Seed Eco-Home Optimized Build Time: Difference between revisions

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(source-[https://chatgpt.com/share/6968f11b-f07c-8010-915c-5b687d7f7891])
(source-[https://chatgpt.com/share/6968f11b-f07c-8010-915c-5b687d7f7891])


=Assumptions=
=Significance=

Revision as of 14:13, 15 January 2026

May 1 Labor Target – Phase Breakdown (per 1,000 ft² Seed Eco-Home)

  • Note: the core size for SH6, SH7, and SH8 is 720 square foot, with expansion at about 1400 sf.
  • We can test in 2 phase - total at the 720 core, and total at the full expanded version.
  • The 720 sf core has all utilities, so it will be the more time intesive one - while the completion will be much faster.

Assumptions:

  • Repeatable design, low roof complexity
  • Tight logistics (kitted, staged materials)
  • Minimal rework
  • Utilities not extreme
  • KPI = On-site person-hours (track prefab separately if applicable)

A) Site Prep & Foundation

  • Scope: layout, excavation, foundation system, backfill/rough grade
  • Target: 70–110 hours

B) Structural Shell

  • Scope: floor (if any), walls, roof, sheathing, WRB, dry-in
  • Target: 120–170 hours

C) Exterior Close

  • Scope: windows/doors, roofing, siding/cladding
  • Target: 60–90 hours

D) MEP (Mechanical, Electrical, Plumbing)

  • Scope: plumbing + electrical + HVAC rough/trim (simplified routing assumed)
  • Target: 100–150 hours

E) Insulation & Air Sealing

  • Scope: insulation install, air sealing details
  • Target: 20–35 hours

F) Interior Finishes

  • Scope: wall finish, paint, flooring, cabinets/trim, fixtures/appliances
  • Target: 110–170 hours

G) Commissioning, Punch, Cleanup

  • Scope: system checks, punch list, final clean
  • Target: 20–25 hours

Totals

  • Low-end total: 500 hours
  • High-end total: 750 hours

Measurement Protocol

  • Headline KPI: On-site person-hours (every human hour on site counts)
  • Include: supervisors, material handling, cleanup, rework, waiting
  • Exclude from headline (track separately): design/engineering, procurement/admin, marketing/sales
  • Optional secondary KPI: Total person-hours including off-site prefab

Build-Day Scorecard

Phase Actual Hours Target Variance
A) Site & Foundation 70–110
B) Structural Shell 120–170
C) Exterior Close 60–90
D) MEP 100–150
E) Insulation & Air Sealing 20–35
F) Interior Finishes 110–170
G) Commissioning 20–25
TOTAL 500–750

(source-[1])

Significance

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