Granny Flat Designs & Floor Plans: Maximising 60sqm in Sydney

Under NSW planning rules, a secondary dwelling (granny flat) can be a maximum of 60 square metres of internal floor area. That's not a lot of space — roughly the size of a large one-bedroom apartment. But with smart design, 60sqm can feel genuinely spacious and comfortable.

The difference between a well-designed 60sqm granny flat and a poorly designed one is enormous. A good design maximises natural light, creates efficient circulation (no wasted corridor space), provides adequate storage, and makes the outdoor connection feel like an extension of the indoor living area. A bad design feels cramped, dark, and institutional.

In Western Sydney, where granny flats are used for everything from elderly parent accommodation to high-yield rental properties to home offices, the design needs to match the intended use. A granny flat for a retired parent has different priorities than one designed to maximise rental yield.

This guide covers the most popular and effective granny flat floor plans — studio, 1-bedroom, and 2-bedroom configurations — with dimensions, costs, and design tips specific to Western Sydney lots.

Studio Granny Flat Designs (30–40sqm)

Studio granny flats combine the living, sleeping, and kitchen areas into a single open space, with a separate bathroom. They're the most affordable option and work well for singles, students, or elderly parents who don't need a separate bedroom.

**Studio Plan A: The Compact Studio (30sqm)** Dimensions: 6m x 5m external, approximately 28–30sqm internal • Open living/bedroom area: 18sqm (includes sleeping zone at rear, living zone at front) • Kitchen: Galley-style along one wall (2.4m bench run, wall oven, 2-burner cooktop, bar fridge space) • Bathroom: 3.5sqm (shower, toilet, vanity — no bath) • Storage: Single built-in wardrobe (1.2m wide) + kitchen overhead cupboards

Cost to build: $90,000–$130,000 (turnkey including approvals) Rental yield: $280–$380/week Best for: Single occupants, elderly parent who uses main house for meals/socialising

**Studio Plan B: The Generous Studio (40sqm)** Dimensions: 8m x 5m external, approximately 38–40sqm internal • Open living/bedroom area: 24sqm (clear separation of sleeping and living zones via furniture placement or half-wall) • Kitchen: L-shaped (3.6m total bench run, full oven, 4-burner cooktop, full fridge space, dishwasher space) • Bathroom: 4sqm (shower, toilet, vanity, space for washing machine) • Storage: Double built-in wardrobe (1.8m wide) + linen cupboard • Private courtyard: 8–12sqm paved area with covered entry

Cost to build: $115,000–$155,000 Rental yield: $320–$420/week Best for: Singles or couples, short-term rental (Airbnb), home office/studio conversion

**Studio design tips:** • Orientation: Face the main living/glass wall north or east for morning sun and natural light • Ceiling height: 2.7m minimum (makes a small space feel much larger than standard 2.4m) • Flooring: Continuous floor finish throughout (no transitions) — large-format tiles or hybrid timber extends the visual space • Window placement: Full-height glass on the garden side creates seamless indoor/outdoor connection • Kitchenette lighting: Under-cabinet LED strip lighting makes a galley kitchen feel open after dark • Privacy from main house: Offset the granny flat entrance and windows from the main house's windows. A landscaping screen (bamboo, ornamental grasses) creates a natural privacy barrier for under $1,000

1-Bedroom Granny Flat Designs (45–55sqm)

The 1-bedroom layout is the most popular granny flat design in Western Sydney — it provides a proper separate bedroom while keeping building costs moderate.

