Contractor Business Guide
How to Bid Contractor Jobs: The Complete Guide
Most contractors either underbid and lose money, or overbid and lose jobs. The difference between struggling and thriving comes down to knowing how to bid accurately, price for profit, and win the right work at the right price.
Bidding Quick Facts
- Average win rate: 25-35% residential
- Typical markup: 50-70% on direct costs
- Bid validity: 30 days standard
- Time to estimate: 2-8 hours per bid
- Common mistake: Underestimating labor hours
- Best practice: Qualify leads before bidding
Quick Answer
Calculate direct costs (materials + labor + subs), add overhead (25-45%), then add profit margin (15-25%). A $10,000 job with 35% overhead and 20% profit margin should bid at $16,875. Qualify leads before bidding, track your win rate, and aim for 25-35% close rate.
What Is a Contractor Bid?
A bid is a formal offer to complete work at a specific price. Unlike casual estimates, bids are commitments. Once accepted, you are obligated to perform the work at the stated price. Understanding this distinction helps you know when to give rough numbers and when to put together a real bid.
Bid vs Estimate vs Quote
| Term | Definition | Binding? | When to Use |
|---|---|---|---|
| Estimate | Rough projection of costs, often a range | No | Initial conversations, phone inquiries |
| Quote | Specific price for defined scope | Usually | Smaller jobs, repeat customers |
| Bid | Formal estimate with all terms | Yes | Competitive situations, formal RFPs |
| Estimate | Bid plus presentation and value positioning | Yes | High-value residential, design-build |
Why Terminology Matters
Using “estimate” for a firm price can create legal liability. Using “bid” for a rough number sets wrong expectations. Be deliberate about which term you use and what it means to you and the customer.
When to Bid vs Walk Away
Not every lead deserves a full bid. Bidding takes time and money. Before investing hours in an estimate, ask qualifying questions:
- Budget reality: Does the customer have a realistic budget for what they want?
- Decision maker: Is the person you’re meeting with able to sign a contract?
- Timeline: Does their timeline match your availability?
- Job fit: Is this the type of work you do well and profitably?
- Competition: Are they getting 10 bids or just 2-3?
Many successful contractors bid only 40-60% of the leads they receive. The others are filtered out through qualifying questions, saving hours of estimating time on jobs they were unlikely to win or wouldn’t want anyway.
Types of Contractor Bids
Different situations call for different bidding approaches. Each type has trade-offs between risk, profit potential, and customer preference.
Fixed Price (Lump Sum)
One price for the entire job, regardless of actual costs. You carry the risk but keep extra profit if efficient. Most common for residential work. Requires accurate estimating.
Time & Materials (T&M)
Bill actual costs plus markup. Customer carries the risk. Good for uncertain scope or repair work. Requires trust and transparent tracking. Often capped at a maximum.
Cost Plus
Actual costs plus percentage markup or fixed fee. Similar to T&M but often for larger projects. Requires open-book accounting. Customer sees all invoices.
Unit Price
Price per unit of work (per square foot, per fixture, per linear foot). Good when quantities are uncertain but unit work is consistent. Common in commercial bidding.
When to Use Each Type
| Bid Type | Best For | Avoid When | Typical Margin |
|---|---|---|---|
| Fixed Price | Clear scope, defined plans, competitive bids | Hidden conditions, vague scope, older homes | 15-25% |
| Time & Materials | Repairs, troubleshooting, uncertain scope | Budget-conscious customers, new relationships | 20-35% on labor, 15-25% on materials |
| Cost Plus | Design-build, high-trust relationships, custom work | Competitive bids, price-sensitive buyers | 15-20% fee or 10-15% markup |
| Unit Price | Commercial, government, quantity-uncertain work | Complex scope, many variables | Varies by unit |
Hybrid Approaches Work
Many contractors use fixed price for defined work and T&M for additions or unforeseen conditions. This protects both parties while keeping the base project predictable.
The Bidding Process: Step by Step
A systematic bidding process produces more accurate estimates, faster turnaround, and better win rates. Here is the process used by successful contractors:
Qualify the Lead
Before visiting the property, ask qualifying questions by phone. Confirm budget range, timeline, decision-making process, and job scope. This takes 5-10 minutes and can save hours of wasted site visits.
Site Visit and Measurements
Visit the property with a checklist. Take accurate measurements, photograph existing conditions, note access challenges, and identify potential complications. The more thorough now, the fewer surprises later.
Material Takeoff
List all materials needed with quantities and current pricing. Add 5-10% waste factor. Get supplier quotes for large orders. Don’t forget fasteners, consumables, and small items that add up.
Labor Estimation
Break the job into tasks. Estimate hours per task based on your production rates. Multiply by fully burdened labor rate (wages + workers comp + payroll taxes + benefits). Add supervision time.
Add Overhead and Profit
Apply your overhead rate to direct costs, then calculate the selling price to achieve your target profit margin. Use the formula: Price = Total Cost ÷ (1 – Target Margin).
Create and Present Estimate
Document scope, timeline, payment terms, warranty, and exclusions. Present in person when possible to answer questions, address concerns, and build rapport. Follow up within 48 hours.
Don’t Skip Steps
Rushing the process leads to missed items, inaccurate estimates, and lost money. The contractors who consistently profit take the time to bid thoroughly, even when busy.
How to Calculate Your Bid
Accurate bidding requires understanding your true costs and pricing for profit. Most contractors who struggle financially are not covering their overhead in their bids.
Bid Price Formula
Bid Price = (Materials + Labor + Subs) × (1 + Overhead Rate) ÷ (1 – Target Margin)
Breaking Down the Formula
| Component | What It Includes | Typical Range |
|---|---|---|
| Materials | All materials including tax, delivery, and waste factor | Actual cost + 5-10% waste |
| Labor | Hours × fully burdened rate (wages + WC + taxes + benefits) | $35-$85/hour burdened |
| Subcontractors | Sub invoices, sometimes with coordination markup | Actual cost + 0-15% markup |
| Overhead Rate | Insurance, vehicles, office, admin, marketing, owner salary | 25-45% of direct costs |
| Profit Margin | Net profit after all costs | 15-25% of selling price |
Example Calculation
Let’s calculate a bid for a bathroom remodel:
- Materials: $4,200 (including tax and waste)
- Labor: 48 hours × $55/hour burdened = $2,640
- Subcontractors: $1,800 (plumber + electrician)
- Direct Costs Total: $8,640
Now add overhead and profit:
- With 35% overhead: $8,640 × 1.35 = $11,664 total cost
- For 20% profit margin: $11,664 ÷ 0.80 = $14,580 bid price
- Profit: $14,580 – $11,664 = $2,916 (20% of selling price)
Use Our Calculator
Don’t do this math by hand every time. Use our Bid Calculator to quickly calculate prices with your specific overhead and profit targets.
Fully Burdened Labor Rate
Your labor rate isn’t just wages. Calculate the true cost:
| Cost Component | Example (for $25/hr worker) |
|---|---|
| Base hourly wage | $25.00 |
| Payroll taxes (7.65%) | $1.91 |
| Workers comp (varies by trade, 8-25%) | $4.00 |
| Benefits/PTO allowance | $2.50 |
| Unemployment insurance | $0.75 |
| Fully Burdened Rate | $34.16 |
The worker earns $25/hour but costs you $34.16/hour. Many contractors use the $25 figure in bids and wonder why they don’t make money.
Bidding by Trade
Different trades have different cost structures, production rates, and bidding conventions. Here are quick guidelines by trade:
| Trade | Primary Pricing Method | Key Cost Drivers | Typical Markup |
|---|---|---|---|
| Roofing | Per square + complexity factors | Pitch, layers, access, material type | 50-75% |
| HVAC | Equipment + labor flat rate | Equipment cost, ductwork, access | 40-65% |
| Plumbing | Flat rate book + complexity | Fixture count, access, material type | 45-70% |
| Electrical | Per device + service/panel | Panel size, circuits, access, code | 45-65% |
| Remodeling | Detailed line-item + contingency | Scope complexity, selections, unknowns | 55-80% |
Trade-Specific Bidding Guides
For detailed guidance on bidding specific types of work, see our trade guides:
Common Bidding Mistakes
These mistakes cost contractors thousands of dollars per year. Avoid them:
Underestimating Labor
The #1 mistake. Contractors consistently underestimate how long work takes. Track actual hours vs estimated on every job and adjust your rates.
Forgetting Small Items
Fasteners, caulk, tape, blades, fuel, dumpster fees, permit costs. These “small” items can add 5-15% to job cost. Use a checklist.
Not Including Overhead
Bidding materials + labor + “a little profit” ignores the 25-45% overhead cost of being in business. This is why contractors stay busy but broke.
Confusing Markup and Margin
A 20% markup yields only 16.7% margin. To achieve 20% profit margin, you need 25% markup. This confusion costs thousands per job.
Bidding on Every Lead
Time spent bidding jobs you won’t win or don’t want is wasted. Qualify leads first. Better to bid fewer jobs more thoroughly.
No Change Order Process
Scope creep kills profits. Any work beyond original scope needs a signed change order with additional cost before proceeding.
The Real Cost of Low Bids
Contractors who consistently underbid often cut corners, use cheaper materials, rush work, or skip proper cleanup. This leads to callbacks, warranty claims, and reputation damage. Price for quality and profit, or don’t bid at all.
For a complete breakdown of bidding mistakes and how to avoid them, see our detailed guide: Common Contractor Bidding Mistakes
Improving Your Bid Win Rate
Your bid win rate reveals how well you’re targeting and converting the right leads. Tracking and optimizing this metric is essential for growth.
