allenCO construction - Award winning underpinners and foundation repair specialists

Adelaide's premier underpinning, foundation repair, renovation, and extension specialists!

Winners of the 2023 Master Builders Australia National Business Excellence Awards for “Small Residential Building Company – Annual Turnover under $5M”, we are a South Australian family-owned and run business specialising in underpinning, foundation repair, renovations, extensions, and additions for both residential and commercial properties across metropolitan and regional South Australia.

Underpinning Adelaide 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.

Exensions and Additions

Our expert team of qualified 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, Foundation Repair, Renovations and Extensions


Request a Quote

A picket fence gate for a home with signage for award winners allenCO construction.

Award Winners – Business Excellence Awards

We’re Award Winners! The next steps allenCO Construction are pround to announce we’re award winners for “Small Residential Building Company – Annual Turnover under $5M” at the 2023 Master Builders Australia National Business Excellence Awards.

Image showing 4 allenCO construction team members and a logo for an award nomination.

Finalists in the 2023 Master Builders Association National Business Excellence Awards

In an exciting and pivotal moment for allenCO Construction, we are thrilled to announce that we have been named a finalist in the prestigious 2023 Master Builders Association National Business Excellence Awards.

Commercial underpinning work showing the supports of a wall in an underground carpark to stop it from collapsing.

Commercial Underpinning in Adelaide

  When it comes to safeguarding the stability and longevity of your commercial property, the concept of commercial underpinning takes center stage. At allenCO Construction, we specialise in the art of strengthening, elevating, and sustaining settling foundations. Notice: JavaScript is required for this content.

Get a Quote