Tenant Improvement Electrical: What Landlords Must Know 

Most tenant improvement electrical problems don’t start with bad wiring. They start with a question nobody answered before the drywall went up: who is actually responsible for this work, and does the lease say so in writing?

A tenant signs a lease, gets a tenant improvement allowance, and assumes the electrical scope is someone else’s problem to sort out. A landlord assumes the tenant’s contractor has it handled. By the time a panel turns out to be undersized or a permit gets flagged mid-build, the disagreement is no longer about electrical work. It is about money, and it is happening on a deadline. Tenant improvement electrical planning done before the lease is signed prevents almost all of this.

This post covers what TI electrical work actually includes, who typically pays for it, the code requirements that apply regardless of what the lease says, and the lien exposure landlords face even when they never hired a contractor themselves.

QUICK TAKEAWAY

Primary InsightNearly every tenant improvement electrical dispute traces back to scope or payment responsibility that was not defined in the lease work letter before construction started.

Key FactUnder California Civil Code § 8444, a landlord who did not contract for the work must both post and record a Notice of Nonresponsibility within 10 days of learning of the work of improvement to shield the property from a mechanics lien.

Best Suited ForCommercial tenants, property managers, and landlords planning or negotiating a tenant improvement build-out anywhere in California.

What Counts as Tenant Improvement Electrical Work

Tenant improvement (TI) electrical work is the electrical scope required to adapt a leased commercial space for a specific tenant’s use. That typically includes new circuits, dedicated lines for equipment, outlet placement, lighting design and fixtures, panel or subpanel work sized to the space, and low-voltage rough-in for data and communications.

The scope varies enormously by tenant type. An office suite needs outlet density, lighting controls, and maybe a server closet circuit. A restaurant needs dedicated circuits for kitchen equipment, often at a much higher amperage than the base building was designed for. A medical office needs isolated grounding and backup power for certain equipment. A retail tenant needs display lighting and point-of-sale circuits. None of these are interchangeable, and a TI electrical bid scoped for one tenant type does not transfer to another.

The building’s existing electrical infrastructure sets the ceiling on what is possible. A space with an undersized panel or a service entrance already near capacity may need a panel upgrade before any tenant-specific work can even start, and that is a different budget line and permit process than the interior build-out itself.

Who Pays: Landlord, Tenant, and the TI Allowance

Payment responsibility for tenant improvement electrical work is determined by the lease’s work letter, not by any default rule. Most commercial leases include a tenant improvement allowance (TIA), a dollar amount often quoted per square foot that the landlord contributes toward the build-out. Whether electrical work is covered by that allowance, billed separately, or split between landlord and tenant depends entirely on what the work letter specifies.

Panel upgrades are the most common point of dispute. Because a panel upgrade increases the building’s long-term value and usually outlasts any single tenant, it is often negotiated as landlord-funded or landlord-shared work, even when the rest of the TI electrical scope is tenant-funded. When the lease does not address this explicitly, the disagreement tends to surface mid-project, which is the worst possible time to negotiate it.

The cleanest approach is to define electrical scope and payment responsibility in the work letter before signing, not to leave it as an assumption. That includes stating explicitly who is responsible for a panel or service upgrade if the tenant’s equipment load requires one.

Permits and Code Compliance Nobody Can Skip

Two requirements apply to TI electrical work in California regardless of what any lease says, how small the job seems, or whether the tenant wants to save time by skipping steps.

A licensed electrical contractor is required. California defines electrical contracting broadly: placing, installing, or connecting wires, fixtures, or equipment that generate, transmit, transform, or utilize electrical energy in any form requires a C-10 Electrical Contractor license from the Contractors State License Board. Unpermitted or unlicensed electrical work in a leased space can hold up a certificate of occupancy, create liability that follows the property through a future sale, and void portions of a property insurance policy.

Title 24 lighting compliance applies to TI projects, not just new construction. California’s Building Energy Efficiency Standards (Title 24, Part 6, administered by the California Energy Commission) govern lighting power density and lighting controls in nonresidential buildings, and alterations that modify lighting circuits trigger compliance even inside an existing shell. The 2025 edition of the standards took effect January 1, 2026 and is the currently enforced code. A TI electrical scope that swaps out old fixtures without addressing controls can pass an initial walkthrough and still fail a permitted inspection.

