Scope buyout: deciding in-house or sub, scope by scope

MEPSub · 7 min read · November 2026

A mechanical bid is rarely one price. It’s a stack of scopes — piping, ductwork, controls, insulation, test & balance — and for each one you either do it yourself or hire someone who does. Get those calls right and the bid is competitive; get them wrong and the margin disappears during buyout.

What “scope buyout” means

Before the bid, you decide for each scope: self-perform, sub it out (furnish and install), or split (you furnish, a sub installs — or the other way round). After you win, buyout is turning those decisions into signed subcontracts and purchase orders at, or under, the numbers you carried.

Questions to ask per scope

• Do we have the crew in those weeks? Look at what is already booked, not just headcount.
• Do we have the shop capacity? For sheet metal: pounds a week against what’s booked.
• Is it our trade? Insulation, TAB, controls and firestopping are often better with specialists.
• Where is the risk? A sub on a lump sum carries production risk; your own crew means you carry it.
• What does the GC require? Some projects limit how much can be subcontracted, or require certified subs.

Carrying sub numbers in the bid

For subbed scopes, get real quotes — ideally two or three — on the same scope package, without your own quantities or prices in it. Level them: same inclusions, same exclusions, same schedule. Then carry the number you trust with your markup for supervision, coordination and risk. A scope you couldn’t get a quote for is a plug; mark it as one so nobody forgets to replace it before the bid goes out.

After you win: buying it out

1. Freeze the budget from the bid, by scope.
2. Award subcontracts with a schedule of values that rolls up into your own SOV to the GC.
3. Place POs for your own material, fabrication and equipment against the same budget.
4. Compare bought vs budget per scope — and know before you sign whether you are over.
5. Carry changes both ways: when the GC issues a change, price your subs’ part; when a sub asks for one, check it against what the GC approved.

During the job

Track each sub like a crew: the look-ahead you sent them, the crew they promised, who actually showed up, their daily reports, their pay applications against approved progress, their lien waivers and insurance. Close them out with a checklist — O&Ms, warranties, as-builts — before final payment.

How MEPSub handles it

In MEPSub every scope on the estimate is marked in-house or sub, with the sub number carried at your markup and plugs flagged. After the win, Buyout compares budget vs bought per scope, subs get a private job page with their look-ahead and closeout list, their approved progress fills your AIA pay application to the GC by scope, and capacity shows your crew and shop load against the weeks the work lands. See Scope buyout.

The short version

Decide per scope, not per job. Level sub quotes before you carry them, mark plugs, freeze the budget when you win, and buy out against it — with changes carried both ways and subs tracked like your own crews.