Rewiring & Retrofit

Commercial Rewiring & Electrical Retrofit in Houston , TX

Rewiring, capacity upgrades, and code-correction work for existing commercial buildings — phased around your operations so the business stays open while the electrical system catches up. Southern Electrical Services, Houston since 1991. TDLR #TECL18759.

Get a Free Quote ☎ (713) 660-7344

Most of Houston's commercial building stock was wired for a different era — before every desk carried a computer, before high-efficiency HVAC and EV charging, before server closets and commercial kitchens loaded circuits their designers never imagined. Southern Electrical Services rewires and retrofits existing commercial buildings across Greater Houston: replacing aging and undersized wiring, upgrading panels and services, correcting code violations, and bringing legacy electrical systems up to what the building actually demands today.

Retrofit work is a different trade than new construction. There are no open walls and no empty floors — there are tenants, inventory, ceilings full of forty years of accumulated cabling, and panel schedules that stopped matching reality decades ago. Since 1991 we have worked inside exactly these buildings, tracing what is really there, planning cutovers around business hours, and delivering systems that pass inspection with the City of Houston and Harris County the first time.

Building new instead of upgrading? Ground-up construction and tenant build-out wiring is its own discipline — see our electrical wiring installation page for new-construction rough-in through trim, permits, and GC coordination.

Commercial Rewiring & Retrofit Services

Full & Partial Building Rewiring

Replacement of aging, damaged, or non-compliant branch wiring — from a single problem suite to a complete building. We survey and document the existing system first, so the scope reflects what is actually in the walls, not guesswork.

Capacity & Service Upgrades

Buildings running out of power: upgraded service entrances, larger feeders, added panels, and new dedicated circuits for equipment the original design never anticipated. Utility coordination with CenterPoint Energy handled start to finish.

Panel & Switchgear Replacement

Obsolete, failing, or recalled panelboards replaced with modern equipment — with clean terminations, accurate schedules, and breakers you can actually buy replacements for. Cutover scheduled to minimize downtime for occupied buildings.

Code-Correction Work

Violations cited by City of Houston or Harris County inspectors, insurance carriers, or due-diligence reports — corrected, inspected, and documented. Grounding deficiencies, illegal splices, missing GFCI protection, overloaded circuits, and improper wiring methods.

Aluminum-Era & Legacy Wiring Replacement

Aluminum branch circuits from the 1960s and 70s, cloth-insulated conductors, and ungrounded two-wire systems replaced with modern copper wiring — eliminating the connection-failure and fire risks these legacy methods carry under modern loads.

Phased Rewiring of Occupied Buildings

Zone-by-zone rewiring engineered around business operations: night and weekend cutovers, temporary power for critical loads, and per-phase inspections so tenants keep working while the building is rewired beneath them.

When Existing Buildings Need Electrical Retrofit

Rewiring projects rarely start with a plan — they start with a symptom or a demand. Breakers that will not hold. A panel with no spare positions and a new tenant who needs twenty circuits. An insurance carrier inspection that comes back with a list. A renovation permit that pulls the whole electrical system into the current code. A property purchase where due diligence found aluminum branch wiring, and the lender wants it gone.

Our job is to turn that pressure into a defined, priced, and scheduled scope. We start with an assessment of the existing system — panels, feeders, branch wiring, grounding, and load — and tell you plainly which problems need full replacement, which need targeted correction, and which are cosmetic. Then we sequence the work around your operations, pull the permits under our TDLR license (#TECL18759), and close out every phase with the AHJ inspection that proves the correction is complete.

That documentation matters beyond the inspection itself. Corrected violations, updated panel schedules, and as-built records are what your insurance carrier, your buyer, or your next tenant's engineer will ask for — and buildings that have them lease and sell more easily than buildings that do not.

Why Houston Buildings Trust Us With Retrofit Work

Occupied-Building Experience

We plan cutovers for nights and weekends, protect finishes and inventory, run temporary power for critical loads, and leave every workday with the building operational. Facilities for clients like Frito-Lay, Plastipak, H.B. Fuller, and Valmont do not shut down for electrical work — and neither should yours.

