Constraint

Water and soil as the deciding factor

Water and soil as the deciding factor means the ground and the water system decide what may be built where, rather than the other way round. Provinces set it out in their environmental by-laws and water authorities in their permits. It changes the design, the groundworks and therefore who supplies them.

What is this constraint?

The Netherlands builds on wet ground. In more and more places the question is no longer whether something fits, but whether the ground and the water can take it. That principle is water and soil as the deciding factor, and it is moving from policy into rules.

In practice it means extra requirements in a plan. Hard surfacing has to be offset with water storage. Building in a groundwater-sensitive area calls for investigation first. In peat areas subsidence weighs into the water level, and that decides what can stand on that ground. One province wrote that investigation duty into a draft of its environmental by-laws in 2025.

For a supplier this is not a legal question but a design question. Water storage, permeable paving, bank structures and foundations on soft ground are products, and they are hours. They enter the plan at the moment the permit is applied for, not when the contractor is already on site.

There is no national source tracking, project by project, whether ground and water are decisive. Modou has no dedicated monitor for this. What it does have is the water permits from water authorities, the environmental by-laws from provinces, the water level decisions and the water paragraph in zoning plans. Those are dated documents, and Modou reads them every working day.

Which documents it shows up in

Water permits in the water authority gazette: Why that is a reason to callThese state what a developer has to compensate and how. That is groundworks, water storage and structures, with a permit holder attached.
Provincial environmental by-laws and amendments to them: Why that is a reason to callProvinces set out here when ground and water are decisive. A new investigation duty changes what has to be in every plan.
Water level decisions and area processes of water authorities: Why that is a reason to callA new water level changes what that ground can carry. Building on peat or soft soil then calls for different foundations and different materials.
Zoning plans and project decisions with a water paragraph: Why that is a reason to callThe water paragraph names the requirements before a contractor is anywhere in sight.

Who sells into this

Construction suppliers

Water storage, infiltration and permeable paving
Foundations and ground reinforcement for soft soil
Bank structures, sheet piling and revetments
Groundworks and civil engineering materials

Energy companies

Underground heat and cold storage bound by soil and groundwater rules
Cables and pipes in groundwater-sensitive areas

Example from a public document

Construction supplier

What happened

A water authority grants a water permit for a large-scale area development. The developer has to widen watercourses to offset the extra hard surfacing.

Source:: Water authority gazette
Date:: August 2025

Why this matters to you

Offsetting hard surfacing changes the design: water storage, permeable paving, bank structures and groundworks. Those are products and those are hours.

Why now

The permit has been granted, so the work is now being prepared. The choices about method and materials are made in this phase.

Who to call

Civil water management adviser at the developer

Phone number, where publicly findable
LinkedIn, where publicly findable

This example comes from a public document.

Frequently asked questions

Is this not mainly work for civil engineering contractors?

They build it. But the requirement lands in the plan, and that is where the material and the structure are decided. Whoever is at the table at that moment supplies it.

How early do I see this?

A water permit is applied for before building starts and published as soon as it is granted. An amendment to environmental by-laws is put out as a draft first. Both come before the tender.

Want to see the requirements before the contractor is chosen?

Plan a six-week pilot. Every working day you get the water permits, by-laws and plans from your area, with source, date and who to call.

Plan a pilot Run the opportunity check