Supervision is the item buyers assume is included and discover is not, usually on the morning the crew arrives and the foundations are 40 mm out.

Two things are confused under the same word. Installation is the physical work: excavation, anchor resin, frame assembly, glazing, terminations. Supervision is technical governance: setting out, method approval, hold points, commissioning witness, and a signature that the unit was erected as designed. A Chinese manufacturer will normally supply the second and will rarely supply the first, because the first is a local-labour, local-liability activity.

The commercial consequence sits in the warranty. A shelter that fails at an anchor because the installer used the wrong resin cartridge is a structural defect, and it will be argued as an installation defect unless the supervision record shows the hold point was inspected and signed. That record is what the buyer is actually purchasing.

What does "engineer supervision" include — and what does it exclude?

Supervision covers setting out, method statement review, hold-point inspection and commissioning witness, plus a signed installation report. It excludes labour, plant, crane hire, scaffolding, excavation, electrical connection to the mains, and any instruction that overrides your installer's contractual responsibility for their own work.

Level 4 is a different contract, not an upgrade of Level 2. Ask which one is being priced before comparing quotations, because a Level 4 price and a Level 0 price differ by more than the shelter itself in labour markets such as Australia, the Gulf or northern Europe.

The engineer's authority also needs defining. In most Chinese OEM arrangements the supervisor advises and witnesses; he does not direct your labour, cannot dismiss a worker, and does not become the site's health-and-safety controller. Write that down. A supervisor who is assumed to be in charge of the site is a supervisor whose employer is assumed to be liable for the site.

What must be fixed before the supervisor can be mobilised?

Six items must be closed before a visit is booked: approved drawings, surveyed foundation as-builts, confirmed access and lifting plan, a named local crew with its own insurance, the visa and work-permit route, and a signed supervision scope with dates. Any one of these missing turns a five-day visit into a fourteen-day standby claim.

An important sequencing point for publicly funded programmes: the engineer's visit should be scheduled after drawing pre-approval, not before. Buyers regularly book supervision to "get started" while the structural approval is still in review, then pay for a second mobilisation when the approved drawing lands.

【YEROO DATA NEEDED: standard supervision levels offered (documentation / remote / first-unit / campaign), engineer day rate, mobilisation and demobilisation charges, and whether the first unit's supervision is included in the unit price or quoted separately】

Who is legally responsible when a supervised installation fails?

Your installer remains responsible for the work they performed; the supplier remains responsible for design, materials and the correctness of the instructions. Supervision transfers knowledge, not liability. The exception is where the supervisor gives a written instruction that contradicts the approved method — that instruction becomes the supplier's risk.

This allocation has to appear in the contract as a clause, because it will otherwise be reconstructed after the failure by two insurers with opposite interests.

Get the insurance certificates before the engineer boards, not after. A supervisory visit by an uninsured technician on a European site is a risk most framework agreements prohibit outright.

What evidence of competence should the tender demand?

Demand five documents: the named engineer's CV with project list, his welding inspection qualification, his electrical authorisation for the voltage present, his working-at-height certification where relevant, and evidence that the supplier's factory holds a current ISO 9001 certificate with the scope wording that covers shelter manufacture.

A supplier who sends a sales manager with a camera is not providing supervision. The CV test is the fastest filter available: if the named engineer has never commissioned a powered shelter, the visit is a courtesy call with a day rate attached.

Which parts of the work can be supervised remotely, and when is attendance unavoidable?

Remote supervision works for standard structures erected by an experienced crew with a photographic hold-point record. Attendance is unavoidable for the first unit of a model in a new country, for any site-welded structural connection, for energisation of a powered or digital unit, and for any hold point that releases a payment.

Four conditional rules resolve most debates. If the crew has never installed this model, buy attendance for the first unit regardless of the model's simplicity. If the unit includes a lithium battery, add attendance at first energisation and require the UN 38.3 test summary on site. If the foundations are cast by others and not surveyed, buy a setting-out visit before casting rather than a correction visit after. If the contract has milestone payments, put the supervisor's signature on the milestone certificate so the payment and the evidence are the same document.

