Here is one of the most expensive mistakes a contractor can make: quoting a job with a "20% profit" when you actually applied a 20% markup. You didn't earn 20% profit. You earned 16.7%. On a $500,000 annual revenue, that confusion alone costs you $16,500 every year — and most contractors never catch it.
Contractor targets 20% profit. Adds 20% to costs. Thinks the job is profitable. But 20% markup = 16.7% margin. The math is wrong before the job even starts.
Markup is the percentage added on top of your cost. It is calculated based on what you spent, not what you charged.
Simple enough. The problem is that markup percentage is not the same as your profit percentage. Contractors commonly say "I want 25% on this job" meaning they want 25% profit — but then they calculate markup and apply the wrong number.
Gross margin (also called profit margin) is calculated based on your revenue, not your cost. It tells you what percentage of every dollar you charge is actual profit.
Same job. Same numbers. 25% markup. But only 20% margin. This is the gap that matters.
| Markup Applied | Cost | Bid Price | Gross Profit | True Margin |
|---|---|---|---|---|
| 10% | $10,000 | $11,000 | $1,000 | 9.1% |
| 15% | $10,000 | $11,500 | $1,500 | 13.0% |
| 20% | $10,000 | $12,000 | $2,000 | 16.7% |
| 25% | $10,000 | $12,500 | $2,500 | 20.0% |
| 33% | $10,000 | $13,300 | $3,300 | 24.8% |
| 50% | $10,000 | $15,000 | $5,000 | 33.3% |
If you want a specific profit margin, use this formula to find the correct bid price:
Bid Price = Total Cost ÷ (1 − Target Margin %)
Example: $10,000 cost, want 20% margin → $10,000 ÷ 0.80 = $12,500 bid
The markup vs. margin confusion becomes even more damaging when you factor in overhead. Most contractors add overhead as a percentage to their direct costs — but if they use markup math instead of margin math, they systematically under-recover overhead on every single job.
Consider a contractor with $80,000 annual overhead, $400,000 annual revenue, and 20% overhead rate. If they target a 20% profit margin but calculate it as a 20% markup, they lose $16,500 per year just from the math error — before accounting for any actual job problems.
The correct approach is to calculate your true all-in cost (direct costs + overhead allocation + contingency), then apply the margin formula to find the bid price that delivers your target profit:
Different trades have different standard markup ranges, but what matters is your specific overhead structure. These are industry reference points — not targets to blindly copy:
| Trade | Typical Markup | True Margin | Overhead Range |
|---|---|---|---|
| Electrical | 20–35% | 17–26% | 12–18% |
| Plumbing | 25–40% | 20–29% | 14–20% |
| Roofing | 20–40% | 17–29% | 15–22% |
| HVAC | 25–50% | 20–33% | 15–20% |
| General Contractor | 15–25% | 13–20% | 14–22% |
| Painting | 25–50% | 20–33% | 10–15% |
| Landscaping | 15–30% | 13–23% | 12–18% |
Enter your real costs, overhead rate, and target margin. Get the precise bid price, markup %, true margin, and break-even point — for your trade.
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Most contractors price jobs by adding a markup percentage to their costs. The problem is they often confuse the percentage they want to earn (margin) with the percentage they need to apply to costs (markup). Here is the correct process:
Step 1 — Calculate total direct costs. Add labor (burdened), materials, subcontractors, equipment, permits, and any other direct expenses. This is your cost base.
Step 2 — Add overhead. Multiply direct costs by your overhead rate (typically 15–22%). This recovers the cost of running your business — vehicles, insurance, office, admin.
Step 3 — Add contingency. Multiply direct costs by 5–10% for unforeseen conditions. On renovation or remodel work, use 10%. On clear-scope new construction, 5% is reasonable.
Step 4 — Apply the margin formula. Divide total cost base (direct costs + overhead + contingency) by (1 − your target margin). Example: $15,000 total cost base ÷ (1 − 0.20) = $18,750 bid price, delivering exactly 20% gross margin.
The markup-margin confusion shows up in four specific ways that cost contractors money:
Mistake 1 — Applying margin % as markup. "I want 20% profit" → adds 20% to costs → earns only 16.7% margin. On a $250,000 annual cost base, that's $8,250 in missing profit every year.
Mistake 2 — Not recovering overhead on every job. Treating overhead as a year-end accounting item instead of a per-job cost. If you don't recover overhead on every job, some jobs subsidize others — and slow months can sink you.
Mistake 3 — Using base wages instead of burdened labor. A $30/hr worker costs $39–42/hr fully burdened (FICA, workers' comp, benefits). Bidding with base wage means every labor hour loses $9–12 before material costs even hit.
Mistake 4 — Using a markup from years ago. Your overhead changes every year — new insurance rates, new vehicle payments, new hires. A markup that worked in 2022 may be dangerously thin today. Recalculate annually.
The correct markup isn't just a trade issue — it also depends on the type of project, the client relationship, and the risk profile of the work.
| Project Type | Typical Markup | Why |
|---|---|---|
| New residential construction | 15–20% | Clear scope, lower risk, volume builds efficiency |
| Residential remodel / renovation | 20–35% | Hidden conditions, occupied space, scope changes |
| Commercial construction (large) | 10–18% | Competitive bidding, high volume, thin but reliable |
| Service & repair work | 35–60% | Dispatch overhead, small jobs, urgency premium |
| Insurance restoration (Xactimate) | 10% O + 10% P | Industry-standard adjuster pricing, negotiated |
| Government / public works | 8–15% | Disclosed cost breakdowns, prevailing wages, compliance |
Save these. They belong on a notepad next to your estimating software: