Adelaide's premier underpinning, renovation, and new build specialists!

We are a South Australian family-owned and run business here to help see your projects right through from dream, to concept and design, and completion.
Underpinning experts using methods that stand the test of time, and specialist builders that provide bespoke and custom new builds and renovations, we can do it all!


Experts at underpinning in Adelaide, our team of experienced underpinners, earthmovers, and labourers will secure the footings of your most valuable asset, be it home or business, bringing it back to its former glory using quality workmanship that stands the test of time, and for a fair price.


Providing top quality renovations and additions in Adelaide, we are a team of qualified builders, carpenters, electricians, earthmovers, and labourers that specialise in providing renovations to cover a range of architectural styles while using a wide variety of materials to make your dream home a reality.

Decks and Pergolas

Is it time to consider upgrading your home (and its value) with a stylish new deck and pergola? Let us help you create the perfect outdoor sanctuary for you and your family. Whether your outdoor space is small or large, there is a way to make the most of the area you have, and to a budget that suits your requirements.


For roof repairs and replacements, allenCO construction stands by our workmanship to provide lasting shelter and protection of your home or business that will stand the test of time.

Exensions and Additions

Our expert team of quialified builders and trades specialise in extensions and additions to existing homes and buildings covering a range of architectural styles, using quality materials and finished to a standard people have come to know and trust.

We have more than twenty five years of experience.
We specialise in Underpinning, Renovations and New Builds.


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Tiled front porch and black painted front door of a heritage home.

Cost of underpinning a house in Adelaide

The cost of underpinning a house varies greatly with the method chosen to rectify the issues with your foundation. But how do you know if your home needs underpinning?

The before and after transformation of a renovation

Creating a Budget for your Renovation

Renovations can be expensive or cheap, large or small. We all know budgeting for a renovation is important, but how do you create a budget without knowing what many of the basics are going to cost?

Outdoor entertaining area with timber decking and timber furniture with a white hamptons style house

Top 5 Trends in Outdoor Living

  With 2021 seeing us all spend a lot more time at home it gives us time to reflect on our homes and our lifestyles. During this time you may have considered giving your home a much-needed revamp. A simple yet effective way to lift and extend the liveability of your home is to makeover…

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