Should I get an architect for my home extension or second-storey addition?

You don’t need to start with an architect. In fact, jumping straight into design without builder input often leads to plans that completely blow your budget. This happens more often than you’d think—and too many projects stall or get abandoned because of it.

The smarter way? Involve a builder from the start.

With a builder in the loop early, your design stays grounded in what’s actually doable and affordable. That’s why Amerex offers an integrated design and build service—so your project is shaped by both vision and real-world costs from day one. You get a design that looks great, works structurally and fits your budget.

How much should I budget for my Perth renovation, extension, second storey addition?

Here is some realistic cost estimates based on recent projects completed by Amerex Renovations:

Home Extensions: These projects are typically $300k to $500k+ depending on size, number of wet areas, features and selections etc…

Second Storey Additions: These start around $380k and if the project scope includes major ground floor renovations, the price can increase upwards. Typical Amerex second storey additions usually sit somewhere between $550k and $750k, though we are increasingly taking in projects with a contract value of $1m+.

Top-to-Toe Renovations: These comprehensive renovations begin at $350,000 and include new kitchen, bathroom, laundry, lighting, flooring and more. If structural changes such as relocating the kitchen or a re-roof is required, the price will increase accordingly.

How long will my renovation take?

Typically, top-to-toe renovations take around 4 to 6 months while projects with structural work such as rear home extensions and second storey additions take 6 to 12 months once the construction stage commences.

There are many variables that can affect the duration of the project such as size, complexity and whether your project is being completed in stages to allow you to remain living in the home.

You will also need to factor in the pre-construction stages which include design, council approvals and selecting your fixtures and fittings (we provide an Interior Designer to help you with this) which all take place prior to the construction stage commencing.

We provide you with a more accurate timeframe once we have performed the detailed stage of project planning. We use construction specific software customised to our processes to develop your project schedule.

Can I live in my home during the renovation?

Yes, some of our clients choose to stay in their home during the renovation—and with the right planning, it can work. While there will be some disruption, we take proactive steps to minimise the impact. For example, we can install temporary hoarding to separate construction areas from your living areas, helping to contain dust and noise. We can also create safe zones for pets and can set up temporary kitchens or laundry areas if required.

If you remain living in the home, you will need to understand that there will be some noise, especially while we are undertaking structural works. We will keep you informed every step of the way and work with you to ensure your living conditions are as comfortable as possible.

We know and understand the challenge of securing a rental in the current market—and the added cost it brings. That’s why we do our best to make staying at home a viable option for as many clients as possible.

Is it better to move out during the renovation?

Moving out is recommended for some types of projects. If you have small children it is definitely recommended.

There are some key advantages to moving out while your renovation is in progress, these include:

It speeds up the construction timeline without the need to work around your family and create temporary facilities.

It is safer, especially with children or pets in the home.

Less exposure to noise, dust and the disruption of trades and suppliers coming and going.

If your renovation involves major structural changes, or you’re losing access to essential spaces like your kitchen or bathroom for long periods, moving out can be more convenient.

If living at home during the renovation is a viable/preferred option, we will work together with you to minimise disruption by cordoning off construction areas and creating temporary facilities when needed.

Not sure what is best for you? Talk to us. We can help you weigh up the best approach for your situation during the planning phase.

What should be included in a building contract?

At Amerex, we use a tried-and-tested, industry-standard building contract provided by the HIA. It’s fair to both parties, has all required inclusions with no hidden surprises—giving you confidence and peace of mind every step of the way. Accompanying the standard contract is the Contract Addenda which is the detailed specification of your project outlining trades and materials related to your project.

Want to see a sample contract? We’re happy to walk you through it.

What is the Amerex point of difference?

We don’t just renovate homes—we set the benchmark for renovation excellence in WA.

Amerex is the only renovation company to have won the HIA WA Professional Small Builder/Renovator of the Year award an incredible six times. That’s not by chance. It’s recognition of our systems, proven processes and professional approach that consistently delivers outstanding results.

We are a ‘one-stop shop’ where the designer and builder work together from the start to ensure your project stays aligned with your goals and budget—no surprises, no disconnects.

With over 30 year’s as a local Perth builder, Amerex has extensive expertise with character home renovations, second-storey additions, home extensions and our signature Top-to-toe Renovations. Our reputation has been built on integrity, genuine customer service and consistently delivering beautiful renovation projects – on time and on budget. We offer more than just a renovation—we offer peace of mind.

That’s the Amerex difference.

