Switching Supply Houses: The Real Cost for Contractors

Switching supply houses costs a contractor more than the price difference on the quote that started the conversation. The money is real, and it is spread across five places nobody puts in the comparison: a new credit application and a reset payment history, a pricing agreement rebuilt category by category, an estimating price file that has to be re-pointed, a counter and will-call crew that no longer knows your trucks or your job numbers, and whatever sits on the old account as open returns, special orders and stocked items bought for you.

None of that means you should stay. Sometimes moving is clearly correct, and the willingness to move is one of the few levers you have. But the honest math is not “their wire is 8% cheaper.” It is “their wire is 8% cheaper, and here is the six-month bill for getting there.”

The short answer: what switching supply houses actually costs a contractor

Five buckets, roughly in order of how badly they bite:

Credit and terms reset. A new account means a new credit application. Your line and terms are set by the new house’s credit department on their read of you, not on the ten years of clean payment history sitting at your old house. That history does not transfer, and nothing obliges them to honor it.
Pricing agreement rebuild. Negotiated rates are per category and per part, held in the distributor’s ERP. Day one you are on the new house’s standard book, not your old net prices, until someone loads the agreement and gets manufacturer support behind it.
Estimating and price file rework. If your estimating software pulls net pricing from a distributor feed, that feed is scoped to the distributor. Change houses and the file has to be re-pointed and re-checked.
Counter, will-call and delivery familiarity. The soft one, and the one that hurts at 6:40am on a Tuesday. The new counter does not know your job numbers, your PO conventions, who is allowed to sign, or that your service guys need the 3/4 inch stuff in the back cage.
Stranded inventory and open items. Special orders, cut wire, non-stock items brought in for you, and anything you meant to return. That is where a switch turns an annoyance into a write-off.

Credit and terms: the reset nobody prices in

Your payment reputation is account-scoped. You built it at one distributor and it stays there. The new house runs its own credit application, sets an initial line, and often sets it lower than the line you had. If you buy $60,000 of material in a heavy month and your new line is $25,000, the switch quietly becomes a cash flow problem: you either pay down mid-month to free up room, or you split orders back to the house you were trying to leave, which defeats the point.

Two moves reduce this. Ask for the line and terms in writing before you move a dollar of volume: not “we’ll take care of you,” but a number and a term, from the branch manager and their credit department. And bring your own evidence. Twelve months of paid invoices, your average monthly spend and your average days to pay make a stronger credit file than the blank application they hand you.

Pricing: what does not travel with you

Your price at a distributor is a stack of rules rather than one number, and almost none of the stack is portable.

A contractor agreement in an electrical distributor’s ERP is typically built as category-specific percentage discounts off list: one discount on lighting fixtures, another on wire and cable, another on breakers and panels, plus matrix pricing and override management on top. That is why a headline “we’ll beat them by 10%” is close to meaningless. Ten percent on what category? The one you actually buy, or the one they wanted to lead with? The tiers underneath, and the arithmetic that turns them into your net, are worked through in column pricing at an electrical distributor.

The part that takes months, not weeks, is manufacturer support. A special pricing agreement lowers the distributor’s effective cost on specific products, often for a specific contractor or job. Enable describes SPAs as rebates that return money up the supply chain after the sale, also called ship and debit or vendor chargeback. Critically for a switch, SPAs are static rather than dynamic, negotiated per product and per customer. They do not follow you across the street. Somebody at the new house has to go get them, line by line. A contractor on the Mike Holt forums put it plainly: “One of the things that many contractors don’t realize is they need to establish accounts with the supply houses and have them set up SPA prices with the manufactures. This will give you much better pricing. The SPA prices are less that the suppliers cost for many items.” That is the work item, and it is exactly what quietly does not happen if nobody chases it.

Your estimating software is downstream of all of it. NetPricer feeds electronic pricing into estimating packages, but only for products your distributor feeds to the service on your behalf, off catalog and list data from managed sources like Trade Service, now part of Trimble. Change houses and someone has to re-point that file and spot-check it, or you will bid a month of work off stale net prices.

The volume problem: why splitting your spend can cost you more than staying

The most common version of “switching” is not switching. It is adding a second house and splitting the buy. Often the right first step, but understand what it does to your leverage.

Distributor pricing runs on customer classification and volume. Distributors price from published and in-house sheets with columns showing several gross profit percentages, plus customer classification buckets and blanket pricing. Cut your spend at House A in half and you may drift down a bucket. Arrive at House B with half your spend and you may not clear the threshold for the bucket you wanted.

A contractor doing “$100,000+ per year” with one wholesaler reported good pricing but added that “trying to get multiple wholesalers to that discounted rate, is difficult being a smaller company.” That is the trade-off: concentration buys you rate, diversification buys you a check on that rate.

There is also a group layer you may be sitting inside without knowing. Electrical Wholesaling has reported 32.2% of electrical distribution sales moving through buying and marketing group members, and Affiliated Distributors alone reports over 1,000 independent distributor members and over 9,000 locations. So two independents across town from each other may buy through the same program, which means the gap you are chasing may be a margin decision rather than a cost advantage. Margin decisions are negotiable without you moving anything.

Stranded items: returns, cut wire and special orders

This is the bucket that becomes an actual write-off, and the easiest one to avoid by sequencing the move correctly.

