Why parts are where maintenance overpayment concentrates
Three forces push parts spending above market. Urgency: when an air conditioner fails in July, the property pays whatever the part costs that afternoon, because a resident is waiting. Opacity: parts are identified by manufacturer numbers — a blower motor appears on an invoice as an alphanumeric string no one in the office can price-check. Convenience: technicians buy from the supply house they already know, and that one counter quietly becomes the sole source for everything. None of these is misconduct. All three raise cost. The National Apartment Association's Income/Expense IQ survey put multifamily repairs and maintenance at $1,098 per unit for 2024, and parts flow through that line all year in small, unexamined purchases. That is exactly the transaction profile — high count, low value per line — where overpayment hides. See what maintenance should cost per unit for the broader benchmark.
HVAC parts: OEM versus universal, and where each channel fits
HVAC parts split into two classes. OEM parts carry the equipment manufacturer's number and are the safe default for control boards, matched compressors, and anything on equipment still under warranty. Universal parts — run capacitors, contactors, condenser fan motors, igniters — are built to a spec, not a brand, and a universal that meets the rating replaces the OEM at a lower price with no functional loss. The channels differ too. Local supply houses offer counter service and same-day availability, but they price to the account, and small accounts pay more than large ones. Online HVAC part specialists publish their prices, which makes them useful as a benchmark even when the purchase stays local. The rule: the same part number can carry different prices in different channels on the same day, so no channel should be a default. How to run a supplier price comparison covers the mechanics.
Appliance parts: the OEM part number is the search key
Every appliance part resolves to an OEM part number, and that number is the search key. Start from the appliance's model tag, pull the manufacturer's parts diagram, and read the exact number — including revisions, since manufacturers supersede numbers as designs change. Then search the number itself, not a description. Searching the OEM number across suppliers surfaces two things: the OEM part at a range of prices, and cross-reference compatibles — parts made to fit that number, usually at a meaningful discount. For high-volume commodity parts — dryer heating elements, washer and dishwasher fill valves, oven igniters, thermostats, belts — verified cross-references are a legitimate buy. Be stricter with electronic control boards, where unbranded substitutes fail early. The distinction to hold: a cross-reference that names the OEM numbers it replaces is a checkable claim; a part that says it fits most models is not.
Capture the part number at the work order, not the invoice
The part number exists at exactly one convenient moment: when the technician is standing in front of the failed part. Capture it there. Require a photo of the part label or the equipment model tag on the work order, and make the part-number field mandatory before a purchase order is issued. This costs the technician thirty seconds. It buys the office two abilities it otherwise never has: purchasing can price-check the number across channels before a non-urgent order goes out, and anyone can verify the invoice against a known part afterward. Without capture, the invoice line reads motor or board with a price attached and no way to test it — which is why part lines pass invoice review untouched at most properties. A part number turns an unreviewable line into a checkable one.
Stock the parts that fail constantly; order the rest on demand
A small stockroom beats a fast supplier. Pull twelve months of work orders and list the parts that appear again and again — at most properties that means run capacitors in the common ratings, contactors, universal igniters, toilet fill valves and flappers, dryer heating elements, and appliance belts. Buy those in multiples from the cheapest verified channel and put them on a shelf. Now the July capacitor failure is fixed from stock at a planned price instead of from a counter at an urgent one. Everything else stays order-on-demand with a price check before the PO. Two rules keep the program honest: stock only what your own history shows failing, and restock from the price-checked channel, not from whichever counter was fastest that day. Unit turns concentrate parts demand, so build stock before heavy turn months — Zego's survey of property managers put average turnover cost near $3,872 per move-out.
When paying a premium is the right call
Sometimes the expensive part is the correct purchase. A down air conditioner in July or a dead water heater in January is a habitability problem, and the cost of a slow repair — resident goodwill, hotel nights, in some states statutory remedies — exceeds any parts markup. In those cases the premium buys time, and time is genuinely worth the money. The discipline is keeping the emergency price for emergencies. Ask one question at the point of order: is a resident living without heat, cooling, or hot water right now? If yes, buy from the fastest reliable source and do not apologize for the price. If no, the order can wait a day for a price check — and most orders can. The failure mode is not the July premium. It is the July premium becoming the standing price in October, for every part, from one supplier, unexamined.
Your invoice file shows whether the parts program works
Procedures drift. The way to know whether part numbers are being captured and price-checked is to price the invoices after the fact: take a quarter of repairs-and-maintenance invoices, pull every part line, and check each part number against what verified suppliers charge for it. Lines you cannot price are capture failures. Lines priced well above an available channel are sourcing failures, and they cluster — usually around one supply house or one trade. This is the work The Benchmark does at SKU level every quarter; the average annual savings it discovers for a 200-unit property is $22,546, and parts are consistently where the money concentrates. For the forward-looking half of the problem, Benchmark Search — coming soon — is purpose-built for exactly this: proactive best-price search for multifamily purchasing, strongest on niche items like HVAC components and appliance parts.
