The work
What design-build actually involves
One contract for the drawings and the building
In design and build, a single firm takes the project from sketch to completion. The designer and the builder are the same company, so what gets drawn is what the firm knows how to build and what it costs is known as the design develops.
The alternative is design-bid-build, where an independent architect or designer produces drawings that several contractors price. It takes longer, costs more in fees, and gives you comparable bids.
The strongest argument for design and build is buildability and speed. The strongest argument against it is that nobody independent is checking the price or the specification on your behalf.
Getting the benefit
Without competing bids, the contract has to do the work
A design and build price is not tested against anything, so the protections you would get from competition have to come from the agreement instead.
Open-book pricing, where you see the subcontractor quotes and the contractor's mark-up is a stated percentage, is the usual way to restore some of that visibility.
The other lever is an independent quantity surveyor or owner's representative to review the price and the specification. On a project of any size that fee is small against what it tends to find.
Failure points
Two things that go wrong
Specification thinning as the design develops
“Is the specification schedule fixed, and how are substitutions approved?”
The risk in a single contract is that the price stays the same while the specification quietly gets cheaper, because the same firm controls both. A specification schedule fixed at the point of agreement, with changes requiring your sign-off, is what prevents it.
Who owns the drawings
“If we part company, can I use these drawings with another contractor?”
If the relationship ends, whether you can take the design to another builder depends on what the contract says about intellectual property. Firms differ, and it is much easier to establish at the start than during a dispute.
Before you book design-build
How we rank →Six checks, in the order they save you the most. None of them takes longer than a phone call, and the first one is the reason two quotes for the same job can be a thousand apart.
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Common questions about design-build
Who handles design-build?
Design-build is handled by general contractors. Not every company in the trade takes this work on, so each ranking lists the services a company genuinely performs rather than everything it advertises.
What should I ask before booking design-build?
Ask what the quote includes and excludes, who is doing the work, whether a permit is needed and who is pulling it, and what the workmanship warranty covers. Get the answers in writing before anyone starts.
How do I compare quotes for this?
Put them on one sheet line by line. Differences in price almost always turn out to be differences in scope, material grade or warranty length rather than margin.
Is design-build priced separately from the rest of the job?
Usually it is a line inside a larger quote rather than its own invoice, which is exactly why the exclusions matter. Ask for it itemised so you can compare that line between companies instead of comparing two totals.
For general contracting
Do you offer design-build?
Claim your profile so the services you actually perform are the ones recorded here, alongside your licence, hours and coverage. Neither claiming nor advertising buys a ranked position.