How commercial property estimating differs from residential

A residential estimate typically starts from a known, stable occupancy: a single-family house repaired like-kind-and-quality to its pre-loss condition. A commercial estimate starts by establishing what the space is used for and whether that use is still permitted at the current code cycle. Occupancy classification (assembly, mercantile, business, industrial, storage) drives egress requirements, fire separation, sprinkler and alarm rules, and accessibility standards that a repair may have to meet even when the original construction predates them.

This matters because a repair that looks identical to the pre-loss condition can still fail a permit review if the jurisdiction requires the repaired area to be brought up to current code once a threshold of damage or cost is reached. Estimators have to identify that threshold early, because it changes both scope and price, and because it is the kind of item a carrier will ask to see justified with a code citation or permit correspondence, not just an estimator's assertion.

Commercial buildings carry building systems that residential structures either lack or run at much smaller scale: fire suppression and alarm, commercial HVAC (rooftop units, VAV boxes, chillers), elevators, commercial kitchen exhaust, backup power, and building-wide life-safety systems. Damage to one system frequently forces sequencing decisions — an electrical shutdown for safety can stop mitigation on unrelated floors, or a fire-panel outage can require a fire-watch cost that itself belongs in the estimate.

Because these systems are usually installed and serviced by specialty trades, a commercial scope is assembled from more separate trade inputs than a typical residential one: a mechanical contractor's assessment of a rooftop unit, an electrician's finding on panel damage, a fire-protection contractor's inspection of a sprinkler zone. The estimator's job is to hold these trade inputs together into one coherent, priced scope rather than to personally diagnose each system.

A homeowner's claim usually has one insured, one lender at most, and one policy. A commercial loss routinely has several interested parties reading the same estimate for different reasons: the building owner, one or more tenants, a property manager, a lender with a mortgagee clause, and sometimes a franchisor with its own build-out standards. Each may have a different, narrower interest in the scope — the owner in the building shell, the tenant in their space and their business personal property, the lender in preserved collateral value.

Lease language decides who is financially responsible for what. Most commercial leases assign responsibility for the base building to the landlord and for the tenant's space, fixtures, and improvements to the tenant, but the exact split — and which party's insurance is expected to respond first — is set by the lease, not by convention. An estimator who has not read the relevant lease clause is guessing at a boundary that the documents actually define.

Commercial property policies typically separate the physical building from business personal property (BPP) — the contents, furniture, fixtures, equipment, stock, and supplies used to run the business — as distinct coverage parts, each with its own limit. An estimate has to keep these separated cleanly: a damaged rooftop HVAC unit belongs to the building; the damaged inventory in the stockroom belongs to BPP. Mixing the two under one limit misstates both.

Tenant improvements and betterments (TIB) sit in between. These are the fixtures and finishes a tenant installed or paid for in a leased space — custom millwork, specialized flooring, built-in equipment enclosures. Whether TIB is covered under the building policy, the tenant's own policy, or split by lease agreement depends on the lease and the specific coverage forms in force, and it has to be identified as its own scope category rather than folded into either building or BPP by default.

Commercial losses are usually scoped in phases rather than all at once: emergency mitigation and stabilization first, then structural and building-system repair, then tenant finish and TIB, with business-income and extra-expense questions running in parallel to all three. Each phase can be documented, reviewed, and partially approved on its own timeline, which means the estimate as a whole is a living document with a revision history, not a single static number produced after one site visit.

That structure requires more documentation per dollar of loss than a comparable residential claim: code citations for upgrade items, trade reports for building systems, lease excerpts for TIB and BPP boundaries, and often an engineer's letter where structural repair is involved. A commercial estimate that cannot show where each of these inputs came from is harder to defend when a reviewer asks why a line item exists.

Because more parties have a stake in the outcome, a commercial estimate typically passes through more review before it is treated as final: an internal or public adjuster review, a carrier examiner or independent adjuster review, and sometimes a third-party engineer or general contractor review of specific trade scope. Each reviewer is checking a different thing — coverage fit, code justification, pricing reasonableness, or constructability — and the estimate needs to hold up to all of them without being rebuilt for each audience.

In practice this means every material line item should carry a plain answer to three questions before it reaches a second reviewer: what evidence supports it, what code or lease provision justifies it if it is not a like-kind repair, and which coverage part (building, BPP, or TIB) it belongs to. An estimate that answers those three questions consistently moves through multi-party review far faster than one that leaves them implicit.

Commercial coverage records and the co-insurance calculation are in production for early-access users as a beta feature: coverages are recorded per estimate, and the calculation runs, can be accepted, or can be overridden with a documented reason. If a required input for a calculation is missing, PaxExact says so explicitly rather than guessing at a number.