Extensions & Alterations

Sometimes it's simply not practical or economical to build from scratch, and a large amount of our work revolves around extending and altering existing buldings.

We provide full site-management, including management of existing contractors, and will reuse existing building materials wherever possible to reduce costs.

We can also can put you in touch with qualified architects and engineers if you need recommendations.

If on-site construction is problematic, Rosier Constructions can build extensions off-site at our workshop, and then transport and integrate them into your existing building.

We understand that plans can change once you see how an alteration or material looks, and if additional costs will be incurred we'll always let you know up front. That way you can make an informed decision and won't get any unexpected surprises in your final bill.


Our capabilities

Rosier has a proven record of managing projects as head building contractors. We use a range of materials and techniques to create buildings that are beautiful and functional, and will reuse / recycle existing building materials wherever possible to help minimise the cost and environmental impact of the project.

Rosier always quotes a guaranteed maximum price with no variations (unless the client chooses to change the scope of the project after it has started). We take pride in our consistent track-record of completing projects within the timeframes and budget specified, with extensions requested only when poor weather makes construction impossible.


We have long-term relationships with developers and many of our clients, with repeat business making up a significant part of our work. We believe one of the reasons we get so much repeat work is because our clients recognise that we do the best job with the budget available.

But don't just take our word for it! See what some of our lovely clients have to say about working with us.

Contact us

If you require extensions or alterations please get in touch. We have proven tender and quote processes in place, and are always happy to provide detailed breakdowns of costs and timeframes.

Phone Toni Rosier on (03) 6339 1088 or email us.