Straight Answers on Scope

Not every aging building needs a full rewire. We tell you when a panel replacement, added circuits, or targeted corrections will genuinely solve the problem — and when they will not, we show you why on your own equipment, not with scare tactics.

Local Code Fluency

Our crews work with City of Houston and Harris County inspectors every week and build to the NEC amendments the local AHJs actually enforce — so correction work passes the first time instead of bouncing between re-inspections.

35 Years of Houston Buildings

Since 1991 we have worked inside the wiring eras that make up this market — from mid-century industrial buildings to 1980s office stock — and we know what each vintage hides above the ceiling before we open it.

Retrofit Scope, End to End

Rewiring projects usually pull related scope with them, and we self-perform all of it. Panel and breaker work runs through our breaker box wiring service; device replacement and new dedicated circuits through electrical outlet installation; and reworked workspace circuiting through our office electrical wiring service — one contractor, one schedule, one inspection trail.

For day-to-day service and troubleshooting in commercial buildings, our commercial electricians cover Greater Houston with 24/7 emergency response, and our electrical contractors page covers the full range of commercial and industrial work we take on. Call (713) 660-7344 to schedule an assessment of your building's electrical system.

Rewiring & Retrofit Experts

(713) 660-7344

Mon–Sat 7AM–5PM | 24/7 Emergency

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Related Services

Our Credentials

TDLR #TECL18759
Fully Bonded & Insured
In Business Since 1991
NFPA 70E Compliant

FAQ

Frequently Asked Questions

Can you rewire our building while we stay open for business?

In most cases, yes — phased rewiring is the core of how we approach occupied buildings. We survey the existing system, break the work into zones, and schedule circuit cutovers for nights, weekends, or planned windows so tenants and operations keep power through business hours. Temporary feeds carry critical loads during transitions, and each phase is inspected and energized before the next begins. Full shutdowns, when unavoidable, are scheduled and short.

What are the signs a commercial building needs rewiring?

Breakers that trip repeatedly under normal load, warm outlets or switch plates, flickering or dimming when equipment starts, buzzing from panels, scorched or discolored terminations, two-wire circuits with no equipment ground, and panels with no spare capacity are all warning signs. So is the building's age: cloth-insulated conductors, aluminum branch wiring from the 1960s and 70s, and obsolete panelboards were not designed for modern computing, HVAC, and equipment loads. An inspection tells you whether targeted correction or broader rewiring is the right answer.

How long does commercial rewiring take?

It depends on square footage, accessibility of the existing wiring, whether the building stays occupied, and how much of the distribution system is being replaced along with the branch circuits. A targeted correction — replacing a failing panel or rewiring one suite — can take days. A phased rewire of a fully occupied multi-tenant building is planned in stages over weeks or months, precisely so no single tenant is down for more than a scheduled window. We give you a phase-by-phase schedule with the estimate, not just an end date.

What code issues typically trigger required rewiring or corrections?

Common triggers in Houston-area buildings include missing equipment grounding on older circuits, abandoned or double-tapped conductors, overloaded panels and feeders, missing GFCI and AFCI protection where the current code requires it, improper splices outside boxes, and wiring methods that no longer meet the NEC as enforced by the City of Houston or Harris County. Renovation permits, changes of occupancy, insurance carrier inspections, and property transactions are the moments these deficiencies most often surface as required corrections.

Do we need a full rewire, or just a panel upgrade?

They solve different problems. If the branch wiring is sound but the panel is obsolete, failing, or out of capacity, a panel or service upgrade may be all the building needs — see our breaker box wiring service. If the conductors themselves are degraded, ungrounded, aluminum-era, or undersized for the load, new breakers cannot fix that and rewiring is the honest answer. We evaluate the whole system before quoting, so you are never sold a bigger scope than the building actually requires.

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