Immowelt Scraper & Authorized Property Data Access for Germany

Immowelt Property Data Starts With the Access Path

Immowelt is operated by AVIV Germany GmbH. (AVIV Germany GmbH (Immowelt Impressum)) Its current platform covers property buying, selling, renting, letting, valuation, and related real-estate services.

For a property-data team, the useful first question is not simply: “Can we scrape Immowelt?” It is: “Can the official Immowelt API support this requirement, and if not, what other authorized source path is available?”

A useful project should define:

• rent or sale
• German city, district, postcode, or target geography
• apartment, house, land, or other property type
• search-result versus detailed-exposé requirements
• required fields
• whether energy/building attributes are needed
• whether the customer has an active Immowelt advertiser/provider relationship
• current API eligibility or credentials
• one-time versus recurring requirement
• intended business use
• storage requirements
• redistribution/public-display requirements
• destination

NenoData’s current Real Estate Data Scraping service NenoData’s current Real Estate Data Scraping service already follows this source-first model: sources, markets, fields, cadence, intended use, and destination are scoped before implementation, and source support is confirmed rather than assumed.

Immowelt Has an Official API

Immowelt currently publishes first-party technical documentation for its WebService API. (Immowelt WebService API documentation)

The documentation describes services for:

The API uses:

Current official documentation includes:

This makes Immowelt materially different from portals where no first-party API can be verified.

The presence of an official API, however, is only the start of the access decision.

Who Can Use the Official Immowelt API?

Current API terms state that the API is an additional service available to a provider with an active contract to present real estate through Immowelt. (Immowelt API terms)

Access credentials must be requested from AVIV Germany through the provider’s Immowelt account.

The standard documented use case is: provider’s own Immowelt property offers → provider’s own website

That means API access must not be described as universally available to any company wanting marketplace data.

Before designing a project around the official API, confirm:

• whether the customer has an active qualifying Immowelt relationship
• whether credentials already exist or can legitimately be requested
• which property offers the customer may retrieve
• the intended downstream website/application
• attribution requirements
• storage requirements
• whether the use remains within the standard own-provider scenario
• whether additional AVIV Germany consent is necessary

What the Official Immowelt API Does Not Automatically Permit

Keep these boundaries explicit.

Current API terms expressly say that retrieval of property data from several providers by a third party for a separate marketplace requires AVIV Germany’s express consent.

They also expressly state that the API may not be used for another purpose such as pure data export.

This distinction must remain central throughout the page.

Official Immowelt API vs Third-Party “Immowelt API”

Search results and developer marketplaces may contain third-party products marketed as:

These may help establish:

They do not establish official Immowelt rights.

Do not imply that a third-party extraction API is equivalent to holding an official Immowelt API key.

Potential Immowelt Property Data Fields

The exact schema depends on approved API/source, access rights, property type, customer relationship, and final project scope.

This is an illustrative schema. It is not a guarantee that every official API customer, exposé, property type, or other approved source exposes every field.

Sale and Rental Records Need Different Pricing Logic

Sale and rental records can share property attributes while still representing different economic concepts.

Do not automatically add German rental concepts simply because they are common in Germany. In particular, use fields such as Kaltmiete, Warmmiete, and Nebenkosten only when they are confirmed in the approved Immowelt API/source or representative records. Preserve source-visible semantics first.

NenoData’s Rental Market Data Scraping service supports approved-source rental workflows where cadence and source availability are confirmed during scoping.

EUR and €/m² Should Be Stored as Separate Fields

Potential fields:

Do not replace:

• total price with €/m²
• €/m² with total price
• asking sale price with rent

If NenoData derives €/m², do so only when the correct price field is known, the correct area basis is known, and an agreed calculation rule exists. Derived values should remain distinguishable from source-provided values.

NenoData’s Data Cleaning & Standardization service supports agreed field mapping, transformation rules, and validation for EUR and price-per-m² fields.

Living Area and Plot Area Are Different Measurements

German property data must keep Wohnfläche (living area) and Grundstückfläche (plot area) as separate concepts.

Potential normalized fields:

Do not:

• add the two values together
• replace one with the other
• calculate price-per-m² against the wrong area basis

This distinction matters for:

Where the source meaning is unclear: preserve the original value, leave normalized semantics unresolved, and use an exception path rather than inference.

Rooms, Floor, Property Type, and Year Built Should Preserve Source Context

Potential property fields may include:

• Map exact fields from the approved source.
• Do not invent universal Immowelt fields.
• Missing fields should remain null, unavailable, or exception-coded where necessary.
• Do not infer missing values from unrelated attributes.

German Location Data Should Be Structured Hierarchically

Immowelt’s official API includes geographic services and location identifiers.

Potential normalized fields:

Use only the hierarchy actually supported by the approved source. Do not manufacture exact coordinates, district mappings, or address precision where the source does not support them.

Energy and Building Fields May Be Useful

German property workflows can require energy/building information.

Potential fields may include:

Keep these potential, source-dependent, and confirmed during scoping. Do not claim universal Immowelt energy-field coverage.

Third-party Immowelt products may inform likely buyer expectations, but production field claims must be supported by the official API, representative approved records, or another authorized source.

