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Novation of design consultants to the builder

Novated design: the architect or engineer engaged by the client gets reassigned to the builder at contract execution. Design freeze, change control, PI implications.

By Dan Waring. Last updated 15 May 2026. Verified 15 May 2026.

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TL;DR

Novation of design is the procurement step in a D&C contract where the architect or engineer originally engaged by the client is reassigned to the builder at contract execution, so all design liability and design-coordination obligations flow through to the builder from that day. It is the building block of “design-assist” and is the standard procurement model on apartment, mixed-use and bigger custom-residential projects. Three commercial consequences for the builder: (a) the design is frozen at novation date, so post-novation client changes become contractor variations and get charged; (b) the builder’s professional indemnity insurance must respond to the novated consultant’s design liability, not just the builder’s own construction work; (c) the novation deed will commonly contain a fitness-for-purpose flow-down clause that pushes any fitness obligations from the head contract back onto the consultant; consultants resist this and the negotiation typically lands somewhere between fit-for-purpose and reasonable-skill-and-care.

What novation is

A novation, in contract law, is the substitution of one party for another in an existing contract. The original contract does not get torn up: instead, the obligations under it pass to the new party, and the original party drops out. In construction, the most common novation pattern is the client-to-builder consultant novation at D&C execution:

  1. Client commissions an architect (and engineer, services consultants, etc.) for early design (“design development stage”, typically up to about 60-80% complete).
  2. Client puts the project to tender on a D&C basis with the partial design as the technical brief.
  3. The successful builder enters the head construction contract with the client. At the same time the consultant signs a novation deed, transferring their consulting contract from the client to the builder.
  4. From the day of novation, the architect and engineer work for the builder. The client communicates design preferences through the builder, not directly.

The consultant’s contract terms (scope of services, fee schedule, design responsibilities, professional indemnity obligation) carry over to the builder unchanged unless the novation deed amends them. The novation deed is the document the builder’s solicitor must read on D&C jobs.

Where novation matters in residential

Novation is rare on Class 1a single-dwelling jobs because most of those are construct-only or volume D&C with the builder’s own in-house design. It becomes common on:

  • Custom residential where the architect was engaged before the builder was selected (often “Architects’ Tender” runs by ABIC contract pathways).
  • Class 2 apartments and Class 3 / 9c projects where the design lead time runs to 18-36 months and the builder is engaged mid-design.
  • Heritage-overlay or BAL-FZ jobs where the architect’s specific local-council expertise was the reason for early engagement, and the client wants that expertise transferred rather than re-procured.

On a job under the NSW Design and Building Practitioners Act 2020, the novated consultants must remain registered design practitioners and the compliance declarations must continue across the novation. A novation that breaks the design-practitioner registration chain breaks the OC pathway.

Common gotchas

  • Design freeze at novation date. Anything the client wanted “considered” before novation but not specifically agreed becomes the builder’s call after novation. Builders should walk the client through the design at novation and confirm every open item in writing. Anything raised later is a variation, priced and time-extended.
  • Fitness-for-purpose flow-down. Head contract typically requires builder to deliver a building “fit for the intended purpose”. This is a higher standard than the consultant’s usual “reasonable skill and care” liability. Negotiating the novation deed to flow that fitness obligation back to the consultant is the single biggest commercial fight on novation. Consultants commonly accept it only with a fee uplift and a higher PI limit; some refuse outright. Where the consultant refuses, the builder carries the gap and prices it.
  • Consultant PI continuity. The novated consultant’s professional indemnity policy must continue to cover the work into and post novation. Check the policy is in force, the limit is appropriate, and the retroactive date predates the consultant’s first work on the project. Run-off cover applies if the consultant later winds down their book.
  • Pre-novation design defects are still pursued through the consultant. The consultant is liable for design errors made during the pre-novation period under the original client-consultant contract. The novation transfers forward obligations, not historic defects. Where a defect is found post-completion, the path is via the builder’s head-contract warranty and then back through the novated consultant.
  • Client circumvention. The client sometimes continues talking design directly to the architect after novation. Document this in the novation deed: all design communication post-novation goes through the builder. Side conversations create scope creep and variation disputes.

References

See also

Last updated: 2026-05-15. Verified: 2026-05-15. Quarterly review for currency.

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