Risk Assessment for Demolition Vibration Near Buildings — UK

UK construction-safety guidance by the Riskora Editorial Team

Ground-borne vibration is the most under-assessed hazard in UK demolition. Cosmetic cracking in adjacent occupied buildings is what generates the complaints, the Section 80 abatement notices and the party-wall claims — and almost all of it could be predicted from a vibration risk assessment that actually engages with BS 7385-2 and BS 5228-2 rather than restating the standard's existence. The technical anchor is unambiguous: BS 7385-2:1993 sets the building-damage guide values for transient vibration (15 mm/s peak particle velocity at the foundation for residential reinforced/framed structures at 4 Hz rising with frequency, halved for unreinforced or light framed buildings, and a much lower threshold for historic or sensitive structures), and BS 5228-2:2009+A1:2014 Annex B provides predicted PPV ranges by demolition method. The risk assessment has to translate those values into a site-specific monitoring regime with trigger, action and stop levels — and tie each level to a named response. This page sets out what an inspector, a party-wall surveyor and a local-authority EHO expect to see.

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Example Risk Assessment

Risk Assessment for Demolition Vibration Near Buildings — UK

  • Identification of the receptor: building type (reinforced/unreinforced, residential/commercial/heritage), foundation type, condition class, listed or Grade II* status
  • Predicted PPV at each receptor, using BS 5228-2 Annex B Equation B.1 (Hiller & Crabb scaled distance) for the planned demolition method and distance
  • Trigger / action / stop levels: trigger at 50% of the guide value (review controls), action at 75% (change method), stop at the BS 7385-2 guide value or the lower limit agreed with the EHO under Section 61
  • Monitor placement: triaxial geophone at the receptor foundation (not on the demolition side), additional monitor at the nearest heritage façade, real-time SMS/email alerts to the site manager and demolition engineer
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When This Document Is Required

Required wherever demolition takes place within the predicted zone of influence of an occupied or sensitive structure — typically 25 m for hand demolition and concrete-cutting, 50 m for hydraulic breakers and pulverisers, and up to 100 m for ball-and-chain or explosive demolition (BS 5228-2 Annex B). Under CDM 2015 Reg 13 the principal contractor must plan, manage and monitor the work; under the Environmental Protection Act 1990 the local authority can serve a Section 80 abatement notice if vibration constitutes a statutory nuisance, and Section 61 of the Control of Pollution Act 1974 lets the contractor agree predicted limits with the EHO in advance. The Party Wall etc. Act 1996 will frequently apply where work is within 3 m or 6 m of a neighbour's structure. BS 6187:2011 (the demolition standard) requires the demolition engineer's plan to address vibration effects on adjacent structures. Insurers typically require pre-condition (dilapidation) surveys and continuous monitoring as a condition of cover.

What Must Be Included

  • Identification of the receptor: building type (reinforced/unreinforced, residential/commercial/heritage), foundation type, condition class, listed or Grade II* status
  • Predicted PPV at each receptor, using BS 5228-2 Annex B Equation B.1 (Hiller & Crabb scaled distance) for the planned demolition method and distance
  • Trigger / action / stop levels: trigger at 50% of the guide value (review controls), action at 75% (change method), stop at the BS 7385-2 guide value or the lower limit agreed with the EHO under Section 61
  • Monitor placement: triaxial geophone at the receptor foundation (not on the demolition side), additional monitor at the nearest heritage façade, real-time SMS/email alerts to the site manager and demolition engineer
  • Dilapidation survey of every receptor within the zone of influence, signed by both parties, photographed and time-stamped — pre-works baseline for any later cosmetic-damage claim
  • Method-related controls: hand-demolition or muncher within sensitive zones, hydraulic breaker only outside agreed exclusion radius, no ball-and-chain within 30 m of occupied structures, sequenced top-down demolition to reduce slab impact loads
  • Party-wall agreements where the Act applies — surveyor instructed, award in place, schedule of condition annexed
  • Section 61 consent application referenced (where applicable) with the agreed working hours, predicted noise and vibration limits, and complaint procedure
  • Occupant communication: letter-drop in advance with site manager mobile, weekly bulletin, named single point of contact for complaints, complaint log
  • Stop-work and review trigger: action level breached twice in a shift, or stop level breached once — work halts, demolition engineer reviews method before restart
  • Records retained: monitor data, dilapidation photos, complaint log, Section 61 correspondence, party-wall award — all for the project lifetime plus 15 years per CDM expectations

Common Mistakes to Avoid

  • Quoting the BS 7385-2 15 mm/s guide value as a single project limit without halving it for unreinforced masonry, lowering it further for heritage structures, or applying the frequency correction below 4 Hz
  • Locating the vibration monitor on the demolition side of the receptor or on a hardstanding — readings must be at the foundation of the building being protected, not in the line of fire
  • Skipping the dilapidation survey on the basis that 'the neighbour wouldn't let us in' — without a baseline, every pre-existing crack becomes the contractor's liability
  • Setting one trigger value equal to the guide value with no action level — by the time the limit is hit there is no margin to change method before damage occurs
  • Predicting PPV from a generic table rather than the BS 5228-2 Annex B Hiller & Crabb equation parametrised for the actual plant and ground conditions
  • Treating the Party Wall Act as optional — work proceeding without an award exposes the contractor to a Section 2 injunction and to liability for any damage on a strict-liability basis
  • Not logging or responding to occupant complaints — a single unanswered complaint is the most common trigger for a Section 80 abatement notice

Example Scenario

A demolition contractor in Hull is taking down a 1950s 4-storey concrete-frame office bounded on three sides by occupied Victorian terraces. Using Riskora, the demolition engineer selects the Demolition preset and adds the vibration hazard. The risk assessment classifies the terraces as unreinforced masonry (BS 7385-2 guide value halved to 7.5 mm/s PPV at 4 Hz), predicts hydraulic-breaker PPV at the nearest terrace foundation at 4.8 mm/s using BS 5228-2 Annex B with the contractor's 850 kg breaker on stiff clay, and sets trigger / action / stop at 3.75 / 5.6 / 7.5 mm/s. Triaxial monitors are placed at the foundations of two index properties with real-time alerts to the site manager. A Section 61 consent was agreed with Hull City Council EHO at the lower of those limits. Pre-condition dilapidation surveys were completed for all six adjacent properties. The 14-page risk assessment exports in 8 minutes, the demolition runs for six weeks with two trigger-level alerts (both leading to a switch from hydraulic breaker to munching for that section), no action or stop breaches, and no damage claims at handover.

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