Planning a Commercial Electrical Service Upgrade in Houston
Many Houston commercial buildings were wired for a different era. A strip center built for dry retail, an office building designed before every desk had two monitors, or a warehouse that now needs electric forklifts and more cooling can all run out of electrical capacity. When a new tenant, a restaurant conversion or new equipment pushes past what the existing service can carry, the owner faces an electrical service upgrade.
An electrical upgrade is not only an electrician's job. It touches the utility, the permit office, the structure, the roof, the parking lot and every tenant who loses power during the cutover. This guide walks through the planning steps so owners, tenants and property managers can see the whole project. It is general information; your electrical engineer and electrical contractor design the actual system.
Signs the building needs more capacity
Owners usually discover a capacity problem in one of a few ways:
- A prospective tenant's engineer reports that the space cannot support their equipment.
- Breakers trip when the building is fully occupied on hot afternoons.
- Rooftop HVAC replacements call for larger units or different voltages.
- An insurance or property condition report flags aging switchgear or panels.
- A use change, such as retail to restaurant or office to medical, adds kitchen, imaging or refrigeration loads.
If you are replacing rooftop equipment at the same time, our guide to commercial rooftop HVAC replacement planning covers the roof and structural side of that work.
Step 1: Get a load review
Before anyone orders gear, an electrical engineer should review the building's existing service, metering and panel schedules and calculate the loads the new use will add. The review should answer basic questions: Is the existing service large enough with some reorganization, or does the building need a bigger service? Does each tenant have its own meter? Are there old panels or switchgear that should be replaced while the power is off anyway?
Ask the engineer for a short written summary you can share with tenants, brokers and bidders. It becomes the backbone of the scope.
Step 2: Talk to the utility early
In much of the Houston area, CenterPoint Energy owns the distribution lines and transformers that feed commercial buildings. A larger service may require a new or larger transformer, a different metering arrangement or new service conductors, and the utility has its own design and scheduling process. CenterPoint's business customer pages are the starting point for service requests and contacts. Starting this conversation early matters, because utility design and equipment lead times can drive the entire project calendar.
Step 3: Understand the permits
In the City of Houston, electrical work is permitted and inspected by Houston Public Works. The city's Circuit Panel Permit page explains that registered electrical contractors who install or re-wire circuit breakers must request an electrical permit, and that plan review and inspection are required. If the building needs power during construction before final inspection, the city's Temporary Cut-In Permit page describes how temporary service is handled.
When the upgrade is part of a tenant buildout or remodel, the electrical permit usually sits alongside a building permit, such as a Buildout Permit or Commercial Remodel Permit. Outside city limits, check with the county or the city that has jurisdiction.
Step 4: Know which code applies
Electrical design in Texas is based on the National Electrical Code, published by the National Fire Protection Association as NFPA 70, with local amendments. Your engineer and electrical contractor will confirm which edition and amendments the local authority enforces. For worker safety around energized equipment, contractors follow NFPA 70E and OSHA's electrical safety requirements.
Step 5: Plan the building work around the gear
New electrical equipment needs a home. That often means construction work beyond the wiring:
- Electrical room changes. Larger switchgear may need a bigger room, new walls, a rated door or added clearance in front of the equipment.
- Concrete pads. Transformers and exterior gear typically sit on concrete pads, which may need new bollards for protection from vehicles.
- Trenching and paving. Underground conduit from the utility to the building means cutting and patching parking lots, sidewalks or landscaping.
- Wall and roof penetrations. New feeders and service entrances need sealed, flashed penetrations so the upgrade does not create a leak.
- Ceilings and finishes. Running new branch circuits through occupied suites means opening and patching ceilings and walls.
Our commercial parking lot repair options guide is useful when trenching crosses paved areas.
Step 6: Plan the shutdown
The cutover from old service to new usually requires a planned outage. For occupied buildings, the shutdown is the most sensitive part of the project. Good planning includes:
- Written notice to every tenant with the date and expected duration.
- Scheduling the outage at night or on a weekend.
- Temporary generators for tenants with refrigeration, servers or medical equipment.
- A walk-through the day before with the electrical contractor, the utility and building staff.
- A restart checklist for elevators, fire alarm panels, HVAC controls and access systems.
Temporary generators may need their own permit; the city's Generator Permit page explains the requirements. Our guide to after-hours commercial construction in Houston covers night and weekend work in occupied buildings.
Step 7: Think about future loads
An upgrade is the best time to plan ahead. Ask your engineer about spare capacity, space for future panels and conduit for electric vehicle chargers, solar or battery storage. A few empty conduits installed while the parking lot is open are far easier than trenching again later. Separate metering for each tenant can also make leasing and utility billing simpler.
Step 8: Write a scope that bidders can price
A clear bid package separates the electrical engineering, utility work, electrical contractor scope and general construction items like pads, trenching, patching and finishes. It names who coordinates with the utility, who pays utility charges and who handles tenant notices. Our commercial bid comparison guide shows how to line up bids on the same scope.
Frequently asked questions
Who is responsible for the upgrade, the landlord or the tenant?
It depends on the lease and the work letter. Base building service is often the landlord's responsibility, while tenant-specific loads may be the tenant's. Review the lease with your broker or attorney.
Can the building stay open during the upgrade?
Usually, except for a planned shutdown during the cutover. Careful phasing keeps the outage short.
What drives the schedule?
Utility design and equipment lead times are often the longest items, followed by permitting and the shutdown window.
Planning an electrical service upgrade and the construction work around it? BPC Development LLC provides free on-site estimates in Houston, TX. Call (281) 301-4737.