Environmental & Technical Due Diligence (ETDD)
A comprehensive pre-acquisition due diligence programme — scoped, coordinated, and interpreted by ARRC as principal adviser, drawing on a network of specialist partners to deliver the complete environmental and technical picture a developer, lender, or investor needs before committing to a site.
What a site does not reveal without examination
Land acquisitions carry environmental and technical risks that a site visit, a title search, or a desktop review of planning records will not surface. Soil contamination from prior use. Flood exposure that historical mapping understates. Ground conditions that make the proposed development unviable or materially more expensive than appraised. Proximity risks — to airports, industrial facilities, utility infrastructure, or sensitive receptors — that constrain what can be built and how.
Environmental & Technical Due Diligence is the structured process that brings these risks to the surface before acquisition — when the findings can determine the purchase price, the conditions precedent, the development brief, or the decision not to proceed. The same findings discovered after unconditional exchange become the acquirer's liability, not a negotiating position.
ARRC acts as principal adviser throughout — scoping the programme, briefing and coordinating specialist assessment partners, quality-assuring their outputs, and synthesising findings into a single integrated report with clear conclusions. The client has one point of accountability, one set of recommendations, and one report designed for the decision at hand.
An ETDD programme with fifteen separate specialist reports and no integrating intelligence is not due diligence — it is a collection of assessments. The value is in the synthesis: understanding what the combination of findings means for the acquisition, the development, and the decision.
Principal adviser — not a subcontractor
ARRC does not perform all ETDD assessments directly. What ARRC provides is the advisory intelligence that makes a multi-specialist ETDD programme coherent and actionable: scoping the right assessments for the site and intended use, briefing specialist partners to ARRC's standard, coordinating fieldwork, quality-assuring technical outputs, and synthesising everything into an integrated report that tells the client what the findings mean — not just what they are.
This model gives clients access to the full depth of specialist technical capability — geotechnical engineers, ecologists, acoustic consultants, air quality specialists, structural engineers — without the fragmentation that comes from commissioning them independently. ARRC holds the brief, owns the timeline, and is accountable for the integrated output.
Programme scoping
ARRC determines which assessments are required for the specific site, location, and intended development use — avoiding both over-scoping (assessments that add cost without decision value) and under-scoping (gaps that create liability after acquisition).
Specialist partner coordination
ARRC briefs, appoints, and manages specialist assessment partners — ensuring their scope, methodology, and output format align with the ETDD programme requirements and the commissioning party's due diligence standard.
Quality assurance & integration
ARRC reviews all specialist outputs for completeness, consistency, and relevance — and integrates findings across workstreams into a single coherent report. Cross-workstream dependencies (e.g. flood risk informing geotechnical scope) are identified and managed.
Acquisition recommendation
The integrated ETDD report concludes with ARRC's clear recommendation — proceed, proceed subject to conditions, or do not proceed — with the risk register and development implication analysis that supports it.
Assessment scope
The assessments included in an ETDD programme are determined by site context, intended use, and lender or investor requirements. The following represent the full scope from which programmes are composed.
Flood Risk Assessment
Fluvial, pluvial, groundwater, and coastal flood exposure — using current hydrological data, climate-adjusted return period analysis, and site-specific drainage context. Mapped to applicable planning policy and lender requirements.
Terrain Profiling & Topographic Survey
Ground levels, slope gradients, drainage flow paths, and physical site characteristics governing development layout, earthworks requirements, and infrastructure design. Conducted using survey-grade instrumentation.
Drone Survey & Aerial Photogrammetry
High-resolution orthomosaic mapping, digital surface modelling, volumetric analysis, and visual inspection of site features not accessible at ground level. Drone data integrates with topographic and geotechnical findings.
Geotechnical Investigation
Soil bearing capacity, groundwater levels, settlement risk, shrink-swell potential, and subsurface constraints relevant to foundation design and construction methodology. Findings directly inform development cost estimates and programme risk.
