How to Choose a Data Centre Cabling Subcontractor: 9 Questions

Most guides to choosing a subcontractor are written by people selling something, which is why they all recommend whatever the author happens to be. This one is written from the supply side and includes the questions that are inconvenient for us to answer. If a supplier flinches at any of the nine below, that is the useful information.

1. Have these people worked together before?

A crew of four who know each other’s pace installs faster than four strangers with identical tickets. Ask directly whether the team proposed is a team or a list assembled this week. Most labour suppliers hold a database rather than a bench, and the first week of the job is spent discovering which of the four can actually terminate.

2. When does the compliance pack reach me?

There are only two answers: before anyone travels, or after. The industry standard is after — the crew mobilises and the documents get chased behind them. That works until one man is turned away at the gate, at which point the cost is not one man’s day, it is the whole crew’s momentum.

Ask for the pack to be a condition of mobilisation, in writing, and see how the answer changes.

3. Who verifies that a permit allows this specific work?

This is the question almost nobody asks, and it is where European deployments actually break. A residence permit is not a work permit, and the mentions printed on it decide what the holder may legally do — employed work, self-employed work, or neither. Two permits that look identical on a scan can carry entirely different rights.

A supplier who collects documents will tell you every man has a permit. A supplier who reads them will tell you which ones cannot do the job you are offering.

4. What happens if someone underperforms?

“We will find a replacement” means a new search and a new delay, with your programme waiting through both. “We replace from our own bench” means somebody else starts on Monday. The difference only shows up when you need it, which is why it belongs in the conversation before you need it.

5. Is the rate one number, and is it in writing before travel?

Ask what the rate covers and what appears separately. Then ask for it in writing before anyone books a flight. The suppliers who resist this are telling you something about how the invoice will look.

• Does it include supervision, or is that extra?
• Are travel and accommodation inside the rate or quoted openly alongside it?
• What triggers overtime, and does it need your written instruction?
• Is there an introduction fee, or a transfer fee if you later engage someone directly?

6. Who answers the phone at six in the morning?

On the day a man does not turn up, you do not want an account manager who will “look into it”. You want the person who knows that man’s number. Ask for a named coordinator for the life of the project and ask whether they are reachable outside office hours. Large suppliers will hesitate, because at scale they genuinely cannot promise it.

7. Can the crew certify, or only install?

Anyone can pull cable. Far fewer can test to specification and produce a results pack that survives a client audit — OTDR traces, insertion loss, reflectance, labelling that matches the drawings. On most programmes, handover slips because of the paperwork behind the installation rather than the installation itself.

8. Who carries the insurance and the contract?

Every operative should be engaged under a written contract and covered by employer’s liability and public liability insurance, with terms that mirror yours. If a supplier is vague here, the exposure does not disappear — it simply moves to you.

9. Will you approach my client?

If you are an agency or a main contractor bringing in a subcontractor, this is the question that matters most and gets asked least. The answer should be in the supply agreement rather than in a reassuring sentence on a call, because a term is enforceable and a sentence is not.

The short version

A good subcontractor answers all nine without needing to check. A poor one answers the first two well and starts hedging around the third. You will learn more from the hesitation than from the brochure.

If you have a live requirement and want these nine answered about us specifically, the fastest route is to send the trade, the location and the dates to gotodataworks3@gmail.com or call +44 7934 524074. You will have rates and availability back the same working day — including no, when the answer is no.