If you get this step wrong, everything downstream gets expensive.
A commercial tenant improvement (TI) electrical walkthrough is where your real budget and timeline get set, not when you sign the lease, not when drawings are finished. This is the moment where assumptions meet reality.
Miss things here, and you will deal with:
- Change orders mid-project
- Delays from failed inspections
- Equipment that cannot be powered
- Unexpected utility coordination
Get it right, and the project runs clean.
This guide breaks down what actually happens during a commercial TI electrical walkthrough, what electricians are evaluating, what you should be asking, and where most projects go sideways.
What Is a TI Electrical Walkthrough
In plain terms:
It is an on-site evaluation of an existing commercial space to determine what electrical infrastructure exists and what needs to change for your buildout.
This typically happens:
- After lease signing
- Before permit submission
- Before finalizing construction drawings, ideally. Not always done this way, which causes problems
Who should be there
At minimum:
- Electrician or TI electrical contractor
- General contractor
Sometimes:
- Tenant, especially if equipment-heavy like restaurant or medical
- Architect or designer
If your electrician is not walking the space before quoting, that is a red flag. They are guessing.
What the Electrician Is Looking For
This is not a casual walkthrough. A good electrician is mentally building your entire system while standing in that space.
1. Panel Capacity and Condition
First question:
Can the existing panel even support your load?
They will check:
- Panel amperage rating
- Available breaker space
- Load calculation vs expected demand
- Physical condition such as corrosion, overheating signs, outdated gear
This is where projects often break:
- Retail to restaurant conversions almost always overload existing panels
- Older buildings may not support modern equipment loads
2. Existing Circuit Layout
They are mapping:
- What circuits exist
- What they serve
- What can be reused vs abandoned
Reality check:
Most existing circuits are not reusable for a new tenant layout without modification.
3. Wiring Condition
Not all wiring is equal.
They are looking for:
- Degraded insulation
- Aluminum wiring in certain cases
- Improper splices
- Code violations hidden above ceilings
Old wiring does not automatically mean replacement, but it often means liability and inspection risk.
4. Code Compliance Issues
Here is where things get uncomfortable.
Previous tenants often:
- Did unpermitted work
- Modified circuits improperly
- Added loads without upgrading panels
Your project inherits those problems.
During a TI electrical inspection, anything non-compliant may need to be corrected, even if you did not create it.
5. HVAC Electrical Requirements
This gets underestimated constantly.
HVAC systems require:
- Dedicated circuits
- Specific voltage requirements
- Disconnects and controls
If HVAC upgrades are part of your TI:
- Electrical scope increases quickly
- Panel capacity becomes a bigger issue
6. Lighting Layout Feasibility
Your architect might design a clean lighting plan.
The electrician asks:
- Can this actually be wired efficiently?
- Are there structural limitations?
- Will it require excessive conduit runs or demolition?
This is where design meets installation reality.
7. Data and Network Infrastructure
Modern commercial spaces need:
- Data cabling pathways
- Server or rack locations
- Power for networking equipment
If ignored early:
- You end up retrofitting after walls are closed
- Costs increase significantly
8. Fire Alarm and Emergency Systems
Code requirements include:
- Exit signage
- Emergency lighting
- Fire alarm system integration
If the building has an existing system:
- It may need expansion or modification
- Requires coordination with fire alarm vendors
This is not optional. It is inspection-critical.
9. Access Constraints
This is the stuff people do not think about:
- Ceiling type such as open or hard lid
- Ceiling height
- Wall construction such as concrete or drywall
- Accessibility to run conduit
These factors directly impact:
- Labor cost
- Installation time
- Feasibility of certain layouts
Questions You Should Ask During the Walkthrough
Most tenants and even some general contractors do not ask enough here.
Use this moment properly.
1. Will the existing panel support my needs?
Do not accept a vague answer.
Push for:
- Rough load assessment
- Whether expansion is possible
- Risk level of staying on existing service
2. Do I need a service upgrade?
This is a big one.
A service upgrade means:
- Utility coordination
- Possible trenching or new feeders
- Longer timelines
If this is needed and missed early, your project gets delayed significantly.
3. What permits will be required?
Electrical permits are standard, but scope matters:
- Panel upgrades
- Service upgrades
- Fire alarm systems
More scope means more review time.
