Not every plumbing job is bid the same way. Residential work usually involves one decision-maker, a small scope, and fast turnaround. Commercial projects run through a general contractor, involve multiple trades, and follow strict specifications tied to the contract documents.
New construction plumbing adds another layer. On a ground-up commercial building, your work has to align with the schedules of framers, electricians, and HVAC crews.
Rough-in happens in phases, inspections gate your progress, and the plumbing system you install must match stamped drawings, not your own judgment on site.
The stakes are also higher. Commercial jobs often require bid bonds or a performance bond, and payment flows down from the owner through the general contractor, which stretches out payment terms.
A master plumber's license, proper insurance, and bonding capacity are frequently prerequisites just to submit.
That is exactly why larger jobs reward preparation. Contractors who treat bidding as a structured process, rather than a rushed guess, submit fewer bids that lose money and win more of the right jobs.
The bidding process below works for any commercial plumbing project, whether you are pricing a tenant build-out or a ground-up facility.
Each step feeds the next: the documents define the scope, the takeoff defines the quantities, the cost calculations define the price, and the proposal presents it all to the general contractor.
Skip a step and the errors compound. Follow all six, and your estimates get tighter with every bid you submit.
Every bid starts with the documents. Request the full set:
Read the plumbing specification sections closely, but do not stop there.
General conditions often hide requirements that cost real money, such as cleanup obligations, temporary water, or specific dispute resolution procedures.
Define the scope of work in writing before you price anything. List what you will do and, just as important, what you will not. Exclusions like excavation, fixtures supplied by the owner, or fire sprinkler tie-ins protect your margin and prevent change order fights later.
Check the commercial terms too. Note the payment schedule, retainage percentage, and whether a performance bond is required. Visit the site if access is allowed.
Photos and field notes catch conditions the drawings miss, like limited staging room or an occupied building that forces night work.
If anything in the documents is unclear, submit a request for information before bid day. A documented answer beats an assumption every time.
The quantity takeoff turns drawings into numbers. Count every fixture, then measure pipe runs by size and material. Include hangers, valves, insulation, and equipment like water heaters or backflow preventers.
Note the model number for each specified fixture, because substitutions are rarely allowed on commercial work without approval.
Work systematically, one drawing sheet at a time, and mark off items as you count them. Whether you use digital takeoff tools or a scale ruler and highlighter, the discipline matters more than the method.
Most blown bids trace back to something missed at this stage, not bad math later.
Once quantities are set, price materials with current numbers from your suppliers.
Quotes from your supply house beat catalog pricing, especially on copper and cast iron, where the unit price can move between bid day and installation. Ask how long quotes are held and build that window into your bid.
Finally, check the totals. Compare fixture counts against the fixture schedule and confirm your pipe totals roughly match the building footprint. Five minutes of checking here can save five figures later.
Accurate cost calculations separate profitable contractors from busy ones. Break the estimate into three buckets and price each one on its own.
Labor costs come first. Estimate crew hours for each phase: underground, rough-in, top-out, and trim. Use your own historical production rates where you have them, since your crew's speed matters more than an industry average.
Apply fully burdened labor rates that include payroll taxes, workers' comp, and benefits, not just base wages.
Material costs come straight from your takeoff and supplier quotes. Add sales tax, freight, and a waste factor appropriate to the material.
Some contractors cross-check their totals with fixture pricing, dividing the total cost by fixture count to see whether the number lands in a reasonable range for that building type.
Overhead costs are the bucket most plumbing business owners underprice. Your office rent, estimating time, vehicles, insurance, software, and unbillable hours all have to be recovered by the jobs you win.
Calculate your annual overhead, divide it by your expected billable volume, and apply that percentage to every estimate.
Add subcontractor quotes, equipment rental, and permit fees, and you have your true cost baseline before profit.
Markup is not profit margin, and confusing the two costs contractors real money. Markup is the percentage you add to costs. Margin is the percentage of the final price that is profit. A 20% markup produces roughly a 17% margin, so know which number you are actually targeting.
Set your margin deliberately. Consider how badly you want the project, how full your schedule is, and how much risk the contract shifts onto you. A job with an aggressive timeline, heavy liquidated damages, or a difficult general contractor deserves a higher margin, not a discount.
Resist the race to the bottom. Being the low bidder on every project is a sign you are leaving money out of your estimates, not a sign of efficiency.