What kind of warranty and guarantee does Amerex provide?

Amerex offers a 12-month maintenance guarantee—6 to 8 months more than the industry standard. That means for an entire year after completion, we’re here to fix any non-structural defects that may arise. It gives you peace of mind knowing that your builder is still with you well after the project wraps up.

In addition to this, every project comes with a 6-year structural warranty, giving you long-term protection and confidence in the quality of your renovation.

Can you provide an overview of the renovation process?

We follow a clear, structured process to take your renovation from idea to reality, efficiently and professionally:

Design Concept Phase
We start by understanding your goals, measuring your site, and preparing concept drawings. These are reviewed and refined based on your feedback.
Cost Planning
Once the design is on track and you are 100% happy to proceed, we prepare a detailed quote.
Planning & Approvals
This stage includes working drawings, engineering, energy certification and submitting applications for planning and building approvals.
Pre-Construction Preparation
During this phase, we finalise contract documentation and assist with selecting fixtures and finishes through our interior designer. We also prepare a detailed construction schedule.
Site Start & Build
After approvals are received, we hold a site start-up meeting and commence construction. Our team manages the entire build with regular updates and a focus on quality from start to finish.

Each step is designed to keep your project moving forward with clarity, control and confidence.

How soon can you start my renovation?

Every project is different, so the start date depends on the complexity of the design, required approvals, and your own decision-making pace. The process begins with design and planning, including site measures, concept drawings, costing, and securing approvals—all essential steps before we can start on site.

Once your building permit is in place, we’re ready to schedule your construction as soon as possible. We provide a detailed timeline so you know exactly what to expect and when. Our goal is always to start promptly—without compromising on preparation or quality.

If you’re ready to begin, the best first step is to reach out and talk to us. We can guide you through the next steps and give you a better sense of timing based on your project.

Do I need council approval for a renovation or second storey addition?

Yes, most home extensions and second storey additions in Perth require planning and/or building approvals. But you don’t need to navigate this alone—we manage the entire process for you. From preparing the right drawings and documentation to lodging applications and liaising with the council, we take care of the details. That means fewer delays and more confidence at every step.

Can you help with design as well as building?

Absolutely. Amerex offers a fully integrated design and build service. This means your designer and builder are on the same team from day one—collaborating closely to bring your vision to life, while keeping your budget and timelines in mind. It’s a seamless process that avoids disconnects and helps ensure the design is practical, buildable, and tailored to your needs.

What factors influence the cost of a renovation?

Many factors shape the overall cost of your renovation, including:

Overall Size and complexity of the project
Number of wet areas – bathrooms, laundry, kitchen.
Quality of materials and finishes
Structural changes – such as removing walls/windows, roof changes.
Existing property condition – For example, older homes may require electrical re-wiring to bring up to standard, plumbing improvements and asbestos removal.
Site conditions – access for trades, site bins, sloping blocks and other site variables can make the project more difficult and require more labour or equipment such as cranes which can add to the cost.

We guide you through each of these decisions and provide a detailed estimate early in the process—so you understand where your budget is going.

Can you stage a renovation to help manage costs or disruption?

We don’t typically stage renovations to reduce costs—because doing everything in one go is generally more cost-effective. However, we do stage renovations when it helps improve livability during construction.

For example, if you’re staying in your home while we renovate, we may complete one bathroom before starting another, so you always have access to essential facilities. This type of staging can add some cost due to extra logistics, but it also reduces the need to move out or rent elsewhere—offering convenience and flexibility during your build.

If you’re considering living at home throughout your renovation, we’ll work with you to find the best balance between budget, timing and comfort.

Do you offer sustainable or environmentally friendly renovation options?

Yes. At Amerex, sustainability isn’t just a trend—it’s part of how we design and build. We’re committed to minimising environmental impact and helping our clients make informed, responsible choices.

Our sustainability practices include:

Recycled and salvaged materials: Where feasible, we can reuse materials such as jarrah floorboards, and relocate windows and doors to reduce waste and preserve character.
Energy-efficient upgrades: We use insulation such as R4.0 ceiling batts and EPS foam cladding with acrylic render for improved thermal performance.
Passive solar design: We consider orientation, natural light, and airflow to reduce reliance on artificial heating and cooling.
Responsible waste management: Construction waste is sorted and disposed of with care to minimise landfill.

If sustainability is a priority for your renovation, we’ll work with you to make smart choices that are both eco-conscious and high-quality.

Helpful Info / Your Renovation questions answered