Commercial vs. Residential Water Losses: What Changes

The physics of water don't change between a 2,000 sq ft home and a 40,000 sq ft office building. But almost everything else does — who authorizes work, how much documentation is required, what equipment fits through the door, and how you get paid.

Authorization Chain

Residential: the homeowner signs a WOSA and you start. Commercial: you may need signoff from a facility manager, a corporate risk department, and sometimes the tenant's insurance carrier. Never start extraction without written authorization from someone with contractual authority.

Equipment Scale

• Commercial losses often require 20–100+ air movers and desiccant dehumidifiers instead of LGR refrigerants.
• Chambering becomes almost mandatory to keep dehu load reasonable — see building a drying chamber.
• 3-phase power availability changes what equipment you can run.

Documentation Intensity

Commercial adjusters want everything: daily moisture logs, equipment run-time logs, temperature/RH readings at multiple locations, chamber pressure differentials, and photographic proof of every drying decision. See what insurance adjusters want — then double it for commercial.

Business Interruption Pressure

Every hour a hotel room, restaurant, or office is offline is billed against the loss. Commercial losses run 24/7 with rotating crews. Air moving and dehumidification never stop.

Pricing Differences

Commercial jobs use different Xactimate rate schedules and often T&M billing above certain thresholds. See our pricing guide and the Xactimate primer.

Certifications That Open Doors

WRT gets you in the door. For commercial water losses at scale, add ASD (Applied Structural Drying) and CDS (Commercial Drying Specialist). See WRT vs ASD vs AMRT. Learn more about the CDS pathway on the IICRC certifications page.

Sharpen your commercial-scenario judgment on the WRT exam simulator.