A successful plumbing business wins work at prices that fund growth, equipment, and good workers. Competitive bids are accurate bids, not the cheapest ones.
As a business owner, track your margins by project type over time. If new construction consistently underperforms service work, that data should shape both your pricing and which invitations you accept. Bid the jobs your numbers say you win profitably.
The proposal is where your estimate becomes a sales document. First impressions matter, and a general contractor sorting through a stack of detailed bids will notice the one that looks organized and complete.
Structure it in a consistent order. Start with a cover page that carries your company name, logo, license number, contact information, and the project title.
Follow it with an executive summary, two or three short paragraphs covering your approach, timeline, and price. Write the summary last, even though it appears first, so it reflects the finished numbers.
The body should restate the scope of work, list your exclusions clearly, and present the price. Include a payment schedule tied to key milestones, such as underground complete, rough-in inspection passed, and final trim.
Spell out your proposed payment terms and how long the price is valid, since material quotes expire.
Attach your license, insurance certificates, and bond information if required. Then submit exactly the way the invitation instructs, before the deadline, in the requested format.
A strong bid delivered late or to the wrong portal is a lost bid. Confirm receipt the same day so you know your proposal is in the running.
Most plumbing contractors stop working a bid the moment they hit send. That is where jobs are lost. General contractors often shortlist several bidders, ask clarifying questions, and negotiate scope before awarding.
If you are unreachable or slow to respond during that window, the award drifts to whoever stays engaged.
Set a follow-up schedule for every submission. Check in a few days after the bid date, answer scope questions quickly, and make it easy to reach your estimator. Polite persistence signals reliability, which is exactly what a general contractor wants from a subcontractor.
Just as important, track every outcome. Log each bid, the price, the competition when known, and whether you won or lost. Over time, this record shows your real hit rate by project type and customer, which tells you where a steady stream of winnable work actually comes from.
Review the numbers monthly. If you win one bid in twenty, your price or your target projects need to change. If you win most of what you bid, your margins may be too thin. Tracking turns every loss into pricing data, and that data wins you more jobs next quarter.
The six steps above only pay off if you run them on every bid, every week, without letting opportunities slip away. That is a process problem, and spreadsheets break down fast once you are juggling a dozen active bids with different due dates, contacts, and follow-up schedules.
This is where purpose-built plumbing software earns its keep. Followup CRM is a construction CRM built for specialty trade contractors, and it manages the exact workflow this guide describes.
Every lead and plumbing project enters one pipeline, so nothing sits forgotten in an inbox. The digital bid calendar keeps every due date visible to the whole team, and automatic reminders prompt the follow-up calls that Step #6 depends on.
The proposal generator builds branded proposals and sends them for e-signature, which helps you save time on the document assembly work in Step #5.
Sales and estimating dashboards show your hit rate and pipeline in real time, turning your bid tracking into the pricing data that sharpens future margins.
For work you win, Followup CRM integrates with Procore, so awarded projects push from your sales pipeline into Procore for project management without re-entering data. Bidding software should connect winning the job with delivering it, and that handoff does exactly that.
Followup CRM is build to help track every lead, keep every bid deadline on one calendar, send professional proposals faster, and follow up until the decision is made.
The contractors who win consistently are rarely the cheapest. They are the ones who never let a bid go cold.
Request a demo call to see the platform with your own pipeline in mind. Bring your current bid list and your biggest bottleneck, whether that is missed follow-ups, scattered spreadsheets, or proposals that take too long to build, and see how the system handles it.
Start by reviewing the full bid documents and defining your scope of work in writing. Perform a quantity takeoff, price labor, materials, and overhead separately, then apply a markup that hits your target profit margin.
Submit a professional proposal with a cover page, executive summary, and payment schedule, then follow up until the award decision is made.
The most expensive mistakes are missed takeoff items, underpriced overhead, and confusing markup with margin. Process mistakes cost just as much: missing bid deadlines, skipping the follow-up window after submission, and never tracking win rates by project type.
A system like Followup CRM removes the process failures with a shared bid calendar, automatic reminders, and reporting that shows which bids you actually win.
Build the price from the bottom up.
Take material quantities from your takeoff and price them with current supplier quotes, estimate crew hours using your own production rates with fully burdened labor costs, and add your calculated overhead percentage.
Then apply a deliberate profit margin based on project risk and how full your schedule is.