Published return policies are stricter than most shops remember until they need one. Two set a minimum 25% restocking fee on approved returns, with no returns on cut wire or non-stock items. Others publish a minimum 15% fee with the same exclusions plus a window measured from delivery. The numbers vary by house, the shape does not, and the exclusions cost more than the percentage. Full picture: how supply house restocking fees work.

Before you move volume, close the loop on the old account:

Return everything returnable while you are still an active customer. Goodwill on a return request drops the moment your buying stops.
Take delivery of, or formally cancel, every open special order. A non-stock item ordered for you does not stop being yours because you left.
Chase every open credit to a posted credit memo, not a promise. “We will issue you a credit” is a to-do item, not a transaction. Use the supplier credit request email template and get it in writing.
Reconcile the final statement line by line. Errors on a closing account are harder to fix than errors on a live one.

A switching cost worksheet

Fill this in with your own numbers. The point is the line items, which are the ones that get left out of the comparison.

Cost line	Where it shows up	How to shrink it
Credit line lower than your peak month	Cash flow, split orders back to the old house	Get the line and terms in writing before moving volume
Weeks on standard book pricing	Higher net on every category until the agreement loads	Require the agreement loaded and verified before the first PO
Missing SPA support on your top part numbers	Net price above what was quoted, quietly	Hand them a top-50 SKU list and ask which lines are SPA-backed
Estimating price file re-point and audit	Bids off stale net prices	Re-pull the file and spot-check 20 SKUs against a live quote
Counter and will-call learning curve	Wrong material, wrong job number, extra truck trips	Written PO and job number convention, one named inside rep
Restocking fees on old-account returns	Straight loss, 15% to 25% minimum by published policy	Return before you move, not after
Non-returnable cut wire and special orders	Straight loss	Close or take delivery of all open orders first
Delivery route and cutoff differences	Missed morning deliveries	Confirm cutoff times and route days in writing
Rebuilding your price baseline	You lose the ability to spot drift for months	Export your invoice history before you go quiet

That last row is the one most shops discover late. Detecting material price creep depends on having a per-SKU history. Move houses without exporting yours and you restart the baseline at zero, which is exactly the condition in which a new supplier’s prices drift unnoticed for two quarters.

Run the test before you move the account

Do not switch on a quote. Quotes are chosen to win the conversation.

Pick 20 to 30 SKUs you actually buy. Not the ones they want to quote. Your top movers by dollar volume and by line count, which are usually different lists.

Price the same basket at both houses, same day. Same manufacturer, same part number, same unit of measure. Unit of measure is where these comparisons break: a price per foot against a price per 250 foot roll is not a comparison.

Check the quote for omissions, not just prices. On gear and lighting packages this matters enormously. One contractor described the pattern: “One trick they play is to " forget" to put fuses in disconnects, include lamps and other things. This way they look lower at first but when you build the job when you add in the fuses or lamps they are higher.” Scope the quote before you compare the number.

Then compare invoices, not quotes. Buy from the challenger on two or three real jobs and check what got billed. That is the argument of quote versus invoice mismatch: the quote is a marketing document until the invoice agrees with it.

Expect spread, and do not read it as bad faith. The same poster also noted that “Electrical supply houses have different prices for just about everyone. I have seen them charge everything from 15% of list all the way up to list price for the same item to different customers.” Price varies by account because agreements vary by account. That is the system working as designed, and it is why a documented basket beats a hunch. The register to aim for is the one that contractor closed with: “We use several supply houses. I an friendly to all of them but not friends with any of them. All I want is good materials at a fair price.”

When switching is actually the right call

Price alone is rarely it, because price is what your incumbent can fix in an afternoon once you show them a real basket. The reasons that hold up are structural:

They cannot stock what you install. No discount fixes a two-day wait on your standard fitting.
Delivery and will-call do not fit your schedule. Route days and cutoff times are hard constraints on a service shop.
Quotes arrive too late to shop. Sometimes deliberate, sometimes genuinely not: as one contractor noted, “A lot of times, especially with lighting, the reason the supply house is giveing you the price last minute is because that is when they get it from their vendors.” The test is whether they will commit to a date, not whether they were late once.
Billing errors keep recurring after you flag them. Everyone makes errors. The signal is what happens the second time you raise the same one.
Your manufacturer lines moved. SPA support follows the line, not the building.

Four of those five are things you should raise before you shop. Most are fixable, and raising them is the conversation covered in how to negotiate with your supply house.

The checklist for moving an account without losing money

Before you move volume:

Export 12 months of invoice history from the old account, per SKU, per unit price
Basket-price 20 to 30 real SKUs at both houses on the same day, same UOM
Get credit line and payment terms from the new house in writing
Get the category discount structure in writing, not a headline percentage
Hand the new house your top-50 SKU list and ask which lines carry manufacturer support
Confirm delivery route days, will-call hours and order cutoff times
Name one inside rep and one backup, with direct contact details

Before you go quiet at the old house:

Return everything returnable, inside the published return window
Take delivery of or cancel every open special order
Convert every promised credit into a posted credit memo
Reconcile the closing statement line by line

In the first 90 days at the new house:

Re-point and spot-check the estimating price file against a live quote
Match every invoice against its PO and packing slip before it gets paid
Compare invoiced unit prices against the quoted basket monthly, not annually
Set a calendar reminder for a rate review at the six-month mark, before the introductory pricing has a chance to drift

The last one matters most. Introductory pricing is legitimate, and the risk is not that it exists but that nobody rechecks it six months later. A new supplier with no price baseline behind it is the exact condition in which drift goes unnoticed, which is probably the problem you left the old house to solve.