Raslak Works
Data centres · Articles · Uusimaa, Finland

What a data centre subcontractor must deliver: safety, credentials, documentation

Nobody walks onto a data centre site. Before the first working day there is a stack of documents, an induction and a set of site rules stricter than on most construction sites. Here is what the main contractor expects — and what is worth having in order before you even quote.

Published 2026-09-05 · Raslak Works · Suomeksi

Contractor's liability and company records

Finland's Contractor's Liability Act obliges the client to check a subcontractor's tax debts, pension insurance, collective agreement and registrations. An international main contractor does this carefully, often through a third-party service. The easiest route is membership of Vastuu Group's Reliable Partner programme, which keeps the records available to the client, up to date, for the whole contract period. Raslak Works is in the programme, and the records go out with every quote without being asked for.

Worker ID cards and tax numbers

Everyone working on a Finnish construction site must carry a photo ID — in practice a Valtti card — showing their tax number. An occupational safety card is also required, and usually a hot work card for anyone doing hot work. Every worker is registered on the site's personnel list in advance, and access is activated only after induction. Cards are checked at the gate every day.

Induction and site rules

A data centre induction is typically longer and more detailed than on an ordinary site. It covers routes, restricted areas, working near live equipment, dust control, hot work, lifting and emergencies. Many sites also run their own electronic reporting for observations and near misses. Inductions are often held in English, so workers' language skills need to be confirmed.

Access control and confidentiality

A data centre has areas that only a named person may enter at a named time. Tools and materials may be checked in and out, and photography is usually prohibited except at agreed points. This directly shapes how work is planned: materials arrive in precise batches, and the day's tasks are agreed in advance so nobody waits at the gate.

Documentation during the work

The biggest single difference from an ordinary site is the amount of documentation. Every fire stop is labelled and photographed, partition build-ups and materials are recorded, and changes to the design are approved in writing. The main contractor wants to see progress daily. Raslak Works handles this through its client portal: photos, checklists and hours are logged on site by phone, and site management sees them the same day without separate reports.

Quality and cleanliness

In a data centre, dust is the enemy, because it ends up in the equipment. Work areas are sealed off, tools are fitted with extraction and cleaning is done daily. Finishes have to be consistent, because rooms are inspected closely before equipment goes in. A clean site is not good manners in a data centre — it is a contract condition.

What this means for the quote

When these things are in order at quotation stage, work can start quickly: on small targeted packages Raslak Works can typically mobilise with one to two weeks' notice. The quote includes the liability records, workers' credentials and a description of how the work will be documented. That saves the client a string of emails and shows the subcontractor knows what is coming.

Frequently asked questions

Which cards do workers need?
A photo Valtti card with tax number and an occupational safety card for everyone; a hot work card for anyone doing hot work. The site may additionally require its own induction card.
What is Reliable Partner?
A Vastuu Group service that gathers the records required by the Contractor's Liability Act into one report the client can retrieve up to date. Raslak Works is a member.
Is photography allowed on a data centre site?
Usually only at agreed points and for an agreed purpose, such as documenting the work. Practices are set out in the induction and followed strictly.
How quickly can you start?
On small targeted packages typically with one to two weeks' notice, because documents and credentials are ready.

Tell us the site and the scope — you get an itemised quote and a firm schedule.

Request a free assessment

Read next: Data centre construction in Finland: phases · Interior fit-out for data centres · Data centre services