Property Developers have to make a LOT of decisions throughout a project. One of the most expensive decisions you'll make in a development project isn't choosing the land, the floorplan or even the finishes. It's deciding how you're going to engage a builder.
Should you complete all of your engineering and documentation before asking builders to quote? Or should you hand the project over under a Design & Construct contract and let the builder take responsibility for the technical detail?
Neither approach is inherently better. Like most things in property development, the right answer depends on the project, your level of experience, your appetite for risk and the builder you're working with.
Understanding the difference before you commit can save you significant money. And just as importantly, a lot of sleepless nights.
What is a Tender Process?
Under a traditional tender process, you engage your own consultants to complete all of the technical documentation before approaching builders.
By the time builders receive the plans, they aren't just looking at architectural drawings or your planning permit. They're pricing from a complete construction package including structural engineering, civil engineering, energy reports, specifications and all the detailed documentation needed to actually build the project.
In other words, everything has already been designed.
The builder's job is simply to work out how much it will cost to construct exactly what has been documented.
Because there are very few unknowns, builders can generally provide extremely competitive pricing. They know precisely what they're quoting on, allowing them to sharpen their pencils and minimise contingencies.
What Does "Design & Construct" Mean?
Design & Construct flips that process around. Rather than completing all of the engineering and technical documentation yourself, you typically provide the builder with the approved development plans, and they take responsibility for producing the construction documentation required to actually build the project. They engage engineers, coordinate consultants and deliver a completed building for an agreed price.
Instead of buying a set of plans and then paying someone to build them, you're effectively buying the finished product.
Why Tendering Usually Produces Lower Prices
From a builder's perspective, pricing a fully documented project is about as comfortable as it gets.
They know exactly what's being built, the engineering has already been completed, the specifications are documented and there are very few unknowns. That certainty allows them to sharpen their pencil because they don't need to include large contingencies for surprises that might emerge later.
When several builders are tendering against the same set of detailed plans, competition generally drives prices down even further. Every builder is quoting exactly the same scope of works, making comparisons relatively straightforward.
On paper, that sounds like the obvious winner.
Unfortunately, someone still has to carry the risk if those detailed plans aren't quite right.
If the engineering turns out to be insufficient, if something has been over-designed, or if an important detail has been missed altogether, those changes generally become variations during construction. Since the builder has priced exactly what was documented, any changes to that documentation usually become the developer's responsibility, and, more often than not, the developer's expense.
That's the trade-off. You may achieve a lower initial construction price, but you also assume more responsibility for the quality and completeness of the documentation.
Why Design & Construct Costs More
One of the biggest misconceptions about Design & Construct is that builders somehow absorb all of the additional risk for free.
They don't.
Builders know they're pricing a project before every engineering detail has been finalised. They understand there are still unknowns, and naturally they'll include an allowance for that uncertainty within their price. The result is that Design & Construct contracts often come in slightly higher than a traditional tender.
However, that additional cost is purchasing something valuable.
You're buying certainty.
If additional engineering is required, or construction details need to be modified as the design develops, those issues generally sit with the builder rather than bouncing back to you as endless variations. Instead of receiving a steady stream of invoices labelled "additional works", you've paid a premium upfront for the builder to manage those risks.
For many developers, particularly those undertaking larger or more complex projects, that's a worthwhile investment. Knowing the builder is responsible for delivering the finished product exactly as contracted can make it much easier to sleep at night.
Not Every Builder Offers Design & Construct
It's also important to understand that Design & Construct isn't simply another contract option that every builder can provide.
Design & Construct requires significant project management and technical expertise. Not every builder has the capability.
Larger commercial builders often employ their own engineers, estimators and design managers to coordinate the documentation internally. Others have long-standing relationships with external consultants they've worked with for years.
These relationships often deliver better pricing than an individual developer could negotiate independently because of the volume of work the builder provides.
This is one reason Design & Construct is particularly common on apartment projects and larger Class 2 developments. The engineering is significantly more complicated, so having an integrated team managing both design and construction often produces a smoother outcome.
For smaller townhouse developments, duplexes or single dwellings, traditional tendering remains much more common.
When Should You Engage the Builder?
