How to Build a Garden Wall

Planning and Planning Permission

Walls up to 1 metre high in most locations do not require planning permission. Walls adjacent to a highway are limited to 1 metre without permission. Listed buildings and conservation areas have additional restrictions. Always check with your local council for boundary walls.

Foundations

A garden wall needs a concrete foundation (footing) to prevent movement and cracking. Depth: minimum 400mm for walls up to 1m high. Width: minimum 3x the wall width. Mix concrete at 1:3:6 (cement:sharp sand:aggregate) or use ready-mix. Allow to cure for 3–7 days before building.

Choosing Materials

Engineering bricks: most durable for garden walls, resistant to frost and moisture. Facing bricks: decorative, wide choice of colours, used where appearance matters. Concrete blocks: cheaper, used for walls to be rendered or built in non-visible areas. All garden wall bricks must be frost-resistant (Class F).

Mixing Mortar

Use a 3:1 mix (3 parts soft sand to 1 part cement) for bricklaying mortar. Mix to a smooth, workable consistency — not too wet (slumps off the trowel) or too dry (crumbles). A pointing mortar of 4:1 is better for joints.

Laying Bricks

Lay a bed of mortar on the foundation. Place the first brick, level and plumb. Butter the end of each subsequent brick and push against the previous one, maintaining a 10mm joint. Check level and plumb every course. Stagger vertical joints (bonding).

Finishing and Coping

Apply mortar to joints using a pointing iron or jointing bar. Flush, weather, or bucket handle joints are most common. Fit coping stones or engineering bricks on edge as a cap course — this prevents water ingress and significantly extends wall life.