The Honest Truth About Plumbing Estimating Software (From Someone Who Actually Uses It)

SNZ Plumbing Estimating · 2025-02-03

There is no single best plumbing estimating software. There is only the best one for how you actually work, and every review that tells you otherwise was written by someone who has never priced a job under a Friday deadline.

It's 9pm. The tender closes Friday. You've got the drawings open on one screen, your takeoff software on the other, and an Excel sheet that's supposed to tie it all together. You insert one row to add a line you missed, and your whole sheet turns to garbage. If you've ever estimated a commercial plumbing job, you know this feeling. And no software review written by a marketer is going to warn you about it, because they've never sat where you're sitting.

I've spent years pricing hydraulic and civil work across Australia. High-rise residential, hospitals, government infrastructure, water authority packages. I've used these tools on real tenders with real deadlines and real money on the line. So this isn't a list of features copied off vendor websites. This is what actually happens when you use them.

Here's the honest version.

First, understand what estimating software actually does, and what it doesn't

There are two completely separate jobs in estimating, and most software only does one of them.

Job one is the takeoff. Measuring and counting off the drawings. How many metres of DN150 PVC. How many WCs, basins, floor wastes. How many bends, junctions, inspection openings.

Job two is the pricing. Taking those quantities and turning them into a real cost with materials, labour, plant, margin and prelims.

Most "estimating software" is really takeoff software. It's brilliant at measuring and counting. But the moment those numbers need to become a priced, defensible estimate that ties to a sell price, most people still end up in Excel. And that handoff between the two is where the pain lives. It is also where jobs are won or lost, because the cheapest estimate is usually the one that costs you the most.

Keep that split in your head as we go through the tools. It explains most of the frustration.

PlanSwift: fast, powerful, and it will corrupt your Excel sheet

I use PlanSwift. I started using it for a specific reason. It links directly into Excel, so your takeoff quantities flow straight into your pricing sheet. In theory, that's the dream. Measure on the drawing, watch the number appear in your priced BOQ.

In practice, that same Excel integration is the exact thing that gives me the most grief.

Here's the failure, and I want to describe it precisely because nobody else will. When PlanSwift is linked to your Excel file and you insert or delete a row in that sheet, it can corrupt the data. Say you've got 120 linear metres of 20mm copper sitting in its cell. When it breaks, it duplicates that 120 into the rows underneath "20mm copper." Suddenly the same quantity is smeared down through cells it has no business being in.

Now you've got two options, both bad. You either delete the whole sheet and start again, or you go hunting manually through every line trying to spot the duplications and correct them one by one. On a big tender, that's an hour of your night gone. And worse, it plants a seed of doubt. Did I catch all of them?

Is PlanSwift a bad tool? No. It's fast and it's capable. But you have to respect how fragile that Excel link is, and you have to work around it deliberately.

Cavsoft: solid, plumbing-focused, but the one-at-a-time problem

Cavsoft is good. It's built with a rate library so pricing can flow once you've set it up, and it's designed with our trade in mind rather than being a generic multi-trade tool.

My honest frustration with it is speed. Specifically, that in my experience you can't select multiple items and take them off simultaneously. You work through items one at a time. On a job with a lot of repeated fixtures and fittings, that one-at-a-time rhythm adds up. Every extra click, multiplied across a full commercial takeoff, is time you don't have at 10pm on a Wednesday.

If you price similar jobs over and over and you've invested in setting up the rate library, Cavsoft rewards that. But if raw takeoff speed on a big mixed scope is what you need, that limitation is real.

Buildsoft: where multi-select changes the game

Buildsoft is genuinely good at the thing Cavsoft struggles with. You can select many items at once and take them off in a single click.

Picture a bathroom takeoff. Instead of counting the WC, then the basin, then the shower, then the bath one at a time, you select all of them at once and click once, and it counts the lot. On a project with dozens of repeated bathrooms, that multi-select is a serious time saver.

Where Buildsoft really earns its place is supply-of-fixtures takeoffs. And this is where I want to teach you something that took me years to fully appreciate.

