Class 3 Boarding House, Motel & Hotel Design NSW

Class 3 design requirements

Class 3 buildings have stricter standards than Class 2 apartments because of higher occupant turnover:

• Interconnected smoke alarm systems with central monitoring
• Emergency lighting, exit signage and accessible escape paths
• Fire-rated construction between units
• Accessibility for persons with disability (AS 1428)
• Commercial-grade kitchen, laundry and bathroom facilities

Costs and timeline

Frequently Asked Questions

What is a Class 3 building under the NCC?

Class 3 covers larger accommodation buildings: boarding houses exceeding 12 persons or 300 m², hotels, motels, backpackers, and residential parts of hotels or schools. Class 3 buildings have high occupant turnover and stricter fire safety, accessibility and acoustic requirements than Class 2 apartments.

Do I need a Registered Design Practitioner for a Class 3 building?

Yes — Class 3 buildings are regulated under the NSW DBP Act 2020. All design work must be declared by a Registered Design Practitioner (RDP). giantA is a RDP for Class 3 buildings including boarding houses, motels and backpacker accommodation.

How much does motel or hotel design cost in Sydney?

Small motel (10–20 rooms): design fees $60,000–$150,000. Medium hotel (20–50 rooms): $150,000–$400,000. Fire engineering, accessible design, commercial kitchen and laundry design are additional specialist costs. Total project cost typically exceeds $2 million for new construction.

Can an existing house be converted to a boarding house?

Yes — conversions are common in Sydney's older suburbs. The existing house must be upgraded to Class 1b or Class 3 standards depending on size: interconnected smoke alarms, emergency lighting, fire-rated construction, accessible egress, and commercial-grade facilities. A change of use DA is required.

What fire safety requirements apply to Class 3 buildings?

Class 3 buildings need: interconnecting smoke alarms, emergency lighting, exit signage, fire-rated walls between units, accessible escape paths, and often sprinklers. A fire engineer designs these systems as part of the DA documentation.

How long does Class 3 DA approval take?

Small-scale boarding houses or motels (10–20 rooms): 6–9 months. Medium (20–50 rooms): 9–12 months. Large or complex sites: 12–18+ months. Pre-lodgement meetings with council and traffic/parking studies can significantly reduce assessment time.