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Environmental certification and prior consultation for investment projects in Peru: SEIA categories, SENACE and Ley Nº 29785

Last verified: 2026-10-28 · Status: Stable

No project covered by Peru's environmental impact assessment system (SEIA) can start, and no authority can license it, without a prior environmental certification. Projects are classified as Category I (environmental impact statement), II (semi detailed EIA) or III (detailed EIA), and detailed EIAs for national and multiregional projects are approved by SENACE. When a State measure, such as a concession or permit, may directly affect the collective rights of indigenous peoples, the State must run a prior consultation, capped at 120 calendar days for the core stages, whose agreements bind both sides.

USD figures use S/ 3.452 per US dollar, the banking system selling rate published by the Superintendencia de Banca, Seguros y AFP for 27 October 2026 and shown in the Banco Central de Reserva del Perú statistics series PD04640PD. Amounts in UIT use the 2026 tax unit of S/ 5,500 (Decreto Supremo Nº 301-2025-EF, as cited in SUNAT Resolución de Superintendencia Nº 000016-2026). Amounts that the law sets in US dollars are quoted as written. Conversions are for orientation only.

Key facts

Environmental certification categories under the SEIA	Category I DIA; Category II EIA-sd; Category III EIA-d textLey 27446 art. 4.1, as of 2026-10-28 · in force
Authority approving detailed EIAs for national and multiregional projects	SENACE textLey 29968 art. 1.3, as of 2026-10-28 · in force
Maximum duration of the publicity, information, internal evaluation and dialogue stages of prior consultation	120 calendar daysDS 001-2012-MC art. 24, as of 2026-10-28 · in force
Minimum stages of a prior consultation process	7 stagesLey 29785 art. 8, as of 2026-10-28 · in force

The rule

1. Projects and service and commerce activities covered by the SEIA cannot begin, and no national, sectoral, regional or local authority may approve, authorize, permit, grant or enable them, without the prior environmental certification contained in a resolution of the competent authority.Ley Nº 27446, Ley del Sistema Nacional de Evaluación del Impacto Ambiental (El Peruano, 23 April 2001), art. 3 as amended by Decreto Legislativo Nº 1078 (28 June 2008), Art. 3, 2008-06-28 official text · verified 2026-10-28 · changed: Decreto Legislativo Nº 1078 (28 June 2008) extended mandatory certification to service and commerce activities and removed the reference to the regulation's entry into force.

2. Each action on the regulation's inclusion list must be classified as Category I, Environmental Impact Statement (DIA), for projects without significant negative impacts; Category II, semi detailed EIA (EIA-sd), for moderate impacts that can be eliminated or minimized with easily applicable measures; or Category III, detailed EIA (EIA-d), for projects whose characteristics, size or location may cause significant negative impacts requiring in depth analysis. Policies, plans and programs with significant implications require a Strategic Environmental Assessment reviewed by MINAM.Ley Nº 27446 as amended by Decreto Legislativo Nº 1078, Art. 4.1 to 4.3, 2008-06-28 official text · verified 2026-10-28

3. The applicant files a classification proposal with its request; for Category I the authority issues the certification directly, and for the other categories it approves the terms of reference for the study. After evaluation the authority issues a public technical legal report and a reasoned resolution; the resolution approving the environmental management instrument is the environmental certification that authorizes execution of the project.Ley Nº 27446 as amended by Decreto Legislativo Nº 1078, Art. 7.1 b) and c), art. 8.2 a) and b), art. 12.1 and 12.2, 2008-06-28 official text · verified 2026-10-28

4. SENACE, a specialized technical agency attached to the Ministry of the Environment, reviews and approves detailed EIAs (EIA-d) for public, private or mixed investment projects of national and multiregional scope that may cause significant environmental impacts, and runs the single window for environmental certification (Ventanilla Única). Functions are transferred sector by sector by supreme decree.Ley Nº 29968, Ley de creación del SENACE (promulgated 19 December 2012), Art. 1.1 to 1.3, art. 3 a) and e), art. 13 and complementary provisions, 2012-12-19 official text · verified 2026-10-28

