A retaining wall project starts with the ground around it. Before choosing the finished look, consider the levels you want to create, how the space above and below the wall will be used, and how the work can be accessed.

Explain what the wall needs to achieve

Are you creating a level lawn, supporting a change in ground level or replacing an existing wall? Take photos from both sides and mark the proposed location on a site plan. Include an approximate length and any available level information, while leaving final dimensions to the agreed design.

Show what is nearby

Point out buildings, driveways, boundaries and sloping ground around the proposed wall. MBIE's retaining-wall guidance distinguishes between walls based on factors including retained height and additional loads. A height measurement alone does not settle the requirements for a particular site. Read MBIE's guidance on retaining walls and confirm the design and consent requirements for your project.

Include drainage in the discussion

Tell the designer and contractor about wet areas, existing drains and where water currently collects. Ask how drainage behind the wall and its discharge will be addressed in the design and quote. This needs to be considered alongside excavation and backfill, rather than left until the wall is finished.

Allow for excavation and access

The visible wall is only part of the job. Ask what is included for removing the old wall, excavation, cartage, bringing materials onto the property and reinstating disturbed areas. Photos of the access route are as useful as photos of the wall itself.

Agree on the handover

Clarify the finish at the top and bottom of the wall, the extent of backfill and which landscaping tasks follow. If fencing or other work is proposed near the wall, include it in the early design discussion.

NEXT can discuss the site preparation and construction scope with you. View our retaining wall services in Christchurch, or request a quote with your photos and plans.