Retaining Walls

Retaining walls can be used as an optional design choice creating raised terraces, gardens, flower beds and borders.  In some landscape designs, it is required in order to deal with slopes and other grading issues. 

Make a Bold Statement With Elevation

Retaining walls made from stone are an incredible way to create dramatic changes in elevation in your yard. 

Retaining Wall Construction

Retaining walls can be made from lots of different materials like garden wall blocks, interlock, armour stone, bricks, and railroad ties.  We believe that stone and interlock brick are the best materials for building retaining walls because of their strength against weathering.  For most residential and commercial retaining walls a simple gravity wall is all that’s required.  Gravity walls use heavy material to resist the pressure holding back the soil.  All retaining walls require proper drainage to ensure a long lasting and high quality finish that protects your landscape from erosion. 


Want To Include A Knee Wall or Armour Stone Retaining Wall in Your Landscape Design? Book a FREE in-home consultation today.

When Should A Retaining Wall Be Considered?

Create Useable Land For Your Design

In some cases, a retaining wall is required to level the area if you have a sloping yard.  Creating level terraces using walls has been done for centuries.  Making a useable landscape design is far easier when working with a flat surface.  Even a minor slope can limit your design options – but a minor slope would only require a small retaining wall.  Many customers are unaware of grading issues when it comes to landscape design.  One of the biggest advantages of meeting with our designer in-home is that we can identify potential grading problems and show you how to spot them.  

Incorporate Features

Retaining walls can be designed so the home-owner can install a flower bed that holds back soil and mulch.  Retaining walls offer a great solution to separate adjoining areas like entrances and driveways.  Retaining walls are a great design choice that defines boundaries, add style and provide amazing extra seating that your guests will love when visiting your newly renovated yard.


Combat Erosion & Manage Water

Eroding soil can destroy a landscape design.  By decreasing the slope of the property, using a physical structure and by installing proper drainage erosion can be prevented.  A&Z Interlock can provide valuable experience when it comes to advising and constructing home-owners when retaining walls are necessary. 

Does A Retaining Wall Require A Permit In Ottawa?

A&Z Interlock customers can rest assured knowing that we take care of any necessary permits and applications before starting a project.  Any retaining wall above 1.2 metres (3.9 feet) require a permit be obtained.  Our work is inspected by a civil engineer who certifies the safety of the wall. In landscape designs that have terraces, a permit is not required as long as the distance between each level is twice as long as the height. 

How Do You Build A Retaining Wall?

Step 1

Excavate & Prepare The Base Layer

Our construction crew outlines the area where your retaining wall is going to be built.  Depending on the size of your wall, we excavate a depth of anywhere from 6 to 12 inches.  We fill the excavated area with crushed stone and compact it to the desired compression.  This gives us an even foundation to build on top of. 

Step 2

Construct The Wall

Now that we have a solid foundation we can start building.  We place each stone individually and are continually checking if the wall is level.  A small problem with uneven layers only gets worse as the wall grows.  We choose stones that fit in an aesthetic way kind of like how one would match tiles when laying an indoor floor. 

Step 3

Install The Coping

Coping is the decorative finishing layer of bricks that goes on the top of your retaining wall.  to save money and to increase structure, interior bricks are designed differently since they won’t ever be seen. The caps of the retaining wall add style and match the rest of your landscape design. 

Step 4

Finishing Elements

Depending on the size, an inspection of the wall is scheduled to ensure it is structurally sound and safe.  Once completed we can install other elements like decorative borders, adjacent interlock patio, sod, or gardens.

Landscaping Services

Pool Landscaping

Renovating your pool doesn't have to be difficult. Choose your design and we take care of all the heavy lifting.

Interlock Driveways

Customize your driveway by choosing brick style and color with your choice of tesselation pattern. Choose the zero maintenance product that outlasts and asphalt product by decades.


Including a deck with your landscaping in Ottawa provides a place to sit with the family and barbecue, and seamlessly extends the living space of your home.

Interlock Patio

Customized to your style, design and size and A&Z Interlock patio can be as big or as small as you want it. Choose your Ottawa patio stones, color, size, shape, and pattern - we take care of the rest.

Retaining Walls

When working with sloped yards, retaining walls can be decorative & functional. Create tiered landscaping or level the grade with a paver or armor stone retaining wall.

Steps & Entrances

Come home every day to an amazing front entrance complete with steps, a patio, and gardens. Customize your walkway and front entrance with our landscape design team.

Landscape Design

A great yard starts with a good design. Our process involves an in-home consultation and uses computer-generated designs to help your vision become a reality.

Retaining Wall Resources

To learn about changes in permit requirements and other local Ottawa landscape news make sure to read the A&Z Interlock News below.

Why choose interlock for your Ottawa patio

Why choose interlock for your Ottawa patio

If you are thinking about building a patio or renovating the current one, selecting the suitable Ottawa interlock pavers for your home can make all the difference between ordinary and spectacular.   What are Ottawa interlock pavers? Interlocking pavers are the...

Why you should add a stone fire pit to our yard?

Why you should add a stone fire pit to our yard?

More and more people are adding fire pits to their outdoor living areas when doing a renovation for their landscaping in Ottawa. It is the perfect place for family and friends to gather for some warm beverages and great conversation. An outdoor stone fire pit in the...

Hardscape vs Softscape: what’s the difference?

Hardscape vs Softscape: what’s the difference?

When working with your Ottawa landscaping contractor, it is good to have some terms under your belt so that you can better understand the design plan and the estimate you will be given. A basic tenet is hardscape and softscape. They are complete opposites, but both...

Retaining Walls We Built In Ottawa

Most client designs focus is on knee walls for gardens and raised terraces to work with grading issues.  We do have some very interesting and impressive walls build from armour stone. 

Free In-Home Landscape Design Consultation

Set an appointment with one of our landscape designers and tell them your vision for your landscape project. Or let them share their years of experience and help you make the best decisions for your space, style, and budget.

Great landscape designs change over time. Meeting you is an opportunity for our team to better understand your needs and expectations.

We really look forward to meeting you and hearing you and hearing what you had in mind in your outdoor living space. 


A great design should suit your style and personality. By meeting our designer can better understand the goals of your yard.  Are you trying to keep a low maintenance are or create harmony between indoor & outdoor space?


Landscaping estimates are calculated using square footage of the yard. It is very important the measurements are precise and accurate to deliver better designs and value to our customers. 


Not sure if your yard is big enough for a radial interlock patio?  Got questions on how to extend your budget to include a luxury feature.  Our years of experience and product knowledge helps our clients get the outdoor living space they are dreaming of.

Contact Us

Fill in the form and we will get in touch with you. Questions, comments and landscape inquiries are always welcomed and we try to respond as fast as possible. For immediate assistance call our customer service phone number or email us directly.

(613) 219-9862


I am:(Required)


A&Z Interlock provides professional landscape construction and design services to residential homeowners in the Ottawa Ontario area. Watch your home transformed as we turn your yard into the patio you always dreamed of. Since 2005 Ottawa landscaping clients have been delighted with our service, warranty, and after-sales care.
Book your next renovation with Ottawa's premier landscape contractor today.

Privacy Policy

A&Z Interlock Design and Build BBB Business Review

Contact Us

A&Z Interlock Design & Build
2014 Calypso Street
Ottawa, Ontario

(613) 219-9862