Marvel Homes
Sydney Build Cost Guide 2026

What does it cost to build a house in Sydney?

Most cost calculators hand you a number that falls apart the moment a real builder prices your site. A quality custom build in Sydney starts from around $3,500 per square metre and runs to about $5,800, but the figure that bites you is what sits on top, and what hides inside an allowance. The kit below shows an honest build range for your project, what is in the price versus on top of it, and the exact questions that pin a real number down with any builder.

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Quality custom & Passive HouseFixed-price contractSydney 2026
Build cost clarity kit

What it costs, and how to pin down the real number.

Shape your project on the left. We show an honest build range, what sits in the price versus on top of it, and the exact questions that pin a real number down with any builder. Download it free, or have the full kit emailed to you. These are planning ranges and prompts, not a quote.

Home size (build area)280 m²
150 m²500 m²+
Finish level

Elevated finishes, joinery and glazing. Where most custom clients sit.

Your block

A slope, reactive soil or tighter access. The common Sydney case.

Anything else in the project?

Toggle what applies. Each one adds its specific questions to your kit. Passive House and a complex block also shift the range.

Knockdown rebuildAn existing home to demolish first.
Certified Passive HouseA measured performance standard.
Swimming poolA pool planned on the site.
Solar & batteryEnergy systems for the home.
Indicative build range
$1.23M – $1.51M
The build itself, at Sydney custom rates of $3,500 to $5,800 / m². Site costs, demolition and landscaping sit on top. A planning range, not a quote.
In the build price
On top, usually separate or your scope
What to watch
  • The range above is the build itself. Site costs, demolition and landscaping sit on top, and they are where two quotes for the ‘same’ house drift thousands apart.
  • Watch the words. “Fixed” should not move. An “allowance” is a placeholder you can blow through. A “provisional sum” is an estimate for work not yet known.
  • At a premium or bespoke finish, the kitchen, bathrooms, tiling and joinery are usually carried as allowances. Ask to see every allowance value in writing, because that is where budgets most often run over.
  • A harder block does not just lift site costs. It adds design and engineering too, more reports and structural work, so a quote that skips them is not really cheaper.
What do fixed, allowance and provisional mean?
  • Fixed. A firm price that should not move once the design is locked.
  • Allowance. An amount set aside for items you finalise later. A good allowance comes with a written specification, so you can see exactly what it includes and what a change will cost. A blind allowance is just a number, and that is where budgets blow out.
  • Provisional sum. An estimate for work not fully known yet, like footings before a soil test. The fair version is carried with agreed rates, so a change is priced at a known number rather than a padded buffer.
  • Excluded. Not in the build price. You arrange or pay for it separately, though a budgeting allowance is sometimes shown so your total project number stays realistic.
  • Scoped vs blind allowance. A scoped allowance names exactly what it includes and its dollar value, so you can see what refining a selection will cost. A blind allowance is just a number with no scope behind it, and that is where budgets blow out.
  • Prime Cost (PC) item. A set amount for a specific product, like tapware, sinks or appliances. You confirm the actual product and the price adjusts to your choice.
  • Rates schedule. Agreed unit rates (per lineal metre of pier, per hour of rock, per load of soil) so provisional work is charged at a known price if the ground differs, not renegotiated mid-build.
  • Home warranty insurance (HBCF). NSW statutory insurance on residential work over $20,000. Ask whether it is included in the price.
Take the right questions to any builder

A branded PDF with your scope and the exact questions to vet any quote. 32 questions across 8 sections tailored to the project above, yours to use with any builder.

Or email me the full illustrated kit + Mo’s cost-blowout checklist

This is a planning range, not a quote. Every builder, brief and block prices differently. The only fixed, line-by-line number for your home comes from a builder pricing your actual site and brief.

Book a Site AssessmentRead what each part covers →
Why per-sqm quotes mislead

Three reasons the headline number is almost never the real number.

1. Site costs vary from $30,000 to $100,000 or more

Excavation, service connection, and retaining vary enormously between blocks. A flat cleared inner-west block and a sloping North Shore site can carry $70,000 of difference in site costs alone.

2. Inclusions lists differ dramatically

One builder's $5,500/sqm may exclude what another builder includes. Without a like-for-like inclusions list, you are not comparing the same thing.

3. Blind allowances mask cost blow-outs

The danger is not the allowance, it is a blind allowance: a number with no scope behind it. It makes a quote look cheaper now and blows out later. A good allowance names exactly what it includes and its dollar value, so you can see what a change will cost. Ask to see the specification behind every allowance before you compare quotes.

