What RSK Biocensus does

RSK Biocensus is a UK-based ecological consultancy operating as the ecology division of RSK Group, providing ecological, environmental and sustainability services to private and public sector clients. The firm describes itself as the largest network of ecological consultants in the UK, combining a 230-person in-house expert team with a quality-assured network of more than 700 freelance ecologists, enabling UK-wide coverage and the ability to mobilise for Nationally Significant Infrastructure Projects. Service lines span ecological assessments, botanical and habitat surveys (Phase 1 and 2), protected species surveys and licensing (badgers, bats, dormice, otters, red squirrels), mitigation design, aquatic ecology, ecological clerk of works, arboriculture, ornithology, invertebrates, and technical expertise including public inquiry and expert witness work. Clients span government, healthcare, energy (including offshore wind operators Iberdrola and Ørsted, and onshore wind developers), utilities, rail, property, construction, highways, water and aviation, with named engagements on projects such as Heathrow West, the Haweswater Aqueduct Resilience Programme and Northern Powergrid's network support helpline.

The business model is project-based professional services, with revenue generated through custom quotations for survey, assessment and advisory work; pricing is not publicly disclosed. Distribution is direct consultancy sales supported by a freelance supplier portal, content marketing (Biocensus Insights), LinkedIn, and participation in industry conferences. The firm holds ISO 9001, ISO 14001 and ISO 45001 certifications, and in 2024 was awarded Responsible Body status by Defra, enabling compliance monitoring of habitat banks and entry into conservation covenants under the UK's Biodiversity Net Gain regime; this capability is commercialised through the RSK Wilding sub-brand established around 2022. The company originated as Cresswell Associates (1996), was acquired into RSK Group, and operates from a registered office in Helsby, Cheshire, with offices across the UK. Founding directors Jon Davies and Paola Reason retired in March 2026, with Dr. Tim Graham leading the RSK Wilding business. Active AI/ML capability is limited to PhD research collaborations with the University of Exeter on remote sensing and machine learning for BNG assessments, plus acoustic auto-ID tools for bat surveys.

Name

RSK Biocensus

Legal name

RSK Biocensus Limited

Website

https://rskbiocensus.com

Company type

Private

Operating status

Operating

Headcount range

101–250 employees

Short description

RSK Biocensus is the UK market-leading ecological consultancy within RSK Group, employing 230 in-house ecologists and a 700+ strong freelance network to deliver ecological surveys, biodiversity net gain assessments, protected species licensing and mitigation design for private and public sector infrastructure clients.

Ownership category

akta.pro rank

Headquarters

HQ city

Helsby

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Revenue model

1. Ecological Consultancy Services: Professional ecological consultancy services including ecological assessments, habitat surveys, protected species surveys, mitigation design, aquatic ecology, ornithology, and invertebrates. Services are provided to private and public sector clients on a project basis.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

RSK Biocensus is a UK-based ecological consultancy providing a complete range of professional ecological and environmental services to private and public sector clients. Core offerings include ecological assessments, Phase 1 and 2 habitat surveys, protected species surveys and licensing, mitigation design and management plans, aquatic ecology, ecological clerk of works, arboriculture, ornithology, invertebrate surveys, biodiversity net gain assessments, and Responsible Body compliance monitoring. Services are delivered by a 230-person in-house expert team and a network of 700+ freelance ecologists.

Product overview

RSK Biocensus is a market-leading ecological consultancy offering a comprehensive range of ecological services rather than a software product. Their core offering consists of multiple specialized service lines including ecological assessments, botanical and habitat surveys, protected species surveys and licensing, mitigation design, aquatic ecology, ecological clerk of works, technical expertise, project management, arboriculture, ornithology, and invertebrate services. Additionally, they offer Responsible Body services (as of 2024) and operate RSK Wilding as a sub-brand focused on Biodiversity Net Gain and habitat restoration. The company employs 230 in-house ecologists and maintains a network of over 700 freelance ecologists to deliver projects across the UK.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• 14.9% net gain in ecological value achieved for Leeds Teaching Hospitals NHS Trust pathology centre project
• +3 more outcomes

Named customers10 records

Segments4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability5 records

Feature6 records

Partnerships

One partnership is on record.

• RSK GroupcoreStrategic or Co-development PartnerRSK Biocensus Limited is part of the RSK Group of companies, a global leader in environmental and engineering solutions. RSK Group provides corporate support including training, HR, and operational infrastructure. RSK Biocensus operates as the ecological consultancy division within the group.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• WSP Environment & Sustainability: Global professional services firm with a substantial UK environment and ecology practice providing ecological impact assessments, habitat surveys, and protected species work to the same enterprise and infrastructure clients as RSK Biocensus, but as part of a much broader multi-disciplinary portfolio.
• Arcadis UK Environment: Global design and consultancy firm with a UK ecology team (previously led by Dr. Tim Graham, now at RSK Biocensus) delivering ecological surveys, EIA, and biodiversity services to developers, infrastructure, and energy clients directly comparable to RSK Biocensus's core offering.
• AECOM Environment: Global infrastructure consulting firm with a substantial UK environmental and ecology practice providing ecological assessments, habitat surveys, and BNG services to similar public and private sector clients, including major infrastructure and renewable energy developers.
• Jacobs Environment & Sustainability: Major global environmental consultancy with UK ecological services spanning environmental impact assessment, protected species surveys, and biodiversity net gain work for infrastructure, water, and energy clients—directly competing for the same NSIP and developer mandates.
• Mott MacDonald Environment: Global engineering and development consultancy with an established UK environmental and ecology practice delivering ecological surveys, EIA, and biodiversity services to water, rail, highways, and energy clients—highly comparable end markets and service profile to RSK Biocensus.
• AtkinsRéalis (SNC-Lavalin) Environment: Global professional services firm with a UK environmental practice providing ecological impact assessment, habitat surveys, and biodiversity services to transport, energy, and development clients competing for many of the same mandates as RSK Biocensus.

Direct peers

• Thomson Environmental Consultants: UK-based ecological consultancy providing ecological surveys, habitat assessments, protected species work, and arboriculture to infrastructure and development clients—a close specialist peer to RSK Biocensus in scale, geography, and service mix, though smaller in headcount.
• Wardell Armstrong: UK-based multidisciplinary environmental consultancy with a substantial ecology practice delivering ecological surveys, EIA, and protected species work to developers, minerals, and infrastructure clients—a directly comparable specialist competitor in the UK market.
• Ecus Ltd: UK ecological and environmental consultancy providing ecological assessments, habitat surveys, arboriculture, and BNG services to developers, infrastructure, and public sector clients—a closely comparable independent specialist peer.

Emerging players

• NatureMetrics: UK-based nature data and monitoring company using eDNA and remote sensing for biodiversity assessment—overlaps with RSK Biocensus on BNG monitoring and ecological measurement, but is tech-led rather than consultancy-led, making it an emerging rather than direct competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/biocensus
• Instagraminstagram.com/rskbiocensus
• Xx.com/RSKBiocensus

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about RSK Biocensus