The complaint arrives in the same words every time: "I paid, and the report told me nothing the county GIS didn't." "There isn't a single source in it." "I can't even save it as a PDF." "How did they get that number?" The pattern behind these sentences is not a bug. Resellers of public records and lead-generation calculators sell the raw county file with a value stamped on top, because evidence costs effort and invites questions. Below: what the free records give you, what a report must add before it is worth money, and what to do if you already paid for one that falls short. For the machinery itself, start with how an automated valuation model reaches its number.
The report had no more information than the public records: why that happens
Three kinds of businesses sell "property reports", and none of them is in the valuation trade. Records resellers download the assessor roll and the recorder's index, add a search box and a logo, and charge for what the county hands out at no charge. Lead-generation calculators show a value to collect your phone number and sell it to agents; the paid "full report" is an afterthought. Subscription data sites bundle the two behind a monthly fee. In each model the value is a model output nobody intends you to inspect, so the document carries no sources.
The Maricopa County Assessor, to take one large county, lets anyone search parcels by address, open a parcel viewer with maps, use a GIS portal and download its data files without an account or a fee1. Recorders work differently: the Los Angeles County Registrar-Recorder lets any member of the public search and request recorded real-estate documents going back to 1850, but does not post its records or index online, citing a Government Code section on the home addresses of elected and appointed officials, and supplies copies on request online, by mail, by fax or in person2. A reseller's "deed history" tab is usually that index, bought in bulk and re-sold by the lookup.
So when the report repeats the square footage, year built, lot size and assessed value you had already seen on the county map, you have bought a copy of the public record. The value on top is the only thing the vendor made, and the one thing the document does not explain. That makes "how did they get that number" the right question, and a published standard answers it.
How did they get that number? The evidence a valuation has to show
Banking regulators wrote down what they expect a value estimate to contain before a lender relies on it, and the list is a fair yardstick for anything you pay for. The Interagency Appraisal and Evaluation Guidelines of December 10, 2010 expect an evaluation to describe the analysis performed and the supporting information used, and to indicate all sources of information: external data such as market sales databases and public tax and land records, property-specific data such as previous sales and comparable sales, evidence of an inspection, photos and a description of the neighborhood. The content should be documented in the credit file or reproducible, and an automated model may be used only when the resulting evaluation meets all of those expectations3.
For the comparables themselves, Fannie Mae's Selling Guide sets the level of detail: at least three closed sales in the sales comparison approach, each with its distance from the subject stated in miles with a directional indicator and measured in a straight line, and any sale from a competing neighborhood flagged with its differences addressed4. Neither text binds a consumer report, but both describe the minimum that makes a number checkable.
| Element | A checkable report shows | A template shows |
|---|---|---|
| Comparables | Three or more closed sales with date, distance and price per square foot | "Based on recent sales in your area" |
| Adjustments | Each difference priced, with the coefficient and where it comes from | One number, or none |
| Time step | A named price index at metro or ZIP level and the date of value | "Market trends" |
| Sources | A numbered reference list you can open | A row of logos, or nothing |
| Range | A low and a high that follow from the spread of the comparables | A point value with a confidence word |
| Inputs | The facts the model used, open for correction | The county record, locked |
A document that fits the right column cannot be traced.
County GIS is free: what you can get without paying anyone
Five public sources a US report should rest on, what each gives you, and what none of them does:
| Source | What it gives you at no charge | What it does not do |
|---|---|---|
| County assessor (example: Maricopa County) | Parcel search by address, property characteristics, assessed value, parcel maps, GIS layers and bulk downloads1 | Estimate a sale price |
| County recorder (example: Los Angeles County) | Deeds and other recorded documents filed since 1850, searchable and orderable by anyone2 | Put the index on the web; copies are requested one by one |
| FHFA House Price Index | Free quarterly and annual index files from the state level down to metros, counties, ZIP codes and census tracts, as CSV and other formats5 | Value a particular house |
| Census Bureau, American Community Survey | An ongoing survey since 2005 across more than 40 topics including housing and income, released annually at data.census.gov6 | Say anything about one parcel |
| FEMA flood maps, National Flood Insurance Program | The flood zone letter for your address from the Flood Map Service Center or the local floodplain administrator, each letter explained, with the advice to recheck yearly because hazards change7 | Translate flood risk into dollars |
Notice what the right column has in common: every public series describes an area, a tract or a zone, never one house. FHFA publishes its quarterly all-transactions index down to three-digit ZIP code, and annual developmental indexes down to five-digit ZIP code and census tract5; the step from that average to your address is the work a paid report owes you. Public data is the set of ingredients. A valuation is the cooking, and that is the only part worth paying for. The guide to official data sources for home values covers each series in depth; the complete guide to how much your house is worth explains what the result should mean.