What each part of the budget covers

Every build budget groups into the same categories. Some are usually fixed, some are allowances you control, and several common items sit outside the build price entirely. Here is what each group covers, how it is normally carried, and the questions worth asking any builder or consultant.

01
Usually fixed

Design & approvals

The work before the build: design taken to approval, engineering, and the reports your site needs. Some of it is carried by the builder, some you pay directly.

Usually covers
  • Architect or building designer, taken through to approval
  • Design carried as an allowance to a defined scope (hourly rate if it grows)
  • Structural and hydraulic engineering
  • Site reports the build needs: survey, BASIX, stormwater
  • Home warranty insurance (HBCF)
Usually not included, you pay
  • Private certifier (you engage and pay directly, it must be independent; can be included on some projects)
  • Council and authority fees, contributions and the long service levy (never part of the construction price)
  • Special reports your site may need: arborist, bushfire, acoustic, heritage, ecology or a town planner
Questions to ask
  • Is the design fee an allowance to a defined scope, and what is the hourly rate if it goes beyond that?
  • Do I engage and pay the private certifier directly, or is it included?
  • Are council and authority fees, contributions and the long service levy excluded?
  • Which special reports might my site need, and are they allowed for?
  • Who coordinates the consultants if their drawings clash?
Back to the planner ↑
02
Usually fixed

Structure & envelope

The big, should-be-fixed items: frame, roof, walls and windows to lock-up. The slab and steel sit here too, but are usually carried as provisional with agreed rates.

Usually covers
  • Slab, footings and structural steel (provisional, with agreed rates)
  • Wall and roof framing
  • Roof covering, gutters and fascia
  • External walls, cladding or render
  • Windows and external doors to lock-up (allowance with a written specification)
Questions to ask
  • Is the envelope a fixed price, or are parts of it provisional?
  • Are the slab, piers and structural steel carried at agreed rates, or padded as fixed?
  • What window and glazing specification is allowed for?
  • Is retaining priced here, or under site costs?
  • What is specifically excluded from getting to lock-up?
Back to the planner ↑
03
Usually allowances

Internal fit-out & finishes

The part you live with daily: joinery, stone, tiles, floors, bathrooms, lighting and appliances.

Usually covers
  • Kitchen, pantry and laundry joinery
  • Wardrobes and built-in cabinetry
  • Stone benchtops and splashbacks
  • Tiling, flooring and paint
  • Bathroom fixtures, tapware and lighting
  • Appliances
Questions to ask
  • Are the kitchen, bathrooms, tiling and flooring fixed selections, or allowances?
  • Can I see each allowance value in writing?
  • What fixture and appliance tier do the allowances assume?
  • What happens to the price if I select above an allowance?
Back to the planner ↑
04
Usually fixed

Services

The systems running through the home: electrical, plumbing, heating and cooling.

Usually covers
  • Electrical mains, rough-in and fit-off
  • Plumbing and drainage
  • Heating and cooling (split or ducted)
  • Hot water system
  • Gas fitting and compliance
Usually not included, you pay
  • Authority connection and establishment fees
  • Service runs beyond the standard distance (if water, sewer or power are not at the boundary)
  • On-site stormwater detention (OSD) tank
  • Gas appliances and connection to the gas main
  • Pole or meter relocation, and rock excavation in service trenches
Questions to ask
  • Are connections priced only to the boundary, and what happens if a service is across the street?
  • Are authority connection and establishment fees included?
  • How many power points, circuits and lighting points are allowed?
  • Is air conditioning ducted or split, and how many zones?
  • What hot water system is allowed for?
Back to the planner ↑
05
Provisional sum

Site costs

Everything the block itself demands, usually provisional until the ground is tested.

Usually covers
  • Cut, fill and soil removal
  • Piering for reactive soil or rock
  • Retaining walls
  • Stormwater and on-site detention (OSD)
  • Boundary fencing and tree removal
Questions to ask
  • Is sitework fixed or provisional, and based on what assumptions?
  • Has a geotechnical report informed the footings and piering?
  • Is on-site stormwater detention (OSD) required on my block?
  • Are pier, rock and soil-removal rates agreed up front, so a change is charged at a known rate rather than padded into the price?
Back to the planner ↑
06
Excluded, budget allowance

Demolition

Clearing an existing home before the new build can start. Usually excluded from the build price, but shown as a budgeting allowance so your total project number stays realistic.

