Market value is the most probable price a property should bring in a competitive and open market, under all the conditions of a fair sale, with buyer and seller each acting prudently and knowledgeably and the price not affected by undue stimulus. That is the wording federal banking regulators publish at 12 CFR 34.42(h) for appraisals in federally related transactions. In plain words: what an informed buyer would most likely pay an informed seller after the house had a fair showing on the open market, paid in cash or its equivalent, with no special deal bending the price.
Below, the definition one phrase at a time, then how an appraiser applies it to a house in Claremont. It sits behind every number described in the four different numbers a house can carry.
The definition, one phrase at a time
- "Most probable price." Not the highest price anyone might pay and not the lowest a seller might accept: the likeliest. An appraiser reaches it through closed sales, because a closed sale is a price a buyer actually paid.
- "Competitive and open market." The property is offered to the buying public, not to one buyer chosen in advance.
- "Buyer and seller are typically motivated." Neither is forced to act. A sale made under pressure, such as a quick sale to settle a debt, does not meet this condition.
- "Well informed or well advised." Both sides know the property, including what a buyer would learn: the condition of the roof, whether the rear addition was permitted, how the lot is used.
- "A reasonable time is allowed for exposure." Exposure time is the period a property would have been offered on the market before selling at market value on the effective date, the date the opinion of value applies to. A price set without that exposure is something else.
- "In terms of cash in U.S. dollars." Or in financial arrangements comparable to cash: the price is stated as if paid in cash or with ordinary financing, so a price raised by unusual seller financing does not count as market value.
- "Unaffected by special or creative financing or sales concessions." When a seller pays a buyer's costs or offers terms the market does not normally see, the price reflects that deal, and an appraiser adjusts for it when that sale is used as a comparable.
What market value is not
Several numbers get called "what the house is worth" that the definition does not describe.
- The list price. An asking price is a seller's choice, not a sale.
- A single offer. A cash offer is the price one buyer will pay on that buyer's terms; a cash offer is not an appraisal, and because it skips open-market exposure it is not market value by definition either.
- An online figure. An automated estimate, such as a Zestimate, is a statistical estimate produced by an algorithm from records and nearby sales; an automated estimate is not an appraisal, and it never sees the inside of the house.
- An agent's price opinion. A comparative market analysis (CMA), a licensed agent's opinion of likely list or sale price, is built for pricing a listing; an agent CMA is not an appraisal.
- The assessed value. A county assessment is not an appraisal: it is the taxable value under California Revenue and Taxation Code section 51, the lesser of a factored base year value and the full cash value on the January 1 lien date.
None of them was built to answer the definition. Theappraisal vs. estimate page compares the estimate, the CMA and the appraisal directly.
Is there only one definition?
No, and that is why every appraisal report names the one it uses. USPAP, the Uniform Standards of Professional Appraisal Practice, does not fix a single wording; it requires the appraiser to identify the type and definition of value and cite its source. A report for a mortgage lender uses the federal wording above. A California property tax matter turns on full cash value, which Revenue and Taxation Code section 110 defines as the amount of cash or its equivalent a property would bring if exposed for sale in the open market, where neither buyer nor seller could take advantage of the exigencies of the other and both know the uses the property is adapted to.
The two are close cousins. Which one a report states is set by its intended use, what the report will be used for, and for an estate, a trust or a divorce your attorney or CPA decides which definition the matter calls for. Nothing here is legal or tax advice.
How an appraiser applies the definition in Claremont
The definition says "most probable price in an open market". In Claremont, the first question is which market. One ZIP code, 91711, holds several, and a buyer for one is rarely shopping the others.
- Choose the sales a buyer of this house would have weighed. A pre-1940 Craftsman near the Village and the Colleges is compared with other older houses of its era and style, not with postwar ranch tracts north of Foothill Boulevard. A Claraboya or Padua Hills hillside home is compared with other homes sold on view, grade and access, even when that widens the search.