What a paid report should add on top of the free records
Five steps separate a record from a valuation, and each one leaves a trace a reader can check. The model selects comparables from recorded sales by proximity, recency and similarity. It prices the differences between those sales and your house with coefficients estimated from local sales. It moves each older sale to the date of value with a price index. It derives a range from how far the adjusted comparables disagree. And it reads the maps, the rent level and the cost side for the same address. A report that performs these steps can print them; one that prints none of them either skipped them or would rather you did not look.
Example: the time step with real index figures. A house in Los Angeles is valued in October 2026, and the best comparable sold in May 2024 for $1,450,000. FHFA's all-transactions index for the Los Angeles-Long Beach-Glendale division stood at 533.55 in the second quarter of 2024 and at 557.38 in the second quarter of 2026, the latest quarter in the metro file5. The comparable moves to 1,450,000 × 557.38 / 533.55, about $1,515,000, before any adjustment for size, lot, condition or garage. Printed, this step can be redone with a pocket calculator; omitted, you cannot tell whether the 2024 sale was adjusted at all.
The adjustment step deserves the same treatment. A line that reads "garage: plus $28,000" is an assertion; a line that reads "garage: plus $28,000, coefficient from closed sales in this ZIP code over the last 12 months" is evidence, because it can be wrong in a way you can find. The guide to finding comparable sales shows how to assemble the comparables yourself, the fastest test of whether a vendor's three sales were chosen or merely nearest.
Why can't I export the report as a PDF?
Usually because the vendor prefers it that way. A web widget keeps you on the site, where the agent form and the next upsell live, and a screen cannot be forwarded to a lender, a sibling in an inheritance or a spouse's lawyer and argued with. The consequence is practical: no file means nothing to compare next year, nothing to show anyone, and nothing left when the site changes its plans.
Before you pay, check four things on the product page: the word PDF, the storage period in your account, whether a report can be shared by link, and the languages available. If the page is silent on all four, assume the answer is no. The free preview of your report at CheckValue shows the full layout with sample figures before you pay.
Generic report not worth paying for: five checks before you pay
- Open the sample report. No sample means the vendor is selling the purchase, not the report. Read it to the last page.
- Search the sample for the word "source". Count numbered references. Zero means the value is an assertion in a nice typeface.
- Count the comparables. Three closed sales, each with date, distance and price, is the floor Fannie Mae sets for appraisers4. Fewer than three, or sales without dates, is a template.
- Find the date of value and the index. A value without a date is a value for no particular day, and a time step without a named index is a guess.
- Look for your own inputs. If you cannot correct the county's square footage, state the condition and add photos, the report values the record, not the house.
One more sign: a page that demands your phone number before it shows anything is a lead form, and the report is the bait. The subscription variant, where sold prices that used to be free move behind a monthly charge, is covered in why sold prices are suddenly behind a paywall.
What to do if you already paid for a report with no sources
Start with the vendor. Write, do not call, and ask for the three things the document should have carried: the comparables with dates and distances, the adjustments with their coefficients, and the sources behind the index and the maps. Point out that regulators expect any evaluation a lender relies on to be documented or reproducible3. A serious vendor can send that within days; a reseller cannot.
If the product page promised a PDF, sources or comparables that never arrived, the charge is disputable. Regulation Z counts property or services not delivered as agreed as a billing error; your written notice must reach the card issuer within 60 days after the first statement that shows the charge; the issuer has to acknowledge it within 30 days and resolve it within two complete billing cycles, no later than 90 days; and you need not pay the disputed portion while the investigation runs8. The Comptroller of the Currency spells out what that letter has to do: identify you and your account number and state why you believe there is a billing error. The bank then has 30 days to acknowledge it, may not collect the disputed portion while it investigates, and may not report that amount as delinquent9.
