Granny Flat Design
Buildana Idris
50m² · 2 bed · 1 bath · indicative $175,000 from
All floor plans and room sizes are fully customisable.
About this design
2 bed, 1 bath, 50m². The Idris keeps it honest — 2 bedrooms, living space, bathroom and laundry. If you're quoting this one, the footprint is clean enough that trades won't be crawling over each other. That matters.
Idris is wise and respected—clean, premium heritage. This 50m² design carries that quality. Two bedrooms, one bath, built with the kind of thoughtfulness that earns respect. In a market full of rushed builds and corner-cutting, that distinction matters. Idris is Buildana's answer to that.
Compact doesn't mean compromised. It means everything in this design is purposeful and built with intention.
Room dimensions
What's included as standard
All Buildana designs are delivered fully finished. The Idris's standard inclusions are listed below. Good quality across every room, and all of it can be tailored to your preferences during the design phase.
Bathroom Inclusions
- •Floor to ceiling wall tiles, including 300 x 600 ceramic tile options.
- •Stylus Banksia back to wall dual flush wc.
- •750mm polyurethane vanity with stone top, drop-in sink & mirror over.
- •Look vanity and shower mixers.
- •Look towel rail & toilet roll holder.
- •Framed shower screen.
- •Light, fan and heater combination.
Kitchen Inclusions
- •Sprayed polyurethane doors and panels (any colour of your choice).
- •10m cabinets includes upper, lower & overhead fridge cabinets & pantry.
- •600mm full length pantry with microwave space.
- •Laminate benchtop, tiled splashback – includes 300 x 600 options.
- •Westinghouse oven and ceramic cooktop (gas cooktops where available).
- •Ducted slide out rangehood (Euromaid), Clark 1 3/4 bowl with ‘look’ mixer.
Upgrade options
Tick what you want — your indicative total updates live. Final fixed price comes back in your formal proposal after a site assessment.
Exterior finish system
Choose the wall system for the external envelope. Pricing below is calculated against this design's external wall area — approximately 66m² (perimeter 28.8m × 2.7m wall height, less 15% for openings). Standard polystyrene-render is included; Hebel, face brick and brick-render are priced as upgrades over standard.
Foamboard polystyrene cladding system finished with cement render and texture coat. Included in the base price — light, fast to install, and the standard exterior on every Buildana granny flat.
Ceiling height
Standard ceiling height is 2.4m. Higher ceilings make small footprints feel larger and lift natural light through windows. Pricing below is calculated against this design's external perimeter 28.8m, covering the extra wall framing, plasterboard, render/cladding and cornice/painting needed to raise the envelope.
Standard ceiling height across all Buildana granny flats — already 100mm taller than the BCA minimum for habitable rooms. Included in the base price.
Doors & highlight windows
Door height and highlight-window upgrades. Tall doors are typically chosen alongside the 2.7m or 3.0m ceiling upgrade so the proportions stay right.
Slim 300 x 600mm highlight windows for natural light to bathrooms, ensuites, hallways, walk-in robes or above kitchen benches. Frosted or clear glazing. $1,100 each, supplied and installed. Pick how many you'd like below.
Premium fitout
Lift the standard spec to higher-end finishes.
Air conditioning
Choose how the granny flat is cooled. The standard living split is included in your base price.
Included as standard. Wall-mount inverter split unit to the living area, sized to the room load.
Outdoor & site
Pricing varies with site conditions, falls, and existing services. Final figures confirmed in writing after a site visit.
Compliance, services & metering
Almost always required for tenanted secondary dwellings. Pre-ticked by default.
Add-on rooms & layout changes
Layout extensions are quoted from your block survey — they may need a fresh CDC/DA pathway.
Common questions
Why pick the 50m² Idris over the 60m² designs?
Two reasons. Either the block can't fit 60m² inside the rear setbacks (anything tighter than ~13.5m of clear depth becomes a problem), or you want to spend the saved square metres on premium fitout instead — Idris with stone benchtops, frameless screen and ducted A/C still lands well under a base-spec 60m² with no upgrades. Same Buildana standard, smaller envelope.
How long does it take to build the Idris?
Allow about 14–18 weeks on site once the slab is poured, plus 6–10 weeks for design, engineering, BASIX, CDC or DA, and pre-construction. Total wall-clock from signed proposal to handover is typically 5–7 months for the Idris, weather and council pace dependent. We update the program weekly during construction so you can see exactly where the build is up to.
Is the Idris BASIX and SEPP-compliant?
Yes. Every Buildana design is built to current BASIX targets (5-star minimum as standard, 7-star available as an upgrade) and within SEPP (Housing) 2021 thresholds (50m² internal, single storey, single secondary dwelling per lot). We run BASIX modelling specific to your block's orientation and shading before lodging — not a generic certificate.
Does the Idris go through CDC or DA?
Almost always CDC (Complying Development Certificate) — that's what SEPP (Housing) 2021 was set up to enable. CDC is faster (10 working days statutory) and cheaper than DA. The Idris only needs DA if your block has heritage overlay, bushfire BAL-29 or above, flood zone, or a council that's opted out of CDC for secondary dwellings. We confirm which pathway applies during the free block check.
Request a formal proposal for the Idris
Pick your upgrades, send through your details, and we'll come back with a fixed-price proposal — usually within 3 business days.