Environmental Consulting Companies in London: 275 Active Firms (2026)
Environmental consulting companies in London advise organisations on permits, impact, sustainability risk and compliance across urban development and infrastructure.
Buying centres tend to sit with planning, estates, infrastructure, legal and sustainability teams rather than a neat, dedicated budget owner. Engagements are usually project-led, moving from permit applications and environmental impact support into monitoring, compliance evidence and board-level risk advice. London firms in this category sell to property developers, public-sector bodies, utilities, industrial operators and infrastructure programmes where environmental liabilities affect project timing, financing or operational permission. The commercial shape is mixed: lean specialist consultancies can handle high-value advisory work, while multidisciplinary practices support longer programmes across permitting, analytics, site assessment and management advice.
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London has 275 trading environmental consulting companies, a compact professional-services cohort rather than a high-volume software-style market. Reported employment totals 919 people, which points to many small advisory teams alongside a narrower set of larger consultancies. Revenue dispersion is visible: 14 companies report turnover above £5M, while 68 were incorporated since 2022. That age profile suggests continued formation around specialist regulatory, planning and sustainability work, but the upper end remains relatively sparse by revenue, with larger engagements likely concentrated among firms that can cover permitting, technical studies and programme management together.
The regulatory pull comes from client activity rather than the advisory act itself. Work commonly sits around Environment Agency and Defra guidance on permits and licences for activity that could pollute air, water or land, raise flood risk, affect land drainage, or abstract or impound water. Permit routes span installations, waste operations, water discharge, groundwater activity, flood-risk work, radioactive substances and water abstraction; some installation and solvent-emission permissions sit with local councils. That structure makes domain expertise and evidence handling central to procurement, particularly where construction or infrastructure programmes need consents before works can proceed.
Demand appears tied less to discretionary sustainability projects than to planning risk, permit compliance and asset-level exposure in construction, property and infrastructure. That gives the sector a defensive element, although small consultancies may remain exposed to project delays and procurement cycles. Larger multidisciplinary providers tend to benefit when clients want permitting, modelling, monitoring and assurance under the same contract, while specialist boutiques can still win where local knowledge or a narrow technical discipline matters. Consolidation looks plausible, but not automatic: many buyers still value independent expert advice where regulatory evidence, not breadth of service line, determines the outcome.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
Active director count is the full Companies House board, so it can be higher than the number of names listed — we leave out nominee and formation-agent directors, who aren’t worth contacting. It’s blank for the small number of companies whose officers we haven’t fetched yet.
You’re charged per business, not per row. Where a business trades through several registered companies you get every one, and the Group Primary column marks one row per business — filter to those and the count matches your invoice. Rows sharing a website are not automatically one business: franchises and multi-site operators each count separately, and where names don’t prove a relationship we count them apart rather than guess.
275
Active firms
2026
14
Above £5M turnover
Larger London operators
68
Incorporated since 2022
Newer London firms
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Key facts
About 5% of the trading cohort reports turnover above £5M (14 of 275 firms) — the rest sits below that revenue band.
24% of the cohort was incorporated since 2022 (68 firms), so a sizeable share is in its first few filing cycles.
Environmental consulting is a professional-services category rather than a single licensed activity, with work often tied to permits, planning, water, waste and land-use controls.
GOV.UK guidance says organisations may need an environmental permit or licence for activities that could pollute air, water or land, increase flood risk, affect land drainage, or abstract or impound water.
The Environment Agency is the main regulator for many permits, while some installation and solvent-emission permits are handled by local councils.
The largest 27 UK environmental and sustainability consulting providers grew combined annual revenues by 123% between 2019 and 2024.
The largest 38 global providers increased their market share from 52% in 2019 to 65% in 2024, pointing to concentration at the upper end.
Top London Environmental Consulting companies
Provides engineering and professional consulting services including environmental, geotechnical and infrastructure advisory, planning and design. Supports projects in transport, property, energy,…
Serves public and private-sector organisations in property, transport, infrastructure, environment, mining, energy, water and industrial markets, including government, utilities, developers and asset…
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Provides engineering, architecture and consultancy services for infrastructure, buildings, energy, environment and transport projects. Advises governments and companies on planning, design,…
Serves governments, public agencies and companies worldwide, including clients in infrastructure, energy, buildings, environment, transport and urban development.
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Computed from 5 filingsProvides environmental consultancy and geo‑environmental engineering services, including contaminated land risk assessments, site investigations, flood risk and drainage strategies, air and noise…
Serves public and private sector organisations involved in UK property and infrastructure development, including developers, landowners, planners and businesses with environmental compliance needs.