A dispute is for a product that was not as described, not for a number you dislike. If the page promised nothing beyond "an estimate", the estimate was delivered as agreed and the dispute will fail. Save a copy of the product page at the time of purchase; it is the agreement the word "agreed" refers to. This is general information, not legal or tax advice.
What the CheckValue report prints, and what it does not claim
CheckValue sells an AI valuation report, so hold it to the yardstick above. Its answer to "how did they get that number" is the reference list at the end: numbered entries naming the FHFA series behind the time step, the Census tables behind the neighborhood figures, the FEMA layer behind the flood map and the county file behind the parcel facts. Every comparable sale carries its date and its distance from your address. Every adjustment line, from the pool to the energy class, states the coefficient applied and the source that coefficient comes from. You see and can overwrite the county's facts before the calculation, and may add photos. For a US address the report also includes the owner of record from public county records, together with the Fair Credit Reporting Act notice: not for credit, employment, insurance or tenant-screening decisions.
Delivery is the other half of this complaint: the report appears on screen and as a PDF in five languages, can be shared by link, and stays in your account on the web and in the app. If no report arrives despite payment, or the address was wrong, the report is credited back automatically or refunded within 30 days.
What it is not: a licensed appraisal, an inspection, or a figure with an accuracy percentage attached. Nobody visits the property. Where a lender, a probate court or a tax authority insists on a signed appraisal, this report is the briefing you take into that meeting, not the paper that satisfies the requirement. What a single report and the packs cost is on the pricing page.
When a client in Tenerife asked me where a figure came from, I could always open the folder: the sales, the dates, the adjustments, the index. A report that cannot open its folder has not finished its job, however handsome the cover page is.
Frequently asked questions
Why did my paid valuation report have no more information than the public records?
Because the vendor's product was the public record. Records resellers download the assessor roll and the recorder's index, add a search box and a value from a model, and charge for the package. The square footage, year built, lot size and assessed value you recognize came from the county; the value on top was never meant to be inspected, so no comparables, adjustments or sources were added to the document.
How did they get that number in my home value report?
Without comparables, adjustments and a named index in the document, nobody outside the vendor can say. A checkable estimate names the closed sales it rests on with date and distance, prices each difference with a coefficient, moves older sales to the date of value with a published price index and lists its sources. That is the content banking regulators expect of an evaluation a lender relies on, and it is a fair yardstick for anything you pay for.
Is a home value report worth paying for when county GIS is free?
Only if it adds analysis the county does not perform. Assessor portals, recorders, the FHFA House Price Index, the Census Bureau and FEMA's flood map service are public, and a good report cites exactly these. What you pay for is the work on top: selecting and adjusting comparables, the time adjustment, a range derived from the spread of the evidence, a rent estimate, the cost side and the maps read together for one address.
Why can't I export the report as a PDF?
Usually by design. A web widget keeps you on the site where the next upsell and the agent form live, a recalculated number cannot be contradicted by last month's copy, and a file can be shown to a lender or a spouse and argued with. Before you pay, look for the word PDF on the product page, the storage period in your account and a share link. A report you cannot save is one you cannot compare or show.
What sources should a property valuation report list?
The Interagency Appraisal and Evaluation Guidelines of 2010 expect an evaluation to indicate all sources used: external data such as market sales databases and public tax and land records, property-specific data such as prior and comparable sales, evidence of an inspection, photos and a description of the neighborhood. For a US address that means the county record, the closed sales, the FHFA index and the flood map, each named where it is used.
Can I get my money back for a generic report?
Ask the vendor in writing for the comparables, adjustments and sources first. If the product page promised a PDF, sources or comparables that never arrived, Regulation Z treats services not delivered as agreed as a billing error: send written notice to your card issuer within 60 days of the first statement showing the charge; the issuer must acknowledge within 30 days and resolve within two billing cycles, at most 90 days. A number you dislike is not a billing error.
