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If excavation, piling, compaction or dewatering starts next door, create a dated baseline immediately and document every later change against it. Photograph defects in context and close-up, map each one to a room or elevation, preserve project records, and notify the project contact in writing. That evidence can support a professional comparison, but photographs alone cannot prove what caused a crack or who is legally responsible.
The most reliable record combines an agreed pre-work condition survey (where local rules or project arrangements provide one), your own unaltered photographs and notes, a chronology of construction activity, and a qualified professional’s assessment when movement progresses or safety is uncertain.
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Why a baseline matters before excavation starts
Nearby ground-disturbing work can make an existing defect look new, or a small defect appear to worsen when viewed from a different angle. A baseline fixes the condition of the property at a known date so later observations can be compared with the same locations and views.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsVictoria’s Building and Plumbing Commission guidance on protection work says an adjoining-property survey should record existing cracks and defects and be signed or acknowledged as an agreed condition record before protection work begins. That requirement belongs to Victoria’s legal framework; it is not a universal rule. In other locations, the project may offer a survey voluntarily, local law may set a process, or the owner may need to commission an independent survey.
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Dumfries and Galloway Council describes local building-condition surveys as records of the baseline that may be followed by inspections after construction. The extent and frequency can vary with distance from the work and the construction activity. This is an example of project practice, not a rule for every excavation.
Ask for the project’s survey before work
Contact the developer, contractor, local authority or named project representative before excavation begins. Ask:
- Whether a pre-construction condition survey is planned.
- Who will conduct it and what qualifications they hold.
- Which exterior and interior areas will be inspected.
- Whether photographs, marked-up plans and a written report are included.
- How and when you will receive the report and image files.
- Whether the survey is intended to be an agreed condition record and how acknowledgement or signatures are handled.
- Who pays under the applicable local process.
Do not assume that a project survey covers every room, boundary or outbuilding, or that it automatically becomes an agreed record. Check its scope and retain your own copy.
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If no survey is offered, or the work is very close to the property, consider an independent building-condition survey before excavation, piling, heavy machinery or other ground-disturbing operations. Independence matters because the surveyor is not documenting only the contractor’s interests. Local rules may allocate responsibility and costs differently, so confirm those arrangements before appointing anyone.
Build a complete pre-work condition record
Inspect safely inside and outside
Walk through the property only where access is safe and permitted. Record existing conditions without assigning a cause you cannot establish. A useful survey can include visible walls, brickwork, roofs and chimneys, openings, paths, boundaries, internal walls, ceilings and floors. Note more than cracks: sticking doors or windows, water ingress, damaged finishes, distorted frames and prior repairs can all help a later professional understand what changed.
Create a defect index
Give every defect a permanent identifier and use it in your notes and file names. At minimum, record:
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- Property address.
- Date and time of the observation.
- Name of the person making the record.
- Room, elevation or external feature.
- Neutral description of the visible condition.
- Defect ID, such as “K-03” for the third kitchen item.
Describe what is visible rather than what you think caused it. “Diagonal crack from the upper-left corner of the window opening, approximately 0.8 mm at the widest visible point” is more useful than “excavation caused settlement.” If a measurement is approximate, label it as such.
Photograph each item in repeatable views
Take at least one context photograph showing the defect’s position in the room or elevation and one close-up showing its form. Where practical, include a measuring tape, ruler or other scale reference beside the defect. A scale helps compare images, but a photograph is not an engineering measurement.
Use the same camera orientation and distance for later photographs. Keep the original files unaltered; do not crop, enhance or overwrite them. If you create annotated copies, preserve the original beside the copy and label the annotation date. Back up the originals in a second location.
Record the surrounding condition
Capture adjacent finishes, corners, openings and levels that might help show whether a condition is isolated or part of a wider pattern. Photograph both sides of a wall or the corresponding exterior area when accessible and safe. Record water stains, repairs, sealant, paint or plaster that could hide an older defect. Do not remove finishes merely to improve the record.
Keep a chronology of construction and observed change
Evidence becomes more useful when it shows sequence. Keep project notices, access agreements, plans supplied to residents, inspection reports, emails, letters and dated photographs together. Note when excavation, piling, compaction, dewatering or other activity was observed, but distinguish what you personally saw from information supplied by someone else.