Usually covers
  • Demolition of the existing home
  • Asbestos identification and removal
  • Power, water, gas and sewer disconnections
  • Site clearing and disposal
Questions to ask
  • Is demolition excluded from the build price, and is a budgeting allowance shown so my total project cost is realistic?
  • Is asbestos handling and disposal allowed for, and is a report required first?
  • Who disconnects the services, and is it priced?
Back to the planner ↑
07
Often separate / your scope

Landscape

The outdoor finishing, almost always separate or your own scope.

Usually covers
  • Turf, gardens and planting
  • Boundary and feature fencing
  • Swimming pool and surrounds
  • Pergola, deck or cabana
  • Outdoor kitchen and lighting
Questions to ask
  • Is any landscaping in the build price, or all by others?
  • If I want a pool, is it a separate trade and contract?
  • Who is responsible for pool fencing compliance and certification?
Back to the planner ↑
08
Often separate / your scope

Driveway & walkways

Getting to and around the home, often excluded or carried as an allowance.

Usually covers
  • Driveway and hardstand
  • Paths and paving
  • Council vehicle crossing (crossover)
  • Edging and surface drainage
Questions to ask
  • Is the driveway and council crossover included, or excluded?
  • What finish and area does any allowance assume?
  • Who applies and pays for the council crossing approval?
Back to the planner ↑
09
Often separate / your scope

Solar & battery

Energy systems, commonly added as an option or after handover.

Usually covers
  • Solar PV panels and inverter
  • Home battery storage
  • EV charger provision
  • Switchboard and metering changes
Questions to ask
  • Is solar or battery included, or added later?
  • What system size and battery capacity is assumed?
  • Is the home wired EV-ready and battery-ready?
Back to the planner ↑
What your block adds to the budget

The site costs that move the number most.

Two identical homes on two different blocks can be tens of thousands apart before a wall goes up. These are the site-specific drivers behind that gap, worth understanding before you commit to a block or a headline price. They are also why a real number needs your actual site, not an average.

Slope
Slope and retaining

A flat, cleared block is the cheap baseline. As the land falls, you pay for cut and fill, retaining walls, and often a split-level design or a drop-edge slab. A steep site can add tens of thousands before the house itself begins.

Geotech
Soil and rock

The soil report sets how the foundation is built. Reactive clay or rock means deeper piers or rock excavation, priced from an educated assumption and confirmed on site. We agree pier rates up front, so a depth change adjusts fairly rather than inflating the contract.

Stormwater
On-site detention (OSD)

Where council requires it, an OSD tank holds stormwater and releases it slowly. Its size scales with your roof and paved area and the drainage downstream, so on a tight or downhill block it becomes a genuine line item, not a rounding error.

Knockdown
Demolition and clearing

On a knockdown rebuild, removing the existing home, disconnecting services and clearing the block is its own cost. Where asbestos is present, it is handled under strict rules and adds to the figure.

Services
Power, water, sewer, gas

Connecting or upgrading services depends on what already sits at the boundary. A long run, a capacity upgrade, or relocating a sewer line that crosses the block can move the number significantly.

Access
Site access and storage

A narrow frontage, a corner block, or no room to store materials changes how trades work and what machinery fits. Tight access quietly lifts both labour and logistics costs.

What a real cost picture looks like

Line-item fixed-price, not guesswork.

Marvel's fixed-price contract replaces per-sqm guessing with a line-by-line cost built around your specific brief. Where an allowance is used, it carries a written specification and a dollar value, so you can see what it buys and what refining a selection would cost. The few provisional items, like piers or rock, are carried at agreed rates rather than open-ended buffers. Variations you initiate are priced and signed off before any work proceeds. Verify any builder's licence before signing a contract at NSW Fair Trading.

That transparency requires a paid pre-construction phase, but the result is a number the builder and the client both trust. If you are comparing a rebuild against a certified Passivhaus spec, the Passive House cost in Sydney page has the specific bands.

See our pre-construction process
When to engage a builder on cost

If these three things are true, we should talk.

  • You have a block, or are imminently purchasing one.
  • Your budget allows $900k+ construction cost.
  • You value process certainty over the cheapest headline number.

Don't engage volume builders if you want transparency. Their business model requires per-sqm averages.

Questions

Frequently asked

  • A quality custom home starts from around $3,500 per sqm of build area, with premium and architectural builds running higher. Volume project homes can be lower but are not comparable on quality or inclusions. Site costs are added on top.
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Next step

Book a discovery call.

30 minutes with Mo. We'll talk through your brief, budget and block, and tell you honestly whether a Marvel build is the right fit. No sales pitch.

Book a discovery callPassive House cost in Sydney →