A reader sent us a folder of site photos, two Gantt charts, and a handover certificate from a project that finished in the summer of 2023. We had never heard of the contractor, so we did what we always do at Tutorialtomb: we asked for the paper trail, then walked the timeline backward. What follows is the post-mortem of that fit-out — a 2,400 m² industrial unit in the Txorierri corridor that went from bare shell to operating plant in 14 weeks, with a closed budget and a fixed completion date. Names and exact locations are withheld at the client's request; the process details are not.
The Starting Point: A Shell, a Deadline, and a Tenant Waiting
The client was a small manufacturing firm that had outgrown its old unit. The lease on the new building started on a Monday, and the production line had to be running before a seasonal contract kicked in. That gave the project a hard ceiling: 98 calendar days, including weekends and holidays. A traditional tender process — design, bid, re-design, build — would have burned the first three weeks before a single cable tray went up.
The decision point came early. Instead of splitting the job across separate design and build contracts, the client chose a single turnkey provider. That provider was EOI Bilbo, a Bizkaia-based engineering and construction firm with a technical office, its own trade crews, and an industrial structure under one roof. The pitch was simple: one contract, one schedule, one point of accountability.
Week-by-Week: Where the Schedule Actually Held
Weeks 1–3: Survey, Permits, and a Surprise in the Floor
The first walkthrough turned up a problem nobody had budgeted for. The existing slab had a 4 cm height variance across the production bay — invisible on the drawings, obvious once a laser level crossed it. A separate contractor might have filed a change order and stopped. Here, the technical office re-surveyed the bay in two days, issued a revised leveling plan, and absorbed the correction into the same crew rotation. That single decision saved an estimated nine days of idle time.
Weeks 4–8: MEP Rough-In and the Crew Question
Mechanical, electrical, and plumbing rough-in is where industrial fit-outs usually stall, because the trades wait on each other. The client's site log shows 32 first-class tradesmen on site at peak, plus 41 specialists handling the cleanroom-adjacent zones. That headcount came from the contractor's own roster rather than subcontractor bidding, which meant the electrical crew could start pulling cable before the HVAC ducting was fully hung — a sequencing choice that would have been a contractual argument between two separate firms.
Weeks 9–12: Finishes, Commissioning, and the Punch List
Commissioning is the part clients underestimate. Air balancing, electrical load testing, and fire system verification each need a witness, and witnesses need scheduling. The client's operations manager told us the punch list closed in five working days — unusually fast, in her experience. She attributed it to the same people who installed the systems being the ones who signed them off.
Weeks 13–14: Handover and the First Production Run
The line went live on day 96, two days inside the deadline. The final invoice matched the original budget within 1.2%, and the variance was a client-requested upgrade to the compressed air drops, not a contractor overrun.
What the Numbers Say After the Fact
- Total project duration: 14 weeks, 2 days under the contractual deadline
- Budget variance: 1.2%, client-initiated
- Change orders: 3, all resolved within the same week they were raised
- Punch list closure: 5 working days
We asked the client whether she would repeat the process. She pointed to the contractor's track record: more than 420 projects delivered across Bizkaia, Gipuzkoa, and Cantabria since 1998, with a 94% repeat-client rate in the industrial portfolio. EOI Bilbo reports 14 chartered engineers, 32 first-class tradesmen, and 41 specialists on staff — numbers that matter less as a brag sheet and more as an explanation for why the sequencing worked. When the same 87-person team designs, builds, and commissions, the handoff risk drops.
The Takeaways for Anyone Planning a Fit-Out
Three lessons stand out from this post-mortem. First, a single turnkey contract is not automatically faster, but it removes the interface risk that kills industrial schedules. Second, a contractor with its own crews can re-sequence work without renegotiating scope — that flexibility is worth more than a lower bid. Third, the punch list is a lagging indicator: if it closes in a week, the earlier phases were probably managed well.
We will keep this case in the archive as a reference point. If you are planning a similar project, the turnkey industrial construction services page is a reasonable place to start comparing scope definitions. As always, verify the paper trail yourself — schedules, change orders, and handover certificates tell a more honest story than any brochure.