Commercial Pre-Sale and Pre-Lease Sewer Scoping

Commercial due diligence checklists cover roofs, HVAC systems, parking lot condition, and structural elements as a matter of routine. The sewer lateral connecting the building to the municipal line is just as capable of producing a six-figure repair bill, yet it's often left off the list entirely — mainly because it's underground, out of sight, and easy to assume is "someone else's problem" until it isn't. A real estate sewer inspection combined with commercial sewer camera inspection closes that gap before money changes hands.

We handle this kind of pre-sale and pre-lease scoping regularly for commercial properties in Troy and Novi, where a mix of older strip retail and larger office and industrial buildings creates a wide range of sewer conditions depending on when the property was built and what's occupied it since.

Why Pre-Sale Scoping Is Different From Residential

A commercial building's sewer system is often more complex than a single-family lateral — larger diameter lines, multiple connection points for different tenant spaces, and in many cases a history of use by tenants whose disposal habits (restaurant grease, industrial byproducts, high-volume commercial laundry) put more strain on the system than typical residential use. That history doesn't show up in a walkthrough or a standard building inspection. It only shows up on camera.

Buyers who skip this step are effectively taking the seller's word that the sewer system is in acceptable condition, on a system that's expensive enough to repair or replace that the assumption carries real financial risk. A camera scope during due diligence turns that assumption into documented fact before the purchase agreement is finalized.

What Buyers Should Require

• A full camera scope of the primary lateral, not just a spot check near the building
• Inspection of any secondary lines serving individual tenant spaces, especially former or current restaurant units
• A written report identifying pipe material, condition, and any defects with footage locations
• Video footage they can share with their own contractor for a repair estimate if issues are found
• Scoping completed close enough to closing that the condition reflects current reality, not a report from years earlier

Any of these that a seller resists providing, or tries to substitute with an old inspection report, is worth treating as a flag rather than a formality. A seller confident in the property's condition has little reason to avoid a fresh scope.

What Tenants Should Require Before Signing a Lease

Commercial tenants, especially those in food service or any use with heavy plumbing demand, have their own reason to request a sewer scope before signing a lease: many commercial leases place maintenance responsibility for lines serving the tenant's specific space on the tenant, not the landlord. Signing a lease without knowing the baseline condition of that line means potentially inheriting a problem that predates your occupancy but becomes your financial responsibility to fix.

Due Diligence Timing

Scoping works best when it happens early enough in the due diligence period to actually inform negotiations, but close enough to closing or lease signing that the results are still current. For a sale, that typically means scheduling the inspection as soon as the purchase agreement's inspection contingency period opens, giving enough time to negotiate repairs or price adjustments if the footage turns up a problem. For a lease, it means requesting access before signing, not after — once a lease is signed, negotiating leverage over a pre-existing sewer issue mostly disappears.

What Happens When the Scope Finds a Problem

Finding a defect during pre-sale or pre-lease scoping isn't necessarily a deal-breaker — it's information that shifts the negotiation. Buyers can request a price reduction, a seller-funded repair before closing, or an escrow holdback tied to the repair cost. Tenants can request the landlord complete repairs before occupancy or negotiate an amended maintenance clause that excludes pre-existing conditions documented in the scope. None of that negotiation is possible without the video evidence in hand first. If a repair does get negotiated, a sewer line locating pass confirms exactly where the defect sits before a contractor prices the dig, which keeps a negotiated repair cost from ballooning once excavation starts.

What a Due-Diligence Report Should Actually Include

Not every camera scope produces a report that holds up in a negotiation. A verbal "it looked fine" or a phone video with no distance markers doesn't give either side anything to act on. What we provide for due-diligence work is a written report tying each finding to a distance from the access point, a severity grading (minor, moderate, or repair-needed), and still frames pulled directly from the footage at each defect location, alongside the full video. That level of detail is what lets a buyer's attorney or a tenant's broker actually use the report in a negotiation instead of just filing it away.

One honest limitation worth knowing before you order a scope: the inspection can only cover what's reachable from an existing cleanout or access point. Older commercial buildings sometimes don't have one in a useful location, or have one that's been paved over or built around during a past renovation. When that happens, the options are a temporary access point cut into the line or scoping from the nearest municipal connection instead, and either one is worth raising during scheduling rather than discovering on inspection day when the clock on a due-diligence period is already running.

Sale Scoping vs. Lease Scoping: Key Differences

Common Mistakes Buyers and Tenants Make During Due Diligence

The most common mistake is accepting a seller-provided inspection report instead of ordering an independent one. A report commissioned by the seller was scoped on the seller's schedule, by an inspector the seller chose, and there's no way to verify it reflects current conditions rather than a moment when the line happened to be running clean. An independent scope, timed close to closing, is the only version of this that actually protects a buyer's interests.

A second mistake is scoping only the primary lateral and skipping secondary lines serving individual tenant spaces, particularly former or current restaurant units. A building can have a perfectly sound main lateral while a grease-choked secondary line serving one unit is a near-term repair the buyer has no idea about until a new tenant moves in and immediately calls with a backup.

A third mistake, more common on the tenant side, is waiting until after signing to request a scope. Once a lease is executed, a landlord has little incentive to fund repairs for a condition that predates the tenant's occupancy but wasn't documented before the tenant took possession. Requesting access and scheduling a scope during lease negotiation, not after, is the only point where a tenant has real leverage to get a problem addressed before it becomes their bill to pay.

