Scoping a Multi-Trade Job

Why this matters

A job that crosses trades is where scopes collide and money disappears in the gaps. Your work depends on someone else finishing first, or theirs depends on you, and the seam between the two is whose problem nobody owned. The thing that fails on multi-trade work is rarely the work itself. It is the handoff, the sequence, and the assumption that the other guy had it covered. Scope the seams as carefully as you scope your own part.

What "multi-trade" really means for your estimate

A multi-trade job is any work where more than one craft has to touch the same job for it to be done: a remodel, a system replacement that needs a wall opened and closed, a new install that needs power, water, and finish work. You may be one trade of several, or you may be the one pulling it together.

The estimating problem is the same either way. Your scope has an edge where it meets the next trade, and that edge has to be drawn, sequenced, and owned. A clean estimate for your part is still a failed estimate if it does not say where your part stops and the next begins.

Draw the seams explicitly

For every place your work touches another trade, write down three things:

• Where your scope ends. "We set the unit and make our connections up to the point of tie-in. We do not provide the supply circuit." The customer and the other trade must know exactly where you stop.
• What you assume the other trade delivers. "Priced assuming power is run and terminated to our location before we arrive." If that is not there when you show up, the assumption is your reason to not sit idle on the clock.
• What you hand off in what condition. "We leave the wall opened for the other trade; closing it is excluded." Spell out the state you leave things in, or you will get blamed for the gap.

The seam is where every dispute lives. Name it on paper and most disputes never happen.

Sequence drives everything

Trades have to happen in an order, and the order is dictated by physical dependency, not by who is free that week:

• What has to be done before you can start? If the rough work, the opening, or the supply has to be in place first, your start date depends on theirs. Quote with that dependency stated, not hidden.
• What has to wait until you are finished? If the finish trade cannot close up until you pass inspection or finish your part, you are on their critical path. Say so, because if you run late, you hold up everyone behind you.
• Who closes it up? The single most-fumbled handoff. Opening a wall is one trade's job; closing it is often nobody's until the customer asks. Decide whose scope that is before anyone opens anything.

A sequence written into the estimates keeps the trades from tripping over each other and keeps you from sitting idle waiting on a no-show.

The gaps where money leaks

Watch the predictable holes:

• The "somebody will handle it" task. Patch, paint, haul-away, final connection, cleanup. The small task between two trades that neither priced. Either claim it and charge for it, or exclude it in writing.
• The double-disturbance. You open it, another trade works, then you come back to finish. That second trip is real time. Price the return, do not absorb it.
• The waiting cost. You arrive and the trade before you is not done. Quote with an assumption that the prior work is complete, so a no-show on their end is not free time on yours.
• The inspection dependency. If your work must be inspected before the next trade closes up, that timeline is part of the job. A failed or delayed inspection cascades down the whole sequence.

If you are coordinating, not just doing

When you are the one tying the trades together, you have an extra layer to scope:

• Decide who owns the schedule. Someone has to call the order and confirm each trade is ready before the next arrives. If that is you, it is real work and belongs in your scope.
• Confirm the handoffs in advance. A two-minute call to the next trade ("we'll have it opened by Tuesday, you good to close Wednesday?") prevents the idle day.
• Make every trade's edge match. Where your subs' scopes meet, the edges have to line up. A gap between two subs' scopes is a gap you eat as the coordinator.

What good multi-trade scoping looks like

Every trade's estimate says exactly where its work stops. The handoffs are named, with who-does-what at each seam. The sequence is written, with the dependencies stated. The in-between tasks (patch, paint, haul, close-up) are each assigned to someone in writing. And the assumptions protect you when another trade is late or short. That is a job that finishes clean instead of finishing in a finger-pointing meeting.

References

• Construction-standard practice for scope coordination and trade sequencing
• SBA and contracting guidance on subcontractor handoffs and written scope boundaries
• See related: Scope Creep Starts at the Estimate
• See related: The What-Could-Go-Wrong Pre-Job Scan