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New-home plumbing, electrical, gas, and HVAC rough-ins before insulation checklist

A coordinated pre-insulation new-home rough-in checklist for approved layouts, structural penetrations, piping and drains, gas and venting, electrical circuits and boxes, HVAC ducts and refrigerant lines, ventilation, fireblocking, testing, inspections, photographs, and correction release before cavities are filled.

6 items to check

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Fixture, equipment, panel, device, duct, pipe, vent, and control locations match plans and selections

Critical item

Rough-in locations should coordinate with actual products, finishes, structure, cabinets, doors, service access, and owner options.

Drilling, notching, cutting, boring, and fastening preserve approved framing

Critical item

Trade penetrations should remain within prescriptive or engineered limits and include required protection from future fasteners.

Water, drainage, vent, gas, combustion, and condensate rough-ins are supported and tested

Critical item

Piping, slope, support, protection, shutoffs, vents, drains, relief paths, and test procedures should meet adopted and product requirements.

Electrical service, panels, circuits, boxes, grounding, bonding, and protective-device locations are coordinated

Critical item

Electrical rough-in should match approved load and circuit plans, equipment nameplates, box-fill and support requirements, and required protection locations.

HVAC distribution, returns, exhausts, outdoor-air paths, refrigerant lines, and controls are installation-ready

Critical item

Mechanical rough-in should reflect design airflow, pressure, moisture, combustion, noise, service, and exact equipment requirements.

Tests, rough inspections, fireblocking, corrections, and complete cavity photographs are released

Critical item

Cavities should remain open until applicable trade inspections and corrections are accepted and the final hidden-work record is complete.

Use after major rough-in systems are installed and tested but before insulation, air sealing, drywall, cabinets, tubs, or other finishes reduce visibility. Qualified trades and the AHJ control testing and approval; homeowners should not energize, pressurize, or open systems. Do not enter unsupported excavations, walk incomplete framing or roofs, open energized equipment, operate pressurized systems without authorization, or interfere with required inspections. Use qualified inspectors and licensed trades for inaccessible, structural, electrical, gas, mechanical, environmental, or life-safety conditions.

Reference standards

  • Approved plans and specifications, signed purchase or construction agreement, selections and allowances, adopted state and local codes, permit and inspection conditions, authority having jurisdiction requirements, builder warranty documents, utility requirements, qualified design, and exact product manufacturer instructions
  • Plumbing, fuel-gas, electrical, mechanical, ventilation, fireblocking, equipment, duct, piping, wiring, and penetration-system instructions

    • Tools

  • Current plans, specifications, selections, contract, change orders, permit records, inspection approvals, and warranty documents
  • Camera, flashlight, tape measure, level, outlet or fixture test tools used only where owner-safe, and dated location-based photographs
  • Written deficiency log with location, controlling document, responsible party, correction evidence, and release decision

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