Trinity Design & Planning

Design Services

Granny Flat Design

Approval-ready granny flat designs for extended family, rental income or future resale value.

Granny Flat Design

Why build a granny flat?

  • Affordable way to add living space
  • High rental demand across Western Sydney
  • Ideal for multi-generational living
  • Often eligible for CDC
  • Increases overall property value
  • Efficient, low-maintenance design options

Site feasibility assessment

  • 450m² minimum lot size, CDC dependent
  • 12m minimum frontage
  • Sewer mains clearance
  • Private open space ratios
  • Setback controls
  • Existing dwelling placement
Granny flat site plan

Custom floor plans

Plans typically include 1–3 bedrooms, open-plan kitchen/living, laundry, outdoor patio or deck and accessible layouts where required.

Drawings for DA or CDC

  • Site plan
  • Floor plans
  • Elevations
  • Sections
  • Roof plan
  • Window and door schedule
  • BASIX, stormwater and SEE support where needed

Ready to start your project?

Book a free consultation and we'll walk you through the right pathway, timeframe and price.