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Make follow-up observations when conditions change and compare them with the baseline views. Use a single chronological folder and a log such as this:
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| Field | What to enter |
|---|---|
| Defect ID | The permanent identifier used in every file and note |
| Location | Room, wall, elevation, opening or boundary feature |
| First observed | Date and time, and whether it was present in the baseline |
| Description | Visible form, direction, length and approximate width if measured |
| Images | Original file names for context and close-up views |
| Measurement or gauge | Reading, date and method; identify who took it |
| Nearby work observed | Activity and timing stated only as observed or verified |
| Follow-up | Notice sent, inspection requested, monitoring or repair record |
Use consistent filenames such as K-03_2026-10-17_context.jpg and K-03_2026-10-17_closeup.jpg. Keep the camera’s original metadata when available, but do not rely on metadata alone; write the date, time and location in the log.
What to do when damage appears during or after excavation
1. Make the first record before touching the defect
- Write down the date and time you first noticed the condition.
- Identify the exact location and visible form: for example, a new diagonal crack, displaced masonry, a sticking door, or water entering at a joint.
- Compare it with the baseline photographs and notes.
- Record any nearby activity that was occurring or had recently occurred, such as excavation, piling, compaction or dewatering. State only what you observed or can verify.
- Photograph the same context and close-up views used in the baseline, with a scale reference where appropriate.
2. Avoid destroying the evidence
Do not fill, paint over, plaster, seal or repair a defect before documenting it unless urgent safety or water-protection needs require immediate action. If emergency work is necessary, photograph the condition first where safe, describe what was done, and retain invoices, contractor notes and any removed material records you can preserve.
3. Notify the project contact in writing
Send a dated message to the contractor, developer, owner’s representative or other project contact identified in the project documents. Describe the observed condition and its location, attach a short list of the relevant defect IDs, and ask how and when it will be inspected and recorded. Keep the sent message, attachments and response in the chronology. Notification procedures and deadlines depend on local law, contracts and any protection-work process; a message to a site worker may not satisfy a formal notice requirement.
4. Monitor only with a defined method
A crack-monitor gauge can provide a simple record of change in crack width or relative movement. It does not diagnose the cause, establish that excavation produced the damage, or show that the structure is safe. Ask a qualified professional whether monitoring is appropriate, where the gauge should be installed, how often it should be read and how readings should be interpreted. Record every reading with its date, time, gauge location and environmental conditions that the professional says are relevant.
5. Request a professional inspection when the condition progresses
Arrange a qualified structural professional’s inspection when a crack is widening, new displacement or settlement is visible, doors or windows suddenly bind, water enters, several related defects appear, or you have a safety concern. A professional can decide whether a closer inspection, measurements, monitoring, analysis or further investigation is warranted. A visual record is valuable evidence, but it cannot substitute for that assessment.
Choose the right type of survey or assessment
“Condition survey” and “structural assessment” are not interchangeable. A visual condition survey documents what can be seen at a defined date. A structural assessment addresses a technical question about behavior, stability or required investigation and should state its assumptions and limits.
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| Option | Best use | Questions to confirm |
|---|---|---|
| Project-arranged condition survey | Creating a shared pre-work baseline where the project offers one | Who is independent, what areas are included, whether the record is signed or acknowledged, and how photographs are supplied |
| Independent building-condition survey | Documenting the property before work when no suitable project survey exists | Interior and exterior coverage, qualifications, photographs, annotated plans, measurements, exclusions, delivery date and fee |
| Structural engineering assessment | Investigating progressive movement, displacement, safety concerns or a disputed technical cause | Inspection scope, measurements or monitoring, analysis, deliverables, limitations, liability terms and professional indemnity insurance |
| Follow-up inspection or monitoring | Comparing the baseline with later conditions during or after construction | Intervals, repeatable locations, instruments, reading method, interpretation and escalation criteria |
When appointing an engineer or other building professional, define the question in writing. Ask whether the work is a visual survey or structural assessment, which areas will be inspected, what measurements or monitoring are included, what report and marked-up plans will be supplied, what is excluded, and what professional indemnity insurance is carried. UK Department for Education guidance on structural assessments and investigations emphasizes agreeing scope, limitations, liability terms and insurance before the appointment.
