How to Win More Plumbing Tenders (What Actually Separates the Winners)

SNZ Plumbing Estimating · 2025-02-02

You are quoting plenty of jobs. You put in the hours, you send the price, and the work goes to someone else. Again. So what are the plumbers who win tenders doing that you are not?

It is almost never just the price. After pricing and reviewing a lot of tenders, I can tell you the difference to win more plumbing tenders usually comes down to a handful of things most estimators get wrong, and one document nearly everyone skips.

Let me start with that document, because it is the most common mistake of all.

Read the scope document, not just the plans

Here is what happens on a huge number of tenders. The builder does not just give you the plans. He gives you a scope of works document as well. The intention is obvious: read the plans and read the scope.

But estimators are almost always in a hurry. They have too much work on and they want the price out as fast as possible. So they look at the plans and completely ignore the scope document.

That is a serious mistake, because the scope document often asks you to include things that are not shown anywhere on the plans. It might tell you to allow a provisional sum of fifteen thousand dollars for a particular item. It might tell you to allow for the tap-in to the water main. Allow for saw cutting of the concrete slab. Allow for reinstatement of the slab. Allow for acoustic lagging. Allow for heelsafe grates.

None of that may appear on the drawings. If you did not read the scope, you have left all of it out, and your competitor who read it has a more complete, more accurate price. The builder notices immediately who read the documents and who did not.

The big-ticket items plumbers leave out, and why that makes no sense

Beyond the scope document, there are specific items plumbers routinely miss, and the strange part is that these are often the items that would have made them the most money.

The usual culprits are the tap-in to the water main, saw cutting of the concrete slab, and acoustic lagging. The saw cutting is a classic. On a renovation where the plumber has to saw cut the floor for internal drainage, it gets ignored constantly, because it is a time-consuming part of the work that people would rather not think about. But leaving it out does not make it disappear. It just means you priced a job you cannot deliver for the number you gave.

The one that genuinely makes no sense is when plumbers leave out the pumps. These big-ticket items are exactly the ones that make you money on the job. If a pump package was thirty thousand dollars, you could have made thousands just by supplying it. Leaving it out is deliberately throwing away the opportunity to make money. It is out of all logic.

So the instinct that "leaving things out keeps my price competitive" is usually backwards. On the big-ticket items, leaving them out does not win you the job. It just strips out your profit and leaves you exposed.

When leaving items out is actually the smart move

Now, there is a flip side, and this is where real judgement comes in. Sometimes leaving an item out is exactly the right call.

The test is information. If there is no information to price something properly, allowing a number is a gamble, not an estimate.

Take a two million dollar job with five pumps in the scope, and none of them have duties or specifications on them. There is literally nothing to price against. Whatever you allow is a complete gamble. It could make you a lot of money, it could lose you a lot, or you might land it spot on by luck. When there is that little information, it is too much risk to carry, and the smart move is to exclude it and note clearly why, rather than bury a guess in your price.

The same goes for the unknowns on site. Rock excavation. Dewatering. Handling contaminated material. These are the things nobody can see until the ground is open, and pricing them blind is how contractors lose serious money. It is almost always better to exclude them, state that you have excluded them, and let them be dealt with as they arise.

And when the builder asks you to include supply of fixtures, do it. Yes, it is time consuming. But it makes you extra money and the builder appreciates a contractor who took the time. That willingness is itself a reason they remember you.

Follow up on every tender, it genuinely matters

After you submit, do not just sit back and wait. Following up matters, and not only for the reason most people think.

Of course it shows you are keen and that you care about working with the builder, and builders do appreciate that. If you do not care, if you just submit and never follow up, they will treat you exactly the same way in return. They will take your price, leave your quote sitting in their system, and it never converts into you actually getting the work.

But the bigger thing follow-up does is build the relationship. When you contact the contract administrator or the project manager at the builder, that person now knows your name. They know who you are and what you want. Do that consistently and you are no longer a random quote in the system, you are a name they recognise. That is how a one-off submission slowly turns into an ongoing relationship, and relationships are what win the tenders that price alone never will.

This connects to something worth understanding about how plumbing work is really won. Getting in front of builders in the first place, and staying on their radar, is its own skill. If that side is your challenge, it is worth reading how to actually market a plumbing business alongside this.

Do not win by being the cheapest

One last thing, because it underpins all of it. Winning more tenders is not about being the lowest number. With serious builders, being too cheap actively works against you, because it signals you do not understand the job. A price that reflects the true scope, with the big items in and the genuine unknowns clearly excluded, tells the builder you know exactly what you are dealing with.

That is the same reason the cheapest estimate is often the one that costs you most. Accurate and complete beats cheap and thin, every time, with the builders worth working for.

Where we come in

Reading every scope document, catching the big-ticket items, knowing which unknowns to exclude and why, presenting it all so the builder can see you have covered the job. That is exactly what we do, on every estimate, across residential, tier three, tier two, tier one and government infrastructure work.

We build you a submission that reads the scope as well as the plans, prices the items that make you money, excludes the genuine unknowns with clear reasons, and lays it out so you can put it in front of a builder with confidence. You can see how the hydraulic estimating service works, or look through the case studies for the range of jobs we price.

Because winning tenders is not about the lowest price. It is about being the contractor who clearly understood the whole job.

This article reflects the author's professional experience in hydraulic estimating across Australia. It is general information about tendering and pricing, not business or financial advice. Always price from the actual drawings and scope documents for your specific job. Last updated 6 July 2026.