Financial Health
HealthyHealthy · Hiring · 10% CAGR over 4y
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Computed from 4 filingsProvides consulting, engineering and construction management services for energy, utilities, transportation and infrastructure projects, including environmental assessment, regulatory compliance,…
Serves public and private sector organisations in power and utilities, energy, transport, water, construction, commercial and industrial markets, plus government and financial/professional services…
Financial Health
StrongStrong · Hiring · 20% CAGR over 3y
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Provides engineering, design and consulting services for the built environment, including infrastructure, buildings, transport, energy and sustainability projects. Offers multidisciplinary expertise…
Serves public- and private-sector clients developing infrastructure, buildings, energy systems and transport networks, including city authorities, developers, utilities, rail and maritime…
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Provides engineering, design and consulting services for the built environment, including infrastructure, buildings, transport systems and energy projects. Offers multidisciplinary expertise in…
Serves public-sector bodies, private developers, and infrastructure owners/operators across the built environment, including transport, energy, buildings, rail, maritime, sports and urban development…
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Provides engineering, architecture, construction, environmental and consulting services. Plans, designs, permits and builds infrastructure and facilities including energy, transportation, aviation,…
Serves B2B and public-sector clients in power, aviation, transportation, healthcare, commercial, retail, institutional, government and military sectors needing large-scale facilities and…
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N/AN/A
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- Jacobs09188414
- Jacobs U.K.02594504
- Jacobs00454398
Financial sub-scores
Computed from 2 filingsProvides engineering, design, consulting and program management services for infrastructure, water, environmental and industrial projects. Offers feasibility studies, planning, design‑build delivery,…
Serves public and private sector organisations managing large-scale infrastructure, water, climate resilience, digital transformation, mission-critical, scientific and advanced manufacturing…
Financial Health
WeakWeak · Hiring · 89% CAGR over 1y
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- Pell Frischmann04011008
- Pell Frischmann03799877
- Pell Frischmann01775893
- Pell FrischmannOC348318
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Computed from 5 filingsProvides engineering and technical consultancy for infrastructure and built environment projects, including highways, bridges, rail and buildings. Offers design, project management, surveying, asset…
Serves B2B and public sector clients across the built and natural environment, including infrastructure owners, developers, contractors and government bodies in aviation, highways, rail, water,…
Financial Health
StableStable
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Provides planning and environmental permitting consultancy for development projects including minerals extraction, waste management facilities, recycling and energy-from-waste plants, renewable…
Serves B2B developers, landowners and operators in minerals, waste and recycling, energy-from-waste, renewables, agriculture, leisure, tourism, and residential or commercial development.
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Provides sustainability and environmental consulting services to businesses, including climate and net‑zero strategy, ESG reporting, environmental, health and safety management, regulatory…
Serves large organizations and investors across chemicals, financial services, manufacturing, mining, oil and gas, power, renewables, TMT and pharmaceuticals, targeting sustainability, ESG, risk, EHS…
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Computed from 5 filingsProvides water and environmental engineering consultancy services, including flood risk assessments, drainage design, hydraulic modelling, groundwater and hydrogeology studies, contaminated land risk…
Serves public and private sector clients across the UK and Ireland, including local authorities, developers, infrastructure and construction teams, and operators of wind farm, quarry, cemetery and…
Financial Health
HealthyHealthy · 0% CAGR over 4y
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Provides engineering, architecture, environmental and advisory services for infrastructure, water, energy, transportation and built environment projects, including planning, design, digital…
Serves public- and private-sector infrastructure clients, including utilities, transport authorities, energy and resources companies, developers, and government bodies managing water, energy,…
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Computed from 4 filingsProvides engineering, environmental and consulting services for industrial and institutional projects. Offers strategic advisory, energy and power systems engineering, mining and mineral processing…
Serves industrial and institutional B2B clients, including operators and project owners in mining and metals, power and renewables, energy, chemicals, and other process-intensive sectors.
Financial Health
StrongStrong · Growing · 0% CAGR over 3y
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Computed from 4 filingsProvides engineering, consulting and operational services for energy and waste infrastructure projects. Supports waste‑to‑energy, biomass, anaerobic digestion and battery storage facilities with…
Sells to municipal and commercial clients, financial institutions, and energy developers in the waste, renewables, and energy sectors, including organisations behind waste-to-energy, biomass,…
Financial Health
StableStable · 0% CAGR over 3y
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- Amey02564794
Provides engineering, consultancy, and asset management services for transport infrastructure and public sector facilities. Services include design, data analytics, project management, operations and…
Serves UK public-sector bodies and infrastructure operators, including roads and rail authorities, defence, justice, education, health, aviation and owners of complex facilities.
