A commercial build-out rarely runs late because an electrician was slow on the day. It runs late because something in the building was not what the plan assumed, and nobody found out until the walls were open, the equipment was on the truck, or the inspector was standing in the room.
Every problem below is findable early. The cost of each one depends almost entirely on when it is found.
Problem 1: The building does not have the power you need
The space looked right. The previous tenant was an office, or a retail shop, or nothing at all. Your business is a restaurant, a fitness studio, a salon, a light-manufacturing shop or a medical office — and the equipment list draws far more than the space was built for.
This is the most common way an opening slips by months rather than weeks, for one reason: the utility sets the date, not the contractor. If the existing service cannot carry the new load, the fix is a service upgrade, and a service upgrade involves the utility’s engineering review, possibly a new transformer, and a scheduled disconnect and reconnect. Those steps run on the utility’s calendar, and that calendar is not built around your lease.
It gets more complicated in a multi-tenant building, where your space is fed from a shared service and the capacity left over belongs to the landlord, not to you.
What catches it early:
- An equipment list with real nameplate data — voltage, phase, amperage — for every major piece of equipment, before the lease is signed if at all possible.
- A load calculation against the existing service, done by someone who has seen the panel, not estimated from the square footage.
- A clear answer from the landlord about what capacity your suite actually has, in writing.
Before you sign: ask what the electrical service to the suite is, in amps, volts and phase. If nobody can answer, that is the first thing to find out, not the last.
Problem 2: The equipment does not match the power
Even when the building has enough power, it may not have the right kind.
Commercial buildings are commonly served at 208 volts three-phase, at 480 volts three-phase, or — in smaller and older buildings — at 240 volts single-phase. Equipment is built for one of these. A unit ordered for 240 volts runs poorly or not at all on 208. A three-phase machine does not run on single-phase power without a converter. A piece of kitchen equipment can arrive with a plug configuration nobody installed a receptacle for.
None of this is visible on a showroom floor or a spec sheet skimmed during a purchase. It shows up on install day, when the equipment is on site, the crew is ready, and the voltage at the wall is wrong.
The fix is cheap if it happens before the order: tell the supplier the building’s voltage and phase, and have the electrician review the cut sheets. After delivery, the options are a transformer, a return and reorder, or a different piece of equipment — and each of those costs both money and weeks.
The same goes for the trades around you. HVAC units, kitchen hoods, walk-in coolers and signage all need power, and each is often specified by a different party. One coordinated equipment schedule, reviewed against the electrical plan, prevents most of it.
Problem 3: Long-lead electrical gear
Some electrical equipment is ordered and then waited for. Switchboards, larger distribution panels, transformers, meter equipment and some lighting control systems can take weeks to months to arrive, and lead times move with the market.
The problem is not the wait itself. It is that the wait often starts late — after the drawings are final, after the permit is in hand, after someone notices the gear has not been ordered. On a tight schedule, that is the difference between opening on the planned date and opening a season later.
What helps:
- Identify long-lead items at the bid, not after award. A contractor who prices from the drawings should be able to tell you which pieces of gear will set the schedule.
- Release those orders early, even ahead of the rest of the work, once the design is settled enough to commit.
- Consider alternates. A different manufacturer, a different configuration, or a slightly different design can sometimes cut weeks without changing anything you would notice.
This is one of the places where design-build earns its keep: the electrical design gets made with the procurement schedule in view, instead of handed over to it.
Problem 4: What the previous tenant left behind
Second-generation space is cheaper and faster to open in — in theory. In practice, every previous tenant leaves something in the ceiling and the walls, and not all of it was permitted.
Common finds on a tenant improvement:
- Abandoned wiring and cabling. Old data cable, alarm wiring and disconnected circuits left above the ceiling. Accessible abandoned cable generally has to be removed, and in a large space that is days of work nobody budgeted.
- Unpermitted alterations. Circuits added by a handyman, receptacles extended with the wrong materials, a sub-panel nobody can account for. The inspector looking at your permit may well look at them too.
- Panel schedules that do not match reality. A panel labeled from three tenants ago means every circuit has to be traced before anything can be safely changed.
- Outdated or failing equipment. Old panels, damaged breakers or equipment with known problems that should not be extended, only replaced.
None of this is visible during a walkthrough with the ceiling tiles in place. It becomes visible during demolition — which is the expensive moment to discover it.
The fix is a pre-lease or pre-design site survey: lift some tiles, open the panels, trace a sample of circuits, and document what is there. A few hours of looking can change the lease negotiation, the budget, or both. It is also worth asking the landlord whether removal of a previous tenant’s abandoned systems is their obligation or yours.
Problem 5: Life safety, energy code and the final inspection
The last surprise usually arrives at the end, and it is the one that literally keeps the doors closed: in most jurisdictions, you cannot occupy the space until the building inspections are passed, and the electrical final is one of them.
The items that most often hold up a final:
- Exit signs and emergency lighting. Required along the path of egress, with battery or generator backup, and tested. Changing the layout of a space changes the egress path, which changes where they have to be.
- Fire alarm coordination. Fire alarm work is often a separate contractor and a separate permit, but it depends on electrical — dedicated circuits, device locations, and connections to equipment like kitchen hoods and HVAC shutdowns.
- Energy code lighting controls. Commercial energy codes require occupancy sensors, daylight controls, automatic shutoff and similar measures, and many require them to be functionally tested and documented before final. Lighting controls left to the last week tend to fail that step.
- Labeling and documentation. Accurate panel schedules, labeled disconnects, and the closeout paperwork the inspector expects to see.
- Working clearances. Shelving, millwork or storage built in front of an electrical panel is a common and entirely avoidable failure.
Each of these is a small item on its own. Together, at the end of a job, they are a week. And a failed final means a re-inspection, scheduled whenever the inspector’s calendar allows.
Why these stay hidden
The pattern across all five is the same. Each problem is invisible from the business owner’s side of the project:
- The lease describes square footage, not amperage.
- Equipment suppliers sell to a spec sheet, not to your building.
- Long-lead gear is a procurement issue nobody owns until it is late.
- The previous tenant’s work is behind the ceiling tiles.
- The final inspection is the last thing on the schedule, so it is the last thing anyone plans for.
And the electrical contractor is often brought in after the decisions that cause them have already been made.
When to bring an electrician in
Before the lease is signed, if the space is not already built out for a business like yours. A site visit at that stage is short and inexpensive, and it is the only point at which a capacity problem is a negotiating position rather than a cost.
Before equipment is ordered, with the cut sheets in hand.
At design, not after it, so long-lead gear and code requirements shape the drawings instead of revising them.
The general contractor, the architect and the landlord all have a part in this. The point is not who brings the electrician in — only that someone does it early.
What to ask before you commit to a date
- What is the electrical service to this space — amps, voltage, phase — and how much of it is available to us?
- Does our equipment list fit that service, and does every item match its voltage and phase?
- Which pieces of electrical gear have long lead times, and when do they need to be ordered?
- What did the site survey find above the ceiling and in the panels?
- What life-safety and energy-code items does this scope trigger, and who is testing them?
- Who is pulling the permits, and when are the inspections scheduled?
If those questions have clear answers, the opening date is a plan. If they do not, it is a hope.
The short version
Confirm the power before you sign the lease. Match every piece of equipment to the building’s voltage and phase before you order it. Order long-lead gear early. Survey what the last tenant left behind before demolition finds it for you. Plan the final inspection from the first day, not the last week.
We work with owners, tenants and general contractors from the first site visit to the final inspection, and we would rather flag a problem at the lease stage than explain it at the ribbon cutting.
