Electrical cost per square foot for commercial buildings
Electrical cost per square foot for commercial buildings depends mostly on building type. RSMeans' 2025 project cost data, which includes the contractor's overhead and profit, puts the national median electrical cost at $29.00 per square foot for office buildings, $18.95 for retail, $33.00 for schools, $22.50 for warehouses and $62.00 for hospitals.1 Use figures like these for budgets and checks; use a real takeoff for a hard bid.
Electrical cost per square foot by building type
The most complete public source we found is the Project Costs table that Gordian publishes with its RSMeans square foot data. It breaks 28 building types into architectural, plumbing, mechanical and electrical costs per square foot, with first quartile, median and third quartile for each.12 In the 2025 edition, adjusted to January 2025 and including the contractor's overhead and profit, the median electrical cost is $29.00 per square foot for office buildings, $18.95 for retail, $33.00 for schools, $22.50 for warehouses and $62.00 for hospitals.1
For every building type, the quartiles and electrical's share of total cost, see the RSMeans 2025 Project Costs table (PDF). Gordian lists it on its 2025 cost book updates page.
How to read these numbers
RSMeans explains how its table is built, and the notes matter as much as the numbers.1
- The figures come from hundreds of completed projects in the RSMeans database, located throughout the U.S., and include the contractor's overhead and profit.
- They are adjusted to January of the data year, here January 2025.
- Each column was tabulated separately, so the figures do not add up. The median electrical cost of offices plus the median mechanical cost will not equal the median of their combined cost.
- RSMeans recommends the median for preliminary figures, multiplied by the city cost index and by a project size modifier, then adjusted for the estimator's experience, local conditions, code requirements and the owner's requirements.
- The table is meant for the conceptual stage. In RSMeans' words, as soon as details become available the square foot approach should be discontinued and the project priced by its components.
- The table does not say which systems the electrical line includes. Do not assume fire alarm, data or security are in or out.
To bring a January 2025 figure closer to today, RSMeans publishes a historical cost index: 293.9 in January 2025 and 314.5 in July 2026.23 That index covers construction as a whole, not electrical work alone, so treat the adjustment as approximate.
Adjusted $/SF = published $/SF x (current index / index of the data date) = published $/SF x (314.5 / 293.9)
What drives electrical cost per square foot
A dollars per square foot figure is an average over very different buildings. In the RSMeans table the spread inside a single type is wide: for industrial buildings and warehouses, the third quartile is several times the first.1 These are the usual reasons two commercial jobs of the same size land far apart, and what to do about each one when you use your own history.
| Driver | Why it moves cost | How to adjust your history |
|---|---|---|
| Building type and use | Use sets the baseline: a warehouse and a hospital of the same area carry very different lighting, power, emergency systems and gear. | Never compare across types. Keep a separate history for each building type and pick the closest one. |
| Lighting density and controls | Fixtures per 1,000 SF, fixture type and the controls package (sensors, dimming, networked controls) move the lighting share more than anything else. | Record fixtures per 1,000 SF on every job. Scale the lighting part of your $/SF by the new job's density against the historical one. |
| Power density | Receptacles, equipment connections, dedicated circuits, kitchen and lab equipment, floor boxes in open offices. | Record devices per 1,000 SF and adjust the power and branch part of your history the same way as lighting. |
| Service and distribution | Service size, number of panels and transformers, emergency power, generators and transfer switches. Gear is a fixed cost that does not shrink with the floor plate. | Keep gear out of your $/SF and price it separately from the one-line, as a lump sum per job. |
| Fire alarm and low voltage scope | Whether fire alarm, data, security and AV are in the electrical number or bid by others. Identical power and lighting can still give very different totals. | Store systems as their own line. Add them back only when the new job includes them. |
| Region, labor market and union status | Labor is a large share of electrical cost, so wage rates and productivity carry straight through to $/SF. | Split history into labor hours and material. Reprice the hours at today's composite rate for the market you are bidding. |
| New construction or renovation | Demolition, make-safe work, existing conditions and work in occupied space add labor that new construction does not carry. | Keep renovation jobs in a separate history; do not mix them into a new-construction average. |
| Size, shape and schedule | Smaller buildings spread fixed costs over fewer square feet. Compressed schedules and phasing raise labor and general conditions. | Compare against jobs of similar size, and carry schedule-driven costs as job costs, not inside $/SF. |
| Date of the data | Material and labor prices move every year, so an old $/SF understates today's cost. | Escalate each job from its midpoint date with a cost index before averaging. |
Vermeulens, a cost consulting firm, makes the same point from the owner's side: MEP cost follows how densely systems are laid out, not floor area, and location can move a project by up to 40%. It also notes that hard bid and negotiated delivery can differ by close to 15% on first cost.4
Two of those drivers deserve their own workflow. Gear is sized from the load, so run the NEC Article 220 load calculation worksheet before you price a new service as a lump sum. Systems scope is the other: when data, security and AV are yours, the low voltage estimating guide shows how to take them off as a separate line, and rooftop PV belongs outside the building $/SF as well, priced from its own solar takeoff and estimate.