Both of these requirements exist independent of the lease. A property manager who signs off on a contractor bid without confirming licensing, or a tenant who tries to save money by skipping a permit, is taking on liability that has nothing to do with the quality of the electrical work itself.

The Lien Risk Landlords Don’t See Coming

Landlords can face a mechanics lien on their own property from tenant improvement work they never authorized. Even when the tenant hires and pays their own contractor directly, an unpaid contractor, subcontractor, or material supplier can record a lien against the property where the work happened, and the property owner does not have to have signed the contract for that exposure to exist.

The protection available to a landlord who did not authorize the work is a Notice of Nonresponsibility under California Civil Code § 8444. To be effective, the notice has to be both posted at the property and recorded with the county recorder within 10 days after the landlord has knowledge of the work of improvement. Miss that window, and the protection does not apply.

This is a reason for landlords to stay informed about tenant-controlled electrical work even when they are not paying for it directly, and a reason for tenants to work with contractors who carry proper licensing and bonding. An unlicensed or underfunded contractor is far more likely to leave subcontractors unpaid.

How to Scope a TI Electrical Project the Right Way

A handful of steps prevent the majority of TI electrical disputes and delays.

Get a site visit before a number gets attached to anything. An accurate bid requires seeing the existing panel, understanding the current load profile, and reviewing the space in person. A quote given without a site visit is an estimate, not a scope.

Confirm equipment specifications before the electrical design is finalized, not after. Restaurant equipment, medical imaging equipment, and manufacturing equipment often have amperage and voltage requirements that are not finalized until a vendor is selected, sometimes after the lease is already signed. A load calculation done against outdated equipment specs gets revised mid-build, which is a common source of both delay and cost overrun.

Put panel upgrade responsibility and Title 24 compliance in writing in the work letter. Verbal understandings between the property manager and the tenant’s contractor are the source material for later disputes.

Sequence the work correctly. When both a building-level electrical upgrade and tenant-specific TI work are needed on the same project, the panel or service work typically needs to be inspected and signed off before the interior TI electrical work can proceed on top of it.

Frequently Asked Questions

Does tenant improvement electrical work always require a permit in California?

Tenant improvement electrical work requires a permit and inspection from the local building department whenever it involves new circuits, new wiring, or changes to the distribution system, regardless of the size of the tenant’s space or the scope of the interior build-out.

Who is responsible for a panel upgrade during a TI project, the landlord or the tenant?

Panel upgrade responsibility during a TI project is determined by what the lease’s work letter specifies. Because panel upgrades add long-term value to the building, they are frequently negotiated as landlord-funded or landlord-shared, but that split needs to be stated explicitly in the lease rather than assumed.

Can a landlord be liable for electrical work they didn’t hire the contractor for?

Landlord liability for electrical work performed by a tenant’s contractor is a real exposure under California’s mechanics lien law, unless the landlord posts and records a Notice of Nonresponsibility under Civil Code § 8444 within 10 days of learning the work is underway.

Does Title 24 apply to a TI electrical project inside an existing building, or only new construction?

Title 24 applies to TI projects inside existing buildings, not only to new construction. Alterations that add, remove, or modify lighting circuits trigger Title 24, Part 6 lighting compliance even when the rest of the building shell is untouched.

How long does a TI electrical build-out typically take?

Tenant improvement electrical build-out timelines depend on scope. A single-suite office fit-out may take days to a couple of weeks, while a project requiring a panel or service upgrade first will take longer, since that upstream work generally needs to be inspected and approved before interior TI work can proceed.

Getting the Electrical Scope Right Before the Lease Is Signed

The pattern behind almost every tenant improvement electrical dispute is the same: a question about scope, payment, or code responsibility that did not get answered on paper before construction started. Answering those questions in the work letter, confirming licensing and permitting requirements upfront, and understanding the lien exposure on all sides costs nothing and prevents the change orders and delays that show up otherwise.

Sebastian Corp’s commercial electrical team scopes tenant improvement work across the Central Valley from initial site assessment through permitted final inspection, working directly with tenants, property managers, and general contractors to define the electrical scope before it becomes a source of disagreement. If you are planning a build-out or reviewing a lease that involves electrical work, request a proposal for a straightforward conversation about scope.