Planning Approval vs Building Permit Drawings: Why One Set of Plans Is Not Always Enough

 

residential drafting in Perth - Domestic Drafting Service

Planning approval drawings and building permit drawings serve different purposes. One helps the relevant authority assess whether a proposed development is acceptable from a planning perspective. The other provides the technical information needed to assess and carry out the building work. For projects that require both approvals, relying on one drawing set without allowing for the next stage can create gaps, revisions and unnecessary delays.

What Planning Approval Drawings Need to Show

Planning drawings focus on how a proposal fits its site and surrounding area.

Depending on the project, they may show:

• Site boundaries and setbacks
• Building height and overall form
• Floor layouts and elevations
• Vehicle access and parking
• Neighbouring properties
• Landscaping or open space
• The proposed use of the building.

For work involving residential drafting in Perth, the drawings may also need to respond to relevant R-Code provisions and local planning controls.

Planning assessment is largely concerned with whether the proposal can be supported in its proposed form and location.

Building Permit Drawings Go Further into Construction

Once a project reaches the building permit stage, the focus changes.

A building permit generally deals with compliance with building standards and the technical details needed for construction. The City of Perth notes that a building permit is generally required for construction, renovation, alteration or improvement work, particularly where structural integrity, occupant safety or building-standard compliance may be affected.

Typical building drawings may include:

Drawing or Detail	Main Purpose
Floor plans	Dimensions, room layouts and construction information
Elevations	External materials, heights and openings
Sections	Floor, wall, ceiling and roof relationships
Structural details	Beams, footings and other engineered elements
Specifications	Materials and construction requirements

A planning set may not contain all of this information.

Why the Two Drawing Sets Must Still Match

Although the level of detail changes, the approved design cannot simply be altered during the building permit stage without considering the planning approval.

The City of Perth states that where development approval is required, it should be obtained before the building application is submitted, and the building drawings need to match the approved development.

That can become an issue when technical work exposes a design problem.

For example, structural engineering might require a larger beam, thicker wall or revised roof arrangement. In commercial drafting in Perth, services, accessibility requirements or fire-related design considerations can also affect internal layouts.

Some changes are minor. Others may require the planning drawings to be reviewed or amended before the building documentation can proceed.

Planning Information Is Not Construction Information

A common mistake is assuming that an approved floor plan gives a builder everything needed on site.

It usually does not.

Dimensions may need further development, structural elements have to be coordinated, and construction details must be resolved. Wet areas, roof junctions, levels and openings often need more information than was necessary for planning assessment.

This is also where a residential draftsman in Perth may need to coordinate drawings with engineers, surveyors or other consultants.

And that coordination matters because one small technical change can affect several sheets.

Keep Both Stages Connected

Planning and building approvals should be treated as connected stages rather than unrelated paperwork. Development drawings establish the approved design, while building permit drawings develop that design into documentation suitable for regulatory assessment and construction.

Before moving from one stage to the next, check that the dimensions, elevations, setbacks and major design elements remain consistent. That simple review can prevent a technically correct building set from drifting away from what was actually approved.