Soil Testing & Contamination Assessment
Phase I desk study and Phase II intrusive investigation — identifying actual and potential soil contamination from historical land uses, assessing extent and risk to proposed development, and determining remediation requirements where contamination is confirmed.
Hydrogeological Survey
Groundwater depth, flow direction, recharge characteristics, and sensitivity to contamination — informing foundation design, basement construction feasibility, and the risk of groundwater-driven contamination migration to the proposed development.
Air Quality Baseline Testing
Measurement of key pollutants, particulate matter, and ambient air quality conditions relevant to the proposed development use — establishing the baseline required for planning submissions, EIA screening, and environmental due diligence requirements.
Noise & Vibration Assessment
Baseline noise levels, vibration sources, and acoustic sensitivity of the site — assessing constraints on development use, requirements for acoustic mitigation, and compliance with applicable planning thresholds and BS 4142 / BS 8233 standards.
Ecological Survey
Flora, fauna, and protected species presence — including Phase 1 habitat survey, bat surveys, great crested newt screening, and other species-specific surveys triggered by site characteristics. Ecological constraints can materially affect development layout, timing, and cost.
Heritage & Archaeological Desk Study
Statutory designations, listed buildings, conservation areas, scheduled monuments, and archaeological potential — establishing the heritage constraints that will affect planning consent and the scope of any required archaeological investigation.
Environmental Impact Assessment (EIA) Screening
Assessment of whether the proposed development requires formal EIA — including screening against applicable thresholds, identification of sensitive receptors, and scoping of the EIA topics that would need to be addressed if EIA is required.
Utilities & Infrastructure Capacity
Electricity, water, gas, drainage, and telecommunications — capacity adequacy for the proposed development, connection costs, and constraints that would affect development viability or programme. Utility constraints are among the most commonly underestimated development cost risks.
Traffic & Access Impact Study
Site access options, highway network capacity, trip generation, and the transport infrastructure requirements that will affect planning consent conditions and development cost — including junction modelling and Transport Assessment requirements.
Planning & Regulatory Compliance Review
Assessment of the site's planning history, applicable local plan policies, development plan designations, and the regulatory compliance requirements that will govern the proposed development — including any consents, licences, or permits that will be required.
Seismic Risk Assessment
Ground motion hazard, fault proximity, liquefaction potential, and seismic design requirements — applicable in seismically active jurisdictions and required for high-criticality facilities including data centres, energy installations, and critical infrastructure regardless of location.
Data centre site selection — ANSI/TIA-942-B criteria
Data centre development requires a site selection due diligence standard that goes beyond conventional ETDD. ANSI/TIA-942-B — the internationally recognised standard for data centre infrastructure — defines specific site suitability criteria that must be assessed before a site is committed to for data centre use. ARRC applies these criteria as a structured screening framework within the ETDD programme for data centre clients.
Natural hazard screening
Proximity risk — sensitive neighbours & hazard sources
How the ETDD programme is managed
A four-stage programme — from scoping through specialist fieldwork and analysis to integrated reporting — managed by ARRC as principal adviser throughout.
Programme Scoping & Desktop Review
ARRC scopes the ETDD programme for the specific site, location, intended use, and commissioning context — determining which assessments are required and at what depth, identifying the specialist partners appropriate for each workstream, and establishing the programme timeline to meet the acquisition timetable. Desktop review of historical maps, environmental records, planning history, and regulatory designations informs the scoping decisions and identifies the risk hypotheses that fieldwork must test.
Specialist Partner Briefing & Mobilisation
ARRC briefs each specialist assessment partner — defining their scope, methodology requirements, output format, and timeline. Partners are mobilised in a coordinated sequence that manages site access efficiently and ensures fieldwork from different workstreams is conducted in the right order (geotechnical investigation, for example, is timed to follow ecological clearance surveys where required). ARRC manages all specialist partner interfaces on the client's behalf.