The thing nobody tells you: one basin is not one basin

Here's the insight that separates a takeoff that wins money from one that leaks it.

When you look at a drawing and see a basin, your instinct is to count "one basin." But on a real supply package, one basin is almost never one item. It's:

• The basin itself
• The basin mixer
• Possibly a bottle trap
• The connection set

That's not one line. That's an assembly. A group of items that all come together at that one fixture location.

Now scale it up to a whole bathroom. A shower isn't a shower. It's the shower rose, the shower mixer, the rail, sometimes a wall outlet. A WC is a pan, a cistern, a connector, a stop tap. A floor waste is a grate, a body, a puddle flange.

With software that supports multi-select assemblies, you build that bathroom group once, every component of every fixture, and then a single click counts all of it across every repeated bathroom on the job. With software that makes you click each item individually, you're doing that work item by item, fixture by fixture, room by room. On a hotel or a hospital, that's the difference between an afternoon and a full day. And every manual click is a chance to miss something.

This is the same thinking behind our materials order list service. Once the takeoff is done, every fixture assembly has to be broken back out into individual orderable items for the supplier. Getting that right is exactly where jobs either run smoothly or run short on site.

Cubit, CostX, Bluebeam and the takeoff-only crowd

You'll also hear about Cubit, CostX, Bluebeam and PlanSwift's competitors in the fast-takeoff space. These are strong measuring tools. Bluebeam in particular is everywhere, and for good reason. You can mark up drawings, measure lengths and areas, and produce a bill of quantities quickly.

But here's the honest limitation, and it's the same for all of them. They measure and they count. They do not work out your bedding, your embedment, your trench fill, or your spoil. They'll tell you how many metres of pipe are in the trench. They won't tell you how many tonnes of crushed rock you need to order or how many truckloads of spoil you're carting off site. That calculation, the one that actually decides whether your civil and stormwater trench pricing is right, you still do yourself.

So which one should you use?

Here's my honest take, and it's not the answer the affiliate blogs give.

There is no single best plumbing estimating software. There's the best one for how you work.

• If you live inside Excel and want quantities to flow straight into your priced sheet, PlanSwift does it, as long as you respect the Excel link and build empty rows into your template so you never have to insert one.
• If you price similar jobs repeatedly and want a plumbing-focused rate library, Cavsoft rewards the setup, if you can live with one-at-a-time takeoff.
• If takeoff speed on big mixed scopes matters, especially supply-of-fixtures work, Buildsoft's multi-select assemblies are hard to beat.
• If you just need fast, flexible measuring and you're comfortable pricing separately, Bluebeam and the takeoff-only tools do that job well.

But whichever you choose, remember the two-job split. The software gets you the quantities. Turning those quantities into an estimate that ties to a defensible sell price, with the right rates, the right margin, the prelims and the site conditions built in, that's still on you. That's the part that decides whether you win the job and make money on it, and it is where a lot of good plumbers quietly lose out because they never separate their wage from their profit.

It's also the part that eats your evenings. If you're spending your nights fighting your software and your weekends pricing tenders, there's another option. Hand the whole thing to someone who prices commercial and civil hydraulic work for a living. That's what SNZ Plumbing Estimating does, every day, for contractors across Australia. You can see the kind of work we price on our case studies page, and if a job's already priced and you just need the numbers checked or a variation assessed, we do that too.

A note on this article. Everything above is based on my own hands-on experience using these tools on real jobs. Software gets updated constantly. Features change, bugs get fixed, new versions ship. What frustrated me in the version I used may well have been improved since. So treat this as one estimator's honest experience, not a current spec sheet, and always check each product's latest capabilities directly with the vendor before you buy. If any of this has changed in a newer release, I'd genuinely like to hear about it.

Last updated: 1 July 2026. Based on the author's personal experience across multiple software versions. Product names are trademarks of their respective owners. This article reflects personal opinion and experience only and is not affiliated with, endorsed by, or sponsored by any software vendor mentioned.