What is included in the CJG price?

Architectural and structural design, manufacture, transport to site, assembly, project management, plumbing and electrical, Contract Works insurance during the build, building consent management where needed, and a 10-year warranty insured by a third party. The price is confirmed after site review, with no variations during construction.

How long does CJG take to build a house in NZ?

Up to 50% faster than conventional construction. A 70 m2 granny flat takes four to five months and a 200 m2 home about six, against 12 to 18 months for a conventional build. Manufacturing runs while the consent is processed.

Is the CJG system certified in New Zealand?

The system is designed to meet NZ Building Code requirements. Certification is in progress. Our consents partner can take you through the detail for your project.

Steel frame construction · Auckland and New Zealand

Built better.
Priced fairly.

New Zealand's climate is demanding. High humidity, heavy rainfall, seismic activity and significant temperature swings put every building to the test. CJG's steel structure and EPS panel system was designed for exactly these conditions.

It builds up to 50% faster than conventional construction. Not because corners are cut. Because your building is manufactured while consent is processed, then assembled on site. You decide how you want your home or facility. We handle everything else.

Get a free quote +64 21 029 10702

Up to 50%

faster to build

One price

confirmed after site review

10 years

warranty, insured

Design

included in every price

$Concept render of a single-level Castro James Group home$

Our philosophy

The system that makes sense
for New Zealand.

Built better. Priced fairly.

New Zealand's climate demands a construction system built for it. When you look at the materials, a steel structure, wall panels with no timber inside them, and insulation that runs continuously with no studs breaking it, they make sense for this country.

When you see how the price works, one price confirmed after site review with no variations during construction, that makes sense too.

When you see the build time, up to 50% faster than conventional construction, that makes sense as well.

When you understand that the same system can be extended as your life changes, a granny flat that grows into a family home or a facility that adapts as your business evolves, that makes sense most of all.

Designed to meet NZ Building Code requirements. Certification in progress.

Why CJG

Every advantage.
No trade-offs.

Every point below comes from how the system is built, for New Zealand's conditions.

Designed for this climate

Built for New Zealand's conditions

Designed for humidity, rainfall, wind and ground movement.

New Zealand asks a lot of its buildings. High humidity, heavy rainfall, strong wind and seismic activity all test a structure over decades. CJG's system was designed around these conditions. Designed to meet NZ Building Code requirements. Certification in progress.

No timber

In the walls. Steel skins, insulating core

Nothing in the wall to rot

Steel skins bonded to an EPS core. Nothing to rot, nothing to feed borer.

A timber-framed wall carries organic material that moisture and borer can attack. A CJG wall panel is two steel skins bonded to an EPS core, with no timber studs inside it. There is nothing in the wall to rot and nothing for borer to feed on.

No studs

Continuous insulation

Insulation without gaps

No studs breaking the insulation, so no thermal bridges through the frame.

In a timber frame, every stud is a break in the insulation. A CJG panel is insulated edge to edge, with no studs running through it, so the insulation is continuous across the wall.

To design

Manufactured to your plan

Not a catalogue

Your design, manufactured to measure.

Sizes you see from us are costing examples, not a fixed range. Your building is designed for your site and your brief, then manufactured to those exact dimensions.

Pre-cut

Cut to specification and numbered

Ready to assemble

Panels arrive cut to specification and numbered for assembly.

Every panel is cut in the factory to your drawings and numbered for its place in the building. Less cutting on site, less waste, and an assembly sequence planned before anything arrives.

Up to 50%

Faster than conventional construction

Move in sooner

A 70 m² granny flat in four to five months. A 200 m² home in about six.

Conventional builds typically take 12 to 18 months. Because your building is manufactured while consent is processed, then assembled rather than built stick by stick, a 70 m² granny flat takes four to five months and a 200 m² home about six.

Expandable

Add space later

Built to grow with you

Start with what you need today. Extend when you are ready.

A granny flat today can become a family home when the time is right. A warehouse with one office today can have more offices later. The system is designed with future extension in mind. Your building is a starting point, not a fixed decision.

Consent

Managed at no extra charge

We handle the paperwork

Building consent managed for you, at no extra charge.

Where your project needs a building consent, we prepare and manage the application as part of the service. There is no separate fee for it.

70 m²

Granny flats without building consent

No building consent needed

Since January 2026, when the exemption conditions are met.

