Piling and earthworks compliance

Vibration and noise control

Piling operations generate ground-borne vibration and airborne noise that can affect neighbouring properties, their occupants, and building structures. Two separate legal frameworks control these impacts: the Control of Pollution Act 1974 (Sections 60 and 61) for construction noise, and the Environmental Protection Act 1990 (Sections 79-80) for statutory nuisance. The technical standards for assessment are set out in BS 5228 (noise and vibration control on construction sites) and BS 7385-2 (vibration damage guide values for buildings).

Vibration monitoring in practice

When piling near sensitive receptors (residential buildings, listed buildings, hospitals, schools), you must install continuous vibration monitoring equipment at the nearest receptor before piling begins. Vibration is measured as peak particle velocity (PPV) in mm/s at three orthogonal axes. Set trigger levels and alarm levels below the BS 7385-2 guide values for cosmetic damage, with the trigger level typically at 50% of the guide value to provide early warning.

Record and retain all vibration monitoring data for the duration of the project and for at least 12 months afterwards. If vibration readings approach trigger levels, stop piling and review the method before continuing. Alternative piling techniques (such as CFA or rotary bored piling instead of driven piling) may be required if vibration cannot be controlled within acceptable limits.

BS 5228 noise assessment

Before piling or earthworks begin, carry out a noise assessment in accordance with BS 5228-1 to predict noise levels at the nearest sensitive receptors. Use the ABC assessment method in Annex E to determine whether the predicted construction noise level represents a significant impact. The threshold depends on the existing ambient noise level in the area.

Section 61 prior consent applications

For piling operations likely to cause significant noise disturbance, consider applying for Section 61 prior consent from the local authority under the Control of Pollution Act 1974. A Section 61 consent specifies the approved working methods, permitted hours, noise limits, and vibration limits for your works. The key advantage is that obtaining prior consent provides a defence against a Section 60 notice or statutory nuisance proceedings, provided you carry out works in accordance with the consented methods.

Apply for Section 61 consent well before piling is due to start. Allow at least 28 days for the local authority to process the application. Include your noise and vibration assessment, proposed working hours, the piling method, and the monitoring arrangements you will put in place.

Contaminated land and waste management

Earthworks and piling on previously developed land frequently encounter contaminated soils. The regulatory framework for contaminated land is set out in Part 2A of the Environmental Protection Act 1990, supplemented by the Environmental Permitting Regulations 2016 for waste management and the Hazardous Waste Regulations 2005 for contaminated materials classified as hazardous.

Site investigation before earthworks

Before earthworks or piling begin on any brownfield or potentially contaminated site, commission a Phase 1 desktop study followed by a Phase 2 intrusive investigation in accordance with BS 10175. The Phase 1 study reviews site history, previous land uses, and environmental sensitivity. The Phase 2 investigation involves soil sampling, groundwater monitoring, and chemical analysis to characterise any contamination present.

Planning conditions for development on brownfield land almost always require Phase 1 and Phase 2 investigations, a remediation strategy, and verification reporting. Even where planning conditions do not explicitly require it, the contaminated land regime under Part 2A of the Environmental Protection Act 1990 creates a separate obligation to ensure land is not causing or likely to cause significant harm.

Materials Management Plans and the CL:AIRE DoWCoP

If you plan to reuse excavated soils on the same site or on a linked development site, the CL:AIRE Definition of Waste: Development Industry Code of Practice (DoWCoP) provides a framework for classifying those soils as non-waste. This avoids the need for an environmental permit or waste exemption for reuse activities.

To use the CL:AIRE DoWCoP, you must prepare a Materials Management Plan (MMP) demonstrating that the excavated materials are suitable for their intended use and do not pose an unacceptable risk. The MMP must be verified by a Qualified Person registered with a CL:AIRE-recognised professional body (such as a Specialist in Land Condition or Suitably Qualified Person). Once verified, a declaration is made to CL:AIRE and the materials may be reused without a permit.

If excavated soils cannot be reused under the CL:AIRE DoWCoP, they are classified as waste. Contaminated soils may be hazardous waste if they contain hazardous substances (such as asbestos, heavy metals, or hydrocarbons) above the threshold concentrations in the Waste Classification Technical Guidance WM3. Hazardous waste must be consigned to a suitably permitted facility, and consignment notes must be completed and retained for 3 years.

CDM particular risks

Piling and deep excavation work is classified as work involving particular risks under CDM 2015 Schedule 3. Several Schedule 3 categories may apply simultaneously to a piling or earthworks project, including work with risk of burial under earthfalls, work involving heavy prefabricated components, work near high voltage power lines, and work putting workers at risk from hazardous substances (contaminated soils).

Where Schedule 3 risks are present, the construction phase plan must include specific risk control measures for each identified risk. The principal contractor is responsible for ensuring these risks are identified before work begins, control measures are recorded and communicated, and compliance is monitored throughout.

What to do next

Before piling or earthworks begin

• Commission ground investigation - Phase 1 desktop study and Phase 2 intrusive investigation in accordance with BS 10175 to characterise ground conditions and any contamination
• Carry out noise and vibration assessment - predict impact at nearest sensitive receptors using BS 5228 and set monitoring trigger levels against BS 7385-2 guide values
• Apply for Section 61 prior consent if piling is near residential properties or other sensitive receptors, allowing at least 28 days for local authority processing
• Prepare pre-construction information under CDM 2015, including ground investigation reports, contamination data, and details of underground services
• Update the construction phase plan to address all applicable CDM Schedule 3 risks, with specific control measures for piling and excavation
• Prepare a Materials Management Plan if you plan to reuse excavated soils under the CL:AIRE DoWCoP, and engage a Qualified Person to verify it

Related guidance

For excavation support and trench safety requirements, see our guide on excavation and foundation safety. For temporary works management including propping and shoring for piled foundations, see managing temporary works on construction projects. For demolition works that may precede piling, see demolition safety and compliance.