What’s a Good Win Rate?
| Win Rate | What It Means | Action |
|---|---|---|
| Below 15% | Wasting time on bad leads or priced too high | Better lead qualification, review pricing |
| 15-25% | Typical for commercial, competitive residential | Focus on estimate quality, follow-up |
| 25-35% | Sweet spot for most residential contractors | Maintain quality, optimize lead sources |
| 35-50% | Strong positioning, could potentially raise prices | Test price increases on new leads |
| Above 50% | Probably leaving money on the table | Raise prices, you’re too cheap |
How to Improve Win Rate
- Better lead qualification: Stop bidding on jobs you won’t win. Ask budget, timeline, and decision-making questions upfront.
- Faster response time: Leads go cold quickly. Respond within hours, not days. First to respond often wins.
- Professional estimates: Detailed, clear estimates with photos win more than handwritten estimates.
- Present in person: When possible, present bids face-to-face to answer questions and build trust.
- Follow up systematically: 80% of sales happen after the 5th follow-up. Most contractors give up after one.
- Ask why you lost: When you lose a bid, ask why. Feedback improves future bids.
Track your win rate with our Bid Win Ratio Calculator and Construction Bid Win Rate Benchmarks.
Bidding Tools and Software
The right tools make bidding faster and more accurate. Here’s what successful contractors use:
Essential Bidding Tools
Estimating Software
Digital takeoff, material databases, labor rate calculations. Saves hours per bid and reduces errors. BuildFolio, JobNimbus, and others offer integrated estimating.
Digital Measurement
Laser measurers, tablet apps for takeoff, aerial measurement tools for roofing. More accurate than tape measures and faster for large areas.
Estimate Software
Professional templates, e-signature, payment integration. Digital estimates have higher close rates than paper. BuildFolio estimates are designed for contractors.
CRM for Follow-Up
Track every lead, bid, and follow-up. Automated reminders ensure nothing falls through the cracks. Essential for consistent sales process.
For a detailed comparison of estimating tools, see our Estimating Software Comparison Guide.
BuildFolio for Bidding
BuildFolio combines estimating, estimates, and job costing in one platform. Create accurate bids, send professional estimates, and track actual costs vs estimated to improve future bids.
Frequently Asked Questions
What is the difference between a bid and an estimate?
An estimate is an educated projection of costs, often given verbally or as a rough range. A bid is a formal, binding offer to complete work at a specific price. Estimates help qualify opportunities while bids are submitted to win contracts. Some bids are firm-fixed price while others allow for adjustments based on actual conditions. Use “estimate” for early conversations and “bid” when you’re ready to commit to a price.
How do you calculate a contractor bid?
Calculate direct costs (materials + labor + subcontractors), add overhead allocation (25-45% of direct costs), then add profit margin (15-25%). Formula: Bid Price = Direct Costs × (1 + Overhead Rate) ÷ (1 – Target Profit Margin). For example, $10,000 direct costs with 35% overhead and 20% margin = $10,000 × 1.35 ÷ 0.80 = $16,875 bid. Always include a contingency buffer for unforeseen conditions.
What is a good bid win rate for contractors?
A healthy bid win rate is 25-35% for residential contractors and 15-25% for commercial work. Below 15% suggests you’re wasting time on bad-fit leads or priced too high. Above 50% often means you’re leaving money on the table by pricing too low. Track your win rate by lead source and job type to optimize. Use this data to qualify better and adjust pricing.
Should I bid on every job?
No. Bidding costs time and money. Each bid takes 2-8 hours of your time. Focus on jobs that match your expertise, have realistic budgets, and come from quality leads. Use qualifying questions to filter before investing in full estimates. Many successful contractors bid only 40-60% of the leads they receive and focus their energy on winning the right jobs.
How do I compete against lowball bids?
Don’t compete on price alone. Differentiate through professionalism, detailed estimates, warranties, references, and communication. Explain what’s included in your bid that others might skip. Often the lowest bidder cuts corners on quality, insurance, or labor. Let homeowners know the risks of choosing the cheapest option. If a customer only cares about price, they’re probably not your ideal customer.
What markup should contractors use?
Most contractors need 50-70% total markup on direct costs to cover overhead (25-45%) and profit (15-25%). A common mistake is using 10-20% markup, which doesn’t cover true overhead. Use the formula: Required Markup = (Overhead Rate + Profit Margin) ÷ (1 – Profit Margin). For 35% overhead and 20% profit: (0.35 + 0.20) ÷ (1 – 0.20) = 0.6875 = 68.75% markup needed.
How long should a bid be valid?
Standard bid validity is 30 days for most residential work. Commercial and larger projects often require 60-90 day validity. Always state expiration date on bids. Material prices can change rapidly, so shorter validity periods protect you from price increases. Include language allowing price adjustment if materials increase more than 5-10% before acceptance.
What should be included in a contractor bid?
A complete bid includes: detailed scope of work description, materials list (brands/models when relevant), labor breakdown, project timeline with milestones, payment schedule, warranty information, insurance documentation, exclusions (what’s NOT included), bid validity date, and terms and conditions. More detailed bids win more often because they demonstrate professionalism and reduce customer uncertainty.
Are You Actually Profitable?
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