Updated August 17, 2026. This guide provides general appraisal information and is not legal, tax or accounting advice.
Define what is actually unusual
A property may be unique because of architecture, size, acreage, waterfront, quality, condition, multiple dwellings, equestrian improvements, commercial-style outbuildings or an unusual location. Each feature affects the search differently.
The appraiser should separate features that create market appeal from features that are costly but have limited buyer demand.
Expand the search intelligently
When close substitutes do not exist, the appraiser may use older sales, a broader geographic area or properties that match different components of the subject. The goal is not to find a perfect twin; it is to assemble credible evidence.
Market areas should be expanded based on buyer behavior, not municipal boundaries alone.
Verify the property carefully
Surveys, floor plans, permits, utility information, construction details, leases and photographs help reduce uncertainty. Gross living area, finished basement, accessory dwelling space and detached improvements should be identified consistently.
For rural or waterfront properties, access, frontage, topography, utilities, wetlands and functional land use may be as important as total acreage.
Expect more explanation
Complex assignments often need more narrative discussion and reconciliation than standard subdivision reports. Adjustments may be supported by paired data, grouped market evidence, cost information, sensitivity testing and qualitative analysis.
A credible report should make the reasoning understandable without pretending that thin data are more precise than they are.
Planning checklist
- Provide a current survey or tax map
- Identify all living units and finished areas
- List accessory buildings and their actual use
- Document major custom construction features
- Explain water, septic, access and utility systems
- Provide permits or plans for additions
- Allow time for an expanded market search
Describe the property, intended use and required effective date before scheduling so the scope can be matched to the assignment.
Request an AppraisalFrequently asked questions
Can an appraisal be completed without a nearly identical sale?
Yes. Appraisers often combine multiple imperfect indicators and explain how each one informs the value conclusion.
Is every outbuilding worth its construction cost?
No. Contribution depends on utility, condition, size, location and demand among likely buyers.
Why might comparable sales be farther away?
Buyers of unusual properties may search across a broader region. The appraiser should explain why the expanded area competes for the same buyers.
Does uniqueness always increase value?
No. Some unique features increase appeal; others narrow the buyer pool or create maintenance and functional concerns.