Careford Construction Ltd - Broxbourne

Bolt Structures - Harrow

Mine Technology Services Ltd - Godalming

Joseph - Broxbourne

Pro Dec Roofing - Broxbourne

Stotfold Engineering Co Ltd - Biggleswade

Builders Broxbourne - Broxbourne

Green Building Design Consultants Ltd - Hertford

First Engineering - Waltham Cross

G R W Construction Ltd - Hoddesdon