I track every vendor invoice across our multifamily portfolio. Last year, vendor spend accounted for roughly 38% of total operating expenses. Plumbing. HVAC. Electrical. Snow removal. Landscaping. Turnover crews. Appliance repair. Pest control. That's tens of thousands of dollars flowing out the door every month to people who aren't on your payroll.

Most owners pay whatever the invoice says and move on. That's a mistake. Not because vendors are overcharging, though some are. Because the relationship between you and your vendors is one of the most direct levers you have on your NOI. And most investors never touch it.

The Vendor Problem Nobody Talks About

Here's the pattern I see over and over. An owner buys a property. They need a plumber. They Google "plumber Omaha," call the first result, and pay $250 for a service call. The plumber does fine work. The owner saves their number. That plumber becomes "their plumber" for the next five years.

No negotiation. No comparison. No volume agreement. No priority scheduling. Just a name in a phone and whatever the invoice says.

Now multiply that across every vendor category. You're paying retail rates for every service on every property. On a 20-unit portfolio, the difference between retail vendor rates and negotiated rates across all categories can easily exceed $15,000-$25,000 per year.

At a 7 cap, that's $214,000-$357,000 in property value sitting in your vendor contracts. Waiting to be captured.

The Five Vendor Relationships That Matter Most

Not all vendor categories are created equal. Here are the five that move the needle the most on your P&L, ranked by impact.

1. Plumbing

Plumbing is the most expensive recurring vendor expense in multifamily. It's also the most urgent. A burst pipe or a backed-up sewer line doesn't wait for business hours or competitive bids.

The key metrics:

Service call rate. Market range in Omaha is $125-$250 for a standard service call. If you're paying $250 every time, you're overpaying.

After-hours premium. Some plumbers charge 1.5x for evening and weekend calls. Some charge 2x. Negotiate this upfront, because after-hours calls happen constantly in multifamily.

Response time. Price matters, but so does speed. A plumber who charges $150 but takes 48 hours to respond costs you more than a plumber who charges $200 and shows up in 4 hours. Water damage from a slow response can run into the thousands.

What we do: We have two plumbing vendors on retainer. One is our primary, handling all routine and emergency calls. They give us priority scheduling and a negotiated rate of $150/call with $125/hour labor after the first hour. Our secondary is the backup, available when the primary is maxed out.

Volume matters here. When you can tell a plumber "we manage a growing portfolio and you'll be our primary vendor," you get a different rate than when you call as a single-property owner. If you only own 5 units, consider joining forces with other local investors to pool volume. A local investor group with 50 combined units has real negotiating power.

2. HVAC

HVAC is seasonal, which means it's predictable. And predictable expenses can be planned, negotiated, and optimized.

The two biggest HVAC costs:

Seasonal tune-ups. A furnace tune-up runs $100-$150 per unit. An AC tune-up is similar. On a 20-unit building, that's $4,000-$6,000/year in preventive maintenance alone. Negotiate a per-unit bulk rate. We pay $85/unit for seasonal HVAC maintenance because we commit to the full portfolio every spring and fall.

Replacements. A furnace replacement runs $3,500-$5,500 installed. An AC condenser is $3,000-$5,000. These are capital expenses, not operating expenses, but the vendor relationship still matters. If you're replacing 3-5 units per year across your portfolio, negotiate an installed price. Our HVAC vendor gives us 15% below their standard residential rate because they know we bring consistent volume.

Preventive maintenance is the play here. A $85 tune-up that catches a failing inducer motor before it dies in January saves you a $2,500 emergency replacement plus the $500 after-hours labor premium. We run a twice-annual HVAC maintenance cycle across every unit in the portfolio. The total cost is meaningful. The savings from avoided emergencies are greater.

3. Turnover Crews

Every time a tenant moves out, the unit needs to be turned. Paint, clean, minor repairs, sometimes flooring and fixtures. The speed and cost of the turnover directly impact your vacancy loss and your operating expense.

Here's the math. A turnover that takes 14 days costs you roughly half a month's rent in vacancy. A turnover that takes 5 days costs you a sixth of a month's rent. On a $1,100/unit, that's the difference between $550 lost and $183 lost. Multiply by your number of annual turnovers.

What matters with turnover crews:

Speed. Your crew should be able to turn a standard unit (paint, clean, minor touch-ups) in 3-5 business days. If they take 10-14 days, they're either understaffed or not prioritizing your work.

Quality consistency. Every unit should come out looking the same. Same paint color, same cleaning standard, same fixture condition. Inconsistency in turns leads to inconsistency in leasing.

