What Drawings Are Needed for CDC Approval?

If you are asking what drawings are needed for CDC approval, you are usually at the point where rough ideas need to become formal documentation. That is where many projects either move forward smoothly or get delayed by missing information, inconsistent plans, or details that do not line up with NSW compliance requirements.

A Complying Development Certificate is designed to be a faster approval pathway than a full DA, but it is not a shortcut around proper documentation. The certifier still needs enough detail to confirm the proposal meets the planning controls, the Building Code of Australia, and relevant standards. In practice, that means your drawings need to be clear, coordinated, and prepared with the approval pathway in mind.

What drawings are needed for CDC applications?

The exact drawing set depends on the type of project. A new home, granny flat, duplex, alteration, fitout, deck, or garage will not all require the same level of information. Even so, most CDC applications in NSW rely on a core group of plans that establish what is being built, where it sits on the site, and how it complies.

For most residential projects, the standard drawing package will include a site plan, floor plans, elevations, sections, and a roof plan. These are the foundation documents. They show the building footprint, setbacks, room layout, overall height, roof form, levels, openings, and relationship to the site boundaries.

The site plan is one of the most important documents in the set. It needs to show the lot boundaries, north point, existing structures, proposed works, distances to boundaries, private open space, landscaped areas, driveways, stormwater concepts, easements, and any other site constraints that affect compliance. If the proposal involves demolition or additions, that should also be made clear.

Floor plans need to do more than show room names. They should include dimensions, wall locations, door and window positions, floor levels, and the use of each space. If the project includes wet areas, kitchens, laundries, or commercial fitout components, those spaces often need more detailed notation because they can trigger specific compliance issues.

Elevations show the external appearance of the building from each side. They help the certifier assess height, external materials, window placement, privacy issues, and the overall built form. Sections then cut through the building to show internal heights, roof pitch, ground relationship, and construction depth where needed.

Why CDC drawings need more than basic drafting

A common misunderstanding is that any set of plans will do as long as they look tidy. For CDC, presentation matters, but accuracy matters more. The drawings need to tell a consistent compliance story.

If your site plan shows one setback, your floor plan suggests another, and your elevations indicate a different wall height, the certifier will not treat that as a minor drafting issue. It becomes a risk item. The same applies when roof drainage is not resolved, natural ground levels are unclear, or private open space calculations do not match the plans.

This is why CDC documentation works best when the design has been developed by someone who understands both building design and the approval framework. It is not just about drawing what you want to build. It is about drawing it in a way that can be properly assessed.

The supporting drawings often needed for a CDC

Beyond the basic set, many projects need additional drawings or technical detail to satisfy the certifier. This is where the answer to what drawings are needed for CDC becomes more project-specific.

A demolition plan may be required where existing structures or portions of a building are being removed. This should identify exactly what is to remain and what is to go, especially for renovations and additions.

A shadow diagram is often needed for residential work, particularly where setbacks, solar access, and neighbouring amenity need to be demonstrated. For dual occupancies and townhouse-style proposals, this becomes even more important.

For sloping sites, existing and proposed levels may need to be shown in greater detail. You may also require earthworks information, retaining wall locations, finished surface levels, and drainage direction. On flatter sites this can be simpler, but it should never be guessed.

Window and door schedules, BASIX-related information, and construction details can also form part of the submission set. If the project includes a deck, balcony, privacy screen, garage, or studio, the design may need details that address balustrades, overlooking, roofwater disposal, and separation from boundaries.

For some commercial and mixed-use proposals that qualify under complying development, additional fitout plans may be needed. These can include reflected ceiling plans, seating layouts, accessibility details, sanitary layouts, and fire safety-related notes, depending on the use and extent of work.

Reports and documents that work with the drawings

Although the question is about drawings, a CDC application is rarely approved on drawings alone. The plans are usually assessed alongside site-specific reports and supporting documentation.

In NSW, BASIX is commonly required for residential development. A CDC submission may also need structural engineering, stormwater design, a drainage concept, a waste management approach, a specifications document, and in some cases a geotechnical or bushfire report. If the land is flood affected, bushfire prone, heritage constrained, or subject to sewer or drainage easements, extra documentation may be necessary.

This is where owners can get caught out. They may have a decent set of architectural drawings, but not the supporting material needed to complete the application. The result is more back-and-forth, more consultant coordination, and more time lost before approval can be issued.

What drawings are needed for CDC on different project types?

For a granny flat, the certifier will typically expect a full site plan, floor plan, elevations, sections, roof plan, and enough information to confirm setbacks, site coverage, landscaped area, private open space, and drainage. Because these projects are often built on sites with existing homes, the relationship between both dwellings needs to be shown clearly.

For renovations and additions, the drawing set usually needs to distinguish existing and proposed works. Existing plans, demolition plans, and proposed plans are commonly required together. If the addition affects setbacks, overshadowing, or building height, those impacts need to be documented properly.

For a new house or duplex, the documentation is generally broader. Height, articulation, private open space, parking, site coverage, landscaping, and building envelope controls all need to be addressed. On more constrained lots, the drawings may need to be backed by a stronger compliance review before submission.

For decks, garages, and smaller outbuildings, people often assume the drawing requirements will be minimal. Sometimes they are simpler, but not always. Boundary setbacks, stormwater disposal, floor levels, roof height, and structural detail still matter. A small project can still be refused under CDC if the documentation is incomplete or the design falls outside the code.

Common mistakes that delay CDC approval

The biggest issue is not usually the absence of one magic drawing. It is a collection of smaller problems that suggest the design has not been properly resolved.

Plans with missing dimensions are a regular issue. So are inconsistent levels between plans and elevations, unclear boundary setbacks, and site plans that do not accurately show existing conditions. Another frequent problem is lodging plans before checking whether the proposal actually qualifies as complying development under the relevant code.

There is also the temptation to use an old drawing set and make quick amendments. That can work for very simple changes, but on many projects it creates more problems than it solves. Once one part of a design changes, several other drawings usually need to be updated too.

With CDC, speed comes from getting the documentation right early. It does not come from rushing out a half-complete plan set and hoping the gaps can be sorted later.

The practical way to prepare a CDC drawing set

The best approach is to start with a proper site review, confirm whether CDC is a suitable pathway, and then prepare drawings specifically for that pathway. That sounds obvious, but it is often overlooked. A design developed for a DA process is not always ready for CDC without revision.

Measured information should be reliable, especially for additions and alterations. Site constraints should be identified upfront. Then the plans should be coordinated with BASIX, engineering, and any other required consultants before submission.

This is where experience makes a noticeable difference. A firm that regularly prepares approval documentation can usually identify the likely sticking points before they become formal requests for more information. For clients in Sydney, the Central Coast and Newcastle, that local knowledge is often just as valuable as the drafting itself.

At GAP Designers, this is why CDC work is approached as both a design task and an approvals task. The drawings need to communicate the project clearly, but they also need to stand up to assessment.

If you are preparing for a CDC, think beyond whether you have plans at all. The better question is whether you have the right plans, with the right level of detail, for your site and your type of project. That is usually what gets an approval moving in the right direction.