Written by The Bluum Team

Office Fit-Out in Occupied Buildings: What You Need to Know.

Written by The Bluum Team
Keep the business moving. Get the work done. That's what we do.

Picture your office on a Monday morning. Emails, meetings, someone burning toast in the kitchen. Now picture a construction team arriving at 7am to build a new wall three desks away.

That's an occupied building commercial fit-out. And at Bluum, it's not the exception. It's almost everything we do.

"It's probably worth saying that in reality, almost every project we do is in an occupied building. There's always a tenant below and a tenant above."
- Dan, Co-founder
Office Fit-Out in Occupied Buildings: What You Need to Know. Office Fit-Out in Occupied Buildings: What You Need to Know.

There’s No Such Thing as an Empty Building

 

Most people picture an office fit-out happening on a cleared, empty floor. In reality, there’s nearly always someone else in the building. A tenant on the floor below. A business next door. People in the corridor. Our team needs to work within someone else’s working day, not just show up and get on with it.

 

Planning and People: The Two Things That Matter Most

 

On a standard fit-out, the client cares about two dates: start and finish. On an occupied office fit-out, the programme needs to wrap around everything in between. Meeting schedules, desk relocations, room bookings. If we’re relocating desks over a weekend, staff need to have packed their personal effects before we arrive. These things seem small. They’re not.

The key to making it work is communication, and that starts with who you put on site.

"On occupied projects, the site manager's people skills are as important as their technical skills. Their job is to keep tenants informed, reassured and able to get on with their day."

Dan Keith, Co-founder

The Job We Always Talk About

 

When clients ask how we handle commercial fit-outs in occupied buildings, we always come back to the University of Westminster Faith Space we did in 2024.

We were building new prayer rooms in a basement area, which involved heavy structural work to create large penetrations in structural concrete walls for ductwork to pass through. Noisy, unavoidable stuff. The problem? We were on site during exam season.

The margin for error was zero. Any noise at the wrong moment could disrupt a student’s final exam. Every hour was mapped. Every phase of noisy work scheduled around the exam timetable.

We got it done. Nobody’s exam was disrupted. It looked straightforward from the outside. It wasn’t.

 

What Clients Almost Always Underestimate

 

Three things catch clients out time and again:

  • Space. They think they’ve cleared enough room. They haven’t. Twelve inches to squeeze through isn’t a workable site.
  • Noise. Screwing plasterboard into a metal stud is unremarkable to us. To someone trying to take a call two desks over, it isn’t.
  • Their own people. Different people have different tolerances for work happening around them. These days, almost all the paint we use is water-based and non-toxic, yet we’ve still had staff complain about smells and fumes. It’s worth preparing your team for what to expect before work begins.

Dust is managed with sealed sheeting around the work area. Noisy work is scheduled for early mornings or Saturdays, before most office staff arrive. Anyone needing to enter the build zone gets a full site induction and PPE. Nobody just wanders through.

 

Don’t Just Go for the Cheapest Quote

 

If you’re getting quotes for an office fit-out in London while staying in occupation, read the small print carefully. The cheapest quote frequently assumes uninterrupted access. It assumes the floor will be empty. It won’t account for the extra management, phasing, or scheduling around your business.

“Don’t necessarily go for the cheapest quote. They might just assume everyone’s going to leave the building, and they’ll get on uninterrupted. Read the small print. We always take into account the need for working around people if that is likely to be the case and if not we always state: we’ve assumed uninterrupted access to the space.” – Dan, Co-founder

Find a partner who asks how your building actually works before they price the job. A phased approach may cost a little more. But it’ll get done, without stopping your business in its tracks.

Thinking about an office fit-out while your team stays put? Let’s talk. We’ve done this hundreds of times.

 

 

Your Questions Answered

 

Can you refurbish an office without moving out?

Yes, and it’s more common than you’d think. Most commercial fit-outs take place in buildings that remain occupied throughout. The key is phasing the work carefully around your business, keeping communication open, and choosing a fit-out partner with genuine experience of managing live environments.

 

How disruptive is an office fit-out in an occupied building?

There will be some disruption, but a well-run project minimises the impact significantly. Noisy work gets scheduled for early mornings or weekends, dust is contained, and a good site manager will keep your team informed every step of the way.

 

Do I need to tell my staff before the fit-out starts?

Absolutely. Brief your team on the timeline, what to expect each week, and who to contact if they have concerns. Your fit-out partner should help you do this.

 

How do I choose the right fit-out company for an occupied building?

Look for evidence of completed projects in occupied spaces, not just empty floors. Ask how they manage noise and dust, how their site managers communicate with building occupants, and how they will phase the work around your business. A company that’s done this before will have clear, confident answers.