The most important procedures for a large and complex project such as the HSL were the Key National Spatial Planning Decision (PKB) and the Route Act procedure. In the PKB procedure (1991 - 1997), the feasibility of the high-speed line was examined, and ways to achieve this. After the Cabinet and the Lower House decided to construct the HSL, the Route Act procedure could start in 1997. In this procedure, the preferred route of the PKB was worked out and at various moments stakeholders were able to make inquiries or file objections and/or appeals. 

After the Council of State judged these appeals, the Route Decision including Supplements became irreversible in the course of 2000. In this year, contracting firms were contracted and a start was made with the preparations for the construction.

The construction of the HSL required several thousands of permits: for instance tree-felling permits, draining permits and building permits. The contractors and the HSL Project Organization work closely together when filing applications with provinces, municipalities and district water boards.

From an early stage, the project has involved parties in the vicinity of the line, such as municipalities, provinces, district water boards, neighbouring residents and organised interest groups. They have all been asked to help think about harmonising the line with the surroundings, environmental recovery and compensation, and reduction of noise pollution. Not only prior to construction, but also during the project execution the surrounding residents have played and are still playing an important role. In many municipalities along the HSL track, so-called feedback groups are actively involved. Besides residents, these discussion groups are also made up of the project organisation, contractors, the relevant municipality and sometimes interest groups. The main objectives, which these groups are trying to achieve, is keeping hindrance as a result of construction to a minimum and the mutual exchange of information. In this way, all parties involved worked together in an open atmosphere to find the best solution.