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Seamless Home Extensions
in Christchurch & North Canterbury

Love where you live but need more space? At Gareth Davis Builders, we specialise in quality home extensions that help Canterbury homeowners create more functional homes without the stress of moving.

A Better Extension Experience
With Gareth Davis Builders

You love your home and neighbourhood, but your current space is no longer cutting the mustard? We know the feeling. And we know the solution! A well-designed extension can completely change the way you live in your home. By creating more space you can have a home that feels comfortable, functional, and enjoyable again without the worry of having to move.

At Gareth Davis Builders, we understand that extending your home is about more than adding square metres. It is about creating spaces where your family can grow, connect, relax, and make memories for years to come. Whether you need more room for a growing family, an extra living area, or simply a home that works better for everyday life, we take the time to understand how you want to live in the space.

Unlike builders who mainly focus on new builds, our team genuinely enjoys the problem solving and attention to detail that comes with extensions and renovations. When blending new and existing spaces seamlessly, we pride ourselves on delivering a smooth and enjoyable experience for our clients and a quality extension that feels like it has always belonged there.

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Our Home Extension Services

Extensions Designed For Better Living

Transform your entire home with more space.

Love your home and neighbourhood, but need more space?We build seamless extensions that improve flow, functionality, and everyday comfort.

From open plan living areas and kitchen extensions to extra bedrooms, bathrooms, and family spaces, we create practical additions that feel naturally connected to your existing home.

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Second Storey Extensions

Can’t go out? Go up!

If your section size is limited, building up can be a smart solution. Second storey additions can dramatically increase living space while maintaining valuable outdoor areas. These projects require careful planning and experience to ensure the new addition integrates well structurally and visually with the existing home.

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Garages, Workshops & Home Offices

More Room for Activities

We build practical extensions for garages, workshops, storage areas, and home offices that improve the functionality of your property and adapt to changing lifestyles.

We create additions that feel well integrated with your existing home while adding long-term practicality and value.

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Frequently Asked Questions
About Home Extensions

Why hire an extension specialist instead of a general builder?

Renovations require a very different skillset to new builds. Working with existing homes involves problem solving, careful planning, great communication, and attention to detail. At Gareth Davis Builders, renovations and extensions are a core part of what we do, and our team genuinely enjoys the process of transforming homes.

For more detailed information, read our article on the importance of choosing a specialist renovation builder.

Will the extension match my existing home?

A good extension should feel like it has always belonged there. We work with experienced designers and place a strong focus on blending new and existing spaces through careful detailing, material selection, rooflines, and finishes to create a seamless result.

Can you help with extension design and planning?

Absolutely, we love to help with the planning and design phase. We have trusted designers and architects we work along side to provide you a full design and build service, or we can work with a designer of your choice.

How much does it cost to extend your home in Christchurch or North Canterbury?

The cost of a home extension depends on the size, complexity, design, and level of finish. Factors such as plumbing, structural work, kitchens, bathrooms, and site access can all impact pricing. We are happy to discuss your ideas and provide guidance on realistic budgets during the early planning stage.

For a more detailed breakdown of renovation costs, budgeting tips, and the factors that can affect pricing, read our article on what a home renovation can cost in Christchurch and North Canterbury.

What types of extensions do you build?

We build a wide range of home extensions including living area extensions, kitchen and dining additions, extra bedrooms, master suites, second storey additions, garages, workshops, home offices, and outdoor living spaces.

Can we live in our home during the extension?

Often, yes, although it depends on the scope of the work. Many clients remain living in their home during the build, and we carefully plan projects to minimise disruption wherever possible. For larger or more complex extensions, temporary accommodation may sometimes be recommended.

What areas do you service?

We work across North Canterbury in the Waimakariri and Hurunui districts.  We focus Rangiora, Kaiapoi, Pegasus, Woodend, Amberley and surrounding areas, and we also service the northern suburbs of Christchurch.

Do you offer fixed-price contracts?

Yes, we typically work with fixed-price contracts to give you certainty and peace of mind around the overall cost of your project. However, when adding an extension, there can be unforeseen elements that only become clear once the job is underway. In these cases, we’ll discuss any required variations with you, and it’s wise to have a contingency budget in place to cover unexpected work if needed.

How do I get started with a extension project?

The best place to start is by getting in touch with us for an initial conversation. We can discuss your ideas, budget, timeframe, and whether your extension project is likely to be a good fit before moving to the next stage.

Our Extension Process

01.

Initial Consultation

We start with a no-obligation consultation to understand your goals, budget, and timeline. Whether it’s a small extension, or you are adding significant space to your home, we will tailor the process to you.

02.

Design & Planning

We work with you to plan your design, select materials, and finalise a realistic budget. We collaborate with our designer, or yours to create a seamless addition to your home.

03.

Consent & Final Quote

The deisgner will handle the council consent process. Once consented, we review the approved council issued plans and finalise the quote to ensure everything aligns with your budget before construction begins.

04.

Contract Signing

Once the quote is approved, we prepare a Master Builders contract covering scope, timeline, payments, and guarantees, along with issuing a deposit for 10% of the contract price. Once we receive a signed contract and deposit, work on your new extension will begin.

05.

Construction Begins

The exciting part – we break ground. We manage the build from start to finish, keeping you informed and on track throughout.

06.

Handover

Once finished and signed off, we hand over the keys and do a final walkthrough to ensure you’re happy.

