
Mechanism:
* No field interpretation
* No dimensional freedom
* No undocumented decisions
 
OSE action:
CAD-for-swarm is a first-class production output.
Every module includes:
* Defined ports
* Datum references
* Tolerance envelopes
 
If CAD does not exist, the module does not exist.
 
=== Eliminate Coordination Overhead ===
 
Target reduction: 0.3–0.5 LH/ft²
 
Coordination exists due to human-dependent sequencing.
 
Mechanism:
* Self-sequencing modules
* Geometry-enforced order
* Error-proofing
 
OSE action:
Assembly order is encoded in geometry.
Modules cannot be installed incorrectly.
If explanation is required, the system has failed.
 
=== Eliminate Training Drag ===
 
Target reduction: 0.2–0.3 LH/ft²
 
Training drag is driven by variance, not skill.
 
Mechanism:
* Short, repeatable task units
* Binary quality checks
* Visual instruction dominance
 
OSE action:
Tasks are designed for 15–30 minute execution windows.
Workers execute protocols rather than learning trades.
 
== Physics-Limited Residual Labor ==
 
After eliminations, remaining labor approaches the physical floor:
 
{| class="wikitable"
! Category !! LH/ft²
|-
| Physical assembly || 0.75–0.85
|-
| Logistics (irreducible) || ~0.10
|-
| Oversight || ~0.05
|-
| Residual friction || ~0.05
|-
| Total || ~0.95–1.05
|}
 
This is achievable without heavy robotics.
 
== Why OSE Can Achieve This ==
 
Commercial builders cannot reach this threshold due to:
* Fragmented incentives
* Trade silos
* IP enclosure
* Adversarial contracting
* Liability partitioning
 
OSE can achieve this because:
* Unified design authority
* Open CAD and documentation
* Integrated training and production
* Elimination of trade monopolies
 
This is an institutional architecture advantage, not a technology advantage.
 
== Required Precursor Deliverables ==
 
OSE must build the following before house-level optimization:
 
# Canonical module library
# CAD-for-swarm standards
# Time-lapse and AI quality control pipeline
# Module-level labor benchmarks
# Inspection pre-approval agreements
 
Only after these exist can house-level labor collapse toward 1.0 LH/ft².
 
== Bottom Line ==
 
Achieving 1.0 LH/ft² is feasible and defensible.
It is not optimistic and not a productivity claim.
It is the outcome of correct system design.
 
OSE succeeds by refusing to allow labor to exist where information should exist instead.

Revision as of 07:52, 30 January 2026

Build Time to 1.0 Labor-Hour per Square Foot

This page defines how Open Source Ecology (OSE) can credibly achieve approximately 1.0 all-in labor-hour per finished square foot (LH/ft²) for housing construction. This is not a productivity claim but a systems-design outcome based on structural elimination of labor categories.

Canonical Metric Definition

OSE uses a single, non-negotiable metric:

All-in Labor Hours per Finished Square Foot (LH/ft²)

This includes every human labor hour required to deliver a finished, inspected, code-compliant house, excluding land acquisition.

Included:

  • On-site and off-site fabrication
  • Logistics and material handling
  • Staging and setup
  • Coordination and supervision
  • Inspections and rework
  • Training inefficiency
  • Tooling setup
  • Punch lists and callbacks

Any metric that excludes these categories is not acceptable for system planning.

Industry Baseline

Conventional housing typically exhibits the following labor distribution:

Category Typical LH/ft²
Direct build labor ~0.85
Trade handoffs and waiting 0.40–0.60
Inspection friction 0.20–0.30
Rework and errors 0.30–0.50
Coordination and supervision 0.30–0.50
Logistics and staging 0.20–0.30
Training and variability 0.20–0.30
Total ~2.5–3.0

OSE’s objective is to remove approximately 1.5–2.0 LH/ft² by eliminating entire labor categories rather than compressing them.

Principle: Labor Is Eliminated, Not Optimized

OSE does not pursue 1.0 LH/ft² through:

  • Increased effort
  • Better management
  • Higher skill
  • Motivation
  • Lean terminology

OSE achieves 1.0 LH/ft² by making entire classes of labor structurally impossible.

Elimination Strategy

Eliminate Trade Boundaries

Target reduction: 0.4–0.6 LH/ft²

Rule: No build step may require waiting for another trade.

Mechanism:

  • Multi-trade modules (structure, wiring, boxes, air sealing combined)
  • No rough-in versus finish phases
  • No return visits

OSE action: Walls, floors, roofs, wet cores, and power centers are treated as atomic modules that are completed once, fully.

If a worker must return later, the design has failed.

Eliminate Inspection Labor

Target reduction: 0.2–0.3 LH/ft²

Inspections compensate for low process trust.

Mechanism:

  • Fixed module designs
  • Fixed fastener schedules
  • Fixed routing paths
  • Process verification instead of outcome investigation

OSE action: Modules are pre-approved. Inspectors verify that the approved process was followed, supported by time-lapse and AI-assisted quality control artifacts.

This model is legally established in modular construction.

Eliminate Rework

Target reduction: 0.3–0.5 LH/ft²

Rework is caused by ambiguity and field decisions.

Mechanism:

  • No field interpretation
  • No dimensional freedom
  • No undocumented decisions

OSE action: CAD-for-swarm is a first-class production output. Every module includes:

  • Defined ports
  • Datum references
  • Tolerance envelopes

If CAD does not exist, the module does not exist.

Eliminate Coordination Overhead

Target reduction: 0.3–0.5 LH/ft²

Coordination exists due to human-dependent sequencing.

Mechanism:

  • Self-sequencing modules
  • Geometry-enforced order
  • Error-proofing

OSE action: Assembly order is encoded in geometry. Modules cannot be installed incorrectly. If explanation is required, the system has failed.

Eliminate Training Drag

Target reduction: 0.2–0.3 LH/ft²

Training drag is driven by variance, not skill.

Mechanism:

  • Short, repeatable task units
  • Binary quality checks
  • Visual instruction dominance

OSE action: Tasks are designed for 15–30 minute execution windows. Workers execute protocols rather than learning trades.

Physics-Limited Residual Labor

After eliminations, remaining labor approaches the physical floor:

Category LH/ft²
Physical assembly 0.75–0.85
Logistics (irreducible) ~0.10
Oversight ~0.05
Residual friction ~0.05
Total ~0.95–1.05

This is achievable without heavy robotics.

Why OSE Can Achieve This

Commercial builders cannot reach this threshold due to:

  • Fragmented incentives
  • Trade silos
  • IP enclosure
  • Adversarial contracting
  • Liability partitioning

OSE can achieve this because:

  • Unified design authority
  • Open CAD and documentation
  • Integrated training and production
  • Elimination of trade monopolies

This is an institutional architecture advantage, not a technology advantage.

Required Precursor Deliverables

OSE must build the following before house-level optimization:

  1. Canonical module library
  2. CAD-for-swarm standards
  3. Time-lapse and AI quality control pipeline
  4. Module-level labor benchmarks
  5. Inspection pre-approval agreements

Only after these exist can house-level labor collapse toward 1.0 LH/ft².

Bottom Line

Achieving 1.0 LH/ft² is feasible and defensible. It is not optimistic and not a productivity claim. It is the outcome of correct system design.

OSE succeeds by refusing to allow labor to exist where information should exist instead.

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