What does supervision cost, and how does it compare with the rework it prevents?

Indicative global ranges put a manufacturer's technician on site at USD 250–450 per day, plus mobilisation of USD 1,200–3,500 per trip for flights, visa, insurance and accommodation, before any stand-by charge. A five-day first-unit visit therefore costs less than one re-glazed bay or one re-galvanised post.

These are indicative ranges for budgeting, not YEROO rates, and they move with the destination: a visit to Romania costs a fraction of a visit to Guam.

The comparison is not day rate against day rate. It is one visit against the cost of discovering, eight months later, that the drainage falls the wrong way and the glazing bays have been set to a 12 mm gap instead of 8 mm, so every panel rattles in wind and the fix is every panel.

How should the supervision scope be written into the tender?

Write it as a priced line item with a named level, named days, named hold points and named deliverables — never as "installation support as required". An unpriced, undefined support obligation is scored as zero because it cannot be evaluated or enforced.

Score the supervision package out of 100 with a 70 pass mark: named personnel and qualifications (30), defined hold points and deliverables (25), price transparency including standby and extension (20), warranty linkage and record format (15), insurance and immigration handling (10). Fail the bid outright if the engineer is unnamed, because an unnamed resource cannot be committed and cannot be replaced on a programme.

What does the wrong supervision arrangement cost?

The expensive errors are not the day rate. They are the visit that happened too early, the visit that was never booked because the quotation said "installation guide included", and the report that was never signed so the warranty argument had no evidence on either side.

One pattern repeats across projects. The buyer who books supervision for the first unit and the commissioning, and nothing in between, spends the least and carries the least risk, because those are the two moments where a decision cannot be reversed cheaply.

Common questions from buyers

Is installation supervision included in the shelter price?Usually not, unless the quotation says so. Most OEM quotations include documentation and remote support; attendance is a separate line. Ask for the level, the days and the mobilisation cost in writing before comparing unit prices.

Can the supplier install the shelters instead of supervising?Yes, in some markets, as a turnkey scope with its own crew or a subcontractor under its liability. That is a different contract with a different price, and it is only available where local labour, licensing and insurance can be arranged.

Who pays for the engineer's flights, visa and hotel?The buyer, normally, either as a stated mobilisation charge or inside the day rate. What matters is that the basis is written down, including who pays for a rescheduled trip caused by a site delay.

Does supervision affect the warranty?Yes. Warranties are commonly conditional on installation following the approved method statement, and the supervision report is the evidence. Without it, a failed anchor becomes a dispute about workmanship with no record.

How many days should we budget for a first-unit visit?Six working days for a standard 6 m shelter, eight to ten for a powered or digital unit with CMS commissioning, and two extra days if the foundation is being set out rather than verified. Add travel days separately.

Can we supervise remotely to save cost?For repeat models with an experienced crew, yes, with photographic hold points and a countersigned checklist. For the first unit in a country, any site weld, or energisation of a powered unit, attendance is cheaper than the diagnosis.

Supervision is a scope, and scopes are either specified or invented after the failure. Fix the level, name the engineer, define the hold points, price the mobilisation and the standby rate, and tie the warranty to the signed report. Then the visit is an inspection with a record rather than a technician watching a crew guess.

YEROO supplies shelters with documentation, remote support and first-unit attendance, and can quote supervision as a line item against your programme rather than folding it into the unit rate. Send your model count, site locations and required on-site dates through the contact page, and review the bus shelter range the method statements are written against. Buyers preparing the package usually work from the specification checklist and the installation sequence guide, then confirm factory capability with the factory verification checklist. For a programme where wind and cold set the fixing schedule, the Iceland stainless steel transit hub shows how supervision and hold points were sequenced on a live installation.