Before a factory has its first drawing, two activities already happen on the site and both can cause disputes with neighbours: geotechnical drilling for foundation design data, and trial or mass pile pressing during foundation works. Vibration and soil displacement from pile pressing are the classic cause of settlement and cracking in surrounding homes, and in this dispute type the party holding a pre-pressing condition record of neighbouring houses almost always holds the evidence advantage.
Permit or notification only
Construction surveying including geotechnical drilling is preparatory work in the project preparation stage, performed under the survey task approved by the investor and the rules on managing construction survey work; it needs no construction permit because it is not yet construction of a work, but the investor must ensure the survey unit is qualified, notify local authorities and surrounding households of the drilling time and scope, and bear safety, hygiene and site restoration duties after the survey.
Trial pile pressing for testing and design also belongs to preparatory and testing work; while mass pile pressing is part of foundation construction within the work construction permit and must sit inside the approved construction method, with the prescribed commencement notice. The practical boundary should be confirmed in writing with the permitting authority or the park management board where the project sits, especially when trial piles are large and near homes, because some localities require notice and approval of neighbouring-work safety measures before pressing.
Compensation liability for neighbouring settlement and cracks
On civil principles, a construction organisation causing damage to others property by vibration and soil displacement must compensate the full actual loss under the Civil Code No. 91/2015/QH13, including repair and reinforcement costs for settled and cracked houses, temporary housing rent during repairs, and proven related property losses. Article 605 of the Civil Code on compensation for damage caused by houses and construction works reinforces the liability of owners, managers and users of works where the work harms surroundings.
Liability between the investor and the contractor is allocated by the construction contract and the approved construction method: the contractor directly causing damage during pressing answers first; the investor bears related responsibility as project owner and is usually the party dealing with residents, then recovering from the contractor under the contract. Damage levels are set by independent construction expert assessment of crack causes, structural impact and repair unit prices, not by the parties verbal demands.
Condition records and choosing the pressing method
Before pressing, the investor and contractor should invite local authorities or an independent assessment unit together with neighbouring households to inspect, film and record the condition of each house within the impact radius: existing cracks, tilt, foundation state, with time-stamped photos and party signatures. This record is the evidence separating old cracks from new ones when complaints arise, and its cost is trivial against a prolonged settlement dispute that can stall the entire foundation schedule.
Technically, static hydraulic pressing causes far less vibration and displacement than diesel hammer driving; pre-drilling before pressing reduces soil heave in soft clay; bored piles are the least disturbing option but cost significantly more. Method choice should rest on the distance to the nearest homes, geological conditions and a total cost analysis including compensation risk, rather than only the unit price per metre of pile.
Frequently Asked Questions
Do trial piling and geotechnical drilling need a permit or only notification?
Geotechnical drilling and trial piles are preparatory and testing work in the project preparation stage, so no construction permit is needed, but local authorities and surrounding households must be notified, with safety ensured and the site restored. Mass pile pressing is foundation construction inside the construction permit and the commencement notice. Large trial piles near homes should be confirmed in writing with the permitting authority.
If piling cracks a neighbouring house, who compensates and how is it calculated?
The construction party causing the damage compensates the full actual loss under the 2015 Civil Code, with Article 605 reinforcing work-owner liability; allocation between investor and contractor follows the construction contract, the pressing contractor answering first and the investor recovering afterwards. The amount is set by independent construction expert assessment of causes and repair costs, not verbal demands.
Should a condition record of surrounding houses be made before piling?
Absolutely, and it is the single most important self-protection step: inspect, film and record each house within the impact radius together with local authorities or an assessment unit and the households, noting existing cracks with time-stamped photos. When settlement complaints arise, this record separates old cracks from new ones and decides most of the dispute outcome.
Which piling method disturbs least, and what is the cost difference?
Static hydraulic pressing vibrates clearly less than diesel hammer driving; pre-drilling reduces soil heave in soft ground; bored piles disturb least but cost markedly more than pressed piles. The difference must be computed on total cost including compensation risk and dispute-driven delay, not only the unit price per metre of pile.
This article has been quality-reviewed by the FLAW AI Legal Council