Start real-estate listing checks
Choose the permitted market sample
Use a licensed listing feed, broker export or an agreement with the source first. Define region, property type, offer type and fields before collecting a small sample.
Capture the whole offer
Verify the requested route and save listing ID, property reference, raw price, currency, rental period, fees when shown, status and capture time. Keep listing and property identifiers separate.
Review changes before alerts
Match the next observation to the same property and offer. Flag withdrawals, repricing and duplicates for review, then publish a comparison with the source and time attached.
One property can produce several offers
A fictional market sample keeps a sale and a rental offer separate while merging duplicate copies of the same rental.
Count records with an identified property, offer type, currency, amount or explicit missing state, period and observation time. Track duplicates and stale listings separately; an advertised price is not a completed transaction.
What to measure: comparable listing share
Count records with an identified property, offer type, currency, amount or explicit missing state, period and observation time. Track duplicates and stale listings separately; an advertised price is not a completed transaction.
Start with a feed that fits the intended use
Use a broker export, licensed property feed or source agreement when it covers your market. Public listing access and permission to republish a dataset are separate questions. Define the destination of the data before deciding whether to collect full text, photographs or only factual offer fields.
Schema.org’s RealEstateListing describes a listing page that can contain one or more real estate offers. That distinction is useful for your model: keep the page, property and offer as separate records so one property’s rental and sale offers are not merged accidentally.
Normalize the comparison, preserve the source
Record sale, lease and short-stay offers separately. Preserve the raw amount and currency, then attach the rental period and any displayed recurring or one-time fees. A monthly asking rent cannot be compared directly with a weekly figure or a sale price.
Retain listing ID, broker or agency reference, property reference and capture time. Keep area units and the original location text alongside normalized values. If two records appear to describe the same address, review the match; one building can contain multiple units and one listing can move between brokers.
Use location as one controlled input
Start with Premium Residential for a city or other supported selector where we have exits. Use Residential Flex for country-level collection. Keep search filters, map bounds, language, cookies and account state fixed when comparing regional results.
Illustrative sizing: 1,000 listing observations averaging 300,000 response bytes produce 0.3 GB of response payload before request traffic and overhead. Avoid downloading large photographs when the permitted comparison needs only offer fields. Measure billed usage and complete-record share before expanding the schedule.
Keep the feed current and limited
Follow the source contract, applicable robots instructions and request limits. Stop on access controls or refusals. Exclude private tenant, owner and applicant information, and do not use this workflow to submit inquiries, bookings, applications or financial decisions.
Provide a correction and removal path, and show when each listing was last checked. A withdrawn page, a failed request and an unknown status are distinct outcomes. Treat advertised figures as asking offers; the dataset does not establish a valuation, completed sale or availability guarantee.
When the result looks wrong
The observed country differs
Confirm the generated country selector and inspect a fresh connection with the IP diagnostic.
Next step: Keep the mismatch in the record and correct the route before the sample.
A response is incomplete
Compare the content type, required fields and source template with the extraction contract.
Next step: Quarantine the response and review the parser before adding it to the accepted dataset.
The source returns a refusal or rate limit
Inspect the response class and the source-wide request budget.
Next step: Pause the queue, honor Retry-After and resolve the access or budget issue before continuing.
Sources and further reading
Published by Databay Research Team. The worked example is an illustrative exercise. Documentation and existing test evidence support the technical guidance; their scope and dates remain attached to the relevant sections.