- Measure what is there. Gross living area, the finished space above grade, is measured from the outside of the house, because older houses often carry enclosed porches and back rooms that public records missed. Permit history decides how an addition or an ADU is treated.
- Adjust for the differences buyers pay for. Lot size, condition, view, living area, and location relative to the 10, the 210 and the county line are the recurring adjustments, each one explained.
- Handle the county line openly. A sale from Upland or Montclair, across Mills Avenue in San Bernardino County, is used only when it is genuinely better evidence, with the location adjustment stated.
- Tie it to one date. Market value is always "as of" the effective date. A later sale or a market shift does not change an opinion made as of an earlier date.
The Claremont area page lists the pockets and what a reviewer throws out when comparables cross them carelessly.
Why the definition matters to you
When two numbers for your house disagree, the definition tells you which conditions each one met. An offer from one buyer skipped the open market; an assessment may follow a base year set long ago. The difference between that opinion and the definition it aims at is explained in appraised value vs. market value, and who a report is written for in what appraised value is and who it is written for.
Next step
If a lender, an estate, a court or a tax matter needs an opinion of market value for a house in Claremont or nearby, request an appraisal or call (909) 324-6122. The definition of value, the intended use and the effective date are agreed before work begins, and the fee, set by the scope of the assignment and quoted before work begins, does not depend on the value. More on the vocabulary of value is in the value types knowledge center.
Sources
- Electronic Code of Federal Regulations, 12 CFR 34.42(h), definition of market value: https://www.ecfr.gov/current/title-12/chapter-I/part-34/subpart-C/section-34.42 (accessed October 30, 2026)
- California Revenue and Taxation Code section 110 (full cash value or fair market value): https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC§ionNum=110 (accessed October 30, 2026)
- California Revenue and Taxation Code section 51 (taxable value): https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC§ionNum=51 (accessed October 30, 2026)
- The Appraisal Foundation, Uniform Standards of Professional Appraisal Practice (USPAP): https://appraisalfoundation.org/imis/TAF/Standards/Appraisal_Standards/Uniform_Standards_of_Professional_Appraisal_Practice/TAF/USPAP.aspx (accessed October 30, 2026)
- California Bureau of Real Estate Appraisers, license lookup: https://www2.brea.ca.gov/breasearch/faces/party/view.xhtml?id=23601 (accessed October 30, 2026)
Gordon Hall, California Certified Residential Real Estate Appraiser, BREA No. AR003877 (lookup: https://www2.brea.ca.gov/breasearch/faces/party/view.xhtml?id=23601). Reports are prepared in conformity with the Uniform Standards of Professional Appraisal Practice (USPAP). Nothing here is legal or tax advice; admissibility is always the court's decision.
Frequently asked questions
Is market value the same as what my house would sell for?
Not exactly. Market value is the most probable price after a fair exposure to the open market, between a typically motivated, informed buyer and seller, paid in cash or comparable terms. An actual sale can land above or below it if one of those conditions is missing, such as a rushed sale, a buyer paying for a personal reason, or seller concessions.
Is market value the same as fair market value?
They are close but come from different rules. Federal banking regulators define market value at 12 CFR 34.42(h). California's Revenue and Taxation Code section 110 uses full cash value or fair market value for property tax. An appraisal report names the definition it uses and cites its source, and your attorney or CPA decides which one a filing needs.
Does market value change after an appraisal is done?
The market can change, but an appraisal's opinion of market value is made as of its effective date, the date the opinion applies to. A later sale or a market shift does not change an opinion made as of an earlier date; a new date calls for a new assignment.
Do list prices or online estimates count as evidence of market value?
Not as primary evidence. An appraiser relies on closed sales, which are prices buyers actually paid. A list price is a seller's asking figure, and an automated estimate such as a Zestimate is a statistical estimate that is not an appraisal. Either may be noted for context, but neither is a sale.
