Black Tar Construction
“The quality of the work exceeded my expectations, and what really stood out was how thoroughly they cleaned up afterward, leaving the property neat and tidy.”
Best Retaining Wall Contractors in Carp, ON
24 companies listed · 4 in Carp · 2 open 24/7 · 13 open weekends · all 24 rated 4.5+
Data verified October 19, 2026
Killarney Landscaping
“Dan took the lead in designing our space so that it fits within its surroundings, and we are very pleased with the outcome.”
ALM Construction & Landscaping Inc.
“If you are looking for a fair priced high end contractor Lindsey and Rob are your go to contractors.”
L
“Leng came over and helped us with design and colors gave us a sameday detailed quote (on a Sunday).”
D'Agui Masonry Ottawa
“They were polite and professional, showed up bright and early, and finished much faster than I had expected.”
WLS Landscaping
“Josh and his team were fantastic from the initial quote all the way to the finished product.”
Listed for homeowners in and around Carp, ON, these 24 companies build and rebuild retaining walls. Wall types, materials and seasonal hours are what each company publishes for itself, and the ratings and quoted lines are drawn from public reviews.
Area overview: Carp, ON
4 of the 24 companies we list are based in Carp; the other 20 serve Carp from towns including Ottawa, Gatineau, QC and Nepean. The companies on this page are rated from 4.5 to 5.0 across 1,938 reviews; 11 have 50 or more reviews. When customers rate these companies on specific qualities, they most often praise professionalism (86%), quality (83%) and value (72%). The topics that come up most in reviews of the companies on this page are "communication", "estimates" and "efficient". 2 are open around the clock; 13 are open on Saturdays and 7 on Sundays. The services the companies on this page list most often on their websites are foundation crack repairs (2), interlock driveways (2), renovation (2) and retaining walls (2). 3 show a licence on their websites. 12 have ten or more years of experience, the longest 27 years. 2 offer emergency call-outs; 2 offer financing or payment plans; 14 give free estimates; 6 are family- or locally-owned and 1 lists coupons or special offers. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
Do these companies show photos of finished walls?
A website link sits on all 24 wall builders here. A photograph of a finished wall tells you very little, because everything that fails is behind the face. Look for pictures taken mid-build instead: the base trench, the drainage stone going in, the grid rolled out between courses. Ask to see a wall that has been standing through several winters.
WCI Paving
“I interviewed four companies and I can honestly say Kieran impressed me the most, at the beginning and throughout the whole process.”
Yards Unlimited Landscaping Inc.
“Their costs seem reasonable to me, given the level of work done, and the final results.”
Ardel Concrete Services
“He provided helpful insights on a crack in the foundation without exaggerating the issue, reassuring me that it was nothing to worry about.”
Keo-Can Landscaping & Renovations
“Throughout the design process Everett was responsive to our preferences by explaining what was possible but also advising us of fading issues, color perceptions, light and pattern effects, and the durability of the paver choices we considered”
Medusa Stoneworks
“The first time we had met I had a lot of questions as this was very new to me and he (Joe) took the time to explain all of my options in detail while answering all of my questions”
Blacktop Construction Inc
“Highly recommend Blacktop construction for any future projects you may have, outstanding experience dealing with this company !”
Coliseum Concrete & Interlock
“I wanna say thank you to Jonathan and his team in Ottawa for doing an above the par job on my stamped concrete walkway to our backyard!!”
Renco Home Improvements
“The whole process was smooth and efficient, and the final result turned out great.”
Shade Group Inc.
“The team understood what we were aiming for and helped improve our original plans.”
Cornerstone Brickworks Inc.
“They had is between a rock and a hard place and could have tried to gouge us, but their added cost to rebuild the chimney, replace the flu, and install a new metal cap was very reasonable”
Kavanagh Masonry
“We are having more work done from Kavanagh Masonry later this year because we were so pleased with the work and the service.”
J & S Paving
“They responded quickly, provided a fair and detailed quote, and communicated clearly throughout the entire process.”
Hardscape Ottawa
“The owner went above and beyond for me, bringing me extra rolls when I couldn't get some parts of the new lawn to properly take after I installed them.”
Construction Viking
“Its employees Dan and Ben, faithful to the post every morning with incredible punctuality and perfect work, are most courteous and hardworking.”
Platinum Guys
“The quality of work was excellent, and the team was professional and efficient.”
Top Rock
“A special thank you to Mario for his attention to detail, professionalism, and commitment to making sure everything was done right.”
WRC Contracting
“These guys and their crew did some great work at my home, pouring a front walkway and a concrete deck around my in ground pool.”
Kanata Concrete
“Service was above and beyond - and on short notice!”
Why these companies made our list
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