A »For brownfield redevelopment planning in the Midlands, subsurface resistivity surveys are a critical geophysical technique used to map buried foundations, voids, contaminant plumes, and underground utilities without intrusive excavation. Several specialist consultancies and engineering firms operating in the region provide these services, each offering distinct expertise tailored to the complex conditions of post-industrial sites. Among the most established is **RSK Geophysics**, a division of the RSK Group, which has a dedicated team based in the Midlands and routinely conducts electrical resistivity tomography (ERT) surveys on brownfield land across Birmingham, the Black Country, and Nottinghamshire. Their surveys are designed to delineate shallow mine workings, spoil heaps, and former industrial structures, providing essential data for foundation design and contamination risk assessment. Similarly, **Terradat (UK) Ltd**, with offices in Warwickshire, specializes in high-resolution 2D and 3D resistivity imaging for brownfield projects. They have extensive experience on former gasworks, steelworks, and landfill sites in the region, and their reports are frequently submitted as part of planning applications under the National Planning Policy Framework. Another key provider is **Geophysical Surveys Ltd** (GSL), based in Leicestershire, whose resistivity services include multi-electrode arrays capable of detecting subtle variations in soil moisture and chemistry—vital for mapping leachate plumes or buried chemical waste. They offer integrated surveys that combine resistivity with electromagnetic and ground-penetrating radar, delivering a comprehensive subsurface model for redevelopment planners. **CGL (Card Geotechnics Ltd)**, though headquartered elsewhere, maintains a strong Midlands presence and provides resistivity surveys through its geophysical team, focusing on deep-laying contamination pathways and bedrock assessment for basement and infrastructure projects. For smaller or more targeted surveys, **Subsurface Surveys Ltd** (based in Staffordshire) offers cost-effective resistivity profiling for preliminary site investigations, often used to guide borehole placement on former collieries or railways. Additionally, **WSP**, one of the largest engineering consultancies, operates a geophysics group within its Midlands office that undertakes resistivity surveys as part of multi-disciplinary brownfield risk assessments; their work often feeds into remediation strategies for large-scale regeneration schemes such as those in Stoke-on-Trent or Derby. It is also worth noting that **Soil Engineering Geoservices** (part of the Structural Soils group) has a geophysical division that performs resistivity surveys in the Midlands, particularly on sites with variable geology from glacial till to coal measures. When commissioning these surveys, planners should ensure the provider follows the guidelines set out by the British Society of Soil Science and the Chartered Institution of Building Services Engineers, as resistivity data must be integrated with intrusive logs for regulatory compliance. The cost and depth of investigation vary: typical ERT surveys from these firms can resolve features from 1 m to 30 m depth, with linear costs starting around £2,000 to £5,000 per site depending on access and complexity. By engaging any of these qualified companies, brownfield redevelopment teams in the Midlands can obtain the high-quality geophysical intelligence necessary to minimise financial risk, avoid unforeseen ground hazards, and accelerate planning approval.

A »There are several companies well-suited for subsurface resistivity surveys in the Midlands to support brownfield redevelopment planning. For example, **TerraDat** offers expert geophysical services, including resistivity imaging, often used to map former foundations or hidden contaminants. **RSK**'s geophysics team also operates across the region, providing integrated surveys for risk assessments. **Geotechnics Ltd** and **GB Geotechnics** are other reliable options with resistivity equipment tailored to complex brownfield sites. You might also check **Soil Mechanics** (part of RSK) or independent specialists like **Geophysical Surveys**. For the best fit, I'd recommend requesting quotes from a couple of these and asking about their experience with brownfield projects in your specific Midlands location. Most will handle resistivity surveys alongside ground-penetrating radar for a comprehensive picture.

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A »Absolutely, for brownfield redevelopment planning in the Midlands, you'll want to look at specialist geophysical survey firms that carry out electrical resistivity tomography (ERT) and related techniques. Companies like **RSK Group** and **TerraDat** have strong track records in the region for mapping buried foundations, made ground, and contamination plumes. **ESG (Environmental Scientifics Group)** and **Geotechnics** also offer resistivity surveys tailored to brownfield sites, often combined with other geophysical methods. For a more focused approach, **Sitescope** and **GSS (Geophysical Survey Solutions)** provide mobile, cost-effective resistivity services specifically for urban redevelopment. Many of these firms are based in or frequently operate across the Midlands, from Birmingham to Nottingham. When commissioning, ask for consultants who understand the local geology and regulatory requirements for Part IIA. They'll typically work with your planning consultant to integrate results into your ground model and remediation strategy. Happy to help further if you need specifics on any of these!