SteelBuildingKit Cost Index · Updated July 10, 2026 · Pricing collected June-July 2026
Wiring a metal building costs $3,000 to $6,000 for a 100-amp service and $5,000 to $9,000 for a 200-amp service, plus $2 to $4 per square foot for LED shop lighting and $250 to $900 per dedicated equipment circuit (modeled national ranges, July 2026). A 30×40 shop wired for real work, with 200-amp service, lighting, receptacles, and welder and compressor circuits, typically lands between $9,000 and $18,000.
Electrical is the planning line that punishes procrastination hardest, because the cheap moment to run wire is while the ground is open and the walls are bare. This guide, part of our project planning hub, prices the whole scope: service size, lighting, the circuits your equipment actually draws, and the trench-while-open rule that saves four figures on almost every project.
| Scope | What it covers | Range modeled | Best fit |
|---|---|---|---|
| 100-amp service | Panel, meter, service run, grounding | $3,000 – $6,000 | Lights, outlets, small tools |
| 200-amp service | Panel, meter, service run, grounding | $5,000 – $9,000 | Welders, compressors, lifts, HVAC |
| LED shop lighting | Fixtures, wiring, switching | $2 – $4 /sqft | Every workspace |
| Receptacle package | General 120V outlets on walls and GFCI | $1,000 – $2,500 | Any working shop |
| Equipment circuits | Dedicated 240V runs, breaker to outlet | $250 – $900 each | Welder, compressor, lift, EV |
Modeled national mid-ranges, July 2026, for a new detached metal building with the utility meter or house panel within a normal residential distance. Long service runs, rural line extensions, and finished-wall retrofits price above these bands.
Ranges are modeled national estimates built from published electrical contractor pricing and advertised service-installation rates collected June-July 2026, cross-checked against component benchmarks: panel and breaker hardware, conduit and copper by the foot, and regional electrician labor. Figures are labeled modeled because service-run distance and local utility fees move quotes more than any hardware list. Full methodology lives in the SteelBuildingKit Cost Index.
The 30×40 shop wiring worksheet
Here is the full electrical budget for the most common shop size, line by line, the way an electrician’s proposal reads. Scale the lighting and receptacle lines with your own floor; the service line barely moves with building size.
| Line item | Typical range modeled | Notes |
|---|---|---|
| 200-amp service and panel | $5,000 – $9,000 | Meter, mast or feed, panel, grounding |
| LED lighting, 1,200 sqft | $2,400 – $4,800 | $2 – $4/sqft, switched in zones |
| Receptacle package | $1,000 – $2,500 | Wall outlets every 8-12 ft plus GFCI |
| Welder circuit, 240V 50A | $300 – $900 | Breaker, wire run, receptacle |
| Compressor circuit, 240V 30A | $250 – $700 | Dedicated run to the compressor corner |
| Working shop total | $8,950 – $17,900 | Permits and inspection usually inside these lines |
Worked example at national mid-range rates: a $7,000 200-amp service, $3,600 of lighting ($3/sqft), $1,500 of receptacles, a $600 welder circuit, and a $450 compressor circuit comes to $13,150. Dropping to 100-amp service saves roughly $2,000-$3,000 but caps what can run at once. The steel building cost calculator carries an electrical line, so this worksheet can ride along with your building estimate instead of surprising you after it.
100 amps or 200: pick by your worst hour
Service size is not about the building; it is about the worst hour of simultaneous load you will ever ask of it. Write the list: a 240V welder wants a 50-amp circuit, a 5-horsepower compressor wants 30, a car lift wants 20-30, a mini-split wants 15-30, an EV charger wants 30-60. A 100-amp panel handles lights, outlets, and any one of those at a time, which suits storage buildings and light hobby shops. The moment two big loads can run at once, and in a real shop the compressor kicks on whenever it pleases, you want 200 amps.
The economics push the same direction. Upgrading from 100 to 200 amps at build time costs $2,000-$3,000; replacing a 100-amp service later costs nearly the full $5,000-$9,000 again, because the panel, service conductors, and often the trench all get redone. Buy the panel your five-year plan needs, not the one this month’s tool list needs.
The trench-while-open rule
One rule saves more money than any other on this page: put conduit in the ground while the ground is already open. Power to a detached building travels in a trench, and that trench is nearly free when the site is being graded and the slab has not been poured. Dig it later, through compacted drive, landscaping, or worse, through the slab, and the same run costs four figures more. Coordinate the electrician and the concrete crew so the service conduit, and any under-slab runs to a future car lift or floor outlet, are stubbed in before the pour; our concrete slab cost guide covers what pour day should include. While the trench is open, drop in a spare conduit or two. An extra $100 of empty pipe is the cheapest insurance in construction: it carries the future welder circuit, the gate opener, or the fiber line without a shovel touching the ground again.
