Gardening Box – Quantity Surveying

Card number 2 in The Hamlyn Gardening Cards box. 
There are simple ways of estimating quantities of various materials required – and of the plants needed. 

Paving slabs are usually sold by the area they will cover. Measure the length and breadth of each path and multiply the figures to get the area. Natural paving stone is generally sold by square yard and varies in thickness and price accordingly. Precast paving may be purchased by the square yard, foot or by the individual unit. 

Bricks are sold by numbers. Thirty-five laid flat or fifty-three laid on edge will cover an area of 10sq. ft., approximately. 

Ready mixed concrete is ordered in cubic yards. A path 3 in. deep, 3 ft. wide and 36 ft. long will require one cubic yard. Gravel for paths and drives is usually sold by the ‘yard’, which means a ‘cubic yard’. If spread 2 in. thick a cubic yard will cover 18 sq. yd.

Annuals spaced at 6-in. centres will require four plants for each sq. ft. of bed. Perennials spaced at 1 ft. 6 in. centres will require four plants for each sq. yd. of bed. 

Turf is sold as individual turves, each 1 ft. by 1 ft., or in rolls of 1 ft. width and varying lengths. 

Soil is sold by the cubic yard or ton (about the same). One ton will raise a bed of approximately 100 sq. ft. by about 3 in. 


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