Structural engineer in Alphen aan den Rijn

The local housing profile

For Alphen aan den Rijn, Statistics Netherlands (CBS) records 115,773 residents and 51,069 homes on 1 January 2025. Single-family homes make up 64% of the stock; dwellings in multi-unit buildings account for 36%. This distinction helps when preparing an alteration: work on an entire house raises different questions from work within a shared building. Describe which walls, floors or roofs you wish to alter.

Within Zuid-Holland, 3.0% of residents live in the municipality of Alphen aan den Rijn. The settlement classification dated 1 January 2026 lists 8 settlements here. These include Aarlanderveen, Alphen aan den Rijn, Benthuizen, Boskoop. The population and housing figures on this page cover the entire municipality, including these settlements.

CBS — population (1 January 2025) · CBS — housing stock and dwelling types (2025) · CBS — officially registered settlements (1 January 2026)

Alphen aan den Rijn compared with the province of Zuid-Holland

With 115,773 residents, Alphen aan den Rijn ranks 7 among the 50 municipalities in Zuid-Holland, from largest to smallest population. The municipality accounts for 2.9% of the province’s housing stock and 4.7% of its land area. This shows the relationship between the number of homes and the area within this municipality.

Calculated population density in Alphen aan den Rijn is 919 residents per km² of land, compared with 1,432 for the province of Zuid-Holland. This is an area comparison, not a measure of access to your building site. Describe access, available working space and adjoining buildings in your enquiry.

Reference date: 1 January 2025. Provincial totals are summed from municipal data; densities and shares are calculated from these totals. Rounded areas can produce small differences from directly published densities.

Soil and ground types

Within the boundaries of Alphen aan den Rijn, map unit ohVb covers the largest measured area of soil polygons in this analysis: 2,653 hectares, or 21.4% of the mapped area.

Original Dutch source name:

Koopveengronden op bosveen (of eutroof broekveen)

The shares are calculated within the soil polygons on the map, not across all land or all building addresses. For compound map codes, the name of the first unit is shown. The map describes shallow soil; built-up areas are not fully mapped. It does not establish bearing capacity or determine whether piles, pad footings or strip foundations should be used.

Explore subsurface data in BROloket · How the soil map can be used · Method and sources for these area profiles

Read about foundation investigations · Pad footing, pile or strip foundation?

How much renovation takes place?

The CBS tables used here do not provide a complete local renovation count for Alphen aan den Rijn. We therefore do not estimate this from population, new homes or a national percentage. These sources also do not establish which type of renovation is most common.

See the available building figures and what they mean

Towns and villages within this municipality

The names below are officially registered BAG settlements from the 2026 CBS classification. One settlement may contain several neighbourhoods. The municipal figures above are not separate population counts for these villages.

• Aarlanderveen · Prepare your calculation enquiry
• Alphen aan den Rijn · Prepare your calculation enquiry
• Benthuizen · Prepare your calculation enquiry
• Boskoop · Prepare your calculation enquiry
• Hazerswoude-Dorp · Prepare your calculation enquiry
• Hazerswoude-Rijndijk · Prepare your calculation enquiry
• Koudekerk aan den Rijn · Prepare your calculation enquiry
• Zwammerdam · Prepare your calculation enquiry

Structural calculations for your project

Choose the alteration that matches your project. The linked service page describes the information needed, possible deliverables and points to consider. Site surveys, timing and costs are agreed for each commission.