2018 National Plumbing & HVAC Estimator: James A. Thompson’s 2017 Guide

Are you a contractor struggling to win bids because your estimates are either too high to compete or too low to ensure a profit? In the volatile construction market, guessing your material and labor costs can be a fatal mistake for your business. The 2018 National Plumbing & HVAC Estimator by James A. Thompson, published in late 2017, stands as a critical resource designed to solve this exact problem, providing the precise data needed to secure profitable projects.

Whether you are a seasoned plumbing veteran or a new HVAC specialist, having access to nationally averaged cost data is the difference between a signed contract and a lost opportunity. This guide dives deep into why this specific estimator remains a benchmark in the industry, how to utilize its data effectively, and what makes James A. Thompson’s methodology so trusted by professionals across the United States.

Why the 2018 Edition by James A. Thompson Matters

The construction industry moves fast, but cost data from five years ago simply doesn’t apply to today’s market realities. The 2018 National Plumbing & HVAC Estimator, prepared by James A. Thompson in 2017, was released at a pivotal time when material costs were beginning to fluctuate due to global supply chain shifts and changing labor regulations.

The Authority of James A. Thompson

James A. Thompson is not just a name on a cover; he is a recognized authority in construction cost estimation. His approach combines rigorous data collection with practical field experience. Unlike generic spreadsheets found online, Thompson’s estimators are built on thousands of actual project quotes from across the nation.

When you use this specific edition, you aren’t just getting numbers; you are accessing a curated database that accounts for:

• Regional labor rate variations.
• Specific material grade costs (from standard PVC to high-end copper).
• Equipment overhead and depreciation.

Pro Tip: Always verify if your local jurisdiction has codes that exceed national standards, as this may require adjusting the base figures provided in the 2018 edition.

Timing is Everything: The 2017 Publication Context

You might wonder why a book published in 2017 is titled the 2018 Estimator. This is standard industry practice. Estimators are released in the fourth quarter of the preceding year to allow contractors to prepare their budgets and bid strategies for the upcoming calendar year. The data within the 2017-published edition reflects end-of-year 2017 pricing, projected for 2018 trends.

For historical analysis or for understanding baseline costs before the massive inflation spikes of the 2020s, this edition serves as an excellent comparative tool. It allows contractors to see the trajectory of cost increases over the last decade.

Key Features of the National Plumbing & HVAC Estimator

What exactly is inside this comprehensive guide? The structure is designed for quick reference during high-pressure bidding situations.

Comprehensive Unit Price Data

The core of Thompson’s work is the unit price list. This isn’t just a material list; it is a fully loaded cost per unit.

• Labor Included: Every price factors in the hours required for installation.
• Material Included: From the pipe itself to the fittings, glue, and hangers.
• Overhead & Profit: Many editions include columns showing costs with and without O&P, giving you flexibility in how you present your bid.

Detailed Breakdown by System

The book is meticulously organized by system type, making it easy to find exactly what you need:

1. Water Supply Systems: Copper, PEX, CPVC, and galvanized steel.
2. Drain, Waste, and Vent (DWV): Cast iron, PVC, and ABS piping.
3. HVAC Ductwork: Sheet metal, flexible ducts, and insulation.
4. Fixtures and Appliances: Toilets, water heaters, furnaces, and AC units.

Comparison: Digital Tools vs. Thompson’s Estimator

While software is powerful, many contractors keep a physical copy of Thompson’s estimator as a “sanity check.” If your software says a water heater install is $500, but Thompson’s 2018 data says $1,200, you know immediately to re-evaluate your digital inputs.

How to Use This Estimator for Accurate Bidding

Using the 2018 National Plumbing & HVAC Estimator effectively requires more than just flipping pages. You must adapt the national averages to your specific local context. Here is a step-by-step tutorial on how to generate a bid using this resource.

Step 1: Define the Scope of Work

Before opening the book, clearly outline every task. Are you replacing just the water heater, or are you upgrading the gas line and venting as well? Ambiguity here leads to missed costs later.

Step 2: Locate the Base Unit Cost

Find the specific line item in Thompson’s guide.

• Example: Look for “Install 40-gallon gas water heater.”
• Let’s assume the book lists a base cost of $1,150.00 (hypothetical figure based on 2018 data trends).