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- Black & Veatch08584398
- Black & Veatch (U.K.)02376420
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Computed from 3 filingsProvides engineering, procurement, consulting and construction services for infrastructure projects, including power generation and delivery, water and wastewater systems, energy transition, fuels,…
Serves B2B and public-sector infrastructure clients, including power utilities, energy companies, water and wastewater operators, industrial businesses, mines and infrastructure owners worldwide.
Financial Health
WeakWeak · -23% CAGR over 2y
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Computed from 5 filingsProvides multidisciplinary consulting services including engineering, architecture, urban planning, environmental studies, economics, and project and construction management for infrastructure and…
Serves public- and private-sector infrastructure clients, including airport and rail operators, utilities, city authorities, commercial developers, telecoms, oil and gas, and heavy industry…
Financial Health
StrongStrong · Hiring · 21% CAGR over 5y
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Provides engineering, planning and consulting services for infrastructure and development projects, including aviation facilities, urban development, power, rail and transit, roads and highways,…
Serves public-sector and private infrastructure clients in aviation, urban development, environment, power, rail and transit, roads, tunnels, and water/wastewater.
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- ABPmer01956748
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Computed from 5 filingsProvides marine environmental consultancy and survey services, including marine planning, consents and licensing support, habitat restoration, metocean analysis, GIS and data services, and…
Serves B2B and public sector clients operating in the marine environment, including developers, ports and harbours, utilities, renewables, cables and pipelines, fisheries and aquaculture, marine…
Financial Health
StableStable · 0% CAGR over 4y
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Computed from 5 filingsProvides geotechnical and environmental engineering consultancy, including site and soil investigations, land contamination assessments, flood risk and environmental impact assessments, basement…
Serves UK property developers, construction and infrastructure project teams, landowners and public sector bodies involved in land acquisition, planning, redevelopment and major building projects.
Financial Health
HealthyHealthy · Growing, Hiring · 17% CAGR over 4y
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Computed from 5 filingsProvides consulting and engineering services for energy and infrastructure projects, including energy transition strategy, utility planning, transmission and distribution engineering, sustainability…
Serves B2B and public-sector clients in energy, utilities, infrastructure, buildings and sustainability markets, including organisations involved in power systems and transmission and distribution.
Financial Health
StrongStrong
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- Waterman02619531
- Waterman03269195
- Waterman02193976
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Computed from 3 filingsProvides engineering and environmental consultancy services for the built environment and infrastructure. Offers planning and design, sustainability, building services, structural engineering,…
Serves public and private-sector organisations in built environment and infrastructure, including commercial, residential, healthcare, education, defence, transport, energy, data centres, industrial…
Financial Health
HealthyHealthy · -23% CAGR over 2y
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Provides waste management, recycling and hazardous waste treatment services, alongside water and wastewater treatment and energy services including district heating, energy efficiency, renewable…
Serves UK businesses, industrial operators, utilities and public sector bodies, including local authorities, with complex environmental, waste, water, energy, recycling and compliance needs.
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Computed from 5 filingsProvides engineering and environmental consultancy focused on water management and flood risk. Services include flood risk assessments, hydrological and hydraulic modelling, drainage and flood…
Serves property developers, landowners, planning applicants and public-sector bodies across the UK, from single-house schemes to large residential developments and government infrastructure projects.