Fieldwork, Analysis & Quality Assurance
Specialist partners conduct their respective assessments — with ARRC providing ongoing quality assurance of field methodology, reviewing preliminary outputs, and identifying where findings from one workstream should expand or modify the scope of another. Cross-workstream dependencies are actively managed throughout: a flood risk finding that elevates groundwater risk, for example, triggers an expanded hydrogeological scope rather than a gap in the integrated report.
Integrated Reporting & Acquisition Recommendation
ARRC synthesises all specialist outputs into a single integrated ETDD report — structured around the acquisition decision rather than the assessment workstreams. The integrated risk register maps all identified risks by severity and development implication. The development implication analysis quantifies the cost, programme, and feasibility consequences of key findings. The report concludes with ARRC's clear acquisition recommendation: proceed, proceed subject to conditions, or do not proceed.
ETDD deliverables
A structured report package — designed for use by developers, lenders, investors, and regulatory bodies in the acquisition decision process.
Integrated ETDD Report
The primary deliverable — a comprehensive assessment of site environmental and technical conditions synthesised across all workstreams, with integrated risk findings, development implications, and a clear acquisition recommendation. Structured to meet lender, investor, and IFC PS1 due diligence requirements where applicable.
Risk Register & Development Implications Summary
A consolidated risk register mapping all identified environmental and technical risks — rated by severity and development impact, with cost and programme implications quantified where sufficient data exists. Designed for direct use in investment committee and credit committee presentations.
Survey Mapping & GIS Outputs
Drone survey orthomosaics, digital surface models, topographic plans, and constraint mapping — provided in standard GIS and CAD-compatible formats for direct use by the development team, structural engineers, and planning consultants.
Specialist Assessment Reports
The full set of individual specialist assessment reports — each produced to the applicable professional standard and formatted for inclusion in a planning application, lender due diligence file, or regulatory submission as required.
Data Centre Site Suitability Report
For data centre commissions — a structured ANSI/TIA-942-B site suitability assessment covering all natural hazard and proximity risk criteria, with a clear suitability rating and a gap analysis of any conditions or mitigations required to achieve the target tier classification.
Executive Summary & Acquisition Recommendation
A standalone executive summary — presenting the key findings, the overall site risk profile, and ARRC's clear recommendation on whether to proceed with acquisition, subject to conditions, or not to proceed. Formatted for board, lender, and investor presentation.
Who commissions an ETDD and why
ETDD is commissioned whenever environmental or technical site risk could materially affect the acquisition decision, development viability, or funding terms.
Developer or acquirer — before committing to purchase
The primary scenario. Findings before unconditional exchange inform the price, the conditions precedent, or the decision not to proceed. The same findings after exchange become the acquirer's liability. The timing of ETDD is as important as its scope — and ARRC is explicit with clients about the window in which findings have the most value.
Financier — as a condition of funding
Lenders providing development finance or acquisition loans increasingly require independent ETDD as a condition of credit approval. The IFC Performance Standards and the Equator Principles — adopted by the majority of international project finance lenders — require environmental and social due diligence for covered transactions. ARRC's ETDD programme meets PS1 requirements where applicable.
Institutional investor — ESG due diligence
Institutional investors — real estate funds, infrastructure funds, pension funds, and sovereign wealth funds — require environmental and technical due diligence as part of ESG investment screening and ongoing portfolio management. An independently conducted ETDD provides the evidence base that investor ESG frameworks require and that internal assessments cannot credibly supply.
Commission an independent ETDD
Whether you are approaching a land acquisition, responding to a lender's due diligence requirement, or conducting investor ESG screening for a new asset — ARRC will scope and manage an ETDD programme that gives you the complete, integrated picture of what the site contains before you commit to it.
Initial conversations are obligation-free. We will discuss the site, the proposed use, the commissioning context, and what a scoped ETDD programme would involve.