Aggregate Industries UK Ltd

Albion Drilling Group Ltd

Amalgamated Construction Group

Balfour Beatty Civil Engineering Ltd

Balfour Beatty Utilities Services

BAM Nuttall Ltd

BAM Ritchies

Banks Group Limited

Barhale Construction Plc

BEAR Scotland Ltd

Beaver Bridges

Binnies UK Ltd

Breedon Hebrides

Breedon Northern Ltd

Castle Group Scotland Ltd

CHAP Civil Engineering

Clancy 

Cleantech Civils Ltd

Colas Ltd

Concrete Repairs Ltd

Corrie Construction Ltd

Costain Ltd

Cubby Construction

David Hardie Engineering Ltd

D A MacDonald (Contractors) Ltd

D Morgan plc

Diack and Macaulay Ltd

Diamond Drilling

ESD

Farrans (Construction)

Ferrovial Construction 

Fion Construction Ltd

Forkers Scotland Ltd

Galliford Try Infrastructure Ltd

George Leslie Ltd

Glendinning Ground Works Ltd

Global Infrastructure (Scotland) Ltd

GRAHAM

Hargreaves Group

Hillhouse Quarry Group Ltd

Hochtief (UK) Construction Ltd

Hunter Construction (Aberdeen) Limited

I & H Brown Ltd

Interserve Construction Ltd

Jacks 1 Civil Engineering Ltd

James G Findlay Ltd

James Penman (Plant Hire) Ltd

James Strang

John Gunn & Sons

John Sisk & Son Ltd

Jones Bros (Civil Engineering) Co Ltd

Kelburne Construction Ltd

Keltbray

Kier Group

Kilmac Ltd

Leiths Group

Luddon Construction Ltd

Mackenzie Construction Ltd

Malcolm Group

Markon Ltd

MacAulay Askernish Ltd

McFadyens Contractors (Campbeltown) Ltd

McLaughlin & Harvey Construction Ltd

McGowan Environmental Engineering Ltd

Morgan Sindall Construction & Infrastructure Ltd

Morrison Construction

Morrison (Falklands) Ltd

MTM Construction Ltd

Murphy, J & Sons Ltd

MW Groundworks

NorPower Ltd

NRS Group

Pat Munro (Alness) Ltd

Priority Construction

PLPC Ltd

QTS Group Ltd

R Lindsay & Co Contractors Ltd

Rainton Construction (Scotland) Ltd

Raynesway Construction Ltd

RJ McLeod (Contractors) Ltd

RJT Excavations Ltd

Robertson Civil Engineering

Ross-shire Engineering Ltd

Skanska Civil Engineering

Southbay Civils Ltd

Story Scotland

Tarmac

Taziker

Taylor Woodrow

Tough Construction Ltd

TSL Contractors Ltd

VHE Construction Plc

VINCI Construction UK Ltd

VolkerStevin Ltd

WGM Civil Engineering

Whitemountain Quarries Ltd

Wills Bros Civil Engineering Ltd

W M Donald Ltd