Can I change my design after DA approval in NSW?

How does a section 4.55 modification work?

A development consent approves a particular set of plans and conditions, so any change to either has to go back through the consent authority, usually your council. The NSW Department of Planning's DA guide says you can apply for a modification of consent under section 4.55 if you want to change the approved plans or the conditions. That includes simply changing your mind about part of the design.

Beyond corrections and changes with no environmental impact, the test that matters is whether the modified home stays substantially the same as the one originally approved. The guide says a change which varies too much from the consent needs a new DA. Modifications were called section 96 applications until March 2018, as the City of Sydney notes, so older advice may still use that name.

What are the three types of 4.55 modification?

The Department's March 2026 practice note on section 4.55 sets out three pathways, each matched to the size and impact of the change.

• Section 4.55(1) covers minor errors, misdescriptions and miscalculations, along with changes that have no environmental impact. The council has 14 days from lodgement to decide these applications.
• Section 4.55(1A) covers changes with minimal environmental impact, where the development stays substantially the same.
• Section 4.55(2) covers other changes, such as design changes, where you show the development will remain substantially the same.

A consent granted by the Land and Environment Court follows its own route. The consent authority can modify it under section 4.56 and the Court can modify its own consent under section 4.55(8). The City of Sydney accepts modification applications only through the NSW Planning Portal, not by email, post or in person.

What does council need to assess the change?

The City of Sydney's document requirements ask for a description of the modification and a list of the affected drawings with their numbers and dates. Updated drawings must show the proposed changes clearly. You also state whether the change corrects an error or does something more, describe its expected impacts and confirm that the modified development remains substantially the same.

The Department's guide warns that modifications can take time and cost additional fees. It adds that getting the intended outcome right in the original DA is much easier than changing it afterwards.

What if the change is only in the construction drawings?

Detail grows after consent, while the design itself is not meant to move. Service NSW notes that any changes to the construction plans need to be assessed and may require an application to modify the consent. A certifier can only issue a construction certificate for plans that are consistent with the development consent.

Conditions of consent can change the design as well. The NSW Government's post consent guide gives examples such as a reduced height, a deleted element, a privacy screen or a retaining wall. If a condition is unacceptable rather than a change you want, the DA guide describes a review of determination by council or an appeal to the Land and Environment Court. Since 21 March 2026 you generally have six months to lodge a review with no deadline for deciding it, as the Department's information sheet on the reforms explains. The usual six month appeal period pauses while a review is underway, so you can still appeal once it ends.

How we keep changes ahead of the DA

At SHORE Design + Build we coordinate the structural, hydraulic and other consultants during design development and settle the materials, openings and ceiling heights before we lodge. By the end of that stage the house is resolved inside and out, so the application council approves is the home we go on to document and build.

Changes still come up once a home is approved. Because our builders price the design as it develops, the cost of a proposed change is on the table in the same conversation as the design itself. You can see where each decision sits in how we design and build a home or explore design and build in Sydney with us.