Our Difference
Why Black Diamond Supply?
More than a big-box store. Faster than a wholesale counter. Three Phoenix locations stocked with everything you need to keep your project moving.
Counterless Shopping
Walk our floor, pull components directly off the shelf, and get back to the job. No waiting at a counter for a clerk to fetch your parts. No will-call line. No wasted time.
Most electrical supply houses make you stand at a counter while someone disappears into a warehouse. We built our stores so you can walk the floor yourself — see what's in stock, grab what you need, and go.
More Depth Than Big-Box
Home Depot and Lowe's carry the basics. We carry the basics plus the specialty items, the commercial-grade parts, and the hard-to-find components that keep your project from stalling.
When the big-box store is out of the breaker you need or doesn't carry the conduit body you're looking for, Black Diamond Supply is your next call — and usually your last one.
Staff Who Know Electrical
Our team knows the difference between a 15A and 20A circuit, between EMT and rigid, between a tandem breaker and a double-pole. Ask us anything.
We're not generalists. Our staff is trained on electrical — so when you have a question, you get a real answer, not a shrug.
Competitive Pricing
Fair pricing on everything from wire nuts to 200A panels. No membership required, no minimum order, no games.
We price competitively against both big-box and traditional wholesale. Contractors get the same pricing transparency as homeowners — no hidden tiers.
Three Phoenix Locations
1146 E. Northern Ave. (Northern & 12th St), 922 S. 19th Ave., and 2711 W. Indian School Rd. — three fully stocked locations across the Valley.
Northern & 12th St serves the central and north Phoenix corridor. Our 19th Ave location covers the west side and is the only location open Saturdays 7AM–11AM. Indian School Rd. puts us right in the heart of the Valley for easy access from all directions. Every location carries a similar deep inventory.
Extended Hours at 19th Ave
Our 19th Ave location is open Monday–Friday 7AM–4PM and Saturdays 7AM–11AM — so you can grab what you need before the weekend job starts.
Late-running jobs, last-minute material needs, or just a long day on the tools — our 19th Ave store is open when most supply houses are closed.
Side by side
How We Stack Up
From the field
What Contractors Say
"I've been coming here for years. The staff actually knows what they're talking about, and I can walk the floor and grab exactly what I need without waiting at a counter. Saves me at least 30 minutes every trip."
Mike R.
Licensed Electrician, Phoenix
"Home Depot didn't have the breaker I needed. Black Diamond had it on the shelf. That's the difference — they stock the stuff that actually matters for real jobs."
Carlos T.
Electrical Contractor, Scottsdale
"The 19th Ave location's late hours are a lifesaver. I've picked up materials at 9PM when I realized I was short on a job. No other supply house does that."
Dave M.
Handyman, Glendale