We specialise in delivering high-quality first floor additions that transform your existing home into a more spacious, functional, and valuable property. Whether you’re looking to add extra bedrooms, a new master suite, a second living area. We offer a range of solutions designed to meet your needs for a complete upstairs extension. We manage the entire process from concept to completion.

Our service includes design consultation, structural assessment, council approvals, and full construction. We work closely with you to ensure the new level integrates seamlessly with your home’s existing style while meeting your lifestyle needs and budget.

With a strong focus on craftsmanship, safety, and attention to detail, we aim to minimise disruption during construction and deliver results that enhance both comfort and long-term property value.

Everything Add-Style does is tailored to help you move forward with clarity and confidence.

Getting started is simple. Reach out through our contact form or schedule a call—we’ll walk you through the next steps and answer any questions along the way.

What usually sets one first-floor addition builder apart from another comes down to how they handle the parts of the job that most homeowners don’t see until things go wrong. Here’s a clear way to think about the real differences:

A strong first-floor addition builder that has many years of experience specifically in adding second storeys—not just general home building. That matters because taking off a roof, integrating new structural loads, and tying old and new construction together is far more complex than building a new home from scratch. Builders without that focus often underestimate engineering and sequencing issues, which can lead to delays and cost blowouts.

Another key difference is how they manage design and approvals. We have an in-house design team and engineers from day one, so what we design is actually buildable within council rules. Less experienced operators often treat design and construction as separate steps, which can cause redesigns once approvals or engineering reality kicks in. Check out our brilliant designs on our Projects page.

Project management is also a major divider. Reliable addition builders coordinate trades tightly around a fixed schedule, especially because first-floor additions require the household to remain liveable during construction. Poor coordination here leads to long periods where the home feels like a construction site without meaningful progress.

Transparency in pricing is another important factor. Add-Style provides very detailed scopes that include allowances, structural work, and contingency planning upfront with a Fixed Price Contract. Other inexperienced Builders present a low initial price that expands later through variations once construction is underway. The difference shows up in final cost certainty.

Finally, communication and accountability matter more than people expect. At Add-Style Home Additions we assign a dedicated project manager who stays across the entire job and provides regular updates, rather than rotating staff or leaving homeowners chasing information.

In most cases, you do not need to move out during the construction of your first-floor addition.

Our build process has evolved over the last 39 years, allowing us to refine the way we deliver first-floor additions with minimal disruption.

We focus on keeping your home as liveable as possible throughout the construction period while ensuring the project progresses safely, efficiently, and to a high standard.

We offer flexible pricing based on project type and complexity.

After the design stage is complete, we’ll provide a transparent fixed price quotation that provides you cost certainty for the agree scope of works.

Yes—you can absolutely make changes during the design stage, and it’s actually the best time to do so.

During design, nothing is locked into construction yet, so adjustments can be made to layout, room sizes, structural elements, materials, and even the overall configuration of the first-floor addition. This stage is where your ideas are tested against practical constraints like structural feasibility, budget, and council requirements, so changes are not only allowed but expected as the design is refined.

The main benefit of making changes at this point is cost control. Alterations during design are relatively low-impact compared to making changes once construction has started, where they can lead to delays, rework, and additional costs.

Most builders and designers will go through a structured process—initial concept, revised design, and final construction drawings—specifically to allow you to review and adjust things along the way until everything is approved and ready to build.

Cost-plus contracts for residential additions can work well, but they’re also one of the more common sources of disputes if they’re not tightly managed.

A cost-plus arrangement means you pay the builder the actual cost of labor and materials plus a fee (fixed fee or percentage). The main “problem” isn’t the model itself—it’s how easily it can drift without strong controls.

Where problems typically show up

1. Budget uncertainty
The biggest issue is predictability. Unlike a fixed-price contract, the final cost isn’t known upfront, so homeowners can get uncomfortable as invoices accumulate—especially on renovations where surprises are common.

2. Weak cost control incentives (if structured poorly)
If the builder is paid a percentage of total cost, there can be a subtle incentive for costs to creep up (even unintentionally). Most reputable builders still act ethically, but the structure can create tension.

3. Lack of transparency or documentation
Disputes often come down to unclear or inconsistent:

• receipts and invoices

• time tracking

• subcontractor quotes

• what counts as “reimbursable cost”

If records aren’t clean, trust erodes quickly.

4. Change orders pile up
Residential additions almost always involve changes (hidden structural issues, design tweaks, council requirements in Australia). In cost-plus jobs, frequent changes can make it hard for homeowners to track the moving total.

5. “Scope creep”
Without a clearly defined scope and allowances, projects tend to expand naturally—bigger finishes, upgraded fixtures, extra work—leading to cost escalation.

You can reach us anytime via our contact page or email. We aim to respond quickly—usually within one business day.