What the control sets
Clause 4.4 provides that the maximum floor space ratio for a building on any land is not to exceed the ratio shown for the land on the Floor Space Ratio Map. Floor space ratio is defined as the ratio of the gross floor area of all buildings within the site to the site area.
Like the height map, it is a development standard set in the LEP and mapped per parcel, and it is set independently of the height. Nothing requires the two to be consistent with each other, and on a great many sites they are not — which is the subject of the fourth section below.
Gross floor area is not the floor area of the building
The Dictionary measures gross floor area as the sum of the floor area of each floor, taken from the internal face of external walls (or from the internal face of a wall separating the building from another building) at a height of 1.4 m above the floor. It expressly includes the area of a mezzanine and habitable rooms in a basement or an attic, and then excludes a list of things:
- Common vertical circulation — lifts and stairs.
- In a basement: storage, vehicular access, loading areas, garbage and services.
- Plant rooms, lift towers and other areas used exclusively for mechanical services or ducting.
- Car parking required by the consent authority (not parking provided beyond that), and the access to it.
- Space used for loading or unloading goods, and the access to it.
- Terraces and balconies with outer walls less than 1.4 m high.
- Voids above a floor at the level of a storey or storey above.
Lift and stair cores, plant, the loading dock and basement storage and services are a large share of a building’s built volume, and none of it counts. Car parking is excluded only to the extent it is required by the consent authority (and its access), so parking provided above that requirement, and any habitable room in a basement or attic, does count. A site with a 2:1 floor space ratio does not yield a building with twice the site area of floor plate — it yields twice the site area of countable floor plate, plus everything excluded. Sizing a scheme from the ratio alone understates the built volume, and sizing construction cost from the same number understates that too, in the other direction.
The balcony rule is the one that most often surprises. A balcony with outer walls below 1.4 m is excluded; enclose it, or raise the wall, and it can begin to count. That is a design decision with a direct yield consequence, made late in documentation on plenty of projects.
Described from the Standard Instrument Dictionary definition of gross floor area. Some LEPs add their own inclusions or exclusions, and clause 4.5 sets out how floor space ratio and site area are calculated for particular cases — read both as made in the LEP applying to the land.
Site area is also a defined term
The denominator is not simply “the land you own”. Clause 4.5 governs how site area is calculated, and it deals with the cases that would otherwise let the same land do double duty — land already used to justify floor space in an earlier consent, land in different zones, and land that is not part of the development site in any real sense.
The practical version: land that has already been counted once cannot be counted again, and a staged development has to keep its site-area accounting straight across the stages. On an amalgamation this is worth checking before the ratio is applied, not after.
When the height map and the floor space ratio disagree
Both standards apply, so the binding one is whichever runs out first. Two common shapes:
Floor space binds. The mapped height would allow another level, but the ratio is already spent. The extra height is worth nothing unless it buys something other than floor area — better ceiling heights, a roof terrace, a plant zone that frees a level below.
Height binds. The ratio would allow more floor area than fits under the cap at a reasonable footprint. Here the constraint is geometric, and the answer is usually site coverage: a bigger plate, or a different typology, rather than more storeys.
Working out which of the two binds is the first calculation on a NSW site, and it is worth doing before anything is drawn. Search a real address on the home page to see the zone and controls recorded against it.
Exceeding the mapped ratio
Clause 4.6 again: the applicant demonstrates the two limbs in clause 4.6(3) and the consent authority must be satisfied and keep a record (the public-interest test and Secretary concurrence were removed on 1 November 2023). The first question is whether the mechanism is available on this standard at all: clause 4.6(8) excludes complying development standards, BASIX commitments, clause 5.4 and clause 5.5, and an LEP can add exclusions. A floor space ratio variation tends to draw closer scrutiny than a height variation of comparable size, because it goes to the quantum of development rather than to its form — the objectives it has to be consistent with are usually about density and the capacity of the area to absorb it.
Some SEPPs also supply their own floor space standards or bonuses that sit over the mapped ratio — in-fill affordable housing and the housing SEPPs are the usual examples. Those are not clause 4.6 variations; they are separate entitlements with their own conditions, and they are read before a variation is contemplated.
Sources
- Standard Instrument — Principal Local Environmental Plan, clause 4.4 Floor space ratio and clause 4.5 Calculation of floor space ratio and site area
- Standard Instrument Dictionary — “floor space ratio”, “gross floor area” and “site area”
- Standard Instrument — Principal Local Environmental Plan, clause 4.6 Exceptions to development standards, as revised 1 November 2023
- NSW Department of Planning and Environment, Guide to Varying Development Standards (November 2023), sections 2.1 and 6.4
Related: height of buildings is the other half of the pair, and minimum lot size decides how many lots the site can become in the first place.
Check it on a real site
See what applies to a particular property
This page describes the control in general. To see what applies to a particular property, search its address and read the zone, overlays and controls recorded against it. No account is needed for the search.
This page describes the instrument, not your land. Which controls actually apply to a particular property is settled by the planning certificate for it — a section 10.7 certificate in New South Wales, a planning certificate in Victoria — and by the responsible authority.