The Hidden Costs Nobody Talks About

Let's start with the thing that causes the most pain. Not the build itself. The stuff that blindsides people before a single slab of concrete has been poured.

The design trap

One of the most common mistakes — and it's not just granny flats, it happens in renovations and new builds too — is that people get their design done by one company and then take it to a builder for pricing. Sounds logical. It's not.

The problem is that the designer and the builder have never spoken. The design might look great on paper, but nobody has thought about how it's actually going to be built, what it's going to cost, or whether it's going to get approved. By the time you find out there's an issue, you've already paid for plans you can't use.

This is exactly why we operate on a design and construct model. We design it, we build it, we know what everything costs before we put pen to paper. And because we use fixed designs, we already know those designs are going to get approved, as long as we put them on the right block in the right position.

What cheap quotes leave out

A cheap quote is not a good quote. It's a low number designed to get you to sign. Here's what they're quietly leaving out:

• Allowances that don't add up.
  I've seen builders quote a $4,000,000 house and only allow $20,000 for cabinetry. Of course it cost more than that. But most people just look at the total at the bottom and assume everything is covered. It's not.
• Site preparation. This varies a lot from block to block, which is why some builders just low-ball it and hit you with variations later. Pier depth, stormwater connections, retaining walls. These can add up quickly if they're not properly allowed for upfront.
• Electrical board upgrades. This catches a lot of people off guard. If you're adding a whole new dwelling, there's a real chance your main electrical board needs to be upgraded to handle the load. It's common. It adds cost. Most cheap quotes simply don't mention it.

Our approach is the opposite. We try to include as much as possible in the initial quote and work down from there — rather than starting low and adding variations on top. Because that's how a lot of builders make their money.

What to Look for in a Builder — and the Red Flags

Finding a good builder is harder than it should be. Here's how to tell the difference quickly.

What a good builder actually looks like

For us, it comes down to one thing: we want the client to succeed. We're not just trying to get you from enquiry to contract, we're trying to get you from A to B. That means being honest about costs, transparent about what we're allowing for, and actually being interested in your project rather than treating you as just another number.

You should feel like your builder is on your team. If you don't feel that way after your first conversation, trust that instinct.

Why Most People Get This Wrong From the Start

The most common mistake people make before they even pick up the phone is this: they ask someone who got a granny flat built ten years ago how much they paid, and then expect that's still what it costs today.

Build costs have gone up significantly. But here's the thing. Nobody was getting $600 a week rent on a two-bedroom granny flat ten years ago either. The income has kept pace with the cost. The maths still works, arguably better than ever.

CDC vs DA — What's the Difference and Which One You Want

In NSW, there are two ways to get a granny flat approved. CDC (Complying Development) and DA (Development Application). Here's the plain English version.

Our fixed designs are built specifically to comply with CDC requirements. If your block qualifies, we already know the design is going to get approved. No guessing, no council back-and-forth, no months of waiting.

Use the CDC Suitability Checker included in this pack to see if your property is likely to qualify before you do anything else.

Fixed Design vs Custom — Why One is Almost Always the Smarter Choice

We only build fixed designs. That's not for everyone, and we're upfront about that. If you want something totally custom, your own floorplan, a completely unique design, there are plenty of other builders who will do that for you, and that's completely fine.

But here's what fixed designs actually give you as a client:

• Clarity on price. Because we've built the same design before, we know exactly what it costs. No surprises, no guessing.
• Clarity on timeline. We know how long it takes to build. We've done it.
• Clarity on approval. Our designs are built to meet CDC requirements. If your block qualifies, we already know the design will be approved.
• Clarity on the finished product. You can look at photos of the exact same build — not something similar, not previous work that kind of looks like it. The exact same granny flat that you are going to get. That's a big deal.

On finishes, colours, fixtures, that kind of thing, we're flexible. But the floorplan and structural design stays fixed. That's what makes the whole model work.

The Real Numbers — What a Granny Flat Actually Makes You

Let's get into the numbers. Because this is ultimately what it comes down to.

The weekly rent

A two-bedroom granny flat in NSW is currently averaging around $600 per week in rent, depending on suburb. A one-bedroom is around $450 per week. These numbers have moved significantly over the past decade as rental demand has tightened across the state.

Think about that in practical terms. If you have a mortgage on your home or investment property, $600 per week is a meaningful contribution to those repayments. For a lot of people, it's the difference between being comfortable and being stretched.

The equity uplift

This is the part most people don't think about. A granny flat doesn't just generate income. It adds value to your property.

Generally speaking, a granny flat adds approximately 1.2 times the build cost to the value of the land. So if you spend $250,000 on a build, you're typically adding around $300,000 in property value. That's $50,000 in instant equity the day the build is complete.

And that equity compounds over time as your property value grows. Ongoing cashflow from rent, plus capital growth on a higher base value. Both working for you at the same time.

The resale picture

Granny flats are one of the highest searched terms on realestate.com.au right now. Buyers want them. Investors want them. Properties with secondary dwellings sell faster and for more. This is not a niche product anymore. It's a mainstream asset.

Use the Feasibility Calculator included in this pack to run your own numbers based on your specific situation.

The One Question You Should Ask Before Doing Anything Else

It's a simple one:

Think about it seriously. If you've got usable space on your block, you have the ability to add up to $600 a week in rental income, $50,000 or more in instant equity, and a long-term asset that compounds in value over time. An investment that pays itself off in under 10 years and then puts money in your pocket every week after that. Compare that to a house mortgage that can take 30 years or more to pay off.

Build costs have gone up, yes. But so has rental income. The maths still works. And here's something else most people don't realise. Almost anyone who has held onto a property for more than 12 months in a good area likely has close to $50,000 in equity already. Which means they could potentially use that as a deposit to build a granny flat without any additional savings.

The barrier to entry is lower than most people think. And the return on the other side is genuinely significant. There's a reason granny flats are becoming so popular. The numbers make sense.