Property Evidence Methodology & Limits

The organizing principle

A dossier, not a blended score.

Property records, legal status, physical condition, hazard exposure, insurance, and affordability answer different questions. We keep them separate because a useful comparable-sale ledger cannot cancel an unresolved lien, unpermitted addition, structural defect, or insurance problem.

Question 01

Which records match this property?

Address, unit, parcel, listing, tax, assessment, and deed records with source dates.

Question 02

What is still unresolved?

Title, permit, inspection, hazard, HOA, and source gaps remain visible.

Question 03

What will ownership cost?

Cash to close, debt service, tax, insurance, HOA, repairs, and reserves.

Question 04

What must happen next?

Open questions, responsible professionals, contingencies, and decision deadlines.

Five checks before a paid dossier can be useful.

A report can advance only as far as its weakest decision-critical gate. An unknown is not treated as a pass, and a low-risk item cannot offset a high-consequence unresolved one.

1

Identity

Address, unit, geocode, parcel/APN, and property type agree. The legal description remains a professional due-diligence check.

2

Listing

A fresh provider record shows an active listing and the buyer confirms the current ask.

3

Closed sales

At least four subject-relevant records are qualified, source-linked, and bracket finished area.

4

History and costs

Available tax, deed, listing history, and ownership-cost assumptions retain their limits.

5

Diligence

Title, inspection, hazard, insurance, HOA, appraisal, and financing checks have owners and deadlines.

Evidence coverage is staged, not implied.

Public data can support an early screen. It cannot, by itself, make a property ready for an offer or closing.

Stage	Evidence expected	How it may be used	What it does not mean
1 · Screen	Resolved subject, preliminary comparables, public hazard and market context, visible source gaps.	Shortlist a property, identify questions, and decide whether deeper diligence is worth the cost.	Not offer-ready. Public-record silence is not clearance.
2 · Evidence dossier	Parcel-confirmed subject, fresh active listing, core property facts, qualified and bracketed closed-sale records, available history, and source freshness.	Audit the available records, compare the sales yourself, test cost assumptions, and plan professional diligence.	Not transaction clearance or permission to remove title, inspection, financing, appraisal, or insurance protections.
3 · Closing-ready	Lender valuation where required, independent inspections, title commitment/attorney review, HOA documents, final loan terms, and bindable insurance.	Compare final terms with the original decision and surface material changes before closing.	Not a guarantee of future condition, market value, or resale result.

How the closed-sale ledger is built.

The process starts with the exact subject property, then screens recorded sales for identity, timing, proximity, property type, core facts, transaction quality, and source traceability. The public output stops at evidence; it does not reconcile an automated value.

1

Define the subject as of a date

Confirm property type, finished area, lot, room count, year built, unit, project/HOA, and location. Conflicting facts remain visible and can block a safe match.

2

Select competitive closed sales

The paid preflight requires at least four qualified closed sales. Pending sales and active listings do not replace closed evidence, and distressed, family, duplicate, or mismatched transfers are excluded or clearly flagged.

3

Verify and explain

Retain recorded price, date, property facts, distance, provider record ID, source link or provenance reference, and retrieval date. Explain unusual sales and exclusions.

4

Stop before the price conclusion

Publish the qualified recorded-sale ledger and its gaps. Do not expose internal model rankings, adjustments, adjusted indications, fair-price labels, or offer ceilings.

Comparable-sale references

GSE appraisal guidance is useful education on why subject relevance, closed-sale verification, and comparable differences matter. Twellie cites it as a research reference, not as a claim that the dossier is an appraisal. See Fannie Mae: Comparable Sales and Freddie Mac: Sales Comparison Approach.

Buyers can apply the same evidence discipline without treating it as a DIY appraisal. Use the home-comps field guide and printable ledger.

Why the public dossier stops before a value conclusion.

A list of comparable sales is evidence, not automatically a defensible opinion of value. Condition, concessions, legal use, micro-location, financing, and facts missing from online records can materially change the interpretation.

Different appraisals, broker opinions, and AVMs can produce different results because they use different comparable sales, dates, data, and purposes. The CFPB explains why valuations differ.

Current customer-output boundary

Publish

Exact-property facts, current ask, qualified recorded sales, source dates, and evidence gaps.

Plan

Ownership-cost assumptions and due-diligence tasks with missing quotes kept open.

Suppress

Automated values, ranges, model rankings, adjustments, and fair-price labels.

Never infer

An absent record is not proof that an issue, transfer, lien, permit, or hazard does not exist.

Current public product: evidence-only. Internal valuation research does not unlock checkout and is not sent to customer HTML, JSON, email, dashboard, or preview output. A future valuation product would require a prospective, time-separated benchmark and a separately reviewed release.

From source records to a due-diligence plan.

The dossier helps a buyer verify the subject, review closed-sale evidence, stress ownership assumptions, and assign unresolved work. It leaves the offer decision to the buyer and appropriate licensed professionals.

01 · Verify

Confirm the exact property

Match the address, unit, parcel/APN, listing status, current ask, and core facts against the contract and authoritative records.

02 · Compare

Audit the closed-sale ledger

Open each available source, review dates and property differences, and ask an appraiser or local professional about facts the online record cannot establish.

03 · Escalate

Protect the transaction deadlines

Assign title, inspection, insurance, HOA, appraisal, financing, and legal questions to the right professional before the relevant contingency expires.

