What to Buy Before Your Electrician Arrives (So You're Not Paying Them to Wait)
A mid-job parts run can cost you an hour of billed time plus retail markup. Here's how homeowners and small contractors pre-stage materials the right way: the universal list, project-specific lists, and the golden rule — confirm specs with your electrician first.
Confirm the spec list with your electrician, then order everything in one purchase before work starts. You supply the predictable materials (devices, fixtures, boxes, covers, often cable); your electrician typically prefers to supply code-critical components they warranty (panels, breakers, connectors) — ask. One order, one delivery, no billed parts runs.
The golden rule (read this before the lists)
Never order before the electrician confirms gauge, amperage, and quantity. The lists below are frameworks for the conversation, not substitutes for it. Two questions that prevent 90% of returns: 1. "Here's what I plan to supply — anything you'd rather supply yourself?" 2. "Can you give me exact specs: cable type/gauge, box sizes, device ratings?"
Some electricians prefer supplying everything (margin + warranty); many are happy to install owner-supplied fixtures and devices. Settle it at the quote stage.
The universal list (almost every job)
- Device boxes & covers — confirm size/depth; vapour-barrier boxes on exterior walls. Electrical boxes · Arlington boxes
- Wire/cable for planned runs — type and gauge per the electrician (NMD90 vs AC90 explained). Wire & cable
- Devices — switches, dimmers, receptacles, GFCIs in your chosen finish (decide white/black/nickel early — finish changes hold up jobs more than anything)
- Wall plates — same finish decision, counted with spares
By project: the pre-stage lists
Lighting renovation
Fixtures (recessed wafers, pendants, under-cabinet), compatible dimmers, fan-rated boxes for ceiling fans. Specs to lock: CCT (same per room), IC rating, dimmer compatibility. Guides: Recessed Lighting · Lighting Vibe Check.
Kitchen
Counter receptacles (GFCI where required), dedicated-circuit materials per appliance list, under-cabinet lighting, range hood. Lock the appliance spec sheet before the electrician quotes — an induction range can change the whole plan.
Bathroom
GFCI devices, exhaust fan (CFM sized to the room), vanity fixtures (damp-rated, high CRI), heated-floor thermostat if applicable.
Outdoor project
Weatherproof in-use covers, WR-rated devices, outdoor boxes, landscape lighting + low-voltage cable, photocell/timer. Arlington's outdoor line is the contractor standard — in-use covers · outdoor posts & GFCI supports. Background: Outdoor Outlets & Weatherproofing.
EV charger
The charger itself, breaker, cable/conduit per the run — full breakdown in the EV Charger Buyer's Guide. This is the project where pre-staging saves the most (chargers and 60A breakers are the classic "we'll come back Thursday" parts).
Heating
Baseboards sized to the room (sizing guide), matching thermostats (line-voltage, programmable or not), Ouellet heating.
Safety refresh
Smoke/CO alarms — interconnection type matters (hardwired vs wireless-interconnect); count every storey and sleeping area first (placement guide).
What to let the electrician supply (usually)
- Panels and breakers for service work — they'll match the panel brand and warranty the assembly (loadcentre brand-matching matters; breakers aren't interchangeable across brands by default)
- Connectors, fittings, consumables — they carry these and know exactly which
- Anything code-interpretive — if the electrician hesitates on a spec, that's their call to make
Why buy from a supply house instead of big-box
Stock depth (the right box, not the closest one), real spec sheets, trade-grade brands (the same Arlington, Leviton, and Siemens your electrician uses), counter staff who can cross-reference part numbers, and one consolidated order. Maple is an authorized reseller for every brand on the shelf — genuine stock, valid warranty, CAD pricing, fast ON/QC shipping, will-call pickup for the "need it today" moments.
Common pre-staging mistakes
- Ordering cable gauge from a guess instead of the electrician's spec
- Fixtures on site, but no compatible dimmers
- Forgetting wall plates (the universal last-minute trip)
- Mixed device finishes across rooms
- Buying the charger but not the breaker
- Not asking the electrician what they want to supply
Frequently asked questions
Will my electrician be annoyed if I supply materials?
Most are fine with owner-supplied fixtures and devices if specs are right — and annoyed by wrong materials. That's why the spec confirmation comes first.
Does owner-supplied material void anything?
Electricians warranty their workmanship; product warranties come from the manufacturer (and authorized-reseller purchases keep those valid). Some electricians won't warranty owner-supplied parts — normal and fair.
How much can pre-staging actually save?
A parts run = travel + store time at the hourly rate, plus retail pricing on whatever they grab. On multi-day jobs it compounds.
What if I order the wrong thing?
Confirm specs first and keep packaging intact. Maple's counter team cross-references part numbers before you order — send us the electrician's list.
Should I buy spares?
Yes: ~10% extra on devices and plates, one spare fixture per room type. Returns are easier than mid-job shortages.
- Electrical Safety Authority (Ontario) — homeowner guidance: esasafe.com
- Régie du bâtiment du Québec: rbq.gouv.qc.ca
- Manufacturer spec sheets for referenced product categories
Have your electrician's list? Send it to Maple — one quote, one delivery, ON/QC. Ask Maple
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