Step 3: Apply the City Cost Index

This is the most critical step. National averages do not apply equally in New York City and rural Kansas. The estimator includes a City Cost Index table.

• Find your city or the nearest major metropolitan area.
• Identify the index percentage for “Plumbing” or “HVAC.”
• Calculation: If your city index is 115.5%, multiply the base cost by 1.155.
  • $$1,150.00 \times 1.155 = $1,328.25$

Step 4: Adjust for Job Conditions

Thompson’s data assumes standard installation conditions. You must manually adjust for:

• Difficulty: Working in a cramped crawl space vs. an open basement.
• Height: Multi-story buildings requiring scaffolding.
• Timeline: Rush jobs requiring overtime pay.

Add a contingency percentage (usually 5–10%) for these variables.

Step 5: Calculate Total Bid

Sum up all adjusted line items. Add your desired profit margin if it wasn’t included in the unit cost column. Present this clear, data-backed number to your client.

For more information on the history of construction standardization, you can refer to general industry resources like Wikipedia.

Common Mistakes When Using Cost Estimators

Even with a high-quality resource like the 2018 National Plumbing & HVAC Estimator by James A. Thompson, errors happen. Avoid these common pitfalls:

• Ignoring Local Codes: The estimator follows national codes (like IPC or IMC). If your state requires extra straps, specific valve types, or higher efficiency ratings, the material cost will be higher than the book states.
• Forgetting Waste Factors: The book lists net quantities. In the real world, you cut pipes and make mistakes. Always add 5–10% for material waste.
• Using Outdated Labor Rates: While the 2017/2018 data was accurate then, labor rates have risen significantly since. Use the book’s hours estimate, but consider updating the hourly wage component to match current 2026 market rates.
• Overlooking Overhead: Many new contractors forget to factor in their truck payment, insurance, and office software. Ensure these are covered in your final markup.

FAQ: Frequently Asked Questions

1. Is the 2018 National Plumbing & HVAC Estimator still relevant in 2026?

While the specific dollar amounts in the 2018 National Plumbing & HVAC Estimator are outdated due to inflation and supply chain changes, the methodology and labor hour estimates remain highly relevant. Contractors often use the book to determine how many hours a job should take, then apply current local labor rates to get an accurate 2026 price.

2. Who is James A. Thompson?

James A. Thompson is a renowned construction estimator and author who has compiled decades of cost data into the “National Estimator” series. His work is widely regarded as the gold standard for residential and light commercial construction bidding in the United States.

3. Does this book cover both plumbing and HVAC?

Yes, the title 2018 National Plumbing & HVAC Estimator indicates it covers both trades comprehensively. It includes separate sections for plumbing systems (water, waste, gas) and HVAC systems (ductwork, heating units, cooling systems), making it a versatile tool for general mechanical contractors.

4. How do I adjust the prices for my specific city?

The book contains a “City Cost Index” section. You locate your city (or the closest major city) and apply the indicated percentage multiplier to the national average prices listed in the main tables. This adjusts the costs to reflect local labor and material market conditions.

5. Can I use this for commercial high-rise projects?

This estimator is primarily designed for residential and light commercial projects. For large-scale commercial high-rises, the complexity, union labor requirements, and specialized equipment often necessitate more detailed, project-specific estimating software or specialized commercial cost databases.

6. Where can I buy the 2018 edition if it is out of print?

Since newer editions are released annually, the 2018 version may be out of print at major bookstores. However, it can often be found through used book sellers, online marketplaces like eBay or Amazon Marketplace, or at local construction library sales. For current bidding, purchasing the latest edition is recommended.

Conclusion

Mastering the art of estimation is the backbone of a profitable contracting business. The 2018 National Plumbing & HVAC Estimator by James A. Thompson (published in 2017) offers a foundational framework that continues to assist contractors in understanding the components of a accurate bid. While specific prices evolve, the logic, labor benchmarks, and systematic approach provided by Thompson remain invaluable.

By combining this trusted resource with your local market knowledge and current pricing, you can create bids that are competitive enough to win work but robust enough to ensure a healthy profit margin. Don’t leave your bottom line to chance—arm yourself with data.

Found this guide helpful? Share this article with your fellow contractors on LinkedIn, Facebook, or Twitter to help them improve their bidding accuracy today! Let’s build a more profitable industry together.