What a useful professional report should contain
A report should let another reader understand what was inspected and how the conclusions were reached. UK government guidance describes reports that make their scope and limitations clear. For a property-damage investigation, ask for:
- Inspection date, site conditions and areas inspected.
- The question the professional was asked to answer.
- Photographs identified by location and date.
- Marked-up sketches or plans showing defect positions.
- Observed facts separated from opinions about cause.
- Measurements, monitoring data or calculations used.
- Recommendations for further investigation, temporary measures or monitoring.
- Explicit exclusions and limitations, including areas that were inaccessible.
A report can identify patterns consistent with movement and recommend next steps without proving legal responsibility. Causation may require construction records, ground information, sequence and timing, previous defects, specialist testing and legal analysis. Preserve the report in its original form and keep any later commentary as a separately dated document.
How to describe possible causes without overclaiming
Use a neutral chronology: an existing crack was recorded on a particular date; excavation reached a particular stage; a later inspection found a changed condition. Avoid statements that convert timing into proof. “First observed after piling was reported on the site” accurately records sequence. “Piling caused the crack” is a technical conclusion that should come from a suitably qualified investigation, if the evidence supports it.
Include alternative explanations that a professional may need to consider, such as prior movement, moisture-related deterioration, thermal changes, settlement unrelated to the project, or an old repair opening again. You do not need to diagnose these possibilities; simply preserve facts that allow them to be assessed.
Jurisdiction-specific cautions
Victoria, Australia
The Building and Plumbing Commission Victoria guidance updated 30 June 2026 describes protection-work procedures in which an adjoining-property survey records existing cracks and defects and is signed or acknowledged as an agreed condition record before protection work begins. It also discusses insurance requirements for that process. Confirm the current Victorian process and any project-specific notices rather than applying it elsewhere.
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The Department of Transport’s “Chapter 1: General” Draft Standard Specification dated October 2020 calls for an inspection and, where the owner permits, a photographic survey before specified vibration- or impact-generating work near buildings. It describes written and photographic records of existing defects, discussion and written recording of preventive or mitigation measures, and signed and dated records. The document is expressly a draft standard from 2020; its vibration thresholds and procedures should not be treated as universal or current limits.
Scotland
Dumfries and Galloway Council’s 3 June 2026 explanation describes local project surveys, baseline records and possible follow-up inspections. Coverage can vary with distance and construction activity. Treat it as an example of council practice, not a rule for every Scottish or UK project.
British Columbia
The ATAC LAW article “Excavation Next Door in BC and the Right to Lateral Support” offers practical recordkeeping suggestions, including dated photographs and crack gauges, alongside BC-focused legal commentary. It is a legal-practice article rather than an official regulator or court source. Its legal conclusions should not be generalized to another province or country.
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When safety takes priority
Seek prompt advice if cracks widen, walls or floors visibly displace, settlement appears, doors or windows suddenly bind, water enters, or multiple related defects develop. If there is immediate danger—such as a collapsing element, severe instability, exposed services or rapidly worsening movement—leave the affected area and contact the appropriate emergency or building-safety authority. Documentation should never delay urgent protection of people.
Do not enter an excavation, climb unstable areas or cross a site boundary to obtain photographs. Photograph from a safe, permitted location and follow instructions from the site manager or authorities.
Quick Recap
Practical checklist
- Ask whether a pre-work survey exists, who prepared it and how to obtain the complete report and photographs.
- Confirm the survey’s interior, exterior and boundary coverage and whether it is an agreed condition record.
- Make your own dated defect index with permanent IDs.
- Photograph every defect in context and close-up, using a scale reference where useful.
- Preserve unaltered originals and back them up.
- Keep notices, plans, access agreements, emails, reports and site observations in date order.
- Repeat the same views when a condition changes.
- Record excavation, piling, compaction or dewatering only as observed or verified.
- Notify the project contact in writing and retain the response.
- Do not repair or conceal a defect before documenting it unless urgent safety or water protection requires action.
- Ask a qualified professional about monitoring when movement is progressive.
- Agree the professional’s scope, exclusions, deliverables, liability terms and insurance before appointment.
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