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cooligan carpentry

Specializing in septic systems, barging and construction

Proudly serving the Big Rideau and Rideau Lakes area


Based out of Harlem, Ontario, we service the Big Rideau and Rideau Lakes area.


We pride ourselves in a job well done every time.  Professional, quality builds and installation guaranteed.

What We Do


Septic Systems

Service for mainland or water-access septic needs.

  • Filter beds
  • Conventional beds
  • Tertiary systems
  • Waterloo Biofilter certified installer

Barge Services

Barging to island properties or mainland properties with limited vehicle access.

  • Aggregates
  • Lumber
  • Island or property clean up
  • and more...


Whatever your vision is - we can bring it to life.

  • Renovations
  • Docks
  • Decks
  • Boathouses
  • Shoreline work
  • and more...

Featured work


Let’s work together

We'd love to take care of your construction or septic needs.  Drop us a quick email to let us know what kind of service you are looking for. We'll get in touch to set an appointment to view the site and provide a quote.