Asking Price, Valuation, and Transaction Price Are Different

Immowelt also provides an online property-valuation product. A German property model may therefore contain several different price/value concepts:

These must not be collapsed into one generic price.

Potential fields:

Immowelt valuation terms Current Immowelt valuation terms give users limited rights in valuation data and restrict onward/commercial use without consent.

Do not imply that NenoData can: reproduce proprietary Immowelt valuations, redistribute them, reverse engineer the valuation method, sell them as NenoData data without verified rights.

Immowelt’s General Terms Restrict Platform-Content Reuse

Immowelt General Terms restrict users, beyond what is necessary for private use, from:

• reproducing platform/other-customer content
• downloading it
• editing it
• publicly making it available
• distributing it
• modifying/adapting it
• translating it
• creating derivative works
• reverse engineering/decompiling/disassembling protected content

unless expressly legally permitted.

Immowelt’s current imprint likewise states that content and images are copyright protected and may only be reproduced, distributed, or otherwise used within ordinary use of the service.

Current 2026 Immowelt legal/DSA wording also expressly reserves against text and data mining and data collection/extraction across AVIV Germany content, data, and webpages.

Therefore do not reduce the source-rights question to: “Is the website technically scrapeable?” The project needs a permitted access and downstream-use model.

API Access Does Not Automatically Permit Storage or Redistribution

Even a legitimate Immowelt API key does not create unrestricted downstream rights.

Immowelt API terms state that:

• providers may retrieve their own property offers
• multi-provider retrieval for a separate marketplace needs express consent
• the API may not be used merely for pure data export
• the retrieved data cannot simply be republished to other property portals under the standard arrangement
• attribution to Immowelt applies to the documented integration

For every API-based NenoData engagement, confirm:

Technical API availability does not replace licensing analysis.

Authorized Immowelt Data Paths NenoData Can Evaluate

NenoData’s Multi-Source Data Aggregation service supports agreed external and customer-authorized sources rather than arbitrary source use.

NenoData’s Data Sources page explicitly treats source feasibility and permitted collection method as scoping questions rather than guarantees.

Agency Identity and Personal Contact Data Need Separate Review

Agency/provider identity can be analytically relevant. Personal contact fields are a separate data class.

Before handling:

review:

Do not make unrestricted contact harvesting a headline capability.

One-Time Immowelt Dataset or Recurring Observations

Where the approved API/source arrangement permits repeated access and retention, the workflow may be one-time or recurring.

The approved access arrangement must permit repeated retrieval, storage, and retention.

Do not claim:

• an existing NenoData Immowelt archive
• daily Immowelt refresh by default
• hourly refresh
• real-time refresh
• an Immowelt-specific fixed SLA

Delivery Must Fit the Immowelt Access Arrangement

NenoData’s Custom Data Pipelines service can support:

• CSV
• Excel
• JSON
• API-ready payloads
• database loads
• warehouse loads
• webhooks
• scheduled workflows

For an Immowelt-related project confirm:

1. 1.source/access path
2. 2.records the customer may retrieve
3. 3.field scope
4. 4.transformation rights
5. 5.storage
6. 6.retention
7. 7.attribution
8. 8.internal versus external use
9. 9.destination
10. 10.redistribution/public-display rights
11. 11.cadence

“API-ready” means NenoData can structure records for a downstream programmatic system. It does not mean NenoData possesses Immowelt credentials, unrestricted official API rights, or bulk-export permission.

How an Authorized Immowelt Data Workflow Would Work

1. 1

   Define the requirement

   Specify sale or rent, German geography, property types, search versus exposé data, required fields, energy/building fields, one-time versus recurring use, and downstream destination.

2. 2

   Check official API eligibility

   Confirm active Immowelt provider relationship, valid credentials or eligibility to request them, records accessible to that customer, intended use, and whether additional AVIV Germany consent is required.

3. 3

   Select the permitted source path

   Potential inputs: official Immowelt API, separately authorized Immowelt arrangement, customer-owned property inventory, participating broker/developer feed, licensed German property source, or customer-provided file.

4. 4

   Define the schema

   Potential categories: listing/exposé identity, sale/rent, EUR price, €/m², property type, rooms, living area, plot area, floor, year built, location, energy, provider identity, and observation metadata.

5. 5

   Normalize and validate

   Apply agreed rules for EUR, area units, living versus plot area, rent versus sale, property types, location identifiers, null handling, source IDs, duplicate candidates, source attribution, and exception handling.

6. 6

   Review downstream-use constraints

   Confirm attribution, storage, retention, public/internal use, redistribution, and permitted destination.

7. 7

   Deliver within approved rights

   Prepare the permitted output for customer website/application, files, API-ready structures, database, warehouse, webhook, or another approved destination.

Potential Business Requirements

These are customer requirements, not proof that the standard Immowelt API permits every use.

Why NenoData Is Relevant to an Immowelt Requirement

NenoData Is Not Affiliated With Immowelt or AVIV Germany

NenoData does not claim affiliation with Immowelt, partnership with AVIV Germany GmbH, official API credentials, active Immowelt provider status, multi-provider consent, marketplace-wide API rights, unrestricted export rights, an existing Immowelt dataset, or authorized-scraper status. Only state such a relationship if separately documented.

Frequently Asked Questions