If you want a second dwelling that feels like a proper home but does not swallow the whole backyard, one-bedroom granny flat designs are often the sweet spot. They give you a real bedroom, a separate living space and a full kitchen, without the footprint of a two-bedroom build.
This guide runs through who a one-bedroom layout suits, how the rooms tend to be arranged, and a few of our designs that work nicely on a typical Sydney block.
A one-bedroom layout hits a lot of common needs. It is roomy enough to live in long term but compact enough to keep costs and yard impact down. The people who tend to choose it are:
If you are torn between this and something smaller, our comparison of a studio versus a one-bedroom granny flat lays out the trade-offs in plain terms.
Most one-bedroom granny flats put the bedroom and bathroom at the quiet end and open up the kitchen and living into one bright space. That open-plan feel is what stops a smaller home from feeling cramped. A covered deck or alfresco off the living area adds usable space without counting towards your internal floor area.
Remember the rule: under the NSW Housing SEPP the maximum internal floor area is 60 square metres, and covered patios and verandahs sit outside that. So a one-bedroom design can still have a generous outdoor area attached.
If you want the full 60 square metres with a single bedroom, the Avoca 60 one-bedroom with alfresco spreads that floor area across big living spaces and a relaxed outdoor zone. It is a great fit for owners who want a one-bedroom home that still feels spacious.
For a tighter footprint, the Sea Breeze 40 one-bedroom trims the floor area while keeping a proper bedroom, bathroom and living area. It suits narrower blocks or owners who want to keep more of the yard.
If you want compact but still want an ensuite, the Oakdale 33 one-bedroom with ensuite is a smart little home. At 33 square metres it slots onto smaller Sydney blocks and is a good choice when budget and footprint both matter.
Start with the block, not the design. Most blocks of 450 square metres or more in a residential zone can have a granny flat approved through the Complying Development Certificate (CDC) pathway, which is assessed by a private certifier and usually takes about 10 to 20 business days. Sites that do not meet the criteria go through a council Development Application instead.
Once you know your block clears the size and setback rules, the size of the granny flat comes down to budget and what the space is for. A bigger Avoca 60 will cost more than a compact Oakdale 33, but it gives more living area for long-term occupants. Browse the full range to compare footprints side by side.
Treat these as a guide, since the final price depends on your site and inclusions. A base one or two-bedroom build is roughly $110,000 to $150,000, and per square metre the build runs about $2,200 to $3,300 depending on spec. A complete, finished granny flat in Sydney usually lands between about $120,000 and $300,000 once you add site works, services and approval.
A smaller one-bedroom design naturally sits at the lower end. For the full picture on extras like service connections and site prep, our NSW granny flat cost guide for 2026 breaks it all down.
Yes. A one-bedroom dwelling typically attracts a single tenant or a couple, and the layout reads as a complete home rather than a studio. It is one of the more popular rental sizes in Sydney.
You can. Covered patios, verandahs and carports sit outside the 60 square metre internal limit, so an alfresco or deck adds living space without counting against your floor area.
The right one-bedroom design depends on your block, your budget and who is going to live there. Take a look at our granny flats and studios page, then contact us for a fixed quote and some honest advice. We have been building modular and transportable homes in NSW for over 30 years, and we are happy to help you land on the layout that fits.
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