Every home extension and/or renovation is different, so the budget you'll need will depend on a range of factors unique to your project.

The size of the project is certainly one consideration, but it's far from the only one. Style and construction of your existing home, the slope of your land, site access, the level of finish you choose and the type of work involved will all influence the final cost. For example, adding a bathroom as part of an extension or renovation will generally cost more than creating a larger living area because it requires additional plumbing, waterproofing, electrical work and specialised trades.

While it's impossible to provide an exact figure without more information, we can usually give you a realistic ballpark estimate over the phone based on what you've told us and our experience delivering home extensions and renovations across Auckland and Hamilton. That initial conversation is designed to help you understand what's realistically achievable within your budget. We'll answer your questions, talk through your ideas and provide an honest ballpark estimate so you can decide whether or not to move forward with your project.

The honest answer is that it depends, but for most people the decision comes down to their answer to one question do you still love where you live?

If you've outgrown your home but still love your neighbourhood, school zone, commute and the community around you, extending and renovating can often be a better option than moving. It allows you to create a home designed around the way your family lives, without giving up everything you already love about where you are.

When people think about moving, they often focus on gaining more space, but it's easy to overlook what they might be leaving behind: the location, the garden, the neighbours, the lifestyle and the things that made you choose your current home in the first place. Of course, renovating isn't always the right answer. If your location no longer suits your lifestyle, you're wanting a different area or your current home simply cannot achieve what you need, moving may be the better option.

Our role isn't to convince you to renovate at all costs. It's to help you understand your options and make the decision that's right for you. If extending and renovating is the right choice, we'll help you create a home that works better for the way you want to live.

In most cases, absolutely.

Because we specialise in home extensions and renovations, we're very experienced at working around families who choose to remain in their homes throughout construction. With good planning, clear communication and dedicated living and construction zones, it's often much easier than people expect.

While there are times when temporary arrangements may need to be made, particularly if work affects your kitchen or bathroom, we'll discuss these with you well in advance so there are no surprises. The goal is always to minimise disruption and keep your home as functional as possible throughout the build.

Some builders will recommend moving out because it can make construction easier for them. Our approach is different. We understand that most homeowners would rather stay in the home they love, so we do everything we reasonably can to make that possible. Our goal isn't just to build you a beautiful home extension and/or renovation. It's to make the journey there as smooth and stress-free as possible.

The first step is simply getting in touch.

You can either fill out our contact form or give our team a call, and we'll have a conversation about your ideas, your home and what you're hoping to achieve.
From there, we'll arrange a time to come and meet with you at your home. We often describe this first meeting as a bit like a first date. It's an opportunity for you to get to know us, understand how we work and ask any questions you may have, while we get to know you, your goals and what you're looking to achieve from your home extension and/or renovation.

At the end of that conversation, we'll both have a better understanding of whether we're the right fit to work together. If we are, we'll guide you through the next steps and help turn your ideas into a clear plan for your project.

Building a relationship based on trust is important to us because your home extension and/or renovation is a significant investment. We want you to feel confident not only in the finished result, but also in the people you have chosen to help you get there.

The honest answer is that it depends on the size and complexity of your project. A straightforward renovation may take significantly less time, while larger home extensions, structural renovations and projects requiring detailed design and council approvals can take 12 to 18 months from your first conversation with us through to completion.

It’s important to understand that the construction phase is only one part of the journey. Before work can begin, there is often a lot happening behind the scenes, including understanding what you want to achieve, developing the design, preparing detailed pricing, completing any required engineering and working through council approvals.

Taking the time to properly plan before construction begins helps create a smoother build. It allows important decisions to be made when they are still easier to change, helps identify potential challenges early and gives everyone a clearer understanding of what is involved before work starts.

Once construction begins, we’ll provide a realistic timeframe for your specific project and keep you updated throughout the build, so you always know what is happening and what comes next.

Every project is different, but our focus is always on taking the right amount of time to plan properly, build carefully and deliver a finished home that works for the way you want to live.

In most cases, home extensions and significant renovations will require Building Consent. Depending on your property and the scope of your project, you may also need Resource Consent. This is more common if your home is in a heritage area, you're close to your boundaries, your property is affected by planning constraints or your project doesn't comply with the Auckland or Hamilton district plan.

The good news is that you don't need to work this out yourself. During our first meeting, we'll discuss your ideas, identify which approvals are likely to be required and explain the process in plain English, so you know exactly what to expect.

If consent is required, we'll manage the process for you from start to finish, working alongside the designer, council and any consultants needed to help keep your project moving. Our goal is to remove as much of the complexity as possible, so you can focus on the exciting parts of planning your home extension and/or renovation.

Yes.

Once your concepts have been finalised and the required documentation has been completed, we'll prepare a fixed-price proposal that clearly outlines exactly what's included, along with any exclusions, so everyone has a clear understanding of the project before construction begins.
We put a significant amount of time into preparing our fixed-price proposals because we believe the more time and effort invested upfront, the fewer surprises there are later. Our detailed cost indication process allows us to price your project as accurately as possible, giving you confidence that you're making informed decisions before committing to construction.

A fixed-price proposal provides certainty. Rather than relying on assumptions or rough estimates, you'll know exactly what you're getting, what it's expected to cost and what's included before any work begins. We believe that clarity upfront leads to a smoother, more enjoyable home extension and/or renovation for everyone involved.

That's actually one of the best times to get in touch.

Many people assume they need plans drawn, a clear idea of exactly what they want or a construction start date before speaking to a builder. In reality, most people we meet are still exploring ideas and trying to understand what is possible.

Our role at this early stage is to help you understand your options, talk through your ideas and work out what makes sense for your home, lifestyle and budget. You don't need to have all the answers. That's exactly what we're here to help with.

It's also worth understanding that a home extension or renovation is not something that happens overnight. From your first conversation through to construction beginning is often around 6 months or longer, depending on the complexity of the project, design requirements and council approvals.

Taking the time to plan properly upfront helps avoid costly changes later and creates a smoother building experience. After completing more than 230 extension and renovation projects, we've seen that there is often more than one way to achieve the outcome you're looking for. Our job is to help you find the option that best suits your home.

Yes — we provide end-to-end project management, from shaping your ideas and connecting you with the right designer, through consenting, and right through construction to completion.

Absolutely. We’ll introduce you to one of our carefully chosen architectural design companies so your home is designed around your lifestyle, needs, and budget.

We build a detailed scope and involve key sub-trades early, then review quotes to make sure nothing is missing — so the fixed-price figure is based on real, checked costs (not guesswork). 

Your fixed price won’t change unless you change your mind. If something genuinely unforeseen comes up, you’ll receive a written variation so you stay in control of costs.

During construction your build is checked against a rigorous quality-control checklist, and a final walkthrough is completed before handover to ensure nothing is missed.

Yes — Certified Home Extensions are members of the New Zealand Certified Builders Association, and your project is backed by a comprehensive 10-year residential building guarantee.