Match

Subject + source records

Review

Closed sales + cost assumptions

Escalate

Professional checks + deadlines

The CFPB advises buyers to budget for the complete monthly payment and for maintenance, repairs, utilities, taxes, supplementary insurance, and HOA fees. See CFPB: Figure out how much you want to spend.

The due-diligence modules.

These modules surface evidence and the next professional check. They do not convert public data into legal, engineering, environmental, insurance, or lending clearance.

Title, parcel, and planning

Track deed and ownership history, liens, taxes, easements, covenants, survey/boundary questions, zoning, permitted use, open permits, code issues, and nearby proposals. A title commitment or local attorney/title professional must resolve legal status.

CFPB title guidance

Condition and specialist inspections

An independent inspection is separate from an appraisal. Property-specific triggers may call for structural, roof, electrical, plumbing/sewer, HVAC, pest, septic, well, radon, lead, asbestos, mold, pool, chimney, or disaster-damage specialists.

CFPB inspections · EPA radon · EPA wells

Flood, wildfire, climate, and geology

Show map edition, scale, effective date, hazard meaning, limits, insurance implication, and next action. FEMA zones do not mean zero risk outside high-risk areas; national wildfire and geologic maps are screening layers, not parcel clearance.

FEMA/NFIP flood zones · USDA wildfire · USGS landslides · Federal climate mapping

Condo and HOA health

Review declarations, rules, budgets, financials, reserves and reserve study, delinquency, minutes, special assessments, critical repairs, litigation, master insurance and deductibles, and use/rental restrictions.

Fannie Mae condo risk factors

Insurance and finance

Use actual buyer scenarios and written quotes when available. Track coverage, exclusions, deductibles, flood/wind/earthquake needs, loan terms, cash to close, taxes, insurance, and appraisal-gap exposure. An online estimate is not a bindable quote or loan approval.

CFPB insurance guidance

Market-area context

Closed-sale volume, inventory, concessions, listings, permits, and broader price trends provide context but do not replace subject comparables. Survey statistics carry vintages and uncertainty; neighborhood facts must be presented consistently and without protected-class valuation inputs.

FHFA HPI · Census permits · ACS uncertainty

Every material finding carries a source status.

A result should store the source, retrieval date, effective date, geography, raw value, transformation, and verification state. If sources disagree, the conflict remains visible until resolved.

Status	Meaning	Decision treatment
Verified	Current direct record, licensed feed, uploaded document, or professional report tied to the subject.	May support a decision within the stated scope and date.
Supported	Corroborated by more than one source, but not yet a final legal, physical, insurance, or lender determination.	Use with the named contingency or follow-up.
Stale	The source is older than the decision requires or predates a known event, listing, permit, map, or market change.	Refresh before relying on it.
Unavailable	The source was not accessible, did not cover the location, or returned no usable record.	Unknown—never interpreted as no issue.
Conflict	Material sources disagree about identity, attributes, status, price, date, or risk.	Blocks readiness until reconciled or explicitly accepted.

Future valuation research requires prospective validation.

This is an internal research standard, not a description of the current customer product. Model performance must be demonstrated on unseen future outcomes, segmented by place and property type, and disclosed without implying testing that has not occurred. Until that standard is met and a separate release is approved, Twellie publishes no automated value or accuracy percentage.

Validation standard

✓Use time-separated holdouts to reduce leakage from future sales.
✓Measure error by county/market, property type, price band, and data density.
✓Report median error, tail error, interval coverage, and overvaluation frequency.
✓Version models, watch drift, audit samples, and escalate low-confidence cases.

Control standard

✓Protect source and subject data from manipulation.
✓Document conflicts of interest and separate paid placement from evidence.
✓Test for prohibited bias and exclude protected traits from value decisions.
✓Keep human review available for unique, thin-market, or conflicting cases.

These internal research controls follow principles in the federal Quality Control Standards for Automated Valuation Models. The rule applies to specified mortgage and secondary-market uses; Twellie cites it as a governance reference, not as a claim that the evidence dossier is an AVM or regulated mortgage valuation.

Important limitations

What this report cannot establish.

Not a licensed appraisal. It does not replace an appraisal ordered by a lender or one prepared for the buyer by a state-licensed or certified appraiser. State appraisal and AVM rules vary; the Appraisal Subcommittee maintains state regulator information.

Not title, legal, or planning advice. It is not a title examination, survey, legal opinion, permit clearance, zoning determination, contract review, or guarantee of ownership rights.

Not an inspection. Photos, records, and models cannot reveal hidden defects. Independent inspectors and property-specific specialists remain necessary.

Not a quote or approval. Cost scenarios are not tax, investment, lending, or insurance advice; they do not guarantee financing, insurability, premium, coverage, or closing costs.

No future-value guarantee. The evidence is dated and can change with the property, market, maps, law, taxes, insurance, or newly discovered facts. It cannot guarantee a sale price or investment return.

No universal jurisdictional completeness. Seller disclosures, recorder access, planning systems, taxes, hazards, HOA rules, and professional licensing differ by state and locality. Coverage must be shown per address.

Housing information must be presented consistently and without prohibited discrimination. See HUD Fair Housing rights and obligations.

Product claims must match available evidence; a disclaimer does not repair an unsupported accuracy or completeness claim. See the FTC advertising substantiation policy.

A property report should show what the evidence supports — and what still needs to be checked.