Paul Johnston Associates has completed assignments for a broad range of both public and private sector clients:
Private Sector
- SWS JV
- RPS Consulting Engineers
- Lough Neagh Sand Traders’ Association
- Arup
- Canavan Associates
- AECOM
- URS Scott Wilson
- White Young Green
- Atkins
- Mott MacDonald
- KPMG
- Renewable Energy Systems Ltd
- TCI Renewables Ltd
- Airtricity
- SSE Renewables
- Thetis Energy Ltd
- ABO Wind NI
- Natural Power Consultants Ltd
- Hydro NI
- Ross Planning
- Strategic Planning
- BDP
- Development Planning Partnership
- Tourism Development International
- Slaney River Trust Ltd
- River Beauly Fishings Co Ltd
- North Atlantic Salmon Fund (N Ireland)
- Farrans (Construction) Ltd
- Lagan Construction
- WWF UK
Public Sector
- Loughs Agency
- Dept of Culture Arts & Leisure (N Ireland)
- Inland Fisheries Ireland
- Marine Institute
- South Eastern & Shannon River Basin Districts
- Lough Neagh Partnership
- DRD Roads Service (NI)
- Waterways Ireland
- Rivers Agency (N Ireland)
- Northern Ireland Environment Agency
- Northern Ireland Fishery Harbour Authority
- Belfast City Council
- Drogheda Harbour Commissioners
- North Tipperary County Council
- Limerick County Council
- Leitrim County Council
- Sligo County Council
- Donegal County Council
- Northern Ireland Tourist Board
- Fáilte Ireland
- Údarás na Gaeltachta