Retaining Walls

Designing terraced-landscape-accents opens a world of possibilities by establishing interesting elevations for your eyes to alternate between.

Retaining walls have the practical application of alleviating sloping therefore creating more useable yard space. A sloped yard is always filled with potential and using retaining walls can capitalize on this by creating different levels, like tiers to a deck, or by showcasing beautiful foliage.


  • The coping on the wall has been attached using an adhesive; it is possible that adhesive did not stick correctly and the stone coping can become loose. Should this happen; simply lift the coping unit, ensure the surface is clean, then apply an adhesive (we recommend Bulldog PL Premium).
  • Cleaning can be done with a pressure washer and if needed; soap or any other concrete cleaner can be used. If efflorescence appears, and is not easily washed off, there are efflorescence specific cleaners available.
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  • A five-year workmanship warranty exists on hardscaping construction performed by Greentree. This excludes poured concrete walls.
  • Retaining walls that have sunk due to compaction or movement will be covered for repair a maximum of two times during the five-year period.
  • Settling that occurs below one foot of subgrade will not be covered by warranty.
  • A one-year warranty exists on poured concrete walls for any cracking that occurs outside of the expansion joints; cracks will be filled and sealed.
  • Greentree is not liable for any chipping, discolouration, and/or disfiguration of material that may occur after installation. This includes damage from de-icing salts or other products administered.

Frequently Asked Questions

  • Q: Does my retaining wall require a permit?
    A: We recommend checking with your local building authority to see if you require a permit for your retaining wall. If requested, Greentree can assist you in obtaining any necessary permits.
  • Q: What is the white residue on my retaining wall?
    A: This is known as Efflorescence, it is the process of dissolving an internally held salt in water. The water, with the salt now dissolved in it, migrates to the surface where the water evaporates leaving only the salt.
  • Q: Why do I see the tops of retaining wall blocks on my wall?
    A: As the square block goes around a curve, some overlap is required.
  • Q: Are retaining walls built straight up and down?
    A: No, to increase the strength walls are typically leaning slightly back into the soil they are retaining. This is particularly noticeable when a wall meets a straight vertical surface, like the corner of a house.
  • Q: What will be the height of each stair rise in my retaining wall?
    A: This depends on the size of retaining wall block chosen to build the wall.
  • Q: Will my retaining wall be engineered?
    A: Most retaining walls do not require an engineer to stamp the plan prior to construction. There are three main reasons an Engineers stamp may be recommended. Firstly, if the wall is going to have a large load (like a car) within 5’ of the edge of the wall. Secondly, if the retaining wall height is above 6’ tall from the final grade elevation, to the bottom of the coping. Lastly, local building code may require an Engineers stamp.