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StrongStrong · Growing, Hiring · 4% CAGR over 4y
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Computed from 5 filingsProvides civil engineering consultancy services including infrastructure planning and design, transport planning, water, drainage and flood risk assessments, air quality and noise studies, and risk…
Serves private and public sector clients, including residential and commercial property developers, local authorities, and oil or petrochemical storage facility operators involved in development and…
Financial Health
StableStable · -66% CAGR over 4y
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- HDR11829965
Provides architecture, engineering, environmental and construction consulting services. Works on infrastructure and building projects including transportation, water, power, healthcare, education,…
Serves public and private sector organisations across infrastructure, government, healthcare, education, transport, energy, industrial, science, technology, real estate, hospitality and urban…
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Computed from 5 filingsProvides engineering and environmental design consulting services for infrastructure and development projects, including bridges, buildings, transportation systems, coastal and marine works, water…
Serves public-sector infrastructure owners, municipalities, ports, industrial operators, developers and building owners across bridges, transportation, water, coastal, marine and climate-resilience…
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WeakWeak
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Provides engineering, design, and consulting services for infrastructure and built environment projects, including transport systems, buildings, energy networks, and sustainability planning,…
Serves public and private sector clients developing major infrastructure, buildings, transport, energy and sustainability projects, including governments, developers, utilities, venue owners and…
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Provides engineering, design and consultancy services for the built environment, including infrastructure, transport systems, buildings and energy projects. Services cover planning, structural and…
Serves public- and private-sector clients commissioning major built-environment projects, including governments, transport authorities, utilities, developers, venue owners and infrastructure asset…
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Provides multidisciplinary engineering, design and consulting services for the built environment, including infrastructure, buildings, transport, energy systems and sustainability. Works on planning,…
Serves businesses and public sector clients delivering built environment and infrastructure projects, including developers, asset owners, utilities, transport authorities and government bodies across…
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Provides engineering, design, planning and consulting services for the built environment, including infrastructure, transport systems, buildings and energy networks. Undertakes feasibility studies,…
Serves public and private sector organisations commissioning built-environment projects, including infrastructure owners, transport and energy authorities, property developers, venue operators and…
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Provides multidisciplinary engineering, design, planning and consulting services for infrastructure and building projects, including transport systems, energy networks, sustainability, structural…
Serves public- and private-sector clients developing infrastructure, buildings, transport, energy and sustainability projects in the built environment.
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Provides waste management and recycling services, including hazardous and difficult‑to‑recycle materials, alongside water and wastewater treatment and industrial water services. Also delivers energy…
Serves UK businesses, industrial operators, property and facilities teams, local authorities and other public-sector bodies needing waste, water, energy and environmental compliance support.
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Provides engineering, design, construction, and maintenance services for water and wastewater infrastructure, including treatment plants, pipelines, drainage systems, and related utility networks as…
Serves infrastructure owners and operators, including major water and sewage companies, energy network operators, rail, highways and port clients, and natural resources companies.
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Provides strategy and regulatory consulting to organisations in the energy and water sectors, including utilities, network operators, investors and regulators. Advises on market reform, regulatory…
Serves B2B and public-sector clients in UK energy and water markets, including major water companies, electricity and gas network operators, energy retailers, investors, regulators and policymakers.
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Computed from 5 filingsProvides engineering, design and consulting services for the built environment, including infrastructure, buildings, transport and energy systems, covering planning, sustainability and…
Serves public and private sector clients in the built environment, including infrastructure owners, developers, energy providers, transport authorities, city governments, and organisations delivering…
Financial Health
DistressedDistressed · 0% CAGR over 4y
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Provides engineering, environmental and project management consultancy for renewable energy developments. Services include feasibility studies, planning and environmental assessments, energy yield…
Serves farmers and landowners, renewable energy portfolio developers, community groups, investors and lenders involved in small and medium-scale wind, solar PV, hydro, storage and hybrid projects…
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Provides waste management, recycling and hazardous waste treatment, water and wastewater services, and energy solutions including district heating, renewable energy systems, energy efficiency…
Serves UK businesses, industrial operators, local authorities and public sector bodies, including organisations managing facilities, packaging obligations, hazardous waste, utilities infrastructure…
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Provides water and wastewater services including treatment, plant optimisation, smart water systems, and industrial water management. Also delivers waste management, recycling, and energy services…
Serves UK businesses, industrial sites, utilities and public sector bodies, including commercial waste customers, producers with packaging or WEEE duties, and organisations with water, energy or…
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Computed from 3 filingsProvides commercial real estate due diligence consulting, including property condition assessments, structural and MEP engineering, environmental site assessments, construction risk monitoring,…
Serves commercial real estate investors, lenders, developers and property owners requiring due diligence, engineering, environmental, construction risk and ESG support across property transactions…
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HealthyHealthy · Hiring · 10% CAGR over 2y
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Provides engineering, consulting, and advisory services for transport and infrastructure projects. Works on rail, metro, highways, urban mobility, and energy systems, offering planning, design, data…
Serves public and private sector organisations commissioning transport, mobility and infrastructure projects, including rail, highways, airports, cities, local transport bodies, developers,…
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Provides engineering, design, planning and advisory services for infrastructure, buildings, transport and energy projects. Offers multidisciplinary consultancy including structural and mechanical…
Serves public- and private-sector clients in the built environment, including infrastructure owners, developers, transport authorities, energy networks, venue operators, and maritime or shipping…
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Provides engineering, design and consulting services for the built environment, including infrastructure, buildings, transport and energy systems, covering structural engineering, planning,…
Serves public and private sector clients in the built environment, including infrastructure owners, transport authorities, energy networks, property developers, venue operators, and city or regional…
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Provides engineering, design and technical consulting services for the built environment, including infrastructure, transport systems, buildings, energy networks and sustainability planning,…
Serves public and private sector clients including infrastructure owners, developers, energy companies, transport operators, governments and major building or venue owners across the built…
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Provides engineering, design and consulting services for the built environment, including infrastructure, buildings, transport and energy systems. Offers multidisciplinary expertise in planning,…
Serves public and private sector clients developing infrastructure, buildings, energy, transport, rail, maritime, sports and entertainment projects, including asset owners, developers, governments…
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Computed from 5 filingsProvides sustainability, environmental and engineering consultancy for construction and infrastructure projects, including energy audits, carbon and net‑zero strategy, environmental impact…
Serves developers, building owners, contractors and public/private-sector organisations in the built environment, including real estate, infrastructure and construction clients across the Middle…
Financial Health
WeakWeak · -42% CAGR over 5y
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Provides environmental consultancy, ecological monitoring and habitat restoration services, including aquatic surveys, water quality monitoring, river and wetland restoration, biodiversity net gain…
Serves water companies, Tier 1 contractors, construction and infrastructure firms, planning and development teams, landowners, and energy and renewables organisations.
