Waarderingskamer

What Waarderingskamer does

Waarderingskamer is the independent Dutch government supervisory body (toezichthouder) for the execution of the Wet Waardering onroerende zaken (Wet WOZ / Property Valuation Act) by municipalities. Established under Dutch law, the organization monitors and assesses all 345+ Dutch municipalities and their inter-municipal WOZ execution organizations, provides guidance and tools, and advises the state secretary of Fiscaliteit en Belastingdienst on WOZ-related regulation and policy. Its core beneficiaries are Dutch municipalities (mandatory subjects of supervision), with secondary information services directed at citizens and business property owners who need to understand, check, or contest WOZ valuations.

The organization's product portfolio spans a public information ecosystem and a secure municipal platform. Public-facing products include waarderingskamer.nl, the WOZ-wijzer information service, the WOZ-waardeloket public portal for residential property valuations, and the Beoordelingen Gemeenten transparency portal showing municipality ratings. For municipalities, the Mijn Waarderingskamer portal provides access to assessments, benchmark data, and progress inventories. Underlying technical infrastructure includes the Landelijke Voorziening WOZ (LV WOZ) national database covering approximately 9.4 million WOZ objects, the Taxatiemodel computer valuation model, and the WOZ Taxatieverslag Woningen API for standardized data exchange with external government systems such as MijnOverheid. Data synchronization with the BAG (Addresses and Buildings registry) and BRK (Land Registry) ensures consistency across government data sources.

Waarderingskamer is a government organization funded through the Ministry of Finance and does not generate commercial revenue. Its approximately 25 employees operate from the headquarters in The Hague. Pricing is not applicable as services are provided as part of statutory government functions. Revenue streams are non-existent in the commercial sense; the organization reports publicly on WOZ-related market data (€11 billion in related tax revenue, €225 million in total annual WOZ execution costs nationwide) but does not collect fees. The go-to-market is regulatory oversight rather than commercial sales: the organization provides guidance, tools, and assessment protocols to municipalities, and information services to citizens and businesses through its website and contact center.

Name

Waarderingskamer

Legal name

Waarderingskamer

Website

https://waarderingskamer.nl

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

11–50 employees

Short description

Waarderingskamer is the Dutch government's independent supervisory body overseeing municipal execution of the Wet WOZ property valuation law, serving all 345+ Dutch municipalities with guidance, benchmarking, and the national WOZ database, and providing information services to citizens and businesses.

Ownership category

akta.pro rank

Product category

Government Property Valuation Oversight

NAICS

Public Administration (92)

SIC

Non-Operating Establishments (9995)

akta.pro primary industry

Homeowners Association (HOA) Management (BPAJAHAB)

akta.pro secondary industries

Hybrid Cloud Management, Monitoring & FinOps (HDABAMAD), Master-Planned Community & POA Management (BPAJAHAD)

Keywords

• Property valuation oversight
• WOZ supervision
• Municipal tax assessment
• Government regulatory body
• Real estate appraisal standards

Headquarters

HQ city

The Hague

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Infrastructure, Others

Revenue model

1. Government funding: Waarderingskamer is a government organization funded through the Ministry of Finance. As a supervisory body, it does not generate commercial revenue. The organization oversees WOZ execution by municipalities at no direct cost to them.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

Waarderingskamer is the Dutch national supervisory body that monitors and assesses municipal execution of the Wet Waardering onroerende zaken (Wet WOZ / Property Valuation Act). It provides statutory oversight over all 345+ Dutch municipalities, issues quality frameworks and benchmarks, publishes the annual 'Staat van de WOZ' report, and operates digital platforms (public website, Mijn Waarderingskamer portal, WOZ-waardeloket, WOZ Taxatieverslag API) that serve citizens, businesses, and municipal WOZ staff.

Product overview

Waarderingskamer operates as the national supervisor of the Wet WOZ (Wet Waardering Onroerende Zaken), the Dutch property valuation system. The organization's product portfolio consists of a public-facing information ecosystem and a secure municipal portal. The public platform (waarderingskamer.nl) and WOZ-wijzer provide citizens and businesses with guidance on WOZ valuations, while the WOZ-waardeloket offers public access to property valuation data. The Mijn Waarderingskamer portal serves municipal employees with research access, progress inventories, and benchmark data. Supporting products include the WOZ-benchmark analytical tool, the Beoordelingen Gemeenten transparency portal, the Waarderingsinstructie quality framework, and the Landelijke Voorziening WOZ (LV WOZ) national database. A key technical product is the WOZ Taxatieverslag Woningen API enabling external government systems to retrieve and display standardized property valuation reports.