5. Indigenous or original peoples have the right to be consulted in advance on legislative or administrative measures that directly affect their collective rights, physical existence, cultural identity, quality of life or development, and on national and regional development plans, programs and projects with that effect. Consultation is carried out only by the State, and its purpose is to reach agreement or consent through intercultural dialogue.Ley Nº 29785, Ley del derecho a la consulta previa a los pueblos indígenas u originarios, reconocido en el Convenio 169 de la OIT (promulgated 6 September 2011), Art. 2 and art. 3, 2011-09-06 official text · verified 2026-10-28

6. The promoting entity must follow at least seven stages: identify the measure, identify the peoples to be consulted, publicize the measure, inform about it, allow internal evaluation by the peoples' organizations, hold the dialogue, and decide. The final decision belongs to the competent State entity and must be reasoned; agreements reached are binding on both parties and enforceable administratively and in court, and if there is no agreement the State must adopt all measures needed to guarantee collective rights.Ley Nº 29785, Art. 8 and art. 15, 2011-09-06 official text · verified 2026-10-28

7. The publicity, information, internal evaluation and dialogue stages of a consultation may last at most 120 calendar days, counted from delivery of the proposed measure to the signing of the consultation record; the promoting entity then publishes a consultation report.Reglamento de la Ley Nº 29785, Decreto Supremo Nº 001-2012-MC (dated 2 April 2012), Art. 24 and art. 25, 2012-04-02 official text · verified 2026-10-28

Category	Instrument	Expected impact	Who approves
I	Declaración de Impacto Ambiental (DIA)	No significant negative impacts	Sector, regional or local competent authority; certification issued on classification
II	EIA semidetallado (EIA-sd)	Moderate impacts mitigable with easily applicable measures	Competent sector, regional or local authority
III	EIA detallado (EIA-d)	Significant negative impacts needing in depth analysis	SENACE for national and multiregional projects in transferred sectors (Ley 29968 art. 1.3)

SEIA categories (Ley 27446 art. 4 as amended by DL 1078).

Worked example

A foreign developer plans a 200 MW solar plant spanning two regions. Its classification proposal concludes it may cause significant impacts, so it prepares a detailed EIA (Category III). Where the sector's EIA-d function has been transferred to SENACE, SENACE first approves the terms of reference and then the study (Ley 27446 art. 8.2 b; Ley 29968 art. 1.3).
Until SENACE issues the approving resolution, no authority may grant the permits that let construction start (Ley 27446 art. 3), so the EIA path drives the project timeline and financing conditions precedent.
If the site overlaps lands of an indigenous community and the measure (for example a concession or authorization) may directly affect its collective rights, the competent ministry runs a prior consultation whose core stages may last up to 120 calendar days (DS 001-2012-MC art. 24); any agreement reached binds the State and the community (Ley 29785 art. 15).

Step by step

Check whether the activity is on the SEIA inclusion list and which authority is competent (SENACE, the sector ministry or a regional or local government).
File the classification proposal with the evaluation request; obtain the DIA directly for Category I or approval of the terms of reference for Categories II and III.
Prepare the study and present and execute a citizen participation plan; for semi detailed and detailed EIAs the authority runs a formal public consultation, and for a detailed EIA a public hearing must be held at least 5 days before that consultation period ends (Ley 27446 art. 14 b) to d)).
Obtain the certification resolution before applying for construction or operating licenses.
Map indigenous peoples in the area of influence using the official database of indigenous peoples (Ley 29785 art. 20) and ask the promoting entity whether the measure requires prior consultation.
Plan for the consultation timeline (up to 120 calendar days for the core stages) and for the obligations that agreements create.

Common traps

Starting works or obtaining permits without certification breaches Ley 27446 art. 3; authorities are barred from licensing uncertified projects, and the permit itself is exposed.
Prior consultation is a State duty (Ley 29785 art. 2). A private agreement with a community does not replace it.
Agreements reached in consultation are binding and enforceable administratively and in court (art. 15), so commitments offered during dialogue become obligations.
One final provision of the consultation regulation was annulled with retroactive effect by a popular action ruling published 14 January 2022 (Exp. 29126-2018), so use an updated text of DS 001-2012-MC.
The SEIA regulation and sector regulations set the review terms for each category (Ley 27446 art. 11.3). The official text of the general regulation (DS 019-2009-MINAM) on gob.pe is largely a scanned image, so confirm terms with the competent authority.

Sources

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