Commercial Tenant Improvement electrical contractor Bay Area

Commercial · Tenant improvements

Tenant Improvement Electrical Wiring, From existing space to working suite.

Turn the approved tenant layout into a coordinated electrical scope. Plan demolition, new circuits, lighting and equipment connections around the building you are moving into.

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Project planning

Bring the lease work letter, current plans and the equipment list. These five decisions shape the electrical package.

Starting point Existing panels and circuits

Scope boundary Tenant vs. landlord work

Coordination Ceilings, HVAC and furniture

Access Outages and occupied areas

Handoff Plans, labels and records

The starting point

Start with what the building actually provides.

A commercial electrical build-out starts before new wiring is installed. The existing service, tenant feeder, panel schedules and demolition limits determine what can remain and what needs to change. An empty breaker space alone does not establish available capacity.

For a tenant improvement, compare the proposed layout with the landlord's work letter and the other trades' drawings. That makes base-building work, tenant work and unresolved design decisions visible before a construction schedule depends on them.

Project concepts

Explore the installation possibilities

Drag the divider to compare before and after, or open a comparison for a closer look.

Office lighting — illustrative design concept — View comparison

Office lighting before work, illustrative comparison — View comparison

Retail systems — illustrative design concept — View comparison

Retail systems before work, illustrative comparison — View comparison

Scope of work

The electrical decisions behind a tenant fit-out.

Survey before demolition

Identify circuits to retain, equipment to relocate and wiring that can be removed. Confirm which adjacent spaces share the affected systems.

Panel and circuit planning

Review the equipment schedule and load information, then define branch circuits, distribution changes and any required feeder or service review.

Lighting and controls

Coordinate fixture locations, switching and control zones with the ceiling plan. Identify applicable energy-code documents and testing responsibilities.

Mechanical connections

Match power connections and disconnect locations to the approved HVAC, water-heating and other equipment submittals before rough-in.

Occupied-building sequence

Agree access, outage windows and temporary operating needs with the tenant and property manager. Keep these constraints visible in the construction schedule.

Inspection and turnover

Plan rough and final inspections around the work. Define the marked-up drawings, circuit directories and operating information needed at handoff.

Commercial Tenant Improvement scope of work — illustrative service image

Project handoff

A handoff the next contractor can use.

Confirm these records in the project scope so completed work remains understandable after the move.

Circuit directory

Identify the spaces and equipment served by the new or modified circuits.

Marked-up plans

Record agreed routing and installation changes made during construction.

Control records

Keep programming information and applicable installation or acceptance documents with the project files.

Equipment information

Collect product details and maintenance instructions for the equipment included in the electrical contract.

Project scenarios

Different starting spaces need different scopes.

A square-foot allowance cannot describe every tenant improvement. Start with the condition and intended use of the space.

Occupied suite

Phased alterations

Keep the operation in view

New partitions, moved workstations or a reworked reception area may affect existing circuits. Map the occupied zones and plan each outage before changes begin.

Vacant suite

New tenant layout

Verify what can be reused

Review existing panels, fixtures and above-ceiling wiring against the new layout. Reuse should follow a condition and capacity review, not an assumption from the previous tenant.

Shell or change of use

Distribution and systems

Resolve the upstream scope

A new use can change equipment loads, lighting and distribution. Clarify design responsibility and base-building capacity before pricing only the visible outlets and fixtures.

The proposal should identify permit scope, landlord work, testing, access restrictions and unresolved design items separately.

Project concepts

Installation details

Drag the divider to compare before and after, or open a comparison for a closer look.

Meeting-room connections — illustrative design concept — View comparison

Meeting-room connections before work, illustrative comparison — View comparison

Support spaces — illustrative design concept — View comparison

Support spaces before work, illustrative comparison — View comparison

FAQ

Planning a commercial electrical remodel.

Tenant improvement electrical wiring covers everything between the tenant panel and the devices in the suite: removal of abandoned circuits, new branch circuits for receptacles and equipment, lighting and controls, and connections to HVAC and kitchen equipment. Base-building risers, the main service and the fire alarm system are usually landlord scope unless the lease work letter assigns them to the tenant.

The 2025 California Electrical Code (based on the 2023 NEC) sets a minimum general lighting load of 1.3 volt-amperes per square foot for offices in Table 220.42(A), with the 125% continuous-load factor already included. Where receptacle loads are not known, Section 220.14(K) adds 1 VA per square foot. A 5,000 sq ft office suite starts at 6,500 VA of lighting and 5,000 VA of receptacles before HVAC, kitchen and equipment loads are added from nameplates.

Yes, if the panel is in good condition and the load calculation shows capacity on the tenant feeder. Empty breaker spaces do not prove capacity. A new subpanel adds circuit spaces, not capacity on the upstream service.

Yes, once the work alters 10 percent or more of the luminaires in an enclosed space. Title 24 Part 6, §141.0(b)2I, then requires the altered lighting to meet current lighting power and control rules. Below 10 percent, the existing luminaires can stay as they are. Where new controls need acceptance testing, a certified acceptance test technician completes the forms before final inspection. See the California Energy Commission's acceptance-testing guidance.

Yes. The California Building Code requires egress paths to have emergency lighting that averages at least 1 footcandle, with no point below 0.1 footcandle, for at least 90 minutes on battery or generator power. New walls and rooms often mean moving exit signs and adding emergency fixtures, and inspectors check them at final.

Yes. New circuits, panel work and lighting alterations in a California commercial suite need an electrical permit, and most tenant improvements go through plan check together with the building permit. The licensed contractor pulls the electrical permit and schedules the rough and final inspections. YKCA holds CSLB C-10 Electrical and B General Building licenses.

Yes, it can be scoped alongside power. Separate cable locations, pathways, patch panels and testing from network equipment configuration, internet service and software so the handoff to IT is clear.

Yes, by phasing the work and scheduling outages, often after hours or on weekends. Identify the equipment that must stay powered and the areas available for each phase, and agree temporary power before the affected work is scheduled.

Related construction service

Planning the full tenant improvement?

The construction scope may also include walls, ceilings, finishes and coordination between trades. Review the broader tenant improvement service alongside the electrical package.

General Contracting

Commercial Tenant Improvement Electrical, Bid-to-Closeout — illustrative service image

Plan your project

Bring the plans and the building constraints.

Tell us the property location, current use, proposed layout and project stage. Include the landlord's electrical requirements if they are available.

Discuss your project (650) 550-0819

Questions worth a closer look

From a short answer to a practical plan.

Explore the causes, tradeoffs and records behind these common project questions.

What should an electrical review establish before we sign a commercial lease?

It should compare the proposed equipment schedule with the actual voltage, phase, tenant feeder and upstream capacity, then identify required upgrades, landlord approvals and outage constraints. Empty breaker spaces alone do not establish available capacity.

Read the full guide: Check a commercial space’s electrical capacity before signing the lease ↗

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