Worked Example: A Strip Retail Center Under Contract in Farmington Hills

Say you're under contract to buy a 1980s strip retail center in Farmington Hills with five tenant spaces, one of which is a restaurant that's occupied the same unit for over a decade. The purchase agreement gives you a 30-day inspection contingency. A full building scope early in that window shows the main lateral in reasonable condition, but the secondary line serving the restaurant space shows significant grease buildup and a section that's already narrowed by more than half. That finding, documented with footage and distance markers, becomes a specific negotiating point — a price adjustment or a seller-funded cleaning and repair before closing — rather than a surprise six months into ownership when the restaurant's drains back up during a dinner rush.

What Commercial Due Diligence Scoping Typically Costs

Commercial scoping costs more than a single-family residential inspection because of longer runs, larger-diameter pipe, and multiple tenant connection points — pricing across the wider Detroit area has ranged from roughly $254 to $1,722 depending on building size and complexity, with an average closer to $955 for a more involved commercial job. Weighed against a purchase price in the hundreds of thousands or millions, or a multi-year lease commitment, that cost is a rounding error compared to the six-figure repair risk a bad lateral can represent — which is exactly why it belongs on the same due diligence checklist as a roof or HVAC inspection rather than being treated as optional.

Step-by-Step: Scheduling a Scope Without Blowing Your Timeline

A due-diligence period has a fixed clock, and a sewer scope needs to fit inside it without becoming the reason a deadline gets missed.

1. Confirm the inspection contingency window's exact length as soon as the purchase agreement or lease term sheet is signed, not after
2. Request access to the building the same week — landlord or seller cooperation on access is often the actual bottleneck, not scheduling availability
3. Identify the access point (or points, for a multi-tenant building) before the crew arrives, so the visit isn't spent locating a cleanout
4. Scope the primary lateral first, then any secondary lines serving individual tenant spaces, prioritizing current or former food-service units
5. Get the written report with distance markers and severity grading within a few days, not weeks, so there's time left in the contingency period to negotiate
6. If a defect is found, get a repair or cleaning estimate from a contractor before the contingency period closes, so the number is in hand for negotiation rather than a rough guess

Second Worked Example: An Industrial Building Lease in Auburn Hills

A manufacturing tenant negotiating a lease on an older industrial building in Auburn Hills requested a sewer scope after noticing the lease's maintenance clause placed all lateral repair responsibility on the tenant, with no mention of pre-existing conditions. The building had last changed tenants over 15 years earlier, with no inspection record in between.

The scope found a section of cast iron pipe with significant internal corrosion — bad enough that a follow-up collapsed and broken pipe inspection was recommended to document the full extent before lease terms were finalized. Because this was documented before the lease was signed, the incoming tenant was able to negotiate a specific exclusion for that pre-existing corrosion in the maintenance clause, rather than inheriting responsibility for a problem that predated their occupancy by well over a decade. Without the scope, that corrosion would have simply become the new tenant's repair bill the day it finally failed.

What to Ask the Seller's Broker Before You Waive the Sewer Contingency

Due Diligence Myths vs. Facts

• Myth: A bank's appraisal or a standard building inspection covers the sewer lateral. Fact: neither typically includes a camera scope of the underground line — it has to be ordered separately.
• Myth: Title insurance protects a buyer from a bad sewer line discovered after closing. Fact: title insurance covers ownership and lien issues, not the physical condition of underground utilities.
• Myth: If the building passed its last municipal inspection, the private lateral is fine. Fact: municipal inspections typically cover the public main, not the private lateral connecting the building to it.
• Myth: A newer building doesn't need pre-sale scoping. Fact: construction defects like improper slope or a poorly bedded pipe can show up even in buildings built within the last couple of decades.
• Myth: Waiving the sewer contingency to make an offer more competitive is low-risk if the building looks well maintained. Fact: lateral condition has no visible correlation with a building's surface-level upkeep — the only way to know is to look.

Closing in Winter: When a Negotiated Repair Has to Wait

Timing a commercial closing during a Michigan winter adds a wrinkle that doesn't come up in a summer deal: if a scope finds a defect and the parties negotiate a seller-funded repair before closing, frozen ground can make that repair impractical to complete on the original timeline. Excavation through several feet of frost, common on deals closing in communities like Pontiac between December and March, often pushes contractors to recommend an escrow holdback instead of a pre-closing repair, with the actual dig scheduled for the spring thaw. Buyers and sellers negotiating a winter closing should raise this possibility before assuming a documented defect will simply be fixed by the closing date.

Next Steps: From Scope to Negotiated Outcome

A finished scope is only useful once it turns into a negotiating position or a repair plan. Our guide on who pays for sewer line repair covers how repair costs typically get allocated once a defect moves from a scope finding to an actual project, which is useful context whether you're the one paying or negotiating a credit. And if the scope itself is the line item you're trying to budget for, our breakdown of sewer camera inspection cost in Metro Detroit covers what typically drives commercial pricing up or down.

For landlords managing this process from the other side of the table, our related guide on why landlords and property managers need sewer camera inspections covers how to keep a portfolio's lines documented before a sale or lease dispute ever comes up.

Buying, selling, or leasing commercial property in Troy, Novi, or anywhere in Metro Detroit? Call Sewer Inspects at (614) 830-0578 for a free quote before you finalize the deal.