Configuration levers and what they cost
| Option | Typical impact modeled | Worth it when |
|---|---|---|
| 200-amp over 100-amp service | +$2,000 – $3,000 at build time | Any two big loads can run at once |
| Long service run from meter | +$1,000 – $3,000+ | Building sited far from power; trench and wire by the foot |
| Subpanel fed from the house | $1,500 – $3,500 instead of new service | Building near the house, modest loads |
| High-bay LED fixtures | Top of the $2 – $4/sqft band | Eaves 14 ft and up |
| Extra 240V circuits at rough-in | +$250 – $900 each | Cheapest they will ever be |
| EV charger circuit | +$500 – $1,500 | Any vehicle plans within 5 years |
Wiring for shop equipment
Equipment circuits are cheap individually and expensive collectively if nobody plans panel space for them. Price the circuit and the machine together so the panel, the wire, and the breaker are sized once.
| Equipment | Circuit cost modeled | Notes |
|---|---|---|
| MIG/TIG welder, 240V 50A | $300 – $900 | Locate near the fabrication bay door |
| Air compressor, 240V 30A | $250 – $700 | Compressed-air piping adds $2,000 – $5,000 for a plumbed shop |
| Two-post car lift | $400 – $900 | Lift itself runs $3,000 – $6,000 per bay |
| EV charger, 240V 30-60A | $500 – $1,500 | Run the conduit even if the charger waits |
| Mini-split heat pump | $300 – $800 | Coordinate with the HVAC installer |
Circuit prices assume open walls at rough-in, July 2026. Fishing wire through insulated finished walls can double these figures.
A pattern worth noticing: every circuit in that table costs two to four times more after the walls are finished. If a machine is even on your someday list, run its wire now or stub a conduit to its corner. Our workshop cost and sizes guide shows how the electrical package fits inside the full shop budget.
How your location moves these numbers
Location moves electrical mostly through labor and distance. Metro electrician rates run 30-50% above rural ones, which alone swings a full shop package $1,500-$3,000. Distance from existing power is the wildcard: a building sited 300 feet from the meter pays for every foot of trench and conductor, and a rural site needing a utility line extension can add four figures before the panel is even hung. Permits and inspection run $150-$4,000 for the overall project depending on county, with the electrical permit usually a modest slice of that. The same climate that adds 8-15% to a kit for snow and wind also nudges electrical: heated shops in cold counties tend to buy 200-amp service for HVAC loads, and freight at $500-$3,000+ applies to the building, not the wiring, but lands on the same project budget. Plan the meter-to-building distance early; it is the one electrical cost you control with a site plan.
The electrical quote checklist
- Service size stated in writing, with panel brand, breaker spaces, and main breaker rating
- Service-run distance measured on the site plan, with trench and conductor priced by the foot
- Conduit scheduled before the slab pour, with spare conduits listed as a line item
- Lighting quoted per fixture and per square foot, with zones and switching shown
- Dedicated circuits itemized by equipment, voltage, and amperage, not lumped as “outlets”
- Building steel bonding and grounding electrode work included per code, in writing
- Permit and inspection fees named, and who pulls the permit stated
- Panel space left for at least two future 240V circuits
Readers comparing options usually open heating and cooling budget and plumbing cost next; both follow the same July 2026 cost model.
Metal building electrical FAQs
How much does it cost to wire a 30×40 metal building?
Plan on $9,000-$18,000 for a working shop: 200-amp service ($5,000-$9,000), LED lighting ($2,400-$4,800), receptacles ($1,000-$2,500), and dedicated welder and compressor circuits (modeled July 2026). A storage-only building on 100-amp service with basic lights can come in near $5,000-$8,000.
Is 100 amps enough for a metal shop?
Enough for lights, outlets, and one big machine at a time. The honest test is your worst hour: if a welder, compressor, lift, or heat pump can ever run together, buy 200 amps for $2,000-$3,000 more at build time. Replacing a 100-amp service later costs nearly the full $5,000-$9,000 again.
Can I run power to a metal building from my house?
Often, yes. A subpanel fed from the house panel runs $1,500-$3,500 (modeled July 2026) when the building is close and the house has spare capacity. It caps your loads at what the house service can share, so it suits garages and light shops better than welding shops. Beyond modest distance or load, a separate service prices better.
What does shop lighting cost in a metal building?
$2-$4 per square foot installed for LED shop lighting (modeled July 2026): about $2,400-$4,800 on a 30×40, $4,800-$9,600 on a 40×60. Taller eaves push toward high-bay fixtures at the top of the band. Switch it in zones; lighting half a shop costs half as much to run.
Do metal buildings need special grounding?
They need code-standard grounding done properly: a grounding electrode system and bonding of the building steel per the NEC. It is routine work for any licensed electrician and typically lives inside the service price, but confirm it is written into the quote. Skipped bonding is a common red-tag on metal building inspections.
When should electrical conduit be installed?
Before concrete, every time. Service conduit goes in the open utility trench during site work, and any under-slab runs (car lift, floor receptacles, future circuits) get stubbed before the pour. The same runs cost 2-4x more after the slab and walls are finished, which is why the trench-while-open rule is the cheapest advice in this guide.
Ready to price this building for real? Compare verified metal building companies for this project type, with real reviews and track records.
Sources and methodology: published supplier price lists and advertised electrical contractor pricing (June-July 2026); component cost benchmarks for ready-mix concrete, erection labor, and freight; IBC and ASCE 7 for load context. All figures are modeled national estimates, labeled as modeled, and reviewed quarterly; see the full Cost Index methodology. This guide links to our independent company directory; listings never change published numbers.
Written by the Steel Building Editorial Team | Last updated July 10, 2026
