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N J Montgomery St Martin
Napper Architects Limited Newcastle upon Tyne Tyne and Wear  
National Association of Shopfitters Warlingham Surrey  
National Specifications UK St Ives Cambridgeshire  
Natural Building Systems Limited Diss Suffolk  
Natural Resources Wales Llanrwst Conwy  
Natural Systems Ltd Settle North Yorkshire
NBJ (London) Ltd Lutterworth Leicestershire
NBS Newcastle upon Tyne Tyne and Wear
NDM (Metal Roofing & Cladding) Ltd Staines upon Thames Surrey
Neil Ferguson Chartered Architect Isle of Skye Highland
Network Rail Infrastructure Ltd Central Milton Keynes  
New Build Modular Ltd Bristol South Gloucestershire  
Newcastle University Newcastle-upon-Tyne Tyne & Wear  
Nexus Consulting Engineers Ltd Lampeter Ceredigion  
NHG Timber Limited Croydon Surrey
Nicholas Williams Chartered Architect London  
Nick Kenchington Ltd Corfe Castle Dorset
Nick Midgley Design Brighouse West Yorkshire
Nicks & Co (Timber) Ltd Gloucester Gloucestershire
Nigel Braden Timber Consultancy Lewes East Sussex  
NMITE Hereford Herefordshire  
NOJI Sligo Town Sligo  
Norbord Cowie Stirlingshire
Norder Design Associates Belper Derbyshire
Nordic Structures Quebec
Norfolk Timber Frames Ltd Kings Lynn Norfolk
Norman Limited St Helier
Norscot Joinery Limited Wick Caithness
North Architects London  
Northumbria University Library Newcastle upon Tyne
Nottage Joinery & Timber Merchants Bridgend Mid Glamorgan
Novus Property Solutions Ltd Stoke-on-Trent Staffordshire
NPS South West Limited Exeter Devon  
NPTC Group of Colleges Neath Neath Port Talbot  
O'Dwyer, Nicholas Ltd Dublin 14
O'Keefe Scanlon Ltd Farnham Surrey
O'Reilly Design Ltd Carrickfergus Co Antrim
Oak Frames Direct East Sussex
Oakenstone Design Planning Build Cromford Derbyshire  
Oakenwoods Group Ltd Maidstone Kent  
Oakleaf Building Surveyors Reading Berkshire
Oakridge Building Company Kilmacanogue Co Wicklow
Oban Joinery Services Ltd Oban Argyll
Offsite Design Solutions Ltd Manchester
OFP Timber Framed Homes Ltd Sandwich Kent
Olive Modular Ltd Chichester West Sussex  
ONCE Civil & Structural Ltd Dublin 12
Openwall Ltd Liverpool Merseyside  
OPS Structures Cirencester  
Optimal Structural Engineers Ltd Hove East Sussex
Optio Lichfield  
Orbit Architects London  
Oregon Timber Frame Ltd Selkirk Scottish Borders
Original Box Sash Windows Company, The Merthyr Tydfil
ORMS Architecture Design London
Outward Images Ltd Cambridge Cambridgeshire
Overbury Plc & Morgan Lovell London
Owens Galliver Architects LLP Reading Berkshire
Oxford Oak Abingdon Oxfordshire