One mistake many developers make is waiting until every drawing has been completed before speaking to builders. In reality, many quality builders prefer to become involved much earlier.
Experienced builders often identify expensive design decisions long before construction begins. A slight adjustment to framing, roof design, window placement or structural layout can sometimes save tens of thousands of dollars without affecting the appearance or functionality of the finished project.
Architects are brilliant at designing beautiful buildings. Builders are brilliant at working out how to build them efficiently.
The sweet spot is when those two perspectives work together.
The Design & Construct "Gotcha"
There is one important issue developers should understand before committing to Design & Construct.
Many builders separate the process into two stages:
The builder completes the engineering, consultant coordination and documentation during the design stage.
The problem is that those drawings often belong to the builder, not you.
If you later decide to obtain competing construction prices, you may discover you can't simply take those completed drawings to another builder. In effect, by using the builder's consultants, you've become committed to using that builder for construction as well.
That removes one of the greatest advantages developers normally have - the ability to competitively tender the finished documentation. Without competing quotes, it's difficult to know whether you're receiving the most competitive construction price.
Bottom line, there's nothing inherently wrong with it, provided you understand what you're agreeing to before signing.
Always ask the question early: If we complete the design stage together, am I free to tender these drawings elsewhere?
If the answer is no, that's not necessarily a deal breaker, but it should certainly form part of your decision.
Which Approach Should You Choose?
Yes, I'm going to pull my favourite answer out of the bag: it depends.
Developers with experienced consultant teams who are comfortable managing design risk often achieve lower construction costs by completing the documentation themselves and putting the project out to competitive tender.
Developers who value certainty, prefer a fixed-price outcome and would rather transfer engineering risk to the builder may find Design & Construct delivers better overall value, even if the contract price is a little higher.
Many experienced developers actually combine the best of both worlds. They engage builders early in the design process to benefit from practical construction advice while still retaining enough independence to keep competitive tension in the pricing.
Ultimately, property development isn't simply about finding the cheapest builder. It's about choosing the procurement method that best aligns with your project, your experience and your appetite for risk.
After all, paying a little more upfront can sometimes be far cheaper than discovering halfway through construction that every unexpected issue is now your problem.
Should you complete all of your engineering and documentation before asking builders to quote? Or should you hand the project over under a Design & Construct contract and let the builder take responsibility for the technical detail?
Neither approach is inherently better. Like most things in property development, the right answer depends on the project, your level of experience, your appetite for risk and the builder you're working with.
Understanding the difference before you commit can save you significant money. And just as importantly, a lot of sleepless nights.
What is a Tender Process?
Under a traditional tender process, you engage your own consultants to complete all of the technical documentation before approaching builders.
By the time builders receive the plans, they aren't just looking at architectural drawings or your planning permit. They're pricing from a complete construction package including structural engineering, civil engineering, energy reports, specifications and all the detailed documentation needed to actually build the project.
In other words, everything has already been designed.
The builder's job is simply to work out how much it will cost to construct exactly what has been documented.
Because there are very few unknowns, builders can generally provide extremely competitive pricing. They know precisely what they're quoting on, allowing them to sharpen their pencils and minimise contingencies.
What Does "Design & Construct" Mean?
Design & Construct flips that process around. Rather than completing all of the engineering and technical documentation yourself, you typically provide the builder with the approved development plans, and they take responsibility for producing the construction documentation required to actually build the project. They engage engineers, coordinate consultants and deliver a completed building for an agreed price.
Instead of buying a set of plans and then paying someone to build them, you're effectively buying the finished product.
Why Tendering Usually Produces Lower Prices
From a builder's perspective, pricing a fully documented project is about as comfortable as it gets.
They know exactly what's being built, the engineering has already been completed, the specifications are documented and there are very few unknowns. That certainty allows them to sharpen their pencil because they don't need to include large contingencies for surprises that might emerge later.
When several builders are tendering against the same set of detailed plans, competition generally drives prices down even further. Every builder is quoting exactly the same scope of works, making comparisons relatively straightforward.
On paper, that sounds like the obvious winner.
Unfortunately, someone still has to carry the risk if those detailed plans aren't quite right.
