BLDG7021 Chap.2 Planning Controls and Site Strategy
Planning Controls and Site Strategy
Planning controls become useful when they are translated into dimensions, areas, routes and option criteria.
This chapter builds a constraint register for height, setbacks, public space, deep planting, parking and access, then shows how to compare site strategies without confusing a statutory requirement, a project target and a design preference.
For consolidation, alter one control in the register and trace its effects through the site plan, controlling section, area schedule and option matrix.
Mark every place where the old value would survive if only the first drawing changed. Then write a precise request for the relevant planning advice, including the proposed geometry and the decision that depends on the answer. This exercise tests change control and shows why source status, dimensions and design consequences must remain linked throughout development.
What this chapter covers
- 01
Build a constraint register
- 02
Separate controls from targets
- 03
Calculate planning ratios
- 04
Draw access and servicing paths
- 05
Compare equivalent site options
Worked example · free
Translate a parking rate
- 1Use the applicable GFA as the area base.
- 1Divide 12,600 by 300 to obtain 42 spaces.
- 1Test geometry, accessible spaces, ramps, servicing and pedestrian separation.
Key terms
- Constraint register
- A table connecting each planning requirement to its source, spatial consequence and evidence.
- Deep planting
- Consolidated landscape area capable of supporting substantial planting under the applicable control.
- Planning ratio
- A rate that converts an applicable area or use into a capacity or provision.
Planning Controls and Site Strategy FAQ
How should planning controls appear in the submission?
Show the source and requirement in a summary, then dimension or quantify its consequence on the relevant plan, section, area schedule or movement diagram for direct review.
What if two planning rates seem applicable?
State both interpretations, identify the classification or boundary that decides applicability, carry a conservative allowance and seek authoritative confirmation rather than choosing the convenient result.
How do I compare site options fairly?
Use identical scales, base information and criteria for compliance, public space, planting, access, servicing, floor area and neighbour effects before recommending one explicitly evidenced trade-off.
What should happen when a control changes?
Update the register, search for the superseded value, revise every dependent drawing and calculation, and record the source and consequence of the new interpretation across the complete set.
Assessment move
Study planning controls as spatial inputs rather than a list to memorise. Start a constraint register with the source, clause or project instruction, the relevant value, its interpretation, the drawing where it is tested and its current status. Separate statutory requirements from assumed project targets and voluntary design preferences.
If the source is uncertain, label it provisional and assign a verification action; do not let an unverified number acquire the appearance of fact through repetition across drawings. Redraw the site with a consistent base and translate every written control into visible geometry. Heights need a nominated datum and a section. Setbacks need dimensioned plan edges. Deep planting needs a measured area and credible soil zone.
Vehicle, pedestrian and service access need continuous paths with turning or clearance implications. Parking or bicycle rates need arithmetic followed by an actual layout. The last step matters because a correct count may still fail once aisles, ramps, columns and accessible spaces occupy the site. Practise the same calculation with changed assumptions.
Increase the relevant floor area, change an occupancy category or test a more conservative rate, then note which design move absorbs the difference. Sensitivity checks reveal whether the strategy has useful capacity or depends on one fragile assumption. Keep units visible throughout, write the formula in words before substituting numbers and state the rounding rule.
A reviewer should be able to reproduce the result and find the corresponding geometry without guessing. Compare at least two site strategies with identical criteria. Useful headings include compliance risk, public realm quality, access conflict, development yield, daylight opportunity, servicing, landscape continuity and capacity for later change. Do not score an option highly merely because it draws cleanly.
Note the trade-off explicitly: a larger setback may improve public space but compress loading or floorplate depth; a different entry may improve address but complicate vehicle separation. The comparison becomes evidence for a decision, not decoration after it. Run a change audit whenever a control or interpretation changes. Search the model, calculations, schedules, annotations and diagrams for the old value.
Update dependent areas or counts and record why the revision occurred. Preserve the source reference so the current assumption can be distinguished from an earlier sketch. Where a control requires specialist advice, formulate a precise question that includes the proposed geometry and the uncertainty to be resolved. This makes consultant input more useful than a broad request to check compliance.
For revision, choose one fictional control set and prepare a one-page planning evidence sheet containing the register, a dimensioned plan, one controlling section, a small calculation and a comparison note. Hand it to a peer and ask them to identify the binding control, the main design consequence and the largest unresolved risk. If they cannot, improve hierarchy and captions.
End by writing a short decision statement that distinguishes what is confirmed, what is an AskSia practice assumption and what still needs authoritative verification.