**1-Bed Plan A: The Classic (45sqm)** Dimensions: 9m x 5m external, approximately 43–45sqm internal • Bedroom: 10sqm (fits queen bed + bedside tables, built-in wardrobe 1.5m wide) • Living/dining: 14sqm (open-plan, north-facing preferred) • Kitchen: Galley or U-shape (3m bench run, full appliances) • Bathroom: 3.5sqm (shower over bath or shower-only, toilet, vanity) • Laundry: Combined with bathroom or separate 2sqm cupboard • Hallway/circulation: 3sqm

Cost to build: $130,000–$175,000 Rental yield: $380–$500/week

**1-Bed Plan B: The Open Classic (50sqm)** Dimensions: 10m x 5m external, approximately 48–50sqm internal • Bedroom: 12sqm (fits queen bed + dresser, walk-in robe or large built-in 2m wide) • Living/dining: 18sqm (generous open-plan with space for dining table) • Kitchen: L-shape (4m total bench run, island bench optional, full appliances including dishwasher) • Bathroom: 4.5sqm (walk-in shower, toilet, vanity with storage, space for washing machine) • Entry: Covered porch (2sqm internal, 4sqm external) • Storage: Separate linen cupboard in hallway

Cost to build: $145,000–$195,000 Rental yield: $400–$530/week

**1-Bed Plan C: The Premium (55sqm)** Dimensions: 10m x 5.5m external, approximately 53–55sqm internal • Bedroom: 14sqm (master-quality — queen bed, bedside tables, dresser, 2m built-in wardrobe or 4sqm walk-in robe) • Living/dining: 20sqm (spacious, north-facing, bifold doors to patio) • Kitchen: U-shape with breakfast bar (5m bench run, stone benchtop, full appliance suite) • Bathroom: 5sqm (large walk-in shower with niche, toilet, floating vanity with stone top) • Separate laundry cupboard: 1.5sqm (stacked washer/dryer, tub, storage) • Entry: Covered porch with bench seat

Cost to build: $165,000–$220,000 Rental yield: $430–$560/week

**1-bedroom design priorities:** • Bedroom position: Locate away from the main house and neighbours for acoustic privacy. Rear corner is ideal • Living room windows: As large as possible — floor-to-ceiling glass on the garden side • Kitchen ventilation: Rangehood vented externally (not recirculating) — essential for cooking odours in a small space • Bathroom heating: Install a 3-in-1 heat/light/exhaust unit — Western Sydney winters are cold and a small bathroom heats quickly • Storage is king: In a 1-bed granny flat, every square metre of storage is precious. Include overhead kitchen cupboards to the ceiling, a linen cupboard, a broom cupboard, and bedroom storage

2-Bedroom Granny Flat Designs (55–60sqm)

The 2-bedroom granny flat maximises the 60sqm allowance and commands the highest rental yield. It's the best option for investor-builders targeting the family and couple rental market.

**2-Bed Plan A: The Efficient (55sqm)** Dimensions: 10m x 5.5m, approximately 53–55sqm internal • Bedroom 1: 10sqm (queen bed, 1.5m built-in wardrobe) • Bedroom 2: 8sqm (double bed or 2 singles, 1.2m built-in wardrobe) • Living/dining: 14sqm (open-plan, compact but functional) • Kitchen: Galley (2.4m bench run, compact appliances) • Bathroom: 3.5sqm (shower, toilet, vanity, combined laundry space) • Hallway/circulation: 4sqm

Cost to build: $155,000–$210,000 Rental yield: $450–$580/week Best for: Maximum yield on smallest possible 2-bed footprint

**2-Bed Plan B: The Family (58sqm)** Dimensions: 10.5m x 5.5m, approximately 56–58sqm internal • Bedroom 1 (master): 11sqm (queen bed, 1.8m built-in or small WIR) • Bedroom 2: 9sqm (double bed, 1.5m built-in wardrobe) • Living/dining: 16sqm (room for 4-seater dining table and lounge) • Kitchen: L-shape (3.6m bench, full-size fridge, dishwasher) • Bathroom: 4sqm (shower, toilet, vanity) • Separate laundry: 1.5sqm (stacked washer/dryer, tub) • Hallway/entry: 3sqm

