Construction noise and vibration limits under BS 5228
The limits depend on how quiet the area already is. The threshold categories, the gap between felt vibration and damaging vibration, and why prior consent is worth having.
BS 5228 construction noise limits are not a single number. The standard sets out methods for judging whether construction noise has an adverse effect at a receptor, and the most widely used of them, the threshold method in the noise part of the standard, gives different limits depending on how quiet the area already is. A site next to a dual carriageway is allowed more than a site in a quiet cul de sac, which is exactly how neighbours experience it.
The vibration part of the standard deals separately with perception and with building damage, and the gap between those two is wide enough that most complaints concern vibration people can feel rather than vibration that could harm anything.
How significance is judged
Two assessment routes appear in the standard's annex on significance. The threshold method compares predicted construction noise at a receptor with a category value chosen according to the existing ambient level. The change method looks instead at how much the total noise level rises above the baseline, with a stated change treated as the trigger.
Councils usually accept either, and some ask for both. What they will not accept is a prediction with no stated method, no plant inventory and no calculation.
The prediction itself is arithmetic from the standard: sound power or sound pressure data for each item of plant, the distance to the receptor, screening from hoardings and structures, the proportion of the working period each item is in use, and the resulting level over the assessment period. Attach the calculation sheets. An officer who can follow the sum will argue about assumptions rather than about credibility.
The threshold method and its categories
The categories are set by the ambient noise at the receptor without construction. Where the ambient level is below the lowest category value, category A applies. Where it falls between category values, the next category up applies, and so on.
| Period | Category A | Category B | Category C |
|---|---|---|---|
| Weekday daytime | 65 dB | 70 dB | 75 dB |
| Evenings and weekends | 55 dB | 60 dB | 65 dB |
| Night | 45 dB | 50 dB | 55 dB |
Values are in dB LAeq over the relevant period at the facade. Exceeding the applicable value indicates a potential adverse effect, which triggers the need for mitigation and for a conversation with environmental health rather than an automatic refusal.
Two practical points. First, the baseline survey has to be representative, so a survey taken during a school holiday or during a road closure will be challenged. Second, the category can differ between receptors on the same site, and a single limit applied across a mixed frontage will be either meaningless or unnecessarily tight.
Vibration: perception, complaint and damage
Vibration is measured as peak particle velocity in millimetres per second, and the useful thing to understand is the order of magnitude between the levels involved.
Vibration becomes just perceptible in a residential setting at a fraction of a millimetre per second. It becomes clearly perceptible, and complaints become likely, around one millimetre per second. Guide values for cosmetic damage to residential buildings sit an order of magnitude higher than that, which is why the honest answer to a neighbour worried about cracks is usually that the works will be felt but are very unlikely to cause harm.
That gap shapes the mitigation. Where the risk is complaint rather than damage, the answers are method selection and communication: augered piling instead of driven, hydraulic splitting instead of breaking, and telling residents in advance which week the worst of it happens.
Where a listed building, a historic structure or sensitive equipment sits nearby, the assessment changes. Lower limits are set, a condition survey with crack monitoring is carried out before work starts, and trigger levels are agreed with an action at each level.
Agreeing limits with environmental health
Do this before the application is determined, not after. An officer who has seen the plant inventory and the predicted levels will usually agree a set of limits that can be written into the management plan, and that agreement removes the risk of a condition imposing a figure the works cannot meet.
Bring four things to that meeting: the baseline survey, the plant list with sound power data, the predicted levels at each receptor for each phase, and the proposed working hours. Ask what the council's standard hours are, because they vary and a scheme programmed on the wrong assumption loses weeks.
Expect to negotiate on the noisiest phases. Demolition, piling and ground works usually exceed the applicable value at the nearest receptors however carefully they are planned, and the workable outcome is a limited period with extra mitigation, agreed in advance, rather than a limit everyone knows will be breached.
Prior consent under section 61
Section 61 of the Control of Pollution Act 1974 lets a contractor apply to the local authority for prior consent to carry out works in a specified way. The application sets out the works, the methods, the plant, the hours and the steps taken to minimise noise.
The value of a consent is protection. Where works are carried out in accordance with it, the authority cannot serve a notice under section 60 imposing different requirements for the same works. Without one, a notice can arrive mid-contract and change the programme.
The authority has 28 days to determine the application, after which the applicant may appeal to the magistrates' court. Build that period into the pre-construction programme, and apply again if the method changes materially, because a consent covers what it describes and nothing else.
Consent does not displace the statutory nuisance regime entirely, and residents keep their own remedies, a point explored in statutory nuisance after planning permission is granted.
Monitoring and responding to complaints
Continuous monitoring at the most exposed receptors, with alarms at an agreed trigger level, turns an argument into a record. Fixed monitors with remote reporting are now inexpensive enough that the cost is trivial against a single week of delay.
Set the response procedure out in writing before anyone complains: a single contact number, a named person, a target response time, a site log of every complaint with the action taken, and a rule that the log is available to the council on request.
Most complaints are about unexpected noise rather than loud noise. A letter drop a fortnight before the piling rig arrives, with dates and a phone number, prevents more complaints than an extra three decibels of hoarding.
What belongs in the management plan
- The baseline survey, receptor locations and the categories applied at each.
- Phase by phase plant inventories with predicted levels and the calculation method.
- Working hours, including any agreed exceptions and the notice given for them.
- Mitigation: plant selection, screening, siting of compounds, enclosures, and the method chosen for piling and breaking.
- Vibration trigger levels, monitoring positions and the action at each level.
- Complaint procedure, contacts and the log format.
- The section 61 application status and any consent obtained.
That document is normally secured by a condition requiring a Construction Management Plan to be approved before commencement, with a Construction Traffic Management Plan alongside it where highway impact is in issue. Screening is the item most often over-claimed, so check what an acoustic barrier actually achieves before the layout depends on it.
Where the completed development itself will be exposed to noise, that is a separate assessment and a separate document, and the Noise Impact Assessment should not try to do both jobs at once. PlanScope drafts both in minutes, structured to UK planning policy, with measured data flagged for your acoustician. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required.
Frequently asked questions
What noise limits apply to construction work?
There is no single figure. The threshold method in BS 5228 sets a category value according to the existing ambient level at each receptor, with lower limits in quiet areas and in the evening and at night. Exceeding the applicable value indicates a potential adverse effect and triggers mitigation and discussion with environmental health.
At what level does vibration damage buildings?
Guide values for cosmetic damage to residential buildings sit around an order of magnitude above the level at which vibration becomes clearly perceptible. Complaints typically begin near one millimetre per second peak particle velocity, well below any damage threshold, so most vibration issues on site are about perception rather than harm.
What does a section 61 consent do?
It gives prior approval for works carried out in the way described, and protects the contractor from a section 60 notice imposing different requirements for those same works. The authority has 28 days to determine the application, with a right of appeal to the magistrates court, and a material change of method needs a fresh application.
Should limits be agreed before or after permission?
Before. An officer who has seen the baseline survey, the plant inventory and the predicted levels will usually agree limits that can be written into the management plan, which avoids a condition imposing a figure the works cannot meet. Bring the proposed working hours and ask what the council's standard hours are.
How much difference does an acoustic hoarding make?
Less than most method statements claim. Screening only works where it breaks the line of sight between source and receiver and is continuous and heavy enough to matter, so upper floors of nearby flats often gain very little. Check the geometry before the mitigation case depends on the hoarding.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.