Mechanical contractors doing sheet metal, piping, and controls work on the same job need phase-level job costing that separates each division's labor, material, and subcontractor costs. When these are blended into a single job total, the division losing margin is invisible until closeout. SPM builds mechanical job costing by division and phase so variance is visible at the division level during the job.

Mechanical Financial Systems

Sheet Metal, Piping, and Controls Each Needs Its Own Job Cost.

Mechanical HVAC jobs often have three distinct divisions doing the work: sheet metal fabrication and installation, piping, and controls. Each has a different labor productivity profile, different material cost structure, and different change order risk. Blending them into a single job cost total makes it impossible to know which division is losing money -- and which estimating assumptions are wrong for the next bid.

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The Problem

Where the Money Goes.

These are the three most common financial pain points -- and the ones that do the most damage when unaddressed.

Three Divisions, One Job Total

Sheet metal, piping, and controls tracked as a single blended job cost. Controls labor runs over by 40%. Sheet metal is under budget. Piping is on track. Total job cost looks fine -- until closeout when the controls overrun surfaces and the margin is gone.

Fabrication Shop Cost Not Allocated to Jobs

Sheet metal fabrication labor and shop overhead running to general overhead instead of being allocated to the jobs the shop produced for. Ductwork fabricated for Job A sits in overhead while Job A's job cost shows only field installation labor. Both numbers are wrong.

Controls Subcontractor Invoices Exceed Scope

Controls subcontractors -- BAS, DDC, VAV programming -- frequently bill for work that wasn't in the original scope without formal change order approval. When controls sub invoices arrive above PO, they either get approved informally or disputed late. Both outcomes hurt margin.

How SPM Fixes It

The Financial Systems That Solve This.

SPM builds these systems through ControlQore during the first 30-60 days of onboarding -- then maintains them monthly.

Division-Level Job Costing

Separate cost codes for sheet metal, piping, and controls on every job

Labor tracked by division weekly -- not blended by job

Material coded to division at time of receipt

Monthly variance by division -- catch the losing division at Week 4

Fabrication Shop Rate

Set cost-per-hour rate for sheet metal shop

Charge jobs for shop hours based on duct quantity fabricated

Separate from general overhead

Produces accurate job cost and defensible division margin

Controls Subcontractor PO Management

Every controls scope item on a PO before work begins

Controls sub invoices matched to PO before approval

Variance above PO triggers immediate PCO or dispute

No informal scope additions without written approval first

Common Questions

FAQs.

How should mechanical contractors structure job costing for sheet metal, piping, and controls?

Each division should have its own cost codes within the job -- separate labor categories, separate material categories, separate subcontractor buckets. Monthly job cost reporting should show variance by division, not just by job total. This allows you to identify which division is running over and why -- while there's still time to adjust.

Should sheet metal fabrication be job cost or overhead for mechanical contractors?

Job cost. Fabrication labor and shop costs should be allocated to the jobs the shop produced for -- not run to general overhead. Set a cost-per-hour rate for shop time, track shop hours by job, and charge each job for its fabrication hours. This produces accurate job margins and correct overhead rate for bid markup.

How do mechanical contractors manage controls subcontractor cost overruns?

Every controls scope item needs a PO before work begins. When controls sub invoices arrive, they're matched to the PO before approval. Any invoice above PO amount requires a formal change order or dispute -- not informal approval. Controls subcontractors frequently expand scope verbally; the financial discipline is requiring paperwork before payment.

Josh Luebker

FRACTIONAL CFO · THE CONSTRUCTION CFO

Former commercial construction project manager and master electrician. Managed 150+ projects totaling $300M+ including Google data centers, military bases, hospitals, and high-rises. Now fractional CFO for commercial subcontractors doing $1M–$12M through Sulphur Prairie Management. About Josh → | LinkedIn →