Certified General Appraiser common mistakes
Certified General Appraiser · Understand the traps and how to avoid them.
Applying the Income Approach by capitalizing a single year's net operating income without reconciling the stabilized estimate against market-extracted capitalization rates, and without testing the implied value against the Direct Capitalization vs. Yield Capitalization assumptions.
Candidates memorize the formula V = NOI / R but skip the step of verifying that the NOI is stabilized (not a lease-up or below-market year) and that the cap rate was extracted from comparable sales of similar risk, location, and income durability. The exam often supplies a below-market rent or a vacancy/collection allowance that must be adjusted before capitalizing.
What to do instead
Before dividing, write out the stabilized NOI line by line: potential gross income at market rent, vacancy and collection loss, operating expenses (excluding debt service, depreciation, and capital expenditures), and reserves. Then extract the cap rate from the comparable sales given and confirm the property's risk profile matches. If the problem gives a below-market lease, adjust rent to market and account for the lease term.
Treating the Cost Approach as always applicable and failing to recognize when depreciation (physical, functional, external) cannot be reliably estimated, such as for older or specialized properties.
Candidates learn the cost approach formula (replacement cost new minus depreciation plus land value) and apply it mechanically, even when the improvement is old enough that accrued depreciation is not measurable or when external obsolescence dominates. The exam tests whether you know the approach is most reliable for new construction or special-purpose properties.
What to do instead
State applicability explicitly: the cost approach is most defensible for new or nearly new improvements and special-purpose properties with no comparable sales. When depreciation cannot be supported, say so and weight the approach accordingly. When estimating depreciation, separate physical deterioration (curable/incurable, short/long-lived), functional obsolescence, and external obsolescence, and show the calculation for each.
Concluding highest and best use from the property's current use or from what the owner wants, rather than testing the four criteria (legally permissible, physically possible, financially feasible, maximally productive) as of the effective date.
Candidates confuse the current use with the highest and best use, or they skip the legally permissible screen and jump to financial feasibility. The exam often presents a property whose current zoning or deed restriction rules out the most profitable use, or whose current use is interim.
What to do instead
Run the four tests in sequence and document each: (1) legally permissible uses under zoning, deed restrictions, and easements; (2) physically possible given site size, topography, and access; (3) financially feasible uses producing a positive return; (4) maximally productive among feasible uses. Tie the conclusion to the effective date and to the property as though vacant and as improved.
Failing to reconcile the value indications from the three approaches into a single supported opinion, instead averaging them or defaulting to one approach without justification.
Candidates treat reconciliation as arithmetic averaging, which ignores the reliability and applicability of each approach for the subject property type. The exam tests whether you can weight the approaches based on data quality, property characteristics, and intended use.
What to do instead
In reconciliation, state which approach is most reliable and why, then weight accordingly. For example, for an owner-occupied special-purpose building, the cost approach may carry the most weight; for a stabilized apartment, the income approach; for a typical residence, the sales comparison approach. Explain why the other indications are less reliable rather than simply averaging.
Ignoring the USPAP requirement to identify the intended use, intended users, and the scope of work before selecting approaches and data, and failing to include a scope of work statement in the report.
Candidates focus on the valuation math and treat USPAP as a checklist of report sections. The exam tests whether you understand that scope of work is determined by the problem and must be stated, and that intended use drives the level of detail.
What to do instead
At the start of every assignment, document: the client and intended users, intended use, type and definition of value, effective date, subject property, and assignment conditions. Then state the scope of work actually performed and why it is sufficient. In the report, ensure the scope of work section appears and is consistent with the approaches used.
Confusing the definitions of value (market value, market rent, investment value, use value, insurable value) and using them interchangeably in the report.
Candidates learn the market value definition but apply it loosely, or they use 'market value' when the assignment requires investment value or use value. The exam tests whether the value definition matches the intended use and the client's question.
What to do instead
Select and quote the applicable definition, and make sure the data and approaches are consistent with it. For example, investment value may reflect a specific investor's financing and tax position, while market value assumes a typical buyer. State the definition in the report and do not mix indications derived under different definitions.
Misapplying the sales comparison approach by failing to make and support adjustments for differences between comparables and the subject, or by adjusting the comparable in the wrong direction.
Candidates memorize adjustment categories (location, size, condition, time) but lose track of direction: if the comparable is superior, the adjustment to the comparable is downward, and vice versa. They also fail to support the adjustment amount with market evidence.
What to do instead
For each comparable, list the elements of comparison and state whether the comparable is superior, inferior, or similar. Adjust the comparable toward the subject: superior comparable gets a negative adjustment, inferior gets positive. Support each adjustment with paired sales, cost data, or market extraction, and keep a running adjusted value per comparable before reconciling.
Treating the three approaches as independent and failing to check for consistency, such as a cost approach value that implies a land value inconsistent with the sales comparison approach, or an income approach value that implies an implausible cap rate.
Candidates compute each approach in isolation and do not cross-check the implied inputs. The exam tests whether you can spot internal inconsistencies that signal an error.
What to do instead
After computing each approach, back-solve for the implied inputs: land value from the cost approach, cap rate from the income approach, and price per square foot from the sales comparison approach. Compare these to market evidence and to the other approaches. If the implied land value or cap rate is out of line, revisit the inputs before reconciling.
Writing a report that omits required USPAP content, such as the certification, assumptions and limiting conditions, or the statement of the scope of work, or that fails to disclose extraordinary assumptions and hypothetical conditions.
Candidates treat report writing as narrative prose and neglect the required elements. The exam tests whether you know which items are required in every report and which are required only when applicable, and whether extraordinary assumptions and hypothetical conditions are properly disclosed.
What to do instead
Use a report checklist derived from USPAP: identification of the client and intended users, intended use, type and definition of value, effective date, scope of work, data and analysis, reconciliation, certification, and assumptions and limiting conditions. Whenever you rely on an extraordinary assumption or hypothetical condition, state it, explain why it is necessary, and show its effect on value.
Failing to recognize and disclose an appraiser's conflict of interest, competency limits, or the need to decline or withdraw when the assignment cannot be performed competently.
Candidates focus on technical valuation and overlook the ethics and competency provisions of USPAP. The exam tests whether you know that an appraiser must disclose any interest in the property, must not accept an assignment outside their competence without disclosure, and must not condition compensation on a predetermined value.
What to do instead
Before accepting, screen for conflicts (ownership, prior involvement, fee contingent on value) and for competency (property type, market, and approach). If a competency gap exists, disclose it and take steps to become competent or decline. In the report, include the certification and any required disclosures, and never accept an assignment conditioned on a specific value outcome.