1 or 2 bedrooms
Choose a layout that suits your block and future tenants.
Granny Flat Builders Sydney
Turn your backyard into a second income. Without confusing quotes, council stress or chasing trades.
Build a granny flat on the land you already own. Our Sydney team helps with the design, approvals and build — so you have one team to call.
Claim Free Build Assessment
No pressure. No need to commit to a build.
Plus a landscaping bonus
with your new build if you commit
with your new build if you commit
What's Included
A new home for paying tenants.
A new home for paying tenants.
Built on your block.
A private, self-contained home with the everyday basics covered.
A full kitchen
Space to cook, store food and enjoy a meal.
Bathroom & laundry
A private bathroom and space to do the washing.
A modern exterior
A fresh look that works with your main home.
Help with approvals
We check which approval steps your property needs.
A clear build timeline
Know the planned steps and timing before work starts.
Your granny flat team
Why build with Mamba?
A granny flat team that makes each step easier to understand.
Designed for tenants
Useful storage, private access and rooms that work.
Your block checked first
We look at access, services and things that may affect the job.
Help with council
We organise the plans and approval tasks in your quote.
Clear, written pricing
See what is included, what costs extra and what still needs checking.
One point of contact
Get updates and answers from one team.
Support after handover
A clear way to report problems covered by your contract.
Your free build site assessment
Before you build,
Before you build,
get six clear answers.
We look at your plans and help you understand what comes next.
Will a granny flat fit?
We look at your space, access and the main things that need checking.
Should I choose one or two bedrooms?
Talk through room sizes, privacy and what could suit your tenants.
What approvals will I need?
Learn whether your block may suit a CDC or needs a council application.
What could the build cost?
Find out how access, ground works and water or power connections may affect the price.
What rent could it earn?
We help you understand the layout and build costs. A local property manager can give you a separate rent estimate.
What do I do next?
Get a simple written summary of the next steps for your block.
We handle the steps. You stay in the loop.
Your granny flat.
Your granny flat.
Without the runaround.
We guide you through the choices, organise the paperwork and manage the build.
Show us your block
Tell us what you want to build. We look at your space, access and plans.
Choose your layout
We help you choose the design. You review the price and what is included.
We handle the paperwork
We arrange the plans and approval tasks listed in your quote. You get updates along the way.
We manage the build
We organise the trades, checks and handover. You have one team to call.
What about council? We help handle that too.
Some blocks qualify for a Complying Development Certificate (CDC).
Others need a Development Application (DA) through council.
We help work out which path applies and organise the approval tasks in your quote.
How do we compare?
Mamba Constructions
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A layout that makes your block work harder.
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Clear costs before you commit.
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Approval paperwork organised for you.
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One team to call. Less chasing.
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A clear plan to fix covered defects.
Project-Builder
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A standard layout can mean costly changes.
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Missing inclusions can stretch your budget.
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Excluded approval work becomes your job.
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Split contacts can mean more chasing.
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Unclear terms can make fixes harder.
Mamba’s Iron Clad
4 Hoop Guarantee*
Clear pricing. Your say on changes. Proper building checks. Help with covered defects.
Draft guarantee · See what is covered
Homeowner experiences
What a better build feels like.
Penrith, Sydney
★★★★★
“We wanted to know what would fit on our block. Having the layout, costs and next steps explained made it much easier to decide.”
Castle Hill, Sydney
★★★★★
“We wanted two bedrooms for tenants. The plan made room for storage, a separate entrance and privacy.”
Blacktown, Sydney
★★★★★
“The quote showed what was included and what still needed checking. That helped us understand the whole job.”
Glenmore Park, Sydney
★★★★★
“We did not know where to start with approvals. Having the steps explained took a lot of stress out of it.”
Kellyville, Sydney
★★★★★
“It helped to have one team to call. We knew what was happening and when we needed to make a choice.”
Parramatta, Sydney
★★★★★
“We wanted it to feel like a proper home. The kitchen, laundry and outdoor access all worked well together.”
Your free build assessment
Your first step is free.
Your first step is free.
Here’s what you get.
Your Granny Flat Starter Package
Clear answers now. An extra bonus when you build.
Site Assessment
Find out what could fit on your block.
Simple Written Report
Your options, main cost factors and next steps in one place.
Help With Council
Understand the approval path and paperwork your block may need.
Guarantee & Timeline Guide
Know the planned build steps and what the proposed guarantee covers.
FREE BONUS WITH AN ELIGIBLE BUILD
$5,000*
Landscaping Starter Package
Up to 30m² of turf, 6m² of concrete path, a standard clothesline and letterbox. Supply and installation included within the agreed scope.*
Full package value* $6,000
Today = FREE
Your assessment and guides are free now.
The landscaping bonus comes with an eligible signed build contract.
Your free first step
Could your property
Could your property
earn a second income?
Tell us about your block. We’ll talk through your plans and help you take the next step.
Answer five quick questions to request your free assessment.
Your request has been received.
Mamba will contact you about your property. Your appointment is confirmed separately.
Choose An Appointment →
Your questions answered
Simple answers.
Simple answers.
Clear next steps.
Can I build a granny flat on my block?
It depends on your land, access, space and local rules. We start by looking at your block and explain what needs checking.
Will you help with council?
Yes. We organise the plans and approval tasks in your quote. Some blocks may use a CDC. Others need a DA through council. The council or certifier makes the final decision.
How much rent could I earn?
Rent depends on your suburb, layout and local demand. Ask a local property manager for a rent estimate. Remember to allow for loan costs, upkeep, fees and times when the property is empty. Rental income is not guaranteed.
How much will it cost to build?
The price depends on the design, access, ground works and service connections. We explain the main cost factors, then provide a quote once the work is clearly set out.
How long will the build take?
We talk through the planned timeline for your block. Plans and approvals come before building starts. Your contract sets out the timing and what may change it.
What do I get in the free report?
A simple written summary of the options discussed, main cost factors and next steps. It is an early guide, not a formal planning, engineering or rental report.
Is the landscaping bonus free with the assessment?
No. The assessment and guides are free with no need to build. The landscaping bonus is included at no extra charge only with an eligible signed build contract.
What does the guarantee cover?
The proposed guarantee covers clear pricing, approval of changes, required building checks and help with covered defects. The final terms must be agreed in writing. Your legal rights still apply.