This post is part of our What Does a QS Include in a Cost Estimate? series. For the full guide to professional construction pricing, read our QS Cost Estimate Breakdown.

Table of Contents

• Introduction
• 1. Guessing Risks Underpricing
• 2. It Undermines Trust
• 3. It Leaves No Room for Overhead or Profit
• 4. Leads to Poor Cash Flow and Job Stress
• 5. It Encourages Bad Clients
• Conclusion: Stop Guessing, Start Estimating

Introduction

“I can get you a number by tomorrow.” Sound familiar? Quick quoting feels productive, but it’s often a trap. Without a detailed estimate, you risk underpricing, eroding trust, and damaging your business’s financial health.

1. Guessing Risks Underpricing

Without proper take-offs, it’s easy to miss materials or underestimate labour. This leads to change orders, overtime, and lost profit. Studies have shown that errors in estimating can result in a 3% profit loss in won tenders.

For a deeper look at the real-world consequences of mispricing, see Why Accurate Estimates Matter More Than You Think.

2. It Undermines Trust

Clients notice when the quote doesn’t match the final invoice. Poor detail leads to client skepticism and disputes. Clear, structured pricing shows clients you’re serious and professional, increasing conversions.

Want to understand the difference between quoting and proper estimating? Read our quoting vs estimating guide to learn how solid estimates protect your reputation and profit.

3. It Leaves No Room for Overhead or Profit

Guess quotes often exclude markup entirely. You work hard, but you don’t get paid properly. A professional Quantity Surveyor (QS) ensures that every cost is accounted for, and that your margin is protected from the start.

4. Leads to Poor Cash Flow and Job Stress

Scrambling to cover shortfalls from one job to the next often ends in burnout or reputational damage. A QuickBooks survey found that 30% of construction firms failed to achieve their expected profits, and 40% lacked confidence in their pricing estimates. Inaccurate budgeting doesn’t just hurt your bottom line, it creates a ripple effect that impacts supplier payments, wages, and job delivery.

Construction cash flow problems can cause failure to make payments, restrict business growth, and reduce profit margins, sometimes leading to insolvency. 

5. It Encourages Bad Clients

Lowball quotes attract bargain hunters, not quality customers. Professional clients respect professional pricing. Clear, detailed estimates help attract clients who value quality and are willing to pay for it.

Conclusion: Stop Guessing, Start Estimating

Quick quoting might save time upfront, but it can cost you in the long run. Invest in detailed, accurate estimates to protect your profit, build trust with clients, and ensure the sustainability of your business.

We know it’s easy to fall into quick-quote habits, especially when you’re busy. But even small improvements in your estimating process can dramatically reduce stress and improve your cash position. It’s not about being perfect, it’s about getting better each time.

Frequently Asked Questions

Why is quick quoting risky?

Quick quoting often leads to underpricing, missed costs, and eroded profit margins. It can also damage client trust and lead to disputes.

How does inaccurate estimating affect cash flow?

Inaccurate estimates can lead to unexpected expenses, causing cash flow issues that may result in delayed payments and financial strain.

What are the benefits of professional estimating?

Professional estimating ensures all costs are accounted for, protects profit margins, builds client trust, and supports sustainable business growth.

How can I improve my estimating process?

Use detailed take-offs, keep up-to-date with material and labour costs, and consider investing in estimating software or consulting a QS.

What should be included in a detailed estimate?

A detailed estimate should include direct job costs, overhead, profit margins, contingencies, and clear terms and conditions.

Can professional estimates help attract better clients?

Yes. Detailed, transparent estimates demonstrate professionalism and attract clients who value quality and are willing to pay for it.

How does underpricing affect my business?

Underpricing can lead to financial losses, cash flow problems, and damage to your reputation, making it harder to sustain and grow your business.

Is it worth investing time in detailed estimates?

Absolutely. While it may take more time upfront, detailed estimates protect your profit, reduce disputes, and support long-term business success.