narrower concept asphaltic surfacing work Concept caisson construction work Concept carpentry/woodworking Concept cast stone work Concept conduit-type sewer work Concept corrosion protection work Concept dewatering work Concept drainage work Concept dredging work Concept dressed stone work Concept drilling work Concept driving work Concept earthworks Concept fixing Concept flooring work Concept glass works Concept glazing work Concept grouting work Concept installation work(electrical) Concept installation work(gas and water) Concept insulation Concept joinery work Concept landscaping Concept lightning protection system Concept masonry work Concept metalwork/locksmiths work Concept painting Concept parquet work Concept plain concreting/reinforced concreting Concept plastering/stucco work Concept plumbing work Concept protection works(water/dyke/coast) Concept road construction work Concept roller shutter work Concept roofing and roof waterproofing works Concept scaffolding work Concept screed work Concept sealing(damp proofing) Concept sealing(water proofing) Concept sheeting work Concept steel construction work Concept tiling Concept track construction work Concept ventilation system Concept wall papering Concept wooden pavement block work Concept