Electrical Estimating Services for Texas Contractors

Electrical pricing runs on a different problem than plumbing's city-by-city code split, but it's just as easy to get wrong in Texas. The Texas Department of Licensing and Regulation (TDLR) sets a statewide minimum National Electrical Code (NEC) edition, but individual cities are free to adopt a newer edition ahead of the state baseline - Houston, Dallas, and Austin have all moved to more current NEC editions before TDLR's statewide minimum caught up. An electrical estimate has to know which edition actually governs the jurisdiction, because demand load calculations, arc-fault and GFCI requirements, and EV-charging provisions have all changed meaningfully across recent NEC cycles.

Our electrical estimating services confirm the governing NEC edition for the project's jurisdiction before pricing service size, circuits, and load - not after the plan review comes back with a correction.

How an Electrical Estimate Is Built

Electrical, like plumbing, doesn't scale with square footage it scales with load. The estimate is built around:

• Service and demand load calculated per NEC Article 220 based on connected loads (lighting, appliances, HVAC, motors), which determines service size (amperage) and, in turn, a large share of total electrical cost.
• Panel and circuit design panel schedules, circuit counts, and breaker sizing quantified against the load calculation, not estimated by a flat per-square-foot circuit count.
• Conduit and wire sized by circuit and run length, with voltage drop factored in on longer runs, which matters more in Texas than in denser states given how often service runs cross larger lots and rural distances.
• Lighting and low-voltage fixture counts and low-voltage rough-in (data, security, controls) priced separately from power circuits, since they're frequently different scopes of work or different subs entirely.
• Service upgrades for renovation or tenant improvement work, existing service capacity is checked against new demand load before assuming the existing panel and service size are adequate.

Electrical by Project Type

Residential. Service sizing for single-family and multifamily, circuit counts matched to appliance load (including EV charging and standby generator provisions, both increasingly common in Texas), and lighting/low-voltage rough-in.

Commercial. Panel and switchgear sizing driven by occupancy load, lighting control requirements, and emergency/life-safety circuits priced to the demand a commercial occupancy actually places on the system, not a residential-scale assumption.

Industrial. High-voltage distribution (13.8kV/4.16kV class), motor control centers, and equipment-driven load calculations that look nothing like a building's lighting and receptacle load see our Industrial Construction Estimating Services page for how that scope is handled separately.

Why NEC Edition Matters to the Estimate

Two consecutive NEC editions can change requirements for GFCI/AFCI protection locations, EV charging infrastructure, and energy storage provisions all of which carry direct material and labor cost. An estimate built against the wrong edition either under-prices required protection (and gets kicked back at inspection) or over-prices scope the governing code doesn't actually require. Confirming the edition before pricing isn't a compliance footnote it changes the number.

Software and Standards

Electrical takeoffs are built in Bluebeam and Trimble/Accubid, with load calculations and circuit design checked against the National Electrical Code (NFPA 70) edition adopted by the project's jurisdiction, and priced against RSMeans and current Texas labor and material rates. We stay current with the TDLR Electricians Program baseline and local municipal adoptions.