Differentiator

Problem solved

Functional benefit

Products and services

• waarderingskamer.nl (Public Website) The official public website providing information about the WOZ (Wet Waardering Onroerende Zaken) property valuation system. Serves citizens and businesses with guidance on understanding, checking, and contesting WOZ valuations, as well as municipality performance reviews.
• Mijn Waarderingskamer (Municipal Portal) A secure online portal for municipal employees involved in WOZ execution. Enables contact data management, access to Waarderingskamer research results, completion of progress inventories, and submission and viewing of benchmark data. All municipalities and collaborative organizations executing the Wet WOZ have access to this portal.
• WOZ-wijzer An information platform for citizens and businesses explaining the WOZ valuation system. Covers topics including understanding WOZ values, checking valuations, filing objections, and specific situations such as WOZ for businesses.
• WOZ-benchmark An annual benchmarking tool allowing all municipalities to learn from each other and improve the WOZ process. Includes cost benchmarking and performance comparisons across municipalities, with data displayed in a dashboard accessible via MijnWaarderingskamer.
• De Staat van de WOZ An annual report presenting key developments around the Wet WOZ, including analysis of WOZ execution across municipalities, market developments, and recommendations for improvement.
• WOZ-waardeloket A public portal (hosted at wozwaardeloket.nl) where citizens can look up WOZ values for residential properties free of charge. Allows comparison of WOZ values across properties.
• WOZ-taxatieverslag Property valuation reports provided to homeowners that explain the WOZ value, including property characteristics, comparable sales data, and valuation methodology. From 2027 (valuation date January 1, 2026), municipalities must use the modernized standardized model.
• Beoordelingen Gemeenten A public portal showing assessments and ratings of municipalities on their WOZ execution quality. Citizens can search by municipality to see how their local government performs in WOZ administration.
• Waarderingsinstructie A quality framework document specifying the requirements that proper execution of the Wet WOZ must meet. Serves as the basis for Waarderingskamer's supervision and internal control and quality assurance of all WOZ activities.
• Landelijke Voorziening WOZ (LV WOZ) The national database containing WOZ data from all municipalities. Central repository for property valuation records used by government agencies, municipalities, and the public.
• WOZ Taxatieverslag Woningen API A public API specification allowing external applications (municipal digital tax portals, MijnOverheid) to retrieve data for populating the WOZ assessment report for residential properties. Published on Swagger Hub for developer access.

Quantifiable outcome

• National average WOZ value increase of 10.6% between 2024 and 2025 value reference dates

Named customers1 record

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

Feature4 records

Scale indicators6 records

Recent moves4 records

Expansion highlights4 records

Regional players

• Skatteverket: Swedish Tax Agency, which performs property valuation functions for Swedish municipal taxation. Comparable as another European national tax authority with a property valuation mandate similar to Wet WOZ.
• BC Assessment: Canadian Crown corporation responsible for property assessment across British Columbia. Functions as a regional government property valuation agency comparable in purpose to Waarderingskamer.
• Valuation Office Agency (VOA): UK government executive agency that provides property valuations and advice for tax and benefits purposes. Direct functional analogue to Waarderingskamers property valuation oversight mandate, but operating in the UK.
• HM Land Registry: UK government department responsible for registering property ownership and land interests. Comparable government registry function to Waarderingskamers national WOZ data infrastructure, operating in the UK.
• Bundesministerium der Finanzen: German Federal Ministry of Finance — comparable as the German counterpart national authority that owns and oversees property valuation frameworks (Bewertungsgesetz) feeding German property taxation.
• Lantmäteriet: Swedish Land Survey Authority — comparable European national government agency operating property data, cadastral, and mapping infrastructure analogous to the LV WOZ national system.
• Skattestyrelsen: Danish Tax Administration, which carries property valuation responsibilities used by Danish municipal taxation. Comparable European national authority engaged in property valuation oversight.

Direct peers

• Kadaster: Dutch Land Registry and Mapping Agency that maintains the BAG and BRK national property data registries directly integrated with Waarderingskamers LV WOZ. Closely comparable as another Dutch government entity operating national property data infrastructure.

Broad incumbents

• Belastingdienst: Dutch Tax and Customs Administration — the larger national incumbent within the same Dutch government property/tax ecosystem. Belastingdienst consumes WOZ values as foundation for various national tax assessments, making it an adjacent supervisory-administration counterpart.

Others

• International Association of Assessing Officers (IAAO): Global professional association supporting property assessors and valuation officials. Comparable ecosystem participant that sets professional standards relevant to Waarderingskamers competency requirements for municipal WOZ staff.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/waarderingskamer

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Waarderingskamer