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Urban Redevelopment Authority (URA)

Retaining and Boundary Walls

Check the guidelines relating to retaining and boundary walls for semi-detached houses.

Last updated on 7 June 2026
Silhouette of a person near a tiered wall structure showing a retaining wall up to 1m and a boundary wall up to 1.8m, total height 2.8m.

Height of Retaining and Boundary Walls

Retaining Walls

Outward facing retaining walls are not encouraged as they tend to mar the streetscape. If allowed, retaining walls shall:

  • Not be more than 1m high. Retaining walls more than 1m high may be considered along the common boundaries and shall be suitably tiered and planted with adequate greenery if alternative measures are impractical.

  • Be terraced at minimum 300mm apart, and planted to give an adequate greenery effect, if fronting a road or street.

Boundary Walls

Boundary walls shall not exceed 1.8m high.

The combined height of retaining and boundary wall shall not exceed 2.8m, of which a solid wall shall not exceed 1.8m. Where a boundary wall is proposed on top of the retaining wall, only porous material (e.g. fencing) shall be used for the boundary wall.

The height of the common boundary wall abutting the car porch/patio area of semi-detached houses may be allowed up to the 1st storey ceiling height.