Market conditions analysis is how an appraiser decides whether prices, supply, and marketing time in the subject’s competitive market are increasing, stable, or declining — and whether comparable sales need time (market-conditions) adjustments between contract date and the appraisal’s effective date. It is not a county median pasted into a report, and it is not a lifestyle narrative.
This educational briefing explains the statistics appraisers actually use, why broad medians mislead, how paired sales and stratified stats interact, and what belongs in market-conditions commentary (including why Fannie Mae no longer requires Form 1004MC). Citations are to Fannie Mae Selling Guide guidance and Appraiser Update articles current as of research on September 5, 2026.
What “Market Conditions” Means in an Appraisal
In GSE mortgage appraisal practice, the appraiser reports an overall property-value trend (increasing, stable, or declining) based on analysis of the competitive market, and separately decides whether each comparable needs a market-conditions adjustment for the period between that sale’s contract date and the effective date of the appraisal. Fannie Mae’s illustration of market-condition adjustments shows that the overall 12-month trend and the adjustment on an individual comparable are related but not identical — different comps can receive positive, negative, or zero adjustments in the same report depending on when they went under contract (Fannie Mae — Market Condition Adjustments; Selling Guide B4-1.3-09).
Fannie Mae’s March 2026 Appraiser Update reiterates that appraisers must analyze changes from each comparable’s contract date to the effective date and make time adjustments when indicated. Failure to make clearly indicated time adjustments is an unacceptable appraisal practice. Acceptable support includes paired sales, statistical analysis, modeling, and home price indices; the report must summarize data sources, tools, and techniques (Fannie Mae Appraiser Update, March 2026; also April 2025 Appraiser Update on B4-1.3-09).
Core Metrics — Defined Without Lifestyle Language
- Median vs average (mean) price: The median is the middle closed sale in a ranked list; the mean is the arithmetic average. A few very high or very low closings pull the mean more than the median. Appraisers often track both, but neither replaces a subject-specific comps grid.
- Sale price vs sale-to-list ratio: Sale-to-list compares closed price to the last asking price (definitions vary by data vendor — always state the definition used). It is a price-discovery statistic, not a quality-of-life label.
- Days on market (DOM) / marketing time: Measures how long listings take to contract or close under the data source’s clock. Useful for supply/demand commentary when the competitive set is defined correctly.
- Inventory and months of supply (MSI): Active listings relative to a sales pace (often expressed as months of supply). Rising MSI with falling sales volume can support a softer price trend; the reverse can support a stronger trend — always within the defined competitive market and property type.
- Absorption / sales volume: Count of closed (or pending) sales in a period. Volume changes help interpret whether a median move is broad-based or thin-sample noise.
- Price bands by property type: Single-family, condominium, and 2–4 family product often move differently. A “town median” that mixes those types can obscure the band that actually competes with the subject.
| Metric | What it helps answer | Common misuse |
|---|---|---|
| County or borough median | Very coarse regional context | Treating it as the subject’s value trend |
| Subject-zip or village median | Closer context if property mix is similar | Ignoring condo vs SF splits inside the same zip |
| Competitive-set median / paired sales | Support for time adjustments and trend | Too few sales presented as a precise monthly rate |
| DOM / MSI | Supply and marketing-time evidence | Comparing unlike listing populations |
| Sale-to-list | Negotiation / list-price accuracy evidence | Assuming it equals appreciation |
No numeric Westchester or NYC market figures are quoted here — publicly scrapeable current medians were not verified for this post without blocked vendor pages. Could not verify: live Redfin/Zillow/OneKey summary tables at research time.
Why Borough and County Medians Mislead
A Westchester County median, a Manhattan borough median, or a Fairfield County median mixes unlike product: waterfront and inland, condominium and fee-simple single-family, renovated and deferred-maintenance stock, and widely different price bands. The subject’s competitive market is the set of properties that would attract the same purchaser on location, utility, and price band — usually much narrower than a county.
Fannie Mae expects the Neighborhood / market-conditions discussion to reflect the market in which the subject competes, with property-value trend based on a minimum of 12 months of data from acceptable sources such as MLS, home price indices, and models (see December 2024 Appraiser Update discussion of B4-1.3-03 / B4-1.3-09 updates). A county median can be background; it is not a substitute for that competitive-market analysis.
Paired Sales vs Broad Statistics
- Broad statistics (medians, MSI, DOM, HPIs) describe the direction and pace of a defined market. They are strong for trend context and for supporting a time-adjustment rate when the sample matches the competitive set.
- Paired sales isolate the effect of time (or another feature) by comparing sales that are alike except for the element being measured. They are powerful when available, but thin markets may not yield clean pairs.
- Best practice: Use stratified stats for context and, where possible, reconcile to pairs or to an HPI/model rate — then apply that rate (or a supported zero) to each comparable based on its contract date. Fannie Mae accepts HPIs, statistical analysis, modeling, and paired sales; stating “no adjustment” still requires the same rigor as stating an adjustment rate (March 2026 Appraiser Update tip).
What Belongs in Market-Conditions Commentary (and What Does Not)
Belongs:
- Definition of the competitive market (geography, property type, price band)
- Data sources and date range (MLS export date, HPI name, etc.)
- Direction of prices, inventory/MSI, DOM, sale-to-list, and volume — with figures only when sourced
- How the time-adjustment rate (or zero rate) was derived and applied to each comparable
- Recognition when a comparable’s contract date falls outside the analysis window (a recurring issue flagged by Fannie Mae)
Does not belong:
- Commentary about local institutions, public-safety anecdotes, or population composition
- Neighborhood-quality adjectives or lifestyle marketing language
- Unsourced medians or invented monthly appreciation rates
- Using retired Form 1004MC as the sole support for time adjustments — Fannie Mae no longer requires 1004MC (effective August 7, 2018) and has noted it does not exist in UAD 3.6; appraisers must still analyze and report market conditions (Fannie Mae Appraisal FAQ — 1004MC; March 2026 Appraiser Update)
Market-Conditions Addendum / Commentary Checklist
- Name the competitive market and property type clearly
- Cite data sources and the effective date of the statistics
- Report price trend, supply, marketing time, and sale-to-list with definitions
- Explain the time-adjustment method (pairs, stats, HPI, model) and the rate used
- Support zero adjustments with the same evidence standard as non-zero adjustments
- Keep commentary fact-based and objective (Selling Guide expectation)
Sources
- Fannie Mae — Market Condition Adjustments (illustration; Selling Guide B4-1.3-09)
- Fannie Mae Appraiser Update — March 2026 (Market Conditions Analysis Letters)
- Fannie Mae Appraiser Update — April 2025 (time-adjustment policy language)
- Fannie Mae Appraiser Update — December 2024 (Neighborhood / trend data expectations)
- Fannie Mae Appraisal and Property-Related FAQs (1004MC no longer required as of Aug 7, 2018)
Final Thoughts
Strong market-conditions analysis is narrow, sourced, and tied to the subject’s competitive set. Median versus average, inventory/MSI, DOM, sale-to-list, absorption, and price-band splits are tools for describing price and supply — not for labeling places. Borough and county medians are context at best. Paired sales and broad stats work together when the sample is honest. And whether or not a lender still asks for a 1004MC PDF, the appraiser’s obligation to analyze and support market conditions — including time adjustments — remains.
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