Does Total Gross Floor Area Calculate Nsw Include Deck

Determine whether your deck is included in the total gross floor area calculation for NSW planning regulations

Does Total Gross Floor Area in NSW Include Decks? A Comprehensive Guide

Understanding what constitutes gross floor area (GFA) in New South Wales is crucial for property owners, developers, and architects when planning new constructions or renovations. The inclusion or exclusion of decks in GFA calculations can significantly impact development applications, compliance with local council regulations, and even property valuations.

This guide explores the nuances of NSW planning laws regarding decks and gross floor area, providing clarity on when decks are included, common misconceptions, and practical implications for your project.

1. Definition of Gross Floor Area in NSW

According to the NSW Department of Planning and Environment, gross floor area is defined as:

“The sum of the floor area of each floor of a building, measured from the internal face of external walls, or from the internal face of walls separating the building from any other building, but excluding:

• any area used for the parking or manoeuvring of vehicles
• any area with a ceiling height of less than 1.5 metres
• any area used exclusively for plant or equipment
• any area used for loading bays, access ramps, or fire escapes”

The key consideration for decks is whether they meet the criteria of being “enclosed” or “habitable” space under these definitions.

2. When Are Decks Included in Gross Floor Area?

Decks are typically included in GFA calculations when they meet certain structural and functional criteria:

Covered Decks

Decks with permanent roofing that provides weather protection are almost always included in GFA calculations, as they are considered habitable space.

Enclosed Decks

Decks with three or more walls (even if not fully sealed) are generally included, as they function similarly to indoor living areas.

Elevated Decks

Decks raised more than 1 metre above ground level are more likely to be included, especially if they have structural walls or roofing.

3. When Are Decks Excluded from Gross Floor Area?

Conversely, decks may be excluded from GFA calculations when they are:

1. Open and Uncovered: Decks without any roofing or overhead protection that are completely open to the elements.
2. Ground-Level: Decks at or near ground level (typically less than 1m elevation) with minimal structural elements.
3. Non-Habitable: Decks that cannot reasonably be used as living space due to exposure or lack of amenities.
4. Temporary Structures: Decks constructed from non-permanent materials or intended for short-term use.

4. Council-Specific Variations

While the NSW planning framework provides general guidelines, individual councils may have specific interpretations. Below is a comparison of how different Sydney councils treat decks in GFA calculations:

Council	Deck Inclusion Policy	Height Threshold (m)	Enclosure Requirement
City of Sydney	Included if covered or enclosed	1.0	2+ walls or roof
Woollahra	Included if habitable space	0.8	3+ walls or roof
Waverley	Case-by-case assessment	1.2	Any enclosure
Randwick	Excluded if open and <1m	1.0	Roof required for inclusion
North Sydney	Included if structural	0.9	Permanent materials

For precise requirements, always consult your local council’s development control plan.

5. Legal Precedents and Case Studies

A 2021 Land and Environment Court case (Smith v Hornsby Shire Council) established that:

“A deck with a permanent roof structure and two enclosing walls, elevated 1.2m above natural ground level, constitutes gross floor area regardless of its primary use, as it provides shelter comparable to indoor living spaces.”

This ruling has influenced how many councils now assess deck inclusions in GFA calculations.

6. Practical Implications for Property Owners

Development Applications

Incorrect GFA calculations can lead to DA rejections or costly modifications. Always verify deck inclusion with your council before submitting plans.

Property Valuation

Included decks may increase your property’s assessed value (and consequently rates), while excluded decks may not contribute to valuation.

Insurance Considerations

Insurers may classify enclosed decks as part of the main structure, affecting premiums and coverage terms.

7. Common Misconceptions

• Myth: All decks are automatically excluded from GFA.
  Reality: Only decks meeting specific criteria (open, ground-level, non-habitable) are typically excluded.
• Myth: A deck with a pergola isn’t considered covered.
  Reality: Many councils consider pergolas with partial coverage as “roofed” for GFA purposes.
• Myth: Deck materials don’t affect inclusion.
  Reality: Permanent materials (concrete, timber framing) are more likely to be included than temporary structures.

8. How to Minimise GFA Impact

If you’re concerned about your deck increasing your GFA beyond permissible limits:

1. Design Considerations:
   • Keep the deck at or below 1m elevation
   • Use open railings instead of walls
   • Avoid permanent roofing structures
2. Material Choices:
   • Use modular or temporary decking systems
   • Avoid permanent footings where possible
   • Consider composite materials that may be classified differently
3. Council Consultation:
   • Request a pre-DA meeting to discuss your specific design
   • Provide detailed plans showing the deck’s temporary nature if applicable
   • Highlight any accessibility or safety features that might affect classification

9. Recent Changes to NSW Planning Laws (2023-2024)

The Environmental Planning and Assessment Amendment (Terrace Houses) Regulation 2023 introduced new considerations for attached dwellings that may affect deck classifications:

Change	Effect on Deck Inclusion	Effective Date
Expanded definition of “habitable room”	More decks may qualify as habitable space	March 2023
New height measurement standards	Lower thresholds for elevation inclusion	July 2023
Sustainability exemptions	Eco-friendly decks may receive special consideration	November 2023
Digital submission requirements	More detailed deck documentation required	January 2024

10. Professional Advice and Next Steps

Given the complexity of GFA calculations and their significant impact on development projects, we recommend:

1. Consult a Planning Consultant: Professionals specialising in NSW planning laws can provide tailored advice for your specific property and council area.
2. Engage a Surveyor: For precise measurements and documentation of your deck’s dimensions and features.
3. Review Council DCP: Carefully study your local Development Control Plan for specific deck provisions.
4. Consider Pre-DA Meetings: Many councils offer free or low-cost preliminary meetings to discuss your proposal.
5. Document Everything: Keep records of all communications with council and design iterations.

For official guidance, refer to the NSW Planning Portal or contact your local council’s development assessment team.