How many jobs a builder can run at once is set by supervision time, not turnover

Ask a room of builders how many jobs they can run at once and most will answer with a number derived from turnover, head count or how many sets of plans are on the desk. Those are the numbers that are easy to see. They are rarely the ones that decide the answer.

The binding constraint on concurrent work is supervision. Every job needs a certain number of hours of your attention at specific moments — inductions, hold points, inspections, sequencing decisions, client conversations and documentation — and those moments do not move to suit your calendar. When the hours run out, the jobs do not slow down. They keep going, unsupervised, and the cost of that shows up later.

This article is about working out your own ceiling honestly, recognising when you have already passed it, and understanding why the recovery cost of over-commitment is almost always larger than the extra turnover that tempted you into it.

Why turnover is the wrong measure of capacity

Turnover tells you what you have sold. It says nothing about what you can deliver. A builder turning over a modest amount across a handful of jobs in the same suburb can be far more over-committed than a builder turning over considerably more on one larger project, because the smaller builder is carrying more sites, more clients, more induction obligations and more separate sequences.

The reason is that supervision load is not proportional to contract value. It is proportional to the number of independent work fronts and the number of decision points each one generates. Two jobs of half the size do not add up to one job of the full size. They add up to considerably more than that, because each carries its own set-up, its own client, its own certifier bookings, its own subbie roster and its own paperwork.

That is why builders who scale by taking on more small jobs often hit a wall that their financials never predicted. The margin on each job looks fine in isolation. The supervision hours required across all of them at once do not exist.

What actually consumes supervision hours

If you want to know your own ceiling, stop estimating it from the P&L and start counting the fixed events on a job that only you can attend or sign off. Most of them fall into a handful of categories.

• Set-up and compliance. Site induction, review of the safe work method statement for any high-risk construction work, erosion and sediment controls, service location, and the initial client walk-through. None of these can be delegated to a subbie who has no authority on the site.
• Hold points. Footings, slab, frame and waterproofing membrane before covering up. These are the moments where a mistake becomes expensive, and where the whole point of supervision is that someone with authority is looking at the actual work.
• Inspection windows. The certifier and any other inspector work to their own schedule. If you miss the window, the job stalls and the trades behind it either down tools or move to another site and do not come back when you need them.
• Sequencing decisions. Who is on site tomorrow, in what order, with what access. On a tight site this is a daily judgement, not a weekly one.
• Client contact. Selection confirmations, variations, progress claims and the questions that arrive the moment a client can see the frame.
• Documentation. Variations, inspection records, photographs, and the evidence you will need if a defect claim is made against you later.

Every one of these scales with the number of jobs, not the value of them. A small renovation and a large new build both need a waterproofing inspection before tiling. The large one might take longer, but the small one still consumes the slot.

High-risk work raises the supervision floor

Some jobs have a minimum supervision requirement that you cannot negotiate down, because the work itself demands it. High-risk construction work requires a safe work method statement, and that document is not a formality to be filed at the office. It has to reflect the actual work, the actual site and the actual controls, and it has to be reviewed and understood before the work starts.

On housing construction, falls are the obvious example. The model code of practice for managing the risk of falls in housing construction exists because the controls on a residential site change constantly: the scaffold goes up, the roof goes on, the edge protection moves, the void gets covered and then uncovered. A safe work method statement that was accurate on Monday can be out of date by Thursday, and the person who can tell the difference is the supervisor standing on the slab.

This is where capacity planning stops being an abstract exercise. A builder running too many jobs cannot be on every site at the moment a control changes. The safe work method statement gets signed and the work proceeds on the assumption that nothing moved. That assumption is what an inspector will test, and it is also what an incident will expose.

If you want a structured refresher on how these obligations sit alongside your other duties as principal contractor, the PointCPD guide to how NSW builder CPD works sets out the framework and how it applies to licensed builders in this state.

The constraint is the number of jobs at the same stage

Here is the part most builders miss. It is not the total number of jobs on the books that determines whether you are over-committed. It is the number of jobs sitting at the same stage at the same time.

Ten jobs spread evenly across set-up, structure, enclosure, fit-out and handover can be manageable. Four jobs all reaching slab within the same fortnight is not, because they all need you at the same hold point in the same week, and there is only one of you. The work fronts collide even though the pipeline looks reasonable on paper.

This is why staggered starts matter more than total volume. A builder who deliberately sequences starts so that no two jobs need the same critical inspection in the same week is effectively buying supervision capacity without hiring anyone. A builder who starts everything at once to satisfy clients who all want to be in by Christmas is borrowing against a week that will arrive, and it will not be a pleasant one.

Signs you have already passed your ceiling

Over-commitment rarely announces itself with a single dramatic failure. It arrives as a series of small omissions that individually look survivable.

You start signing off hold points from photographs sent by a subbie rather than attending the site. Subcontractors begin sequencing themselves because you have not been there to tell them the order. Variations get written up weeks after the work was done, or not at all, and the client’s memory of the conversation differs from yours. The certifier starts finding defects before you do, which is the clearest signal that your quality check has been replaced by someone else’s compliance check.

Client calls stack up during the day and get returned after hours. Site inductions and pre-start checks are done by whoever happens to be on site, which means nobody with authority has actually assessed the conditions. And the thing you used to do as a matter of course — walking a job at the end of the day to look at it with fresh eyes — has quietly stopped happening because there is no time in the week.

