Scoping a Commercial Bid So You Don't Eat the Difference
Why this matters
The difference between a commercial job that makes your margin and one that eats it is rarely the work in the middle of your scope. It is the work at the edges, the piece nobody clearly assigned, the handoff between your trade and the next. Whoever fails to name the edge inherits it, and on a lump-sum bid that means it comes straight out of your profit. Scoping is not paperwork you do after estimating. It is the discipline that decides which gaps you priced, which you excluded, and which you are about to absorb for free.
You lose money at the edges, not the middle
Your quantities and labor rates cover the core of the work. The losses live where your scope meets someone else's, or meets nothing at all.
- The item shown on a drawing but assigned to no trade in the spec.
- The task everyone assumes is included because it obviously needs doing, which is exactly why no one priced it.
- The connection between your work and the next trade, where each of you scoped up to a line the other did not draw in the same place.
Scope by boundary, not just by contents. Define where your work stops as carefully as you define what it includes.
Define where your scope stops
Every scope has edges. Name each one before you bid.
- The verb on each line item sets the boundary. Furnish-and-install means you provide and install; install-only means the item arrives and you set it; furnish-only means you supply and someone else installs. Bidding install-only work as if the material were free is a classic underbid. (See related: Reading Bid Documents.)
- The trade handoffs are where scope falls through. Your equipment runs through another trade's wall, is powered by another's circuit, is framed by another's structure. Write down who does the cutting, the patching, the final connection, and the coordination.
- The vertical and horizontal limits. Where does your pipe, wire, or duct start and stop? "To within five feet of the equipment" and "to the equipment" are different jobs.
Keep a standing exclusions list
The fastest way to stop eating gaps is a boilerplate exclusions list your shop attaches to every bid. It forces the whole team to decide, every time, whether each recurring gap item is in or out.
| Commonly unstated gap | Default question to answer |
|---|---|
| Cutting, patching, and core drilling | Ours or another trade's? |
| Painting and final finishes | Included or by others? |
| Temporary power, light, and heat | Provided by whom? |
| Permits and engineering | In our scope or the GC's? |
| Off-hours or phased access | Priced at what premium? |
| Hazardous-material handling | Excluded unless specified? |
| Cleanup and debris removal | Ours daily, or GC's dumpster? |
You do not have to exclude all of them. You have to decide on each one and put the decision in writing, so a gap becomes a line you priced or a line you named as out, never a silent assumption.
Assume nothing about site conditions and access
A bid carries hidden assumptions about the site, and the ones you leave unstated are the ones that surprise you.
- State your assumed working hours. A job that turns out to require nights or weekends carries a labor premium you did not price.
- State assumed existing conditions. If you priced clean, straightforward access and the reality is a live occupied building with restricted paths, your production rate drops and your assumption protects you.
- State what you assumed is already in place. Existing power, existing structure, existing openings. If it is not there, that is a change, and a stated assumption is what makes it one.
Reconcile the takeoff to the scope you defined
Your quantity takeoff and your scope boundary have to agree. A takeoff that counts to a different edge than your scope statement is a gap in disguise.
- Confirm every counted quantity sits inside the boundary you defined, and every boundary item has a quantity behind it.
- Have a second person read the scope and exclusions before the bid goes out. The estimator who built it is the worst person to catch what it is missing.
- The review question is simple: reading only this scope and these exclusions, is there any way work lands on us that we did not price? If yes, close it now.
The rule to keep
What you do not name, you own. Price the middle honestly, define every edge, exclude in writing what is not yours, and reconcile the count to the boundary. A gap you scoped is a gap that cannot quietly become your loss.
References
- CSI MasterFormat and standard scope-of-work conventions
- Trade-standard practice for bid exclusions, allowances, and takeoff reconciliation
- See related: Reading Bid Documents; The Scope on a Bid Is Vague Decision Tree