Aggregates
Hardcore, pea gravel, coarse aggregate, all-in ballast, and blinding concrete are the bulk groundwork materials that arrive on tipper lorries and form the base layer under every foundation, slab, and drainage run.
All-In Ballast: The Pre-Blended Aggregate for Site-Mixed Concrete
The definitive UK guide to all-in ballast: BS EN 12620 spec, the right cement:ballast ratio, bulk bag vs loose load pricing, and the foundation mix mistake to avoid.
Blinding Concrete: The 50mm Layer That Halves Your Reinforcement Cover
C8/10 GEN 1 blinding concrete costs £96 – £138 per m³. The 50-75mm layer that turns a hardcore subbase into a working surface and cuts cover from 75mm to 40mm.
Coarse Aggregate (20mm Gravel): The Stone for Site-Mixed Concrete
UK guide to 20mm coarse aggregate: how it differs from all-in ballast, mix ratios, quantities, and when site-mixing beats ready-mix at £59 – £75 per bulk bag.
Hardcore (MOT Type 1): The Compacted Layer Under Every Extension Slab
Complete UK guide to MOT Type 1 hardcore for extension foundations. Quantities for a 30m² extension, compaction in 75-100mm lifts, BCO inspection points, and prices from £35-45/tonne.
Pea Gravel: The £100 Material That Decides Whether Your Drainage Passes Building Control
Pea gravel is the bedding and surround for underground drainage pipes. Get the depth, particle size, and inspection sequence right - or fail Part H. £40-75 per tonne.