EIA Chilches south coast 2026: what it means for construction companies and coastal engineering

Key data

The project to stabilise the southern coastal stretch of Chilches (Castellón) has received environmental clearance. The Dirección General de Calidad y Evaluación Ambiental issued the Environmental Impact Assessment (EIA) on 10 March 2026, published in the BOE on 2 April 2026 under reference BOE-A-2026-7537.

This means that the main administrative obstacle to carrying out the coastal protection works has been overcome. From this point, the project can move forward to the public tendering phase, opening a concrete window of opportunity for companies in the construction and coastal civil engineering sector.

What does this regulation establish?

The EIA is the administrative document that grants environmental authorisation for a project and sets the conditions under which it may be executed. In this case, it establishes the binding environmental framework for the stabilisation works on the southern coastline of Chilches, a municipality in the province of Castellón affected by coastal erosion processes.

The key elements regulated by this EIA are:

• Preventive measures: Actions that must be taken before and during the works to avoid damage to the marine and terrestrial ecosystem of the coastline.
• Corrective measures: Actions to minimise the unavoidable impacts generated by the coastal stabilisation works.
• Compensatory measures: Obligations to offset residual impacts that cannot be fully prevented or corrected.
• Binding conditions: All of the above is mandatory for the project promoter and the awarded contractor.

The objective of the project is to halt coastal erosion and protect the territory of the municipality of Chilches through interventions on the coastline. The EIA does not define the specific type of works (breakwater, beach nourishment, jetty, etc.), but rather establishes the environmental framework within which any intervention must be carried out.

Economic and operational impact

For companies in the sector, the impact of this resolution is primarily a business opportunity that is now activated. The EIA was the administrative bottleneck preventing progress: with its approval, the project enters the tendering phase.

The specific operational and economic implications are:

• Tendering opening: The competent public administrations may initiate the public procurement process to award the works.
• Environmental compliance costs: Bidding companies must incorporate into their offers the cost of implementing all the preventive, corrective and compensatory measures required by the EIA. Failing to do so correctly may result in disqualification of the bid or penalties during execution.
• Risk of suspension: Non-compliance with the binding environmental conditions during execution may lead to a precautionary suspension of the works, with the consequent economic impact on the awarded contractor.
• Resource planning: Environmental measures may affect execution timelines, construction methods and required resources, particularly with regard to the protection of the marine ecosystem.

Who is affected?

• Construction companies specialising in coastal civil works that may bid for the stabilisation project tender.
• Maritime civil engineering firms and consultancies involved in project design, site supervision or technical assistance.
• Environmental consultancies required to prepare environmental monitoring plans and follow-up reports as demanded by the EIA.
• Public administrations responsible for supervising compliance with the environmental conditions (Ministerio de Transición Ecológica, Demarcación de Costas, Generalitat Valenciana).
• Residents and property owners in the municipality of Chilches (Castellón) who will be affected by the works and will benefit from the resulting coastal protection.

Practical example

A construction company specialising in maritime works that wishes to bid for the award of the south coast stabilisation project in Chilches must act in two distinct phases:

Tendering phase: When preparing its technical and economic offer, it must explicitly and quantifiably include the cost of all the preventive, corrective and compensatory measures required by the EIA. If these costs are not correctly reflected in the offer, the company may win the tender but face unforeseen cost overruns during execution.

Execution phase: Once the works have been awarded, the company is obliged to comply with all the binding environmental conditions of the EIA. This involves, for example, respecting closed seasons for marine fauna, correctly managing waste generated on the coastline and implementing the agreed compensatory measures. Non-compliance with any of these conditions may result in a precautionary suspension of works by the competent environmental authority.

What should companies do now?

1. Identify the tender notice: Monitor the Plataforma de Contratación del Sector Público and the contracting authority profile of the promoting body to detect the publication of the tender announcement for the Chilches coastal stabilisation project.
2. Analyse the EIA in detail: Download and review the full resolution (BOE-A-2026-7537) to understand exactly which preventive, corrective and compensatory measures are required before preparing any bid.
3. Quantify the environmental cost: Incorporate into the tender budget all costs arising from compliance with the binding environmental conditions. Underestimating them is a direct financial risk for the awarded contractor.
4. Prepare the environmental technical team: Ensure that the necessary technical resources are in place to carry out the environmental monitoring plan required by the EIA throughout the works, including qualified personnel and monitoring equipment.
5. Seek specialist advice: If the company has no prior experience with EIA-governed works on the Mediterranean coastline, it is advisable to obtain specialist technical and environmental advice before submitting a bid.

Official source

Disclaimer: This article is for informational purposes only and does not constitute legal advice. For specific decisions, please consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-7537