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What can you build in Alphen aan den Rijn?

Alphen aan den Rijn (South Holland) has 114,966 inhabitants and 50,799 homes. There are 168 national monuments. 33% of the buildings were built before 1970.

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At a glance

Alphen aan den Rijn in figures
ProvinceSouth Holland
Inhabitants114,966
Homes50,799, of which 341 newly built in the last year
Type of home64% single-family house (of which 8% detached), 36% flat
Owner-occupied homes63%
Average WOZ value (municipal valuation)€373,000
National monuments168
Buildings from before 197020,256 of 62,282 (33%)

Is my house in Alphen aan den Rijn a monument?

Alphen aan den Rijn has 168 national monuments in the monuments register. That puts Alphen aan den Rijn in place 15 of the 50 municipalities in South Holland. What that means.

Does Alphen aan den Rijn have many old buildings at risk of foundation problems?

33% of the 62,282 buildings in Alphen aan den Rijn were built before 1970 (20,256 buildings). Across the province of South Holland it is 40%; Alphen aan den Rijn is in place 33 of 50. Assessing the risk.

Is there a Natura 2000 area in Alphen aan den Rijn?

Yes, 2 areas: De Wilck and Nieuwkoopse Plassen & De Haeck.

What is the average WOZ value in Alphen aan den Rijn?

The average WOZ value (the municipal property valuation) of a home in Alphen aan den Rijn was €373,000 (CBS). In the province of South Holland: €373,000 (weighted by the number of homes). 63% of the homes are owner-occupied (province: 52%).

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Sources: CBS (Statistics Netherlands), Kerncijfers wijken en buurten 2024 (85984NED), CC BY 4.0; Cultural Heritage Agency (RCE), via PDOK; Natura 2000, Netherlands Enterprise Agency (RVO), via PDOK; Indicative areas needing attention for foundation problems (Indicatieve aandachtsgebieden funderingsproblematiek), KCAF/RVO, via PDOK. Retrieved on 21 October 2026.

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