For Demolition / Abatement Contractors
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Demolition / Abatement Contractors

The Hazmat Survey
Says No ACM. The
Demo Crew Found 2,400 SF.

Phase I and Phase II surveys miss things. Asbestos in floor tile adhesive under a new floor finish. Lead paint on structural steel coated over 40 years ago. PCBs in old transformer housings. Hazardous material discoveries mid-demo are the most common source of budget overruns in renovation work — and they're almost never priced into the original bid. Vernier fixes that.

$15–60/SF
Undiscovered asbestos adds this much to demolition costs per SF of affected area
Mode C
Scope development with survey assumption is the #1 risk management document in demolition
#2
Demolition is the second most litigated construction scope after roofing
Hazmat Contingency
Belongs in the Bid,
Not in the Change Order
Submit a demolition bid where undiscovered conditions blew your budget. Randy reviews the documentation gap.
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What We See in Demolition Businesses

The Risks That
Define Demolition Work.

Demolition work has the highest ratio of unknown risk to visible scope of any commercial trade. The problems below explain why.

☠️
Hazardous materials surveys that don't find everything
Phase I environmental and bulk sampling surveys are designed to find what's accessible and representative — not everything. ACM in inaccessible locations, lead paint under multiple finish layers, PCBs in transformers on the demo list, or unknown chemical storage in floor drains discovered during demolition. A bid that doesn't have a documented survey-assumption contingency has accepted 100% of the undiscovered hazmat risk.
🏗️
Unknown structural conditions behind finishes
Selective demolition in an occupied building means working around finishes that conceal structural systems built to unknown standards, with unknown modifications, containing materials that weren't on any drawing. Wood framing with dry rot. Steel connections that have been field-modified. Unreinforced masonry behind drywall. Every finish removal is a potential structural surprise — price it or exclude it explicitly.
🚛
Disposal cost escalation from hazmat classification
General construction debris goes to a standard landfill. ACM-containing material goes to a licensed hazardous waste facility at 8–15x the disposal cost. A single unexpected asbestos-containing pipe insulation wrap on a mechanical system can turn a $4,000 disposal cost into a $40,000 disposal event. Define your disposal assumption explicitly.
⚠️
Selective demolition scope boundaries left ambiguous
Selective demolition in a tenant improvement — remove walls to structural deck, preserve adjacent tenant space, coordinate with building security system, protect occupied zones — is a completely different scope than what "demo" looks like on a line item. The scope boundary between what you're removing, what you're protecting, and what you're salvaging belongs in the bid document, not in a verbal pre-bid conversation.
Vernier for Demolition Contractors

Vernier Modes for
Demolition's Unknown Risk.

Demolition risk is priced or absorbed. These modes price it correctly before you commit.

C
Primary Mode · Scope Development
Survey-assumption scope letter with hazmat contingency pricing
Mode C generates a Scope Development Letter that documents your survey-assumption basis (what survey exists and what it covers), defines undiscovered hazmat as a change order event with a pre-agreed unit price, establishes the scope boundary between your work and the general contractor's, and prices the base scope and contingency band separately.
A
Primary Mode · Full Bid Package
Tiered proposals with hazmat contingency bands
Platinum/Gold/Silver proposals for demolition where each tier represents a different level of hazmat contingency the owner is accepting. Platinum includes a comprehensive survey-plus-contingency allowance. Silver is based on the existing survey with defined change order triggers. The owner chooses which risk level they want to carry.
B
Budget / ROM
Demo budgets with hazmat range pricing
Pre-survey demo budgets where the environmental work isn't done yet. Mode B returns a clean-condition estimate and a contaminated-condition estimate with the survey and assessment work that would narrow the range. Owners who understand both numbers make better decisions about whether to commission the survey before bidding.
D
Plan Review
Demolition scope coordination and selective demo review
Mode D reviews demolition drawings for structural elements that may be impacted by demo scope, coordination conflicts with utilities that must remain active, protection requirements for adjacent occupied spaces, and phasing conflicts with other trades working in the same areas.
Undiscovered ACM cost impact
$15–$60/SF
When asbestos-containing material is discovered during demolition that wasn't identified in the pre-bid survey, the cost impact runs $15–$60 per square foot of affected area — covering work stoppage, abatement contractor mobilization, air monitoring, disposal at a licensed facility, and re-inspection before demo can resume.

A Vernier Mode C scope letter defines your survey basis, establishes undiscovered ACM as a documented change order event with a pre-agreed unit price, and protects your business from absorbing a cost that legitimately belongs to the owner.
From the Knowledge Base · Bidding
"Walk on bids where the documents aren't complete enough to price accurately. Bidding from incomplete information means you're pricing your own assumptions, not the owner's scope."
Randy Hanson · From: "When to Walk Away From a Bid"
Read the article →
Benchmarks · Demolition

Demolition Contractor Benchmarks.

Demo budget overrun from undisclosed conditions
22–45%
Average cost overrun when hazmat survey isn't comprehensive
With survey-assumption documentation
6–14%
When change order triggers are pre-agreed and documented
Disposal cost assumption in bid
<40%
Many demo bids don't differentiate standard vs. hazmat disposal
With Vernier scope documentation
100%
Every Vernier demo bid documents disposal cost assumption and classification basis

The Undiscovered ACM Is Not Bad Luck. It's an Unpriced Contingency.

What's behind the wall, what the survey missed, what gets reclassified at the landfill — all of these have a known cost range. Vernier documents the assumption and the contingency before you commit to a fixed price.

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