Since 15 January 2026, a granny flat up to 70 m² can be built without a building consent when it meets the exemption conditions, including single storey, set distances from boundaries and council notification. It must still comply with the Building Code. We check your site against every condition before you commit.

40/30/30

Clear payment stages

You pay as it progresses

40% on signing, 30% when the structure leaves the factory, 30% on practical completion.

Payments are tied to visible stages of your project. You know in advance what is due, when, and why.

Stages

Visible progress, design to handover

You always know where your build is

Defined stages from design to handover.

Every project runs through the same defined stages, from design to handover. At any point you know which stage your build is in and what comes next.

10 yrs

Warranty, third-party insured

Backed by 10 years

A 10-year warranty, insured by a third party.

Your building comes with a 10-year warranty from handover, insured by a third party and included in the price.

Who we build for

One system.
Every project.

The same structural performance applied to every type of build. What changes is how we apply it.

Concept render of a CJG residential home

Homes · Granny flats · Rebuilds

For families, homeowners and investors

Whether you are building your first home, adding a granny flat for rental income or family, rebuilding on land you already own, or starting small with a plan to extend, CJG delivers a building designed for your site, at one price confirmed before we build.

New homes, designed from scratch for your site
Granny flats to 70 m², no building consent needed when the conditions are met
Multi-generational homes, with separate living for each generation
Expandable structures, start with what you need and extend when ready

Get a quote for your residential project

Warehouses · Offices · Facilities

For businesses that need space that performs

CJG builds commercial facilities designed around how your business works. Need offices inside a warehouse? A standalone building for your business? A facility that adapts as the team grows?

Warehouses with integrated offices
Standalone office buildings
Adaptable facilities, reconfigured as your business changes
Commercial builds for owner-occupiers and investors

Discuss your commercial project

Your land · Our expertise

For landowners ready to do more

Your land is an asset. CJG explains every option honestly, whether to sell, joint venture or develop, with no pressure and no commitment required. If you decide to build, we manage everything from first design to handover.

Honest feasibility conversation, so you understand your options first
Joint venture structures available
Single builds or multi-unit developments
Faster build means your asset returns sooner

Explore what your land could become

Better margins · Shorter cycles

For developers who run the numbers carefully

Up to 50% faster delivery and one price confirmed after site review change the economics of every development. One construction partner, consistent quality across every unit, and a process that does not surprise you mid-project.

Residential developments, townhouses and multi-unit
One price, one contract, one team
No variations executed without your written approval
Shorter build cycle means less construction financing cost

Talk about your next development

Our process

From first conversation
to keys in hand.

Nine steps. One team. No surprises.

Initial consultation

We listen first. You tell us what you want to build, where, and what matters most. We give you an honest estimate, and a confirmed price after we review your site. No base rates. No hidden extras discovered later.

Design and structural calculations

Our team designs your project from scratch based on your brief, your site and your preferences. Every design is bespoke. Architectural and structural design are included in the price.

Quote approved. Contract signed.

You receive a full itemised quote. We walk through it together. Once you are satisfied, the contract is signed and the 40% deposit is paid. The next payments follow the build: 30% when the structure leaves the factory, 30% on practical completion.

Manufacturing and consent simultaneously

Most builders wait for consent before ordering materials. We do not. Manufacturing of your steel frame and EPS panels begins at the same time as the consent application is processed with your local council.

This is why CJG builds faster. Weeks saved on every project.

Shipment arrives on site

Your structural components arrive on site on schedule, cut to specification and ready to install. No waiting. No reordering. No delays caused by material management.

Construction and installation

Steel frame erected, EPS panels installed, interior cladding fitted. Your building takes shape on a timeline you can see from day one.

Finishing

Kitchen, bathroom, flooring, electrical and plumbing completed to the specification agreed at contract stage. Standard or premium. Everything decided before work begins. Nothing changed without your written approval.

Handover

We hand you the keys to your completed building, with full handover documentation. Your 10-year warranty begins on this day.

After handover

CJG does not disappear after the keys are handed over. Your 10-year warranty is active. Our team is reachable. If anything needs attention in the first decade, we are the people you call.

Built better.Priced fairly.

The system that makes sensefor New Zealand.

Every advantage.No trade-offs.

One system.Every project.