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What Our Clients Say

Cannot recommend Gareth and his team enough! They took on a complex renovation of our 1950’s property and the end result is fantastic. Throughout the entire process, there was clear and effective communication so we always knew what was going on. We also threw a fair few number of scope changes into the mix, which Gareth and his team handled with ease.

Would highly recommend these guys if you’re planning a similar project!

Josh S

We recently had alterations done to our home by Gareth Davis Builders and we are really happy with the result. The workmanship was excellent, the communication was clear throughout, and the whole project was handled in a friendly and professional manner.
Nothing was ever a problem and every detail was taken care of, and the team was reliable, tidy, and respectful of our home.
Our home lacked a proper front entrance and the final outcome certainly gave us that and has made a huge difference to how visitors arrive.
We’d happily recommend them to anyone.

Adrian and Trish

Gareth and his team built our home in 2020. We had no experience in building previously and Gareth was able to make the process as stress free and seamless as possible. The build ran ahead of schedule and we are absolutely thrilled with our house. Would highly recommend Gareth to anyone looking to build or renovate!

Tim M

This is the second time we have used Gareth Davis builders; first for an expansive deck and this time for kitchen, dining living renno. They are a great skilled team, subies used also fantastic. They are flexible, nothing's a problem, they listened to what we wanted and completed the job to a high standard. We are super stoked with the results. Will definitely use again.

Claire K

Gareth Davis Builders have undertaken a number of alteration projects for me over the years, both residential and light commercial in nature.

Gareth is an excellent communicator, is extremely approachable and keeps me informed throughout each project. He is always willing to work with me to achieve the desired outcome and nothing is ever too much trouble to him.

His team are professional, reliable and efficient. They are excellent problem solvers and use their extensive knowledge to offer recommendations and solutions throughout the build. They run a tidy site and have exceptional attention to detail.

I can confidently recommend Gareth Davis Builders to anyone who wishes to take on their next building project.

John M

Gareth and his team are absolute experts in their craft. We engaged them to undertake a complex renovation on a 1950’s property, which included relocating a kitchen, creating a new bedroom, two new bathrooms, a new roof and re-cladding a garage. Throughout the process communication was clear and efficient, with Gareth managing multiple scope changes and a series of different subcontractors with ease. The quality of the work was top notch and often above and beyond expectation.

We will definitely be using Gareth again in the future and would highly recommend him to anyone looking to take on a similar scale renovation. Thank you for all your hard work!

John & Nicole

Having been a Registered Architect for more than 30 years, I have worked with a lot of builders, some good, others not so good.

When the time came to carry out earthquake repairs and completion of our own house, I wanted a builder who was trustworthy, honest, a good communicator and open to a challenge or three. And preferably someone who would be on site and on the tools, not just the phone.

Gareth had built a small house for some clients in Pegasus a few years earlier and I was impressed by his attention to detail and the tidy site.

Our own project was a different story. It involved some fairly new building products and systems, a few unusual materials, and as you can imagine with an architect’s house some tricky detailing. Gareth took it all in his stride, thought it through and came up with some good solutions. Nothing was ever a problem, and he went the extra mile on several occasions when unexpected weather and other events occurred.

We are very happy with the end result, and I have no hesitation in recommending Gareth and his team to any discerning clients.

David M

Gareth Davis and his team made our investment property renovation an enjoyable experience.

We wanted to be actively involved (get on the tools). In the planning phase we met with Gareth and sought guidance in how involved we could be and what work we could do to help save on some costs. Thinking this may be an issue we were pleasantly surprised to see how at ease Gareth was with us being involved.

Gareth project managed other trades and also kept us well informed of where we were at and what had to be done. Gareth and his team took around 7 weeks to do their part of the renovations so that we could start the exciting task of painting inside and out.

They are a professional outfit who are flexible and will do their utmost to tackle any challenge. Thank you Gareth, Dan and Harry. You guys were great to work with and we will most definitely work with you again as well as be recommending you to others.

Straton & Vicky

We have just completed our second new build with Gareth. The team at Gareth Davis Builders went above and beyond to help our dreams come to life. From helping us to refine our plans with a tight budget in mind to finishing off the build with care and attention to detail; we could not fault the process.

The team was flexible and had excellent communication when it came to decision making and keeping us in the loop with the time line. We loved turning up each week to our site and seeing progress - our build was complete sooner than expected, making it a super stress free and exciting experience.

We cannot recommend Gareth Davis Builders enough - absolutely get them on board with your next project!

Tim & Brittany

Thinking Of Renovating?

We make it easy with our free renovation guide. We send it straight to your inbox!

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Make Your Home Energy Efficient
With A Green Home Loan

Make the most of these green loans when planning your extension. You may be able to access low-interest or interest-free Green Home Loans through major New Zealand banks including ANZ, Westpac, ASB, and BNZ to help fund energy-efficient upgrades to your home.

These loans can assist with improvements such as heat pumps, insulation, double glazing, ventilation systems, hot water upgrades, solar power, rainwater tanks, waterproofing, and more. This helps create a warmer, healthier, and more energy-efficient home. Depending on the bank, eligible homeowners may be able to borrow up to $80,000 at low or even 0% interest rates for a set period.

Love Where You Live?
Let's Create More Space!

Whether you’re still exploring ideas or ready to extend your home, as experienced extension builders, we are here to guide you through the process from planning to completion. With clear communication, careful project management, and quality craftsmanship, we’ll create a seamless home extension to suit your families needs. Get in touch to discuss your ideas, get expert advice, or request a quote.

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