Noise and Vibration Complaint Investigations

When an Investigation Is Needed

Noise and vibration complaints can come from residents, tenants, hotel guests, office occupiers or neighbouring properties. Common examples include hearing neighbours through a separating wall or floor, impact noise from footsteps, hums from plant, rattling from fans, vibration from machinery or noise from licensed premises.

An independent investigation helps building owners, management companies, developers, contractors and operators understand whether there is a real problem, what is causing it and what can be done. It also gives all parties an objective basis for discussion, which is often more useful than repeated exchanges of opinion. In many cases the investigation shows that a modest, targeted fix will resolve the problem, avoiding wider and more disruptive work. In others, it confirms that the construction or plant meets the relevant standard, which is equally useful to know.

Wave Dynamics works for companies, including building owners, management companies, developers, contractors and operators, rather than acting for individual complainants.

How We Investigate

Each investigation is planned around the complaint. We start by gathering information about what is heard or felt, when it happens and where. We then carry out a site visit to inspect the construction and likely sources before deciding on the measurements needed.

Review of drawings, specifications and any previous test results
Discussion with the client and the building manager, and a review of the complaint record, to understand the pattern of the problem
Inspection of the relevant walls, floors, plant, services penetrations and junctions
Attended or unattended measurements, timed to capture the problem when it occurs

Where a complaint is intermittent, unattended monitoring over several days with audio recording can help link events to a specific source.

Sound Insulation Complaints in Apartments and Homes

Complaints about hearing neighbours often lead to testing of the separating walls and floors. Field measurements are carried out in line with I.S. EN ISO 16283 and the results are compared with the relevant Building Regulations guidance and any project specification. See our sound insulation testing page for more on the test methods.

Poor results are not always caused by the main wall or floor. Common causes include flanking transmission through connected walls, floors and ceilings, gaps around service penetrations, missing or bridged resilient layers, and workmanship defects. Opening up a small area of ceiling or lining is sometimes needed to confirm what has been built. We identify the most likely causes, give remedial advice and retest once the work is complete.

Plant and Building Services Noise

Mechanical and electrical plant is a frequent source of complaints, particularly where it runs at night. Problems include tonal hums from fans and transformers, low frequency noise from compressors, and structure-borne noise from poorly isolated equipment.

We measure the noise in the affected rooms and at the plant, often with the plant switched on and off so its contribution can be separated from other sources. Frequency analysis helps identify tonal or low frequency content. The findings are then used to recommend measures such as attenuators, enclosures or replacing isolators, as described on our building services noise and vibration control page.

Vibration Complaints

Vibration can come from plant, gym activity, industrial processes, road or rail traffic or construction work. Occupants may feel movement in floors, notice rattling of windows or fittings, or hear a low rumble caused by vibrating structures.

We measure vibration in the affected building and at the suspected source. Human response to vibration in buildings is commonly assessed using BS 6472-1, while potential for building damage is assessed against separate guidance. Our vibration and gym noise and vibration services cover these areas in more detail.

Environmental and Neighbour Noise

Complaints about commercial, industrial or entertainment noise affecting homes need careful measurement of both the source and the existing background. For industrial and commercial sources, BS 4142:2014+A1:2019 provides a method for assessing the likelihood of adverse impact. Entertainment noise is usually assessed against planning conditions, licensing requirements or criteria agreed with the local authority.

Whether we are acting for the operator or for the people affected, we report the measured levels, the method used and the assessment against relevant criteria. Where needed, we recommend operational controls or physical mitigation to reduce the impact.

Preparing for the Site Visit

A little preparation makes the investigation quicker and the results more useful. Before we attend, it helps if the client can provide:

A short description of the problem, including when it happens and how long it lasts
Any log of dates and times kept by the people affected
Drawings, specifications and details of the construction or plant involved
Contact details for anyone who needs to give access to rooms, plant areas or neighbouring units

Where the source is a piece of plant or an activity that can be controlled, we arrange for it to be operated during our visit so that measurements can be taken with it running and switched off. This is often the most direct way of confirming the cause.

Reporting and Remedial Advice

Our investigation reports set out what was measured, how it compares with the relevant standards or criteria, the most likely cause of the problem and the recommended remedial options. We keep recommendations proportionate and practical, and explain the expected improvement where this can be estimated.

Once remedial work has been carried out, we can return to repeat the measurements and confirm whether the problem has been resolved. This gives the building owner and contractor a clear record that the matter has been addressed.

Frequently Asked Questions

Who usually commissions a noise complaint investigation?

We carry out investigations for companies: management companies, landlords, developers, contractors and businesses responding to complaints. The method is the same whoever appoints us. We report the measurements and findings objectively, so the results can be shared with all parties and used to agree a way forward.

Can you measure noise that only happens occasionally?

Yes. For intermittent problems we can leave sound or vibration monitoring equipment in place for several days or longer. Audio recording, where appropriate and with consent, helps identify individual events. A log of event times kept by the people affected can also be compared with the measured data to confirm the source.

What is flanking transmission?

Flanking transmission is sound passing between rooms through paths other than the main separating wall or floor, such as connected external walls, floor slabs, ceiling voids, ducts or pipework. A well built separating wall can still perform poorly if flanking paths are not detailed and built correctly, which is a common finding in complaint investigations.

What legal routes exist for noise complaints?

In Ireland, a person affected by noise can make a complaint to the District Court under Section 108 of the Environmental Protection Agency Act 1992, and local authorities have powers to deal with noise. In the UK, statutory nuisance provisions under the Environmental Protection Act 1990 apply. We provide technical evidence, not legal advice.

Will you need access to the neighbouring property?

For sound insulation testing between dwellings, access to both rooms is needed, because a sound source is set up on one side and measurements are taken on the other. For plant or environmental noise, access to the source site is helpful but not always essential. We discuss access arrangements at the start of the investigation.

How do you confirm the remedial works have worked?

We repeat the original measurements under the same conditions after the remedial work is finished, and compare the before and after results. For sound insulation this means retesting the same rooms. For plant noise, the plant is run at the same duty. This gives a clear, measured record of the improvement achieved.