In brief
- A survey firm's claim of experience is not evidence; the check is a closed level run you can re-run and compare.
- Ask for raw field booking sheets and the datum used, not a summary sheet with finished elevations.
- Tie stage payments to benchmarks you can verify on site, and check what your contract allows before holding money back.
Contents
Site level surveys competency risks in Berbera start with a simple gap: a firm can describe previous work and still not own or operate a level, a staff or a total station well enough for your plot. The claim sounds like evidence, so nobody tests it. The fix is to treat the survey as a measurable process and ask for the records that process leaves behind. A level run that closes well, with dated field notes and a stated benchmark, tells you more than any reference list.
What does a claim of survey experience actually prove?
It proves almost nothing on its own, because talk is cheap and records are not.
Ask to see the instrument, not a photograph of one. Ask who will hold the staff and who will book the readings, and whether the same team will return for the setting-out checks. Request the field booking sheets from one recent job, with the arithmetic visible and the loop closure shown. An unclosed run, a booking sheet with erased figures, or a single summary sheet with no raw readings behind it are gaps you can see before any work starts.
Walk a recent site the firm names and look at what was built. If finished floor levels sit visibly above or below the neighbouring plot, ask what benchmark was used. If the firm cannot name the datum, the town benchmark or the temporary benchmark it transferred from, the elevations have no anchor. Ask the municipal engineer's office what datum or control points, if any, it holds for the area, rather than assuming one exists.
How do weak level runs turn into wrong building elevations?
A small error at the start of a run grows with every setup, and the building pays for it.
General practice is that a level run should close back on its starting benchmark within the tolerance the project specification sets, and every booking should be checkable by arithmetic. If nobody checks the closure, a wrong benchmark, a misread staff or a mis-set tripod passes straight into the finished floor level. The result is visible later: a finished floor level set too low can leave door thresholds below the surrounding ground and prone to flooding in the wet season, floors that sit above or below the access road, or a slab that needs extra fill or a cut that nobody priced. Ask the project engineer about local rainfall before fixing finished floor levels.
Ask the team how they will protect and check the instrument on your site, because dust, heat and salt air can shorten the working window and slow the crew, which makes short cuts more tempting. The mechanism is not exotic: fewer setups, skipped check runs, or readings taken from the wrong staff graduation. Ask for the closure figure in writing and compare it with the tolerance named in the specification. Confirm that tolerance with the project engineer rather than treating any rule of thumb as a local regulation.
How do you test competency before you award the work?
Set one small, paid trial and watch the method, not the promises.
Give the firm a bounded task: transfer a level from a benchmark you agree together to two or three points on your plot, and hand you the booking sheet. Watch the setup, the staff handling and the recording. Then ask a second firm or your engineer to re-run the same transfer and compare the results. If two competent teams disagree beyond the stated tolerance, you have found a problem before concrete is poured.
Tie payment stages to deliverables you can verify: the benchmark record, the booking sheets and a signed setting-out check against the approved drawings. Check what your contract allows before you hold back any payment, and ask the engineer who signs off the levels to confirm the tolerance in writing. Add a written check of how the team will store and inspect the instrument between visits.
What to do next
Pick one benchmark on or near your plot, agree it in writing with the survey firm and your engineer, and commission a short paid trial run to two marked points. Ask for the booking sheet and closure figure the same day. Compare that result with a re-run by a second team before you award the full survey.
Frequently asked questions
Can I check a survey firm's levels myself without an instrument?
Not to survey accuracy. You can check the records instead: ask for the booking sheet, the datum and the closure figure, and walk a recent site to see whether finished levels match the road and neighbouring plots.
What should a level run hand over at the end?
Ask for the benchmark used, the raw booking sheets, the closure figure and a signed setting-out check against the approved drawings. Confirm the acceptable tolerance with your project engineer.
Local reporting: this article is written for building work in Berbera and Somaliland. Ground conditions, prices and rules differ between places; confirm the details for your own site.