The cost of ISO 27001 consulting can vary widely depending on several factors:

Scope of the Project: The size and complexity of your organization and the scope of the ISMS (Information Security Management System) implementation will affect the cost. Larger organizations or those with complex IT infrastructures may require more extensive consulting.

Consulting Firm: Different ISO 27001 consulting firms have varying pricing structures based on their reputation, expertise, and location. Larger firms often charge higher fees due to their established reputation and breadth of services, while smaller firms might offer more competitive rates.

Level of Assistance Needed: Some organizations may require comprehensive support throughout the entire ISO 27001 certification process, including gap analysis, policy development, risk assessment, implementation guidance, training, and audit preparation. Others may only need assistance with specific aspects.

Geographic Location: Consulting rates can also vary based on the geographical location of the consulting firm and the client. Rates tend to be higher in major cities or regions with higher living costs.

Duration of Engagement: The length of time required for the consulting engagement will impact the overall cost. Some firms may charge by the hour, day, or project, depending on the arrangement.

To get a precise estimate, it's advisable to contact several ISO consulting firms and provide them with details about your organization's size, current state of information security practices, desired scope of ISO 27001 implementation, and any specific requirements you may have. They can then provide you with a tailored proposal and cost estimate based on your needs.