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Provides engineering and environmental consultancy for the built environment, including building services engineering, energy and carbon analysis, sustainability, acoustics, fire safety, smart…
Serves property developers, real estate investors, asset owners and project teams delivering commercial buildings, masterplans and infrastructure, from inception through operation, especially in the…
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Computed from 4 filingsProvides engineering consultancy services including water management and flood risk assessment, transport planning, highway and drainage infrastructure design, and expert witness advice supporting…
Serves clients delivering small and large-scale developments and infrastructure nationwide, including residential, commercial, retail, leisure, education, private and mixed-use schemes.
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How London Environmental Consulting companies work and how to sell to them
What they do
Revenue usually comes through fee-for-service advisory work rather than subscriptions. London environmental consultancies price by fixed-fee reports, day-rate specialist input, monitoring packages, framework call-offs and longer programme retainers. The deliverable is usually evidence: impact assessments, permit applications, sampling plans, compliance files, risk registers and expert advice that can be used in planning, financing or regulatory discussions. Smaller assignments may sit around a single site condition or permit variation; larger engagements tend to follow construction, property or infrastructure programmes over several phases. Utilisation matters, but so does access to senior technical staff, field capacity and trusted subcontractors for laboratory, ecological or monitoring work.
Who they sell to
Most sell into organisations where environmental risk can delay a project, affect an asset valuation or create an operating restriction. Typical buyers include property developers, public-sector estates teams, utilities, infrastructure sponsors, waste operators, industrial sites and professional advisers acting for those clients. The named decision-maker varies: planning directors, heads of estates, general counsel, sustainability leads, project directors and procurement teams may all be involved. Lower-risk work can be bought through a direct brief from a project manager, while larger programmes tend to move through framework agreements, approved-supplier lists, tender processes or adviser-led procurement. Sales cycles often follow planning timetables rather than a neat budget year.
What they buy
Most environmental consulting firms tend to spend on tools and services that reduce delivery risk and make expert time easier to recover. Common categories include project management, document control, CRM, bid management, time recording, resource planning, finance, HR, quality management, geospatial analysis, data capture and reporting software. Field-heavy teams may also need sampling equipment, monitoring devices, fleet support, laboratory partners and specialist insurance. Growth-stage consultancies often buy recruitment support for technical roles, training linked to regulatory practice, legal advice on contracts and claims, and marketing help for framework bids or sector-specific thought leadership. Security and records management become more important where client files include sensitive site, infrastructure or legal material.
Why and how to sell to them
Environmental consulting buyers tend to evaluate vendors when delivery pressure rises: a run of new planning instructions, a framework win, a senior hire, a merger, a new regulated service line or a move from ad hoc projects into longer programmes. The sharper pain points are usually utilisation, evidence traceability, bid conversion, quality assurance, professional indemnity exposure and keeping senior specialists away from admin. Outbound works better when it maps to those constraints rather than to generic productivity claims. A useful angle is to show how the offer helps fee-earners submit evidence on time, protect audit trails, price work more accurately or support repeatable delivery across property, infrastructure and industrial clients.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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What do environmental consulting companies in London actually do?
How does London environmental consulting compare internationally?
How is this list built and how fresh is the data?
How big are the typical environmental consulting companies in London?
Are these mostly new or established environmental consulting companies?
What SIC codes does this use?
What buying signals should I look for?
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