If you already have an architect and a set of plans and just want a builder to price and deliver the build, the accuracy of that price depends entirely on what you’re able to hand over up front. A quote based on incomplete information isn’t really a quote — it’s a placeholder that will move once the gaps are filled in.
What to Have Ready
- A complete, consented (or consent-ready) set of architectural drawings — not concept sketches
- Structural engineering drawings and specifications where required
- A specifications document covering fixtures, finishes, and fittings — not just “standard” or “to be confirmed”
- Confirmation of any site-specific conditions (slope, ground conditions, existing services) already known
- Any council or geotech reports already completed for the site
Why “To Be Confirmed” Items Undermine a Quote
Every specification left as “TBC” is a decision that gets made later, usually at a higher cost than if it had been locked in before pricing. A build-only quote is only as accurate as the drawings and specifications behind it — gaps don’t disappear, they just get resolved as variations once construction has already started.
What Happens If Plans Are Still at Concept Stage
A builder can still provide a budget estimate from concept-level plans, but it should be understood as a range, not a fixed price — the final figure will move as drawings are finalised and specifications are locked in. This isn’t a limitation of the builder; it reflects how much of the actual cost is determined by decisions that haven’t been made yet.
Why This Matters for a Build-Only Relationship Specifically
In a design-and-build arrangement, a builder is part of the process that resolves these gaps as they arise. In a build-only arrangement, that resolution has to happen before the builder is engaged — which is exactly why the quality of what you hand over at the pricing stage matters more in a build-only scenario than in any other procurement path.
Frequently Asked Questions
What information does a builder need before pricing a project?
At minimum: complete architectural drawings, structural specifications where relevant, a fixtures and finishes specification, and any known site-specific conditions. Concept-stage plans alone can only support a budget range, not a fixed price.
Can a builder quote from concept drawings?
Yes, but only as a budget estimate rather than a fixed price — the final number depends on decisions and specifications that aren’t yet locked in at concept stage.
Why did my build-only quote change after construction started?
This usually traces back to specifications that were left unconfirmed at pricing stage — every “TBC” item becomes a decision made later, typically at a different cost than if it had been resolved upfront.
Have plans ready and want an accurate build-only price? Get in touch with our team, or read more about our build-only service.