A structural audit tells you whether a building is safe, what is wrong with it and how serious it is. You get it done when something looks wrong (cracks, sagging, leaks, rusted steel showing) or before a big decision such as buying an old house, adding a floor or changing a house into offices.
What's included
| Stage | What the engineer does |
|---|---|
| Document review | Looks at approved maps and structural drawings, if you have them |
| Visual inspection | Walks every floor, roof and basement; maps cracks, dampness, rust stains, sagging and settlement |
| Measurement | Records sizes of columns, beams and slabs where drawings are missing |
| Non-destructive tests | Where needed: rebound hammer for concrete surface hardness, rebar scanning to find steel, ultrasonic tests |
| Sampling tests | Where needed: concrete cores taken to a lab for strength |
| Analysis | Checks whether the structure can carry its current or planned loads |
| Report | Findings, photos, severity, recommended repairs and urgency |
The engineer decides which tests are needed. Not every audit needs cores.
When you need it
- Diagonal cracks near doors and windows, or cracks that keep growing.
- Slabs or beams visibly sagging, or plaster falling from the ceiling.
- Rust stains or exposed steel in slabs and columns, often under bathrooms and roofs.
- Floors sinking or doors that no longer close.
- Before buying a house older than you are comfortable with.
- Before adding a floor, a water tank or heavy equipment on the roof.
- Before changing use, for example from house to school, clinic or office.
- After a fire, flood or earthquake.
Step-by-step process
- Describe the problem in your request, with photos, building age, floors and any drawings.
- Agree scope in writing: areas to inspect, tests included, report format and timeline.
- Site inspection. The engineer may need access to every room, the roof and any basement.
- Testing. If tests are needed, they are arranged and the spots repaired after.
- Analysis of results against the building's loads.
- Report with findings and recommendations.
- Next step. If repair is needed, the same engineer or another can design the retrofitting.
Approvals and documents
An audit itself usually needs no approval. It helps to have:
- The approved building plan from LDA, DHA or your society.
- Any structural drawings from the original builder.
- Records of past repairs.
If the report recommends an extra floor or major structural changes, you may need an addition/alteration approval. The LDA regulations we reviewed treat any structural change after plan approval as an addition/alteration needing a separate plan.
What affects the cost
There is no published standard fee, so get written quotes. Key factors:
- Building size and number of floors.
- Whether drawings exist or everything must be measured.
- Number and type of tests (cores cost more than visual checks).
- Access difficulty: occupied rooms, high facades, tight roofs.
- Report depth: a short letter or a full report with analysis.
- Urgency.
Questions to ask the engineer
- What is your PEC registration number?
- Which tests do you think are needed, and why?
- Will the report say clearly whether the building is safe to use?
- Will you recommend specific repairs, or only describe problems?
- How long will the report take?
- Do you also design the repair work?
Red flags
- An "audit" done in a few minutes from the street.
- A report with no photos or locations of defects.
- A contractor offering a free audit that always ends in a large repair job.
- Tests ordered with no explanation of what they will show.
- A report that avoids a clear safety opinion.
FAQs
Are all cracks dangerous? No. Fine plaster cracks are common. Wide, diagonal, growing or stepped cracks, and cracks in beams or columns, need an engineer's look.
Can an audit tell if I can add a floor? An audit is often the first step. A full additional floor feasibility check then calculates whether foundations and columns can take the extra load.
Do tests damage the building? Non-destructive tests do not. Cores leave small holes that are patched afterwards.
Should I get an audit before buying an old house? It is a sensible step if the house shows cracks, dampness or past repairs, or if you plan major changes.
This page is general information; confirm with the relevant authority or a qualified professional before you act.
Sources
- LDA Building and Zoning Regulations 2019 (amended), PDF copy reviewed: https://khalidzafar.com/wp-content/files_mf/1685711737LDAAmendedBuildingRegulations2019.pdf