Buffers, Before-Phase Planning, and the In-N-Out Analogy

Buffers Protect the Person Doing the Work, Not Just the Work That Comes Next

Here’s the deal. A recent trip through a chaotic drive-thru line taught me something about buffers I had never quite articulated before, and it connects directly to a second, related habit worth building into every project long before a phase ever actually starts.

Short answer: Buffers protect the person doing the work, not just the next trade. If you can’t build in much buffer, plan deeper before the phase starts: advanced sequencing, a first-run study or mock-up, and a visit to the trade, in the four to six months before work begins. Ideally, do both.

What a Crowded Drive-Thru Taught Me About Buffers

The In-N-Out near our house gets so busy that the line has to be barricaded and routed almost into actual traffic. Coming around the tight corner in my crew cab truck, I have to do a small three-point turn just to line up correctly. I try to pull forward and quickly reverse before the person behind me closes that gap, and almost without fail, someone pulls right up on my bumper anyway, leaving me no room to back up at all. Then it becomes a whole tense moment, because that person does not understand that my truck simply does not fit without a little room to maneuver.

This is not In-N-Out’s fault. It is a broader cultural habit of tailgating, crowding right up behind whoever is directly in front of us, assuming a couple of feet will not make a difference. It absolutely does.

That same habit shows up constantly on a real jobsite, crews stacked right up against each other with no room to adjust, assuming tight sequencing automatically means efficient sequencing. The two are not actually the same thing.

Here is the real insight underneath all of this. Buffers do not only protect the work that comes next in a sequence. They protect the actual person currently trying to finish their own task. If there is no room for someone to make an honest adjustment or correct a small mistake, that effectively means nobody on the project is allowed to make any mistake at all. Nobody is perfect. Expecting flawless execution from every single person, every single time, by removing all breathing room, is disrespectful to the actual human beings doing the work.

We will know construction is ready to flow the moment we, on our own freeways, finally stop tailgating each other. It really is a mindset issue as much as it is a technical one.

Watch for these signs a lack of buffer is quietly disrespecting the people actually doing the work, not just risking the schedule.

• Workers who feel they cannot pause to correct a small mistake without immediately falling behind an unforgiving sequence.
• A crew pressured to move forward the instant the person ahead of them clears out, with zero room to adjust or recover.
• A general sense among the team that any hesitation or human error will immediately cascade into a visible, blamed delay.

Why Limited Buffers Mean You Need Much Deeper Planning

If you cannot build in much buffer, the real alternative is increasing your level of planning well before the work ever begins. I call this before-phase planning, specifically avoiding the word pre so it does not get confused with pre-construction meetings. The four to six months before a phase like structure, foundations, interiors, or exterior work actually begins matters more than the moment that phase officially starts.

Before-phase planning includes your full plan, your pre-con meetings, and your look-ahead planning as the baseline. Beyond that, there is an enormous list of additional steps worth considering.

• Engaging four-dimensional sequencing, advanced drawings, and detailed models to work through the sequence before it ever reaches the field.
• Running first-run studies and physical mock-ups, and visiting other trade crews or project sites to see real examples firsthand.
• Holding fresh-eyes meetings and pre-mortems, imagining the phase has already failed and working backward to understand exactly why.
• Breaking construction work packages all the way down into installation work packages, running an advanced density analysis across your zones, and placing buffers strategically wherever they belong.

The list keeps going from there. Building physical models using foam, kinetic sand, or detailed three-dimensional mock-ups. Switching to a multi-train design where it makes sense. Building out detailed planning sheets and running a thorough pull plan. Onboarding, orienting, and even training a trade partner in a real dojo setting before they ever show up to the actual site. Identifying any non-participating trades early and correcting that situation directly. Verifying production rates and securing real labor commitments. Finalizing commissioning plans, pre-test safety planning, and advanced kitting for logistics completely in advance.

I have written a more complete version of this list in Before Phase Planning: The Work That Makes Every Construction Phase Succeed, since it goes on far longer than I can cover here.

The Three Things I Would Prioritize Above Everything Else

If I had to choose just a few of these to prioritize absolutely, I would pick advanced sequencing, a first-run study or mock-up, and actually visiting the trade directly to confirm they are completely ready to go. All of that sits alongside the pull plan, pre-con meetings, look-ahead planning, and supply chain management that should already be happening well before work begins.

Why Experts Live in the Before-Phase Planning

For project superintendents and project managers specifically, most of your real, valuable work should be happening during this before-phase planning window. Once a phase is ready and underway, hand that execution off to assistant superintendents and assistant project managers at the appropriate point, rather than staying behind to micromanage the actual work. Move on instead to the next phase’s before-phase planning effort. That is where the most senior, most experienced people should be spending their actual time.

Why Buffers and Planning Are Two Sides of the Same Coin

If you are not doing this level of deep, deliberate planning before a phase begins, you need real buffers to absorb the gaps that planning would have otherwise closed. And if you do not have real buffers, you need to be doing this level of planning instead. Honestly, you should probably be doing both regardless, since neither one fully substitutes for the other.

Building Both Habits Into Your Own Project

None of this requires choosing between buffers and deep planning as competing strategies. It requires recognizing that both protect your project, and your people, from the exact same underlying risk, the inevitable reality that something will not go exactly as planned.

If your project needs superintendent coaching, project support, or leadership development, Elevate Construction can help your teams build buffers into your schedule and depth into your before-phase planning, protecting both the sequence of work and the actual people responsible for carrying it out.

Want your team trained on this? See our Last Planner® System and Takt training.

So here is the challenge. Pick your next upcoming phase and ask honestly how much of your senior leadership’s time has gone into before-phase planning for it so far. If the honest answer is not much, that gap is exactly where your next stops and restarts are most likely to come from.

Bottom line: We will know in construction that we’re ready to flow once we, on our freeways, stop tailgating people. Give your people real room to be human, and plan deeply enough ahead of time that they rarely need much room at all.

On we go.

FAQ

Why do buffers protect the person doing the work, not just the work that comes afterward?

Because a schedule with no buffer effectively demands flawless execution from every single person, every single time, leaving no room for an honest mistake or a small necessary adjustment. That standard is unrealistic for actual human beings, which is why removing all buffer is described as disrespectful to the workforce, not simply risky for the project timeline.

What is the actual difference between before-phase planning and standard pre-construction planning?

Before-phase planning specifically refers to the four-to-six-month window leading up to a particular phase, like structure or interior finishes, rather than the broader pre-construction period covering the entire project. It involves a much deeper, more specific set of activities (advanced sequencing, mock-ups, trade visits) aimed at making sure that one particular phase is ready to start and finish smoothly.

Why should senior superintendents and project managers hand off execution to assistants once a phase begins?

Because the most valuable use of a senior leader’s time is deep planning for the next upcoming phase, not managing the day-to-day execution of work that has already been thoroughly prepared. Staying behind to micromanage ongoing execution pulls that senior attention away from the next phase’s before-phase planning, which is where their experience actually adds the most value.

Why are buffers and before-phase planning two sides of the same coin?

Because both ultimately exist to absorb the same underlying risk, the inevitable gap between a plan and real-world execution. Deep planning closes many of those gaps before they ever happen, while buffers absorb whatever gaps remain despite that planning, which is why I suggest doing both rather than relying on just one at the expense of the other.