If the engineering turns out to be insufficient, if something has been over-designed, or if an important detail has been missed altogether, those changes generally become variations during construction. Since the builder has priced exactly what was documented, any changes to that documentation usually become the developer's responsibility, and, more often than not, the developer's expense.
That's the trade-off. You may achieve a lower initial construction price, but you also assume more responsibility for the quality and completeness of the documentation.
Why Design & Construct Costs More
One of the biggest misconceptions about Design & Construct is that builders somehow absorb all of the additional risk for free.
They don't.
Builders know they're pricing a project before every engineering detail has been finalised. They understand there are still unknowns, and naturally they'll include an allowance for that uncertainty within their price. The result is that Design & Construct contracts often come in slightly higher than a traditional tender.
However, that additional cost is purchasing something valuable.
You're buying certainty.
If additional engineering is required, or construction details need to be modified as the design develops, those issues generally sit with the builder rather than bouncing back to you as endless variations. Instead of receiving a steady stream of invoices labelled "additional works", you've paid a premium upfront for the builder to manage those risks.
For many developers, particularly those undertaking larger or more complex projects, that's a worthwhile investment. Knowing the builder is responsible for delivering the finished product exactly as contracted can make it much easier to sleep at night.
Not Every Builder Offers Design & Construct
It's also important to understand that Design & Construct isn't simply another contract option that every builder can provide.
Design & Construct requires significant project management and technical expertise. Not every builder has the capability.
Larger commercial builders often employ their own engineers, estimators and design managers to coordinate the documentation internally. Others have long-standing relationships with external consultants they've worked with for years.
These relationships often deliver better pricing than an individual developer could negotiate independently because of the volume of work the builder provides.
This is one reason Design & Construct is particularly common on apartment projects and larger Class 2 developments. The engineering is significantly more complicated, so having an integrated team managing both design and construction often produces a smoother outcome.
For smaller townhouse developments, duplexes or single dwellings, traditional tendering remains much more common.
When Should You Engage the Builder?
One mistake many developers make is waiting until every drawing has been completed before speaking to builders. In reality, many quality builders prefer to become involved much earlier.
Experienced builders often identify expensive design decisions long before construction begins. A slight adjustment to framing, roof design, window placement or structural layout can sometimes save tens of thousands of dollars without affecting the appearance or functionality of the finished project.
Architects are brilliant at designing beautiful buildings. Builders are brilliant at working out how to build them efficiently.
The sweet spot is when those two perspectives work together.
The Design & Construct "Gotcha"
There is one important issue developers should understand before committing to Design & Construct.
Many builders separate the process into two stages:
- Design Phase
- Construction Phase
The builder completes the engineering, consultant coordination and documentation during the design stage.
The problem is that those drawings often belong to the builder, not you.
If you later decide to obtain competing construction prices, you may discover you can't simply take those completed drawings to another builder. In effect, by using the builder's consultants, you've become committed to using that builder for construction as well.
That removes one of the greatest advantages developers normally have - the ability to competitively tender the finished documentation. Without competing quotes, it's difficult to know whether you're receiving the most competitive construction price.
Bottom line, there's nothing inherently wrong with it, provided you understand what you're agreeing to before signing.
Always ask the question early: If we complete the design stage together, am I free to tender these drawings elsewhere?
If the answer is no, that's not necessarily a deal breaker, but it should certainly form part of your decision.
Which Approach Should You Choose?
Yes, I'm going to pull my favourite answer out of the bag: it depends.
Developers with experienced consultant teams who are comfortable managing design risk often achieve lower construction costs by completing the documentation themselves and putting the project out to competitive tender.
Developers who value certainty, prefer a fixed-price outcome and would rather transfer engineering risk to the builder may find Design & Construct delivers better overall value, even if the contract price is a little higher.
Many experienced developers actually combine the best of both worlds. They engage builders early in the design process to benefit from practical construction advice while still retaining enough independence to keep competitive tension in the pricing.
Ultimately, property development isn't simply about finding the cheapest builder. It's about choosing the procurement method that best aligns with your project, your experience and your appetite for risk.
After all, paying a little more upfront can sometimes be far cheaper than discovering halfway through construction that every unexpected issue is now your problem.