Pricing. A standard unit turn (paint, deep clean, minor repairs) should run $1,200-$2,500 depending on unit size and condition. If you're paying $3,500+ for a standard turn, either the scope is too large or the crew is too expensive.

We use two turnover crews that we've trained to our standards. They know our paint colors, our cleaning checklist, and our inspection criteria. Bringing on new crews means a learning curve, and learning curves cost time and money on every unit they touch.

4. Snow Removal

This one is specific to the Midwest, and it can destroy your winter NOI if you're not careful.

Snow removal for multifamily parking lots and sidewalks runs $150-$400 per event depending on property size and accumulation. In an average Omaha winter, you might see 15-25 snow events. That puts annual snow removal spend at $2,250-$10,000 per property.

The contract matters more than the price. There are two common structures:

Per-push pricing. You pay per snow event. Cheaper in light winters. Expensive in heavy winters. Unpredictable for budgeting.

Seasonal contract. You pay a fixed amount for the entire winter season, typically $3,000-$6,000 for a standard multifamily lot. Predictable. Easier to budget. The vendor absorbs the risk of a heavy winter.

We use seasonal contracts on every property. I would rather know my exact cost in October than get surprised by a 30-push winter that blows my budget. The vendor builds in their margin, but predictability is worth paying for.

The real cost of bad snow removal isn't the invoice. It's the slip-and-fall lawsuit from a tenant who fell on an icy sidewalk that should have been cleared at 6 AM. That lawsuit settles for more than your annual snow removal budget. Make sure your vendor has proper insurance, and make sure the contract specifies response time, not just "we'll get to it."

5. Landscaping

Landscaping is the vendor category most owners overpay for because they never bid it out. They hired the first lawn guy they found, and they have been paying the same rate (or an increasing rate) for years without comparing.

Standard landscaping for a 10-20 unit multifamily property should run $250-$500/month during the growing season for weekly mowing, edging, trimming, and basic bed maintenance. If you're paying more than that and your property doesn't have extensive grounds, you need to get competitive bids.

Three bids, every two years. That's our rule. We rebid landscaping contracts every two years. Not because the current vendor is bad, but because pricing drifts upward when there's no competitive pressure. Getting three bids keeps everyone honest and ensures we're paying market rate.

The Negotiation Playbook

You don't need to be aggressive. You need to be organized. Here's the approach that works.

Lead with volume and consistency. Vendors want predictable work. If you can offer them consistent, recurring business across multiple properties, that's worth a discount. Don't ask for a lower rate. Ask what rate they would give you for a 12-month exclusive commitment across your portfolio.

Pay on time, every time. The fastest way to get priority service and favorable rates is to be the client who always pays their invoice within terms. In the vendor world, a client who pays on time is worth more than a client with a bigger portfolio who pays 60 days late. We pay every vendor within 15 days. That reputation is worth more than any negotiation tactic.

Annual reviews. Once a year, sit down with each major vendor and review the relationship. What's working? What's not? How has their pricing changed? Are their response times still meeting your expectations? This isn't confrontational. It's business. Vendors respect owners who manage the relationship professionally instead of only calling when there's a problem.

Have a backup. For every critical vendor category, maintain a relationship with a secondary vendor. Not because you expect your primary to fail, but because the existence of an alternative keeps the relationship healthy. A vendor who knows they're your only option behaves differently than a vendor who knows you have an alternative.

The NOI Impact

Let me put specific numbers on this. Across a 20-unit portfolio in Omaha, here's what optimized vendor relationships can save compared to retail, unmanaged vendor spend.

Plumbing: $2,000-$4,000/year in reduced service call rates and avoided emergency premiums

HVAC: $1,500-$3,000/year in bulk maintenance pricing and avoided emergency replacements

Turnover crews: $3,000-$6,000/year in faster turns (reduced vacancy) and negotiated pricing

Snow removal: $1,000-$2,500/year with seasonal contracts vs. per-push pricing in a heavy winter

Landscaping: $1,000-$2,000/year from competitive rebidding

Total: $8,500-$17,500 per year on a 20-unit portfolio.

At a 7 cap, that translates to $121,000-$250,000 in property value. From vendor management alone.

This isn't glamorous work. Nobody posts about negotiating plumbing rates on social media. But it's the work that separates operators who build real equity from operators who just own buildings. Your vendors are partners, not line items. Manage the relationships like they matter, because they do.

If you own rental properties and you're not sure they're hitting their ceiling, let's talk. Reach out at Tanner@TopTierInvestmentFirm.com.

Tanner Sherman is the Principal and Managing Broker of Top Tier Investment Firm in Omaha, Nebraska. He co-hosts the Freedom Fighter Podcast with Ryan of Avara Investments.

The Vendor Relationships That Make or Break Your NOI