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CONTROL: THE CONSTRUCTION FINANCIAL OPERATING SYSTEM 8 STEPS · 60 DAYS · YOUR BUSINESS FINALLY MAKES SENSE JOSH LUEBKER · MASTER ELECTRICIAN · $2.1B+ IN PROJECTS MANAGED TRADE CONTRACTORS FROM STARTUP TO $50M · AVAILABLE OCT 1, 2026 CONTROL: THE CONSTRUCTION FINANCIAL OPERATING SYSTEM 8 STEPS · 60 DAYS · YOUR BUSINESS FINALLY MAKES SENSE JOSH LUEBKER · MASTER ELECTRICIAN · $2.1B+ IN PROJECTS MANAGED TRADE CONTRACTORS FROM STARTUP TO $50M · AVAILABLE OCT 1, 2026
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Home / Trades / Interiors (General)
INTERIORS (GENERAL) CONTRACTORS
PHASE 6 · INTERIOR FINISHES

Why Interiors (General) Contractors Blur Five Trades Into One Number

QUICK ANSWER

Interiors contractors who self-perform several trades blur them into one job number and lose the ability to see which crew makes money. Scope boundaries drift as the GC pushes orphan work your way, and finish schedule sequencing stalls billing behind other trades. CONTROL costs each trade separately and prices every boundary move.

BY JOSH LUEBKER · UPDATED JUL 2026 · LIVE ON CONSTRUCTIONCFO.NET
DIRECTORY
← All 49 Trades
Every trade, organized by phase of work.
DONE FOR YOU
Interiors (General) Operating System →
The full SPM service build for this trade.
PROOF FROM A RELATED TRADE
$365K AR Recovered
Multi-phase building trade, same system.
THE CASH PROBLEMS

The specific ways interiors (general) contractors lose cash, pulled straight from what makes this trade different.

Multi-Trade Self-Perform Job Costing

Framing, drywall, ceilings, and doors on one job need their own cost codes. Blended, the profitable crew subsidizes the losing one and both stay invisible.

Scope Boundary Change Orders

Orphan scopes drift to the interiors contractor because you are already there. A priced change order before the crew starts keeps boundary drift billable.

Finish Schedule Sequencing Billing

Your phases interleave with every other finish trade, and their slips stall your billing. Phase-split billing lines keep completed work paid regardless.

THE FIX

The CONTROL chapters that solve this for interiors (general) contractors specifically.

CHAPTER 1
Job Cost Structure
Cost codes per self-performed trade and per phase.
CHAPTER 6
Project Management Standards
Boundary change orders and phase-split billing.
CHAPTER 5
Software & Bookkeeping
Books that report each trade's margin separately.
RELATED READING
NICHE OS
Why Jobs Look Profitable But Aren't
Why jobs look profitable while the bank disagrees.
NICHE OS
Why Trade Contractors Run Out of Cash
The master diagnosis every trade starts with.
SYSTEM HUB
Run On C.F.O.S.
All 8 steps of the CONTROL system.
QUESTIONS INTERIORS (GENERAL) CONTRACTORS ASK
Why do interiors contractors lose money self-performing multiple trades?
Interiors contractors lose money self-performing because five trades share one job number. The drywall crew can run 30% gross while the doors crew runs negative, and a blended report shows a comfortable average. Trade-level cost codes reveal which crews earn their keep, which is the first step to fixing the ones that do not.
How do I stop scope creep on an interiors package?
You stop scope creep with a boundary standard: any work outside the written scope gets a notice and a priced change order before a crew touches it. Chapter 6 of CONTROL supplies the templates and the escalation steps, so being the contractor already on site stops meaning being the contractor who works for free.
What profit margin should an interiors contractor target?
An interiors contractor should target 22 to 30% gross profit per project and 12% net profit after all expenses, with overhead between 9 and 13%, measured per self-performed trade. The blended number is a vanity metric, because the trade-level numbers are where the money is won or lost.
Josh Luebker, President, SPM The Construction CFO
JOSH LUEBKER
PRESIDENT · SPM THE CONSTRUCTION CFO

Josh Luebker is a former commercial construction project manager and master electrician. He has managed 150+ projects totaling $2.1B+, including Google data centers, military bases, hospitals, and high-rises. CONTROL is built on what works in the field.

Josh leads SPM The Construction CFO (Sulphur Prairie Management, LLC), the fractional CFO for commercial subcontractors.

SPM THE CONSTRUCTION CFO → LINKEDIN →

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