PAS128 Survey

At PAS 128 Survey, we provide professional underground utility detection and mapping services in accordance with the PAS 128 specification across the UK. Our specialist team utilises advanced electromagnetic and radar technology to identify buried infrastructure and mitigate subterranean risks before ground is broken.

By establishing this clear digital foundation, the PAS 128 survey ensures that architectural and engineering teams work with verified site realities, which reduces the likelihood of accidental asset strikes and prevents the financial fallout of project delays.

What Services Are Included In PAS 128 Surveys?

Our PAS 128 survey includes a multi-layered technical sequence designed to provide absolute clarity regarding buried assets across your site:

• Desktop Record Searches – Compiling and analysing existing drawings from statutory undertakers to identify known utility corridors.
• Site Reconnaissance – Evaluating the physical environment to identify visible surface features like manholes and service valves.
• Electromagnetic Locating – Using radio-frequency transmitters to trace the exact route of conductive metallic pipes and power cables.
• GPR Scanning – Deploying radar pulses to identify non-metallic assets such as plastic gas pipes and fibre optic conduits.
• CAD Data Production – Converting raw field observations into structured digital drawings that follow standard architectural drafting conventions.

Why Should You Choose Professional PAS 128 Survey Services?

Choosing our professional PAS 128 survey ensures that your project is built upon a foundation of absolute technical integrity and subsurface accuracy. Qualified professionals use regularly calibrated instrumentation that unvetted providers lack, which minimises the risk of striking high-pressure gas mains.

This expert oversight maximises site safety, providing a clear audit trail and protecting your investment from the financial fallout of accidental asset damage or project shutdowns.

How Much Does PAS 128 Survey Cost?

The PAS 128 survey cost ranges from £3,000 to over £15,000 per project, depending on the site acreage, the complexity of the utility network, and the specific Quality Level required.

Pricing is primarily influenced by the time required for on-site scanning and the density of the search grid needed for high-resolution results. Technical drivers such as soil conductivity for radar penetration, the requirement for traffic management, and the depth of computational data processing to create layered CAD drawings or 3D models contribute to the final professional fee.

Contact PAS 128 Survey to get customised prices for PAS 128 survey at your property.

Where Are PAS 128 Surveys Required Across Projects?

A specialist PAS 128 survey is a mandatory requirement for construction sites, highway developments, and complex infrastructure projects across the nation where excavation is planned. The service is critical for brownfield redevelopment and rail schemes where legacy records are often missing or highly inaccurate.

By mapping these specific environments, the process ensures that safe digging zones are established, protecting site teams from high-voltage electrical strikes and preventing the significant financial costs of service disruption.

When Should You Carry Out A PAS 128 Survey?

You should carry out a PAS 128 survey during the early feasibility or pre-design phase of a project, well before any drilling, piling, or excavation begins on-site. Early detection identifies conflicting buried services that could require expensive diversions if discovered mid-construction.

Engaging our team early ensures your structural designs are feasible, which prevents project delays and satisfies the technical due diligence requirements of lenders and insurers for high-value developments.

How Does The PAS 128 Survey Process Work?

The technical workflow for a PAS 128 survey involves a sequence of site assessment, electronic data capture, and meticulous office-based processing to ensure geospatial integrity. Our geomatic engineers walk the site in a structured grid pattern, capturing signal reflections from every subterranean feature to ensure nothing is overlooked.

This methodology ensures every anomaly is logged with precision, resulting in a layered drawing that acts as the indisputable technical evidence required for safe site handovers.

What Detection Methods And Survey Types Are Used In PAS 128 Surveys?

We utilise several advanced detection methods through a PAS 128 survey to ensure no subsurface feature is overlooked during our investigation:

• Electromagnetic Locators – Identifying conductive underground services by tracing magnetic fields generated by live power or induced signals.
• Ground Penetrating Radar – Transmitting electromagnetic pulses to detect non-metallic utilities and subsurface structural features like voids.
• Quality Level B – Providing a high-accuracy map where services are detected and confirmed using at least two different geophysical methods.
• Quality Level A – Confirming the exact depth and position of utilities through invasive verification, such as vacuum excavation.
• Gyroscopic Mapping – Using internal sensors to map the precise route of deep-bore pipes where surface-based detection is restricted.

Which Industries And Projects Require PAS 128 Surveys?

A diverse range of professional sectors relies on a PAS 128 survey to manage the safety and financial risks of their physical developments:

• Civil Engineering Firms – Requiring precise utility mapping to design safe and compliant highways, bridges, and subterranean infrastructure.
• Property Development Groups – Using radar data to verify land suitability and avoid the high costs of unknown obstructions.
• Utility Providers – Needing accurate asset location to minimise service disruption during network maintenance or new connections.
• Local Authorities – Commissioning highway surveys to prevent accidents and manage the long-term integrity of public roads.
• Renewable Energy Contractors – Mapping cable routes for wind and solar farms to ensure efficient and safe grid connectivity.

How Quickly Can A PAS 128 Survey Be Completed?

Most field operations for a PAS 128 survey can be completed within one to three working days, depending on the scale and complexity of the terrain. Following the on-site work, the digital processing phase takes an additional forty-eight hours to ensure all signals are correctly interpreted.

This efficiency ensures your project timeline remains predictable, providing you with the high-resolution maps needed to move safely into the groundwork phase without delay.

What Standards And Compliance Requirements Apply To PAS 128 Surveys?

Every inspection conducted for a PAS 128 survey adheres to the rigorous national standard for underground utility detection and mapping to ensure total technical consistency. We also ensure full compliance with HSG47 guidance for safe digging and relevant health and safety regulations for site investigations.

Following these UK standards ensures your results are legally defensible, providing the insurance-backed certainty that developers and lenders demand when funding or protecting high-value land investments.

Contact PAS 128 Survey for a consultation to get a PAS 128 survey tailored to your organisation’s risks and responsibilities.