Does CheckValue show its sources and give me a PDF?
Yes. Every CheckValue report ends with a numbered reference list of the official sources behind the price index, the comparable sales, the flood, energy and noise maps and each adjustment coefficient, and you confirm the county's facts before the calculation. You read it on screen and keep it as a PDF in German, English, French, Spanish or Italian, share it by link and find it again in your account. It is an AI valuation report, not a licensed appraisal.
This article is general information, not legal, tax or investment advice. Figures and rules carry the year they were published; check the cited source for the current version.
Sources
- 1officialMaricopa County Assessor's Office: parcel search, Parcel Viewer and GIS portalMaricopa County Assessor · 2026A large county assessor that lets anyone search parcels and addresses, open a parcel viewer with maps, use a GIS portal and download its data files at no charge, an example of what public property data covers.mcassessor.maricopa.gov ↗
- 2officialReal Estate Records: General InformationLos Angeles County Registrar-Recorder/County Clerk · 2026Any member of the public can search and request recorded real-estate documents filed since 1850; the office does not post its records or index online, citing Government Code section 6254.21 on the home addresses of elected and appointed officials, and provides copies on request online, in person, by fax or by mail.lavote.gov ↗
- 3guidanceInteragency Appraisal and Evaluation Guidelines (75 FR 77450, December 10, 2010)Office of the Comptroller of the Currency, Federal Reserve, FDIC, OTS and NCUA, via GovInfo · 2010An evaluation should describe the analysis performed and the supporting information used, indicate all sources of information (market sales databases, public tax and land records, prior and comparable sales, inspection evidence, photos, neighborhood description) and be documented in the credit file or reproducible; an AVM may be used only when the resulting evaluation meets these expectations.govinfo.gov ↗
- 4guidanceSelling Guide B4-1.3-08, Comparable SalesFannie Mae · 2025A minimum of three closed comparables must be reported in the sales comparison approach, each with its distance from the subject in miles and a directional indicator measured in a straight line; comparables from a competing neighborhood must be identified and their differences addressed (section updated June 4, 2025).selling-guide.fanniemae.com ↗
- 5statisticsFHFA House Price Index DatasetsFederal Housing Finance Agency · 2026Publicly available house price indexes for the US, states, the 100 largest metros and divisions, counties, 3-digit and 5-digit ZIP codes and census tracts, in CSV, JSON, XML and XLSX; in the quarterly all-transactions metro file the Los Angeles-Long Beach-Glendale division stands at 533.55 for 2024Q2 and 557.38 for 2026Q2, the latest quarter published.fhfa.gov ↗
- 6statisticsAmerican Community Survey (ACS)U.S. Census Bureau · 2026An ongoing survey conducted since 2005 covering more than 40 topics including housing, income and employment, with annual releases accessible at no charge through data.census.gov.census.gov ↗
- 7officialWhat is my flood zone?FEMA, National Flood Insurance Program (FloodSmart) · 2026Explains the flood zone letters (A, AE, AH, AO, AR and A99 as high risk, V and VE as coastal high risk, B and X as moderate, C and X as lower, D as undetermined), sends the public to FEMA's Flood Map Service Center or the local floodplain administrator for the zone of a given address, and warns that flood hazards change over time, so the zone should be rechecked every year.floodsmart.gov ↗
- 8law12 CFR 1026.13, Billing error resolution (Regulation Z)Legal Information Institute, Cornell Law School · 2026A billing error includes property or services not delivered to the consumer as agreed; the written notice must reach the creditor within 60 days after the first periodic statement reflecting the error; the creditor acknowledges within 30 days and resolves within two complete billing cycles but no later than 90 days; the consumer need not pay the disputed portion meanwhile.law.cornell.edu ↗
- 9guidanceCredit cards: disputes and unauthorized chargesOffice of the Comptroller of the Currency, HelpWithMyBank.gov · 2026The banking regulator tells consumers to notify the bank in writing with enough detail to identify the name and account number and to state why they believe there is a billing error; the bank must acknowledge the notice within 30 days, may not collect the disputed portion while it investigates, and may not report that amount as delinquent.helpwithmybank.gov ↗





