The Operation and Maintenance Manual: What it is and Why it Matters

At the end of every construction project your contractor will hand over an Operation and Maintenance Manual (O&M). This is whether it’s new home construction, a tenant buildout or a commercial structure. Depending on the size of the project, this might be a single binder or a dozen of them. What’s inside represents a significant amount of money in warranty protection and maintenance guidance that most owners never utilize.

That’s not an exaggeration. The calls happen on virtually every project after closeout. Facility managers and property owners asking who installed what, where something was purchased, or how long the warranty ran. All information sitting clearly labeled in the O&M Manuals already in their possession. The volume of paperwork is intimidating, and most people don’t know what they’re looking at. This post is here to change that.

What Operations and Maintenance Manuals Contain

Operation and maintenance manuals — commonly called O&M manuals in construction — are the official record of your completed project. They’re assembled by your contractor at closeout and compiled from information submitted by every subcontractor and supplier on the project.

A complete set of O&M manuals should include:

• Contact information for the prime contractor and every subcontractor, including who to call for warranty work
• Product data sheets and manufacturer literature for installed materials and equipment
• Manufacturer warranty documentation for all major products and systems
• General contractor and subcontractor warranty certificates
• As-built drawings for mechanical, electrical, plumbing, and fire protection systems
• Certificate of occupancy (where applicable)
• Final inspection sign-offs and permit closeout documentation from the local governing authority
• Utility and easement information relevant to the property

The operation and maintenance manual is organized by trade and system category. You may find sitework, concrete, masonry, doors and windows, finishes, mechanical, electrical depending on scope. This is so information for any specific part of the project can be located without digging through unrelated material.

Why O&M Manuals Often Get Shelved and Never Opened

Assembling Operations and Maintenance manuals is one of the last administrative tasks on a project, and it’s rarely anyone’s favorite.

By the time closeout arrives, the experienced project team has largely moved on to the next job. The task of collecting submittals from subcontractors and assembling the binders often falls to junior staff or administrative personnel. Any they’re working from a checklist.

The result is that the O&M Manuals are sometimes incomplete, inconsistently organized, or turned over with little explanation of what’s inside. Let alone how to use them. When a binder pr a stack of binders lands on your desk at the end of a project it’s easy to box them up and move on. This is exactly what happens more often than it should.

The cost of that decision shows up later, when a warranty claim goes unfiled because no one knew it existed. Or when a repair gets done by the wrong contractor and voids the original installer’s warranty. Understanding what’s in the manuals — and how to use them — is worth the time it takes.

The Three Types of Warranties in Your O&M Manual

Most owners assume they have “a warranty” on their project. In reality, there are three distinct types of warranty coverages included in your O&M manuals. Each with different terms, durations, and claim processes.

General Contractor’s Warranty

Unless the contract specifies otherwise, the general contractor warrants that all work performed is in accordance with the contract documents. It’s free from defective materials, equipment, and workmanship. The industry standard duration is one calendar year from the date of substantial completion. Any defective or inferior work discovered within that period is the contractor’s responsibility to correct at no cost to you.

Subcontractor Warranties

Each trade contractor — whether hired by the general contractor or directly by you — carries the same obligation for their scope of work. This is typically for the same one-year period. Some project specifications require longer warranty terms from specific trades. Roofing contractors, for example, are commonly held to a two or three-year labor warranty. This is due to the nature of the work and the consequences of a failure.

Manufacturer Warranties

This is where significant long-term value often goes unclaimed. Manufacturer warranties on installed products frequently extend well beyond the one-year contractor warranty period. Some can extend by decades. A few examples:

• Quality wood doors may carry a limited lifetime warranty
• Commercial door hardware and closers can carry warranties of 10 years or more
• Roofing materials, depending on the product, range from 10-year to 50-year manufacturer warranties
• HVAC equipment compressors commonly carry 5-year to 10-year warranties

One important distinction with manufacturer warranties: they typically cover defective parts or components, not the labor to remove and reinstall them.

The manufacturer will provide a replacement part. The cost of removing the failed component, shipping it back, and installing the new one is generally your expense.

That’s still far less costly than replacing the item outright — which is what happens when owners don’t know the warranty exists.

How to Make a Warranty Claim

The process for making a warranty claim depends on where you are in the warranty timeline.

During the first year:

All service requests go to the general contractor using the contact information in Division 1 of your O&M manuals. The general contractor coordinates with the responsible subcontractor and schedules the repair. This is at no cost to you.

After the first year:

Contact the subcontractor directly for any work within their warranty period. If their warranty has also expired, you’re free to hire any qualified contractor for the repair. You are not obligated to return to the original installer once their warranty period has ended.

For manufacturer warranty claims:

Contact the manufacturer directly. Have your product documentation, model and serial numbers, and installation date ready. The manufacturer warranty documentation in your operation and maintenance manual will specify the claim process for each product.

3 Things That Can Void Your Warranty

Understanding what protects your warranties is just as important as knowing what they cover. These three issues void warranty coverage more often than any others — and all of them are avoidable.

1. Using a Different Contractor During the Warranty Period

If work within an active warranty period is performed by anyone other than the original installing contractor, that contractor’s warranty is voided.

The logic is straightforward: if someone else has modified the original installation, the original installer can no longer stand behind the work.

This applies to repairs, modifications, and even well-intentioned improvements. During an active warranty period, always go back to the original contractor first.

2. Failing to Complete Equipment Startup Documentation

Many mechanical and electrical equipment manufacturers require a completed startup checklist as a condition of warranty activation. This meaning the warranty doesn’t begin until the paperwork is submitted. It is more common than most owners realize, and missed more often than it should.

Carrier Corporation is a clear example. Every Carrier HVAC unit ships with a startup checklist. It must be completed by an authorized representative when the equipment is first commissioned. If that checklist isn’t filled out and submitted, the manufacturer’s warranty is never activated. This is regardless of whether the equipment was properly installed.

What typically happens: the mechanical contractor overlooks the checklist in the back of the equipment manual. It never gets submitted, and the warranty sits dormant.

The owner finds out three years into a five-year compressor warranty when something fails and the manufacturer has no record of activation.

The fix is simple: during your first year — while you still have the general contractor’s warranty as a backstop — go through your O&M manuals.

Confirm that startup documentation for all major mechanical and electrical equipment was completed and submitted. If it wasn’t, you have time to address it.

3. Not Following the Manufacturer’s Maintenance Requirements

Manufacturer warranties are conditioned on the product being maintained according to their specified guidelines. Changing HVAC filters at the recommended intervals, using pH-balanced cleaners on tile, avoiding solvents on natural stone.

Explicitly following manufacturer guidelines on cleaning methods — these aren’t suggestions. They’re warranty conditions.

When you file a manufacturer warranty claim, one of the first questions you’ll be asked is how the product was maintained. If the answer doesn’t align with their recommendations, the claim can be denied.

The maintenance requirements for every installed product are in your O&M manuals. Following them costs nothing and protects coverage that can be worth thousands of dollars.

Why Your Operation and Maintenance Manual is Valuable

The stack of binders your contractor hands you at closeout isn’t paperwork busywork.

It’s the documented record of your project — who built what, what products were installed, what warranties are in place. Plus how to maintain everything to protect those warranties over time.

You don’t need a construction background to use them. You need to know where they are, what’s in them, and what to do — and now you do. The first year after project completion is your “use it” window to catch anything that was missed.