4. How long will the electrical portion take?
You are looking for:
- Rough-in duration
- Inspection timelines
- Dependencies on other trades
If timelines sound overly optimistic, question them.
5. Will I need to coordinate with the utility?
In Southern California, that usually means Southern California Edison.
Utility involvement is required for:
- Service upgrades
- Meter changes
- Load increases
Utilities operate on their own timelines, not yours.
6. What is the rough cost range?
You do not need an exact quote yet.
You need:
- Ballpark range
- Cost drivers
- Risk areas that could increase price
If someone gives you a low number without hesitation, assume it is incomplete.
Common Issues Found During TI Walkthroughs
This is where reality hits.
Undersized Panels
Original buildouts were often designed for lighter use.
Example:
- Retail boutique to restaurant conversion equals massive load increase
Result:
- Panel replacement or service upgrade required
Outdated Wiring
Older buildings often have:
- Wiring that does not meet current code
- Materials that are no longer acceptable
Even if it works, it may not pass inspection.
Unpermitted Modifications
Previous tenants cut corners.
You will find:
- Mystery circuits
- Overloaded breakers
- Unsafe connections
All of this becomes your problem during permitting.
Insufficient Circuits
Modern operations need more:
- Dedicated equipment circuits
- Clean power distribution
Trying to reuse old layouts usually fails.
Hazardous Materials
In older buildings:
- Asbestos
- Lead paint
If discovered:
- Work pauses
- Abatement required
- Costs increase
What Happens After the Walkthrough
This is where the project becomes real.
Scope of Work and Estimate
The electrician develops:
- Detailed scope
- Material requirements
- Labor estimate
This should align with your actual needs, not assumptions.
Permit Applications
Plans are finalized and submitted.
Expect:
- Review cycles
- Corrections if needed
- Delays depending on jurisdiction
Coordination with General Contractor
Electrical work is tightly tied to:
- Framing
- HVAC
- Plumbing
Bad coordination causes rework.
Rough-In Scheduling
Once approved:
- Conduit, wiring, and boxes are installed
- Inspections are scheduled
This phase sets up everything for final installation.
Schedule Your TI Walkthrough
If you are planning a buildout, do not treat the walkthrough like a formality.
It is the highest leverage step in the entire electrical process.
Start with a proper evaluation through a Tenant Improvement Electrician Los Angeles to understand your actual requirements. If you are comparing options or need broader support, reviewing Commercial Electrician Services helps clarify scope across trades.
For projects involving specialized layouts such as kitchens, early alignment with a Restaurant Electrician Los Angeles can prevent major redesigns later. Lighting plans can also be validated upfront through Lighting Fixture Installation to ensure feasibility before construction starts.
Schedule a walkthrough early, get a real assessment, and make decisions based on actual conditions, not assumptions.
Bottom line
A commercial TI electrical walkthrough is not just a checklist.
It is where your project either becomes predictable or starts accumulating risk.
Most people underestimate it.
That is why most projects run into avoidable problems.
How Much Does It Cost to Upgrade Panels in a Multi-Unit Building?
The cost of a multi-unit upgrade varies significantly based on the age of the existing wiring. If the building’s internal wiring is in good condition, we can often perform a “panel swap” and service upgrade. If the wiring is brittle or ungrounded, the scope increases.
Factors that affect the price include:
-
The number of units: Scaling the project can often reduce the per-unit cost.
-
Accessibility: Is the main switchgear in a basement, a narrow closet, or on an exterior wall?
-
Utility requirements: Does LADWP require a new transformer or trenching to support the increased load?
While it’s tempting to go with the lowest bid, landlords should look for contractors who specialize in multi-meter commercial systems. A cheap job that fails a city inspection can end up costing twice as much in delays and legal fees.
Talk to an Electrician Who Understands Landlord Needs
At Power Route Electric, we don’t just see ourselves as technicians; we see ourselves as partners in your property management strategy. We understand the nuances of Los Angeles rent control, the pressure from insurance companies, and the need to keep tenants happy during construction.
Whether you own a small duplex or a large-scale apartment complex, we can provide a comprehensive assessment of your building’s current electrical health. We’ll help you prioritize your upgrades to maximize safety and legal cost-recovery options.
Protect your investment and your tenants today.
Call Power Route Electric at (818) 200-6572 for a free assessment of your building’s electrical system.
