Main contractors in the UK

20744 UK companies working as main contractors.

• O Oldfield Construction (London) Ltd Ruislip · Main contractor · 1-9 employees

  Oldfield Construction Limited offers home improvements in Ruislip. Qualified builders with 51+ years of experience, delivering durability and reliabil

• O Oldham Bros Ltd. Liverpool · Demolition · 1-9 employees

  Oldham Bros Ltd are trusted demolition contractors in Merseyside with over 75 years' experience. Specialists in demolition, site clearance, recycling,

• O Oldman Homes Ltd Norwich · House builder · 1-9 employees

  New build homes in Lowestoft and Suffolk from Oldman Homes, with 2, 3 & 4 bedroom houses and bungalows on premium developments in Oulton, Carlton Colv

• O Oliva Contracts Colchester · Design & build · 1-9 employees

  Oliva Contracts is a specialist builder and construction contractor working across multiple sectors delivering both Residential and Commercial Constru

• O Olive Building Ltd Wickford · Main contractor · 1-9 employees

  Olive Building LTD is a reputable building company in Essex, established in 1997, specializing in new builds, extensions, renovations, and conversions

• O Oliver Building Services Ltd Hatfield · Main contractor · 1-9 employees

  Oliver Building Services Ltd offers new builds, property extensions, loft conversions, home offices, garage conversions, and general building services

• O Oliver Connell And Son Ltd South Greenford · Concrete works · 50-249 employees

  Oliver Connell & Son Ltd are an experienced reinforced concrete frame company with the ability to integrate groundwork and associated works in one pac

• O Oliver Corbett Interiors Bristol · Kitchen fitting

  Expert kitchen and bathroom fitters in Bristol & Bath with 34 years of experience. All trades in-house, no subcontractors. Trusted by Grand Designs. F

• O Oliver Hazael Bespoke Carpentry Bath · Carpentry & joinery · 1-9 employees

  Bespoke carpentry and home renovation specialists in Bath. We focus on wardrobes, alcove units, shelving, and storage, offering design advice and mana

• O Oliver's Contracting Ferndown · Landscaping

  Dorset and Hampshire garden landscaping specialists. Patios, driveways, fencing, turfing, and groundworks by Oliver's Contracting. Free quotes availab

• O Oliver’S Services Ltd Pontypridd · Plumbing

  Oliver's Services offers tailored commercial plumbing, heating, renewables & sprinkler systems. Contact us for reliable solutions today!

• O Oliveti Group Leicester · Main contractor · 10-49 employees

  Oliveti Group is a leading construction, maintenance, and refurbishment company with over 30 years of experience, delivering seamless projects and cul

• O Ollie Mart Building Services Ltd Matlock · Main contractor · 1-9 employees

  Ollie Mart Building Services are builders in Matlock specialising in natural stone construction. Builders Matlock.

• O Ols T Construction Ltd London · Drylining · 1-9 employees

  OLS T Construction offers professional construction services with hands-on expertise in London, specializing in high-quality finishing trades and refu

• O Olver Electrical Contractors Ltd Callington · Electrical · 1-9 employees

  Olver Electrical Contractors Limited offer a broad range of electrical services to our increasing client base throughout the South West of England.

• O Olympia Projects Leeds · Design & build · 1-9 employees

  Olympia Projects Limited is an established, family-run commercial development business, delivering projects throughout the UK with over 55 years of ex

• O OLYMPUS BUILD LTD Dunstable · Main contractor · 1-9 employees

  Olympus Build Ltd offers new builds, extensions, and loft conversions with in-house architects and engineers. They cover Herts, Beds, Bucks, Northampt

• O Olympus Property Development Ltd Manchester · Main contractor

  Premium construction, structural works, renovations and property development across Manchester, Liverpool, Preston and the wider North West. Request a

• O Olympus Property Group Ltd London · House builder · 1-9 employees

  Olympus Property Group offers expert residential construction and surveying services in Hampshire, including new builds, renovations, loft conversions

• O Olympus Site Solutