What to Expect During a Commercial TI Electrical Walkthrough

If you’re planning a tenant improvement (TI) project, the electrical walkthrough is where everything starts to get real. This isn’t just a quick site visit it’s the step that defines your budget, timeline, and feasibility.

Done right, it uncovers hidden constraints before construction begins. Done poorly (or skipped), it almost guarantees change orders, delays, and unexpected costs halfway through the build.

This guide breaks down exactly what happens during a commercial TI electrical walkthrough, what your electrician is evaluating, the questions you should be asking, and how this step fits into the broader tenant improvement electrical process.

What Is a TI Electrical Walkthrough?

A commercial TI electrical walkthrough is an on-site evaluation performed before design finalization and permitting. The goal is to assess the existing electrical infrastructure and determine what’s required to support the new tenant’s operations.

When It Happens

This typically takes place:

• After lease signing
• Before final design drawings are completed
• Before permit submission

At this stage, decisions are still flexible, which is exactly why it’s valuable. Catching issues here is far cheaper than fixing them during construction.

Who Should Be There

A proper walkthrough usually includes:

• Electrical contractor
• General contractor (GC)
• Tenant or business owner
• Architect or designer (when available)

Each role contributes a different perspective:

• The electrician evaluates feasibility and code compliance
• The GC looks at sequencing and logistics
• The tenant defines operational needs
• The architect aligns design with infrastructure

If you’re working with an experienced tenant improvement electrician in Los Angeles, they’ll guide the conversation and make sure nothing critical is missed.

What the Electrician Is Looking For

This is where most of the value comes from. A skilled electrician is essentially reverse-engineering the building’s electrical system and stress-testing it against your future needs.

1. Existing Panel Capacity and Condition

First question: Can the current system handle your load?

The electrician will:

• Check panel amperage (e.g., 100A, 200A, 400A)
• Inspect physical condition (corrosion, overheating signs)
• Evaluate available breaker space

If your business requires more power (common in restaurants, retail with heavy lighting, or offices with dense equipment), the panel may need:

• Reconfiguration
• Subpanel addition
• Full service upgrade

This is often the biggest cost driver in a TI project.

2. Current Circuit Layout and Availability

Even if the panel has capacity, the circuit layout might not work for your use.

The electrician evaluates:

• How circuits are distributed
• Whether dedicated circuits exist where needed
• If circuits can be repurposed or extended

For example:

• A retail space may lack sufficient circuits for commercial kitchen equipment
• An office conversion may need more workstation circuits

Poor circuit planning leads to overloaded breakers and unreliable power. Something you want to avoid from day one.

3. Condition of Existing Wiring

Older buildings often hide aging or non-compliant wiring.

The walkthrough checks for:

• Degraded insulation
• Aluminum wiring (in some older properties)
• Improper splices or amateur modifications

If the wiring isn’t up to code, it’s not just a compliance issue it’s a liability and safety risk.

4. Code Compliance Issues

A major part of the TI electrical inspection process is identifying code violations before the city does.

Common issues include:

• Improper grounding
• Missing GFCI/AFCI protection
• Non-compliant conduit installations
• Overfilled panels

Fixing these early prevents failed inspections later, which can stall your project timeline.

5. HVAC Electrical Requirements

HVAC is one of the largest electrical loads in any commercial space.

The electrician will:

• Confirm voltage and amperage requirements
• Check if existing circuits support HVAC units
• Coordinate with mechanical plans

If HVAC upgrades are needed, electrical infrastructure often needs to be upgraded alongside it.

6. Lighting Layout Feasibility

Lighting isn’t just about design, it’s about infrastructure.

The electrician evaluates:

• Whether the current wiring supports the proposed layout
• Load impact of new fixtures
• Code requirements for energy efficiency

If you’re planning upgrades, coordination with lighting fixture installation services becomes critical to avoid rework.

7. Data and Network Infrastructure

Modern commercial spaces depend heavily on data systems.

During the walkthrough:

• Existing low-voltage pathways are assessed
• Conduit availability is reviewed
• Server or telecom room requirements are discussed

Ignoring this early often leads to messy retrofits later.

8. Fire Alarm and Emergency Systems

Life safety systems are non-negotiable.

The electrician checks:

• Existing fire alarm system condition
• Emergency lighting compliance
• Exit sign placement and functionality

These systems must meet strict code requirements and often require upgrades during a TI.

9. Access and Installation Challenges

This is where practical experience matters.

The walkthrough identifies:

• Ceiling type (drop ceiling vs. hard lid)
• Wall construction (drywall, concrete, etc.)
• Accessibility constraints

Why it matters:

• Difficult access increases labor cost
• It affects installation time
• It can limit design flexibility

Questions You Should Ask During the Walkthrough

Most tenants and GCs underutilize this moment. This is your chance to get clarity before committing.

1. Will the Existing Panel Support My Needs?

Don’t settle for “probably.” You want a clear yes or no, with reasoning.

2. Do I Need a Service Upgrade?

If the answer is yes, ask:

• How much additional capacity is required?
• What’s the cost range?
• Will it involve utility coordination?

3. What Permits Will Be Required?

Electrical work almost always requires permits.

Your contractor should outline:

• Scope of permitting
• Expected timelines
• Inspection stages

A qualified commercial electrician will already be familiar with local jurisdiction requirements.

4. How Long Will the Electrical Portion Take?

You need realistic scheduling, not optimistic guesses.

Electrical timelines depend on:

• Scope complexity
• Permit approval speed
• Coordination with other trades

5. Will I Need to Coordinate with Edison?

If a service upgrade is required, utility involvement is likely.

This can introduce:

• Additional timelines
• Inspections
• Utility-side upgrades

6. What’s the Rough Cost Range?

Even a preliminary range is valuable.

This helps you:

• Validate project feasibility
• Align with budget early
• Avoid surprises during bidding

Common Issues Found During TI Walkthroughs

These issues show up consistently across commercial TI projects. They are not rare edge cases. Identifying them early is one of the main reasons the walkthrough matters.

1. Undersized Panels

Many commercial spaces were originally built for tenants with lower electrical demand. A small retail shop or office might have operated fine on a limited panel, but that same infrastructure often cannot support modern equipment, lighting, or HVAC loads.

During the walkthrough, electricians frequently find panels that are already at capacity or close to it. There may be no available breaker space, or the total amperage is simply too low for the new tenant’s needs.

Result:

• Immediate need for panel upgrade or service upgrade
• Increased project cost and potential utility coordination

2. Outdated Wiring

Older buildings often contain wiring that no longer meets current electrical codes. This includes degraded insulation, improper installations, or legacy materials that are no longer considered safe.

Even if the system is still functioning, it may fail inspection once new work is introduced. Electrical upgrades trigger code compliance requirements, which means existing deficiencies cannot be ignored.

Result:

• Mandatory replacement of non-compliant wiring
• Increased labor scope and safety concerns if left unaddressed

3. Unpermitted Modifications

It is common to find electrical work completed by previous tenants without proper permits or inspections. These modifications are often hidden above ceilings or behind walls and only become visible during a walkthrough or demolition.

Examples include:

• Tapped circuits without proper protection
• Improvised wiring extensions
• Panels modified without documentation

These conditions create risk because they are not verified to meet code.

Result:

• Hidden violations that must be corrected
• Required rework before permit approval or inspection sign-off

4. Insufficient Circuits

A space’s existing circuit layout is usually tailored to its previous use. When the new tenant has different operational needs, the existing circuits often fall short.

For example, converting a retail space into a restaurant introduces:

• High-load kitchen equipment
• Additional refrigeration
• More intensive lighting and exhaust systems

The existing infrastructure rarely supports this without significant changes.

Result:

• Extensive rewiring and circuit additions
• Possible installation of subpanels to distribute load effectively

If your project involves food service or other high-demand applications, working with a specialist such as a restaurant electrician in Los Angeles helps ensure the system is designed correctly from the start.

5. Hazardous Materials (Asbestos or Lead)

In older commercial buildings, electrical work can expose hazardous materials such as asbestos insulation or lead-based paint. These are not electrical issues by themselves, but they directly impact how electrical work can be performed.

Once identified, strict handling and removal procedures must be followed before work can continue.

Result:

• Required abatement by certified professionals
• Increased cost and extended project timeline due to regulatory compliance

What Happens After the Walkthrough

The walkthrough is not just an assessment. It directly informs how your project will be executed from planning through construction. What happens next determines whether your TI project runs smoothly or runs into delays, budget overruns, and inspection issues.

1. Scope of Work and Estimate

After the walkthrough, your electrician translates field observations into a clear and structured scope of work. This document outlines exactly what needs to be done to bring the space up to code and support your operational requirements.

A well-prepared scope typically includes:

• Panel upgrades or replacements if capacity is insufficient
• New circuit installations and load distribution plans
• Lighting installation or reconfiguration
• Low-voltage and data infrastructure
• Code corrections for any existing violations

Alongside the scope, you will receive a cost estimate. This is not just a rough guess. A professional estimate is based on actual site conditions, labor requirements, material costs, and known constraints identified during the walkthrough.

You should also expect identified risks. These may include limited access areas, potential utility delays, or unknown conditions behind walls and ceilings. Calling these out early helps prevent unexpected change orders later.

If you are working with a qualified commercial electrician, the scope will be detailed enough to coordinate with other trades and support permit submission without major revisions.

2. Permit Applications

Once the scope is defined, the next step is permitting. Electrical work in commercial TI projects requires approval from the local jurisdiction before construction can begin.

Your electrician will prepare:

• Electrical drawings that reflect the proposed installation
• Load calculations to verify the system can safely handle demand
• Panel schedules and circuit layouts
• Supporting documentation required by the city

This phase is critical because incomplete or inaccurate submissions can delay approval. In some cases, plans are sent back for corrections, which adds time to your schedule.

An experienced tenant improvement electrician in Los Angeles understands local permitting requirements and can streamline this process. They will design the system to meet both your needs and code requirements from the start, reducing back-and-forth with plan reviewers.

If your project involves a service upgrade, this is also when coordination with the utility company begins. Utility timelines can be longer than internal construction timelines, so early initiation is important.

3. Coordination with GC

Electrical work does not happen in isolation. It must be tightly coordinated with the general contractor and other trades to avoid conflicts and delays.

At this stage, your electrician works with the GC to:

• Align on construction sequencing
• Integrate electrical rough-in with framing timelines
• Coordinate with HVAC equipment installation and power requirements
• Ensure plumbing and electrical systems do not conflict in shared spaces

For example, conduit routing must be planned around ductwork and structural elements. Lighting layouts must align with ceiling framing. Panel locations must remain accessible and compliant.

Poor coordination at this stage leads to rework. Rework increases labor costs and extends the project timeline. Strong communication between your electrician and GC ensures that installations happen efficiently and inspections pass the first time.

If your project includes specialized needs such as kitchen equipment or high-load systems, coordination becomes even more important. In these cases, working with a contractor experienced in specific use cases such as a restaurant electrician in Los Angeles can prevent design conflicts and capacity issues.

4. Rough-In Scheduling

After permits are approved, the project moves into active construction. The first major electrical phase is rough-in.

Electrical rough-in includes:

• Running conduit and wiring through walls and ceilings
• Installing electrical boxes for outlets, switches, and equipment
• Setting up panel connections and circuit pathways

This work happens before walls are closed and ceilings are finished. Timing is critical. If rough-in is delayed, it holds up framing, drywall, and other trades.

Inspections are scheduled during this phase. The inspector verifies that all wiring, conduit, and installations meet code requirements before the system is concealed. Failing an inspection can cause delays and require corrections, so accuracy during installation is essential.

Once rough-in passes inspection, the project moves forward to finish work, which includes installing fixtures, devices, and final connections. If your project involves lighting upgrades, coordination with lighting fixture installation services ensures that final installation aligns with both design and code requirements.

At this point, your TI project is fully in motion. The quality of the earlier walkthrough and planning phases becomes visible in how smoothly construction progresses.