None of these are dishonesty. They are all rational responses to having more work fronts than supervision hours. The problem is that each one transfers risk from you to someone who cannot carry it: the subbie, the client, or the next trade in the sequence.

What over-commitment actually costs

The commercial case against taking on too much work is not that you will be tired. It is that the costs arrive after practical completion, when the margin has already been spent and the cash is already committed to the next job.

Defects caused by unsupervised work surface during the defect liability period. Waterproofing failures, poorly installed flashings and inadequate drainage are the classic examples, and depending on the circumstances a waterproofing problem could be classified as a major defect, which changes the timeframe and the cost of dealing with it. By then the subbie may have moved on, the client is frustrated, and the rectification comes straight out of your pocket with no corresponding progress claim.

Then there is the Home Building Compensation Fund. Cover is required for residential work above the threshold, and claims against it follow you. A concentration of defects across multiple jobs in the same period is not just a cash problem; it is a record that affects your ability to obtain cover on reasonable terms. The article on how HBCF claims work is worth reading before you decide that one more job will not hurt.

There is also the cost that never appears in any ledger: the subbies who stop answering your calls. Trades talk to each other. A builder who leaves trades waiting on site because an inspection was missed, or who cannot be reached when a decision is needed, develops a reputation that shows up as longer lead times and higher prices on the next job.

Working out your own number

There is no universal figure for how many jobs a builder can run, because it depends on the type of work, the stage mix, how much of the supervision you can genuinely delegate, and how far apart the sites are. What you can do is measure your own ceiling rather than guessing at it.

Start by tracking your actual supervision hours for a defined period — a fortnight is usually enough to see the pattern. Log every site visit, every inspection, every client conversation over a certain length, every variation written up and every hold point signed off. Do not log office administration; log the things that require you to be present, physically or mentally, in a way that cannot be batched.

Then look at which of those hours were fixed by someone else’s schedule. Inspection windows, certifier bookings and client meetings are effectively immovable. Those are the hours that set your ceiling, because you cannot compress them by working harder.

Finally, divide your available supervision hours by the fixed hours a typical job demands at its peak. The result is not a target; it is a limit. If your pipeline exceeds it, the correct response is to stagger starts, delegate something real, or decline the work — not to assume you will find the time.

A worked example

A builder in western Sydney runs a small residential operation with one supervisor and does most of the client-facing work personally. For a period, the business runs three jobs comfortably: one at frame, one at fit-out and one at handover. The stages are staggered, the inspections do not collide, and the builder is on each site often enough to catch problems before they are covered up.

The market is strong and two more clients sign up. The builder takes both, reasoning that the extra turnover will cover the cost of an additional supervisor if it becomes necessary. What actually happens is that both new jobs start within a fortnight of each other, because both clients want to be in before the end of the financial year.

Within a month, three jobs need slab or frame inspections in the same week. The builder attends two and signs the third off from photographs. The waterproofing on the third job is inspected by the tiler, who is not there to inspect waterproofing. The client on the first job calls during a site visit to the second and is told to send an email, which sits unread for four days.

The defects surface eight months later. The waterproofing failure in the bathroom of the third job requires the floor to come up, and because it is discovered during the defect liability period, the rectification cost lands entirely on the builder. The variation the client wanted on the first job was never written up, so it is absorbed. The additional supervisor was never hired, because the extra turnover went into the rectification instead.

Nothing in that sequence was caused by bad trades or bad luck. It was caused by starting two jobs in the same fortnight when the supervision capacity for one existed and the capacity for two did not.

How to raise the ceiling without taking on more risk

If you want to run more concurrent work, the answer is not to work longer hours. It is to increase the number of supervision hours available without increasing the number of decisions that require you personally.

That means delegating authority, not just tasks. A site supervisor who can sign off a hold point and has the judgement to stop work when something is wrong is worth more than two people who can only report back to you. It also means standardising the things that do not need to be reinvented on every job: induction packs, inspection checklists, variation templates and the sequence of trades for each job type. Every hour you spend building those once is an hour returned on every job afterwards.

It also means being honest about which jobs you should not take. The article on working alone on residential sites covers the practical side of what a single person on site can and cannot manage, and the same logic applies to a single supervisor across multiple sites. And if your growth plan depends on the market continuing to supply work at a particular rate, it is worth understanding how land supply and development in NSW affects the pipeline you are planning against.

Capacity is a discipline, not a number. The builders who survive downturns are usually the ones who declined work at the top of the cycle because they knew what their supervision hours would allow. That decision looks conservative at the time and looks like the best call they ever made about a year later.

Where this fits in your CPD

Capacity planning sits alongside contract administration, insurance obligations and work health and safety as part of what a licensed builder is expected to manage. It is not a separate discipline; it is the reason the others go wrong when it is neglected.

If you are working through your CPD requirements and want courses that deal with these obligations in practical terms rather than as abstract compliance, the PointCPD course catalogue lists what is available for NSW builders. The PointCPD home page has the entry point for the full program.

Questions builders ask

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Published 9 July 2026. General information for builders, not legal, financial or engineering advice for a specific job. Check current requirements with the relevant regulator or standard before relying on them.