How do you calculate the volume of a wall?

Multiply the wall's length by its height to get the face area, then multiply by the thickness to get volume — length x height x thickness, in consistent units, gives you cubic metres (or cubic feet/yards) of material.

How much concrete do I need for a boundary wall?

It depends entirely on the wall's length, height, and thickness. A 10m long, 2m high wall at a 0.2m thickness needs 4 m³ of raw material before waste — enter your own dimensions into the calculator above for an exact figure plus a waste allowance.

Do I need a permit for a boundary wall in Malta?

A Planning Authority permit is generally required for a new boundary wall, and party wall or shared-boundary works may also need agreement from the neighbouring owner. Check with the Planning Authority before starting any wall work.

Wall Volume & Cost Calculator — Poured or Block Wall Material Cost | Malta

How to Calculate Wall Volume and Material Cost

Whether you're pricing a poured-concrete boundary wall, a retaining wall, or a block/brick masonry wall, the first number you need is the volume (or unit count) of material it will take to build it. This calculator works both ways: for a solid poured wall, it multiplies length x height x thickness to get a volume in cubic metres; for a masonry-unit wall, it works out how many blocks or bricks you need from your wall size and unit dimensions. Either way, add a waste allowance and a material unit price, and you get a total estimated material cost for the wall.

How to Use the Wall Volume & Cost Calculator

Enter the wall's length and height — its finished face dimensions.
Choose your wall type: a poured/solid wall (enter a thickness) or a masonry-unit wall (enter block or brick size and mortar joint thickness).
Set a waste allowance — 5-10% is typical, to cover offcuts, breakages, and awkward corners.
Enter a material unit price for your country to see the total estimated cost alongside the volume or unit count.

The Wall Volume Formula

For a poured/solid wall, volume = length x height x thickness — a straightforward rectangular-prism calculation. That raw volume is then inflated by your waste percentage before being priced, since a small allowance for spillage and offcuts is standard practice.

Worked example: a wall 10m long, 2m high, and 0.2m thick has a raw volume of 10 x 2 x 0.2 = 4 m³. Add a 7.5% waste allowance: 4 x 1.075 = 4.3 m³ of material to order. Multiply that by your local material price per cubic metre to get a total estimated cost — see the worked cost example for your country below.

Pro Tips

Thickness has an outsized effect on cost, since it's a straight multiplier on volume — doubling wall thickness roughly doubles the material bill for the same length and height. Get a firm thickness recommendation for your soil, wall height, and local building rules before ordering, rather than guessing.

A material unit price only covers the raw material — batching, pumping, formwork (for a poured wall) or mortar and labour (for a masonry wall) are usually priced separately and can equal or exceed the material cost itself.

Using the worked example above — a 10m long, 2m high, 0.2m thick wall needing 4.3 m³ of material after 7.5% waste — at a typical Maltese price of around €95 per m³ of poured wall material, that comes to roughly €408.50 in material cost alone, before formwork, delivery, and labour. Walls built from dressed limestone blocks instead of poured concrete will price differently, since limestone is typically sold and priced per block rather than per cubic metre of poured material.