How to build your own electrical $/SF from past jobs
Published tables are a starting point. The number you can actually trust is the one built from your own finished jobs, with your labor rates, your productivity and your definition of scope. Building it takes an afternoon per year of job history.
- Pick the jobs. Use completed jobs with final job cost, or bids you won and built close to estimate. Separate new construction from renovation.
- Use one scope definition. Split out fire alarm, low voltage, site lighting, generators and owner-furnished equipment so every job measures the same thing.
- Split by system. Record lighting, power and branch, gear and feeders, and systems separately. A total hides which part was unusual.
- Use gross square feet from the drawings, measured the same way on every job.
- Bring old jobs to today with a cost index, using the job's midpoint date.
- Group by building type and keep the low, middle and high, not only the average.
- Add density metrics from your takeoffs: devices per 1,000 square feet and fixtures per 1,000 square feet explain most of the spread within a building type.
Electrical $/SF = final electrical cost (or contract value) / gross square feet
Device density = devices counted / (gross square feet / 1,000)
| Field | Why it matters |
|---|---|
| Job, year, location | Lets you escalate and compare markets |
| Building type, new or renovation | The first filter for any comparison |
| Gross square feet | The denominator; measure it the same way every time |
| Lighting, power, gear, systems ($) | Shows which system made a job expensive |
| Labor hours and hours per 1,000 SF | Separates productivity from material price changes |
| Devices and fixtures per 1,000 SF | Explains why two offices of the same size cost different amounts |
| Service size and scope notes | Records what was in and out, so next year's comparison is fair |
When $/SF is fine, and when it isn't
Gordian puts square foot estimates at roughly 20% of final cost, systems and assemblies estimates within 10 to 15%, and unit price estimates within 10%.5 On a competitive electrical bid, where margins are thinner than that range, the difference decides whether the job makes money.
| Situation | Use $/SF? | Why |
|---|---|---|
| Owner or GC asks for a budget before drawings | Yes | Nothing to count yet. State the basis and give a range, not a single number. |
| Design-build or design-assist at schematic design | Yes, then replace it | Move to assemblies as soon as layouts exist. |
| Go or no-go on an invitation | Yes | A quick size check tells you if the job fits your crews and bonding. |
| Checking a finished detailed estimate | Yes | A result far outside your history points to missed or doubled scope. |
| Hard bid on complete drawings | No | The drawings tell you exactly what is there. Count it and price it. |
| Change orders | No | Price the actual added or deleted work. |
For the full bidding side, including the case for and against bidding by the square foot, read how to bid electrical jobs. For the detailed method that replaces $/SF on a hard bid, read the electrical estimating guide; the assemblies and labor units that method runs on usually live in commercial electrical estimating software. If the bid is due before you have the hours to count a full set, an outside electrical estimating service is a safer fallback than a $/SF number.
A quick budget, the right way
When a budget is all that is asked for, build it in parts instead of using one number. Take your own history (or the RSMeans quartiles if you have no history for the building type), pick the low, middle or high figure based on what you know about the design, and adjust for scope you know is in or out. Then send a range with the assumptions written down: building type, area, scope included, data date. The construction cost estimator and the electrical estimate calculator run the arithmetic in your browser, next to the other electrical calculators for fill and voltage drop.
Where AmpCount fits
The density metrics that make a $/SF history useful come from device and fixture counts. AmpCount produces those counts from the legend on a vector PDF set, sheet by sheet, and exports them per drawing, so a devices per 1,000 square feet figure is a division away. When the drawings are complete enough to count, the same counts are the start of a detailed estimate, which is the point where $/SF should step aside.
Questions
What is the average electrical cost per square foot for a commercial building?
There is no single average that means much, because building type dominates. In RSMeans' 2025 data the electrical median is $22.50 per square foot for warehouses, $29.00 for offices and $62.00 for hospitals, including overhead and profit.1
Why do websites quote such different electrical costs per square foot?
They measure different things: different building types, scopes (with or without fire alarm, low voltage or gear), dates, regions, and whether overhead and profit are included. Before using any figure, check what it includes and when it was measured.
What percentage of a commercial building's cost is electrical?
It varies by building type, and RSMeans reports it for each type in its Project Costs table (the percentage columns of the PDF linked above). For your own work, divide the electrical contract by the total construction cost on jobs where the GC shares it, and keep the result next to your $/SF history.
Can I use RSMeans numbers for a bid?
Not the square foot table. RSMeans itself says the square foot approach should be discontinued once design details are available. Use it for budgets and as a check.1
Count the devices, check the numbers
AmpCount reads the legend on a vector PDF set, counts every electrical device and fixture on every sheet, keeps uncertain marks out of the count until you confirm them, and checks fixtures against the schedule. $149 a month or $1,490 a year for a team of up to 3, cancel anytime, full refund within 14 days.
Keep reading
Sources
- RSMeans (Gordian), 2025 Project Costs per square foot, 50 17 00 (PDF)
- RSMeans, 2025 Cost Book Updates (historical cost index, January 2025)
- RSMeans, 2026 Cost Book Updates (historical cost index, July 2026)
- Vermeulens, The Pitfalls of Dollar per Square Foot Estimating (August 14, 2019)
- Gordian, Construction Estimates: An Overview of 4 Common Types (September 22, 2022)
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