Cost to build: $170,000–$230,000 Rental yield: $470–$610/week

**2-Bed Plan C: The Maxed Out (60sqm)** Dimensions: 11m x 5.5m or 10m x 6m, approximately 58–60sqm internal • Bedroom 1 (master): 12sqm (queen bed, 2m built-in wardrobe, bedside tables) • Bedroom 2: 10sqm (double bed, 1.5m built-in, desk space) • Living/dining: 18sqm (generous open-plan with defined zones) • Kitchen: U-shape or L-shape with breakfast bar (4.5m bench, stone benchtop, full appliances) • Bathroom: 4.5sqm (full-size shower, toilet, floating vanity) • Separate laundry: 2sqm (front-loader washer, dryer, tub, overhead storage) • Entry: Covered porch with storage bench • Outdoor: Direct access from living to covered patio (10–15sqm)

Cost to build: $185,000–$250,000 Rental yield: $500–$650/week

**2-bedroom design challenges and solutions:**

Challenge: Two bedrooms + living + kitchen + bathroom in 60sqm leaves no room for waste Solution: Eliminate hallways — use a 'racetrack' layout where rooms open directly to each other or to a central living space. Every metre of hallway in a 60sqm dwelling is wasted space.

Challenge: Both bedrooms need windows but you have limited wall area Solution: Place bedrooms at opposite ends of the plan — each gets an external wall with windows. Avoid putting both bedrooms on the same side.

Challenge: Storage for 2 people is inadequate Solution: Design storage into dead spaces — above doorways, above the washing machine, kickboard drawers in the kitchen, wall-mounted shelving.

Construction Considerations and Getting Started

Regardless of which floor plan you choose, these construction considerations apply to all granny flat builds in Western Sydney:

**Site positioning:** • Rear of the lot is standard — maximum separation from main house • Side positioning works on wide lots (15m+) — allows separate driveway access • Minimum setbacks: 0.9m from side and rear boundaries (most councils) • Must be at least 3m from the main dwelling (BCA fire separation requirement) • Sewer line location often drives position — avoid building over sewer mains

**Foundation options:** • Slab-on-ground (most common): $8,000–$18,000 depending on size and soil class • Pier and bearer (for sloping sites or flood-prone areas): $12,000–$25,000 • Suspended slab (premium, for steep sites): $15,000–$30,000

**Construction methods:** • Traditional brick veneer: Most durable, familiar to tradies, matches main house. $1,800–$2,500/sqm • Timber frame with cladding (Weathertex, Linea board): Faster, modern look. $1,700–$2,400/sqm • Prefabricated/modular: Fastest (6–8 weeks on-site), but limited design flexibility. $2,000–$3,000/sqm • Rendered blockwork: Solid, low-maintenance, good acoustic performance. $1,900–$2,600/sqm

**Construction timeline:** • Approvals (CDC): 3–4 weeks • Slab: 1–2 weeks • Frame and lockup: 3–4 weeks • Internal fit-out: 4–6 weeks • External works and connections: 1–2 weeks • Total: 12–18 weeks (3–4.5 months) from approval

**Service connections (often underestimated in budgets):** • Sewer extension: $3,000–$8,000 (distance from existing sewer point) • Water connection: $1,500–$3,000 • Electricity (sub-board or separate meter): $2,000–$5,000 • Gas (if applicable): $1,500–$3,000 • NBN: Free during construction phase (new connection) • Stormwater connection: $2,000–$5,000

**Total turnkey costs by configuration (2026 Western Sydney averages):** • 30sqm studio: $100,000–$140,000 • 40sqm studio: $125,000–$170,000 • 45sqm 1-bed: $140,000–$190,000 • 50sqm 1-bed: $155,000–$210,000 • 55sqm 2-bed: $175,000–$235,000 • 60sqm 2-bed: $195,000–$260,000

Buildana builds granny flats across all five Western Sydney LGAs — from compact studios to fully-finished 2-bedroom properties. We handle design, approvals, construction, and service connections with a fixed-price turnkey contract. Every granny flat we build is designed specifically for its lot — not a generic plan dropped onto your backyard. Call 0476 300 300 for a free granny flat design consultation. We'll visit your property, assess the best position and layout for your lot, and provide a detailed fixed-price quote within 2 weeks.

Buildana builds across Sydney. Visit /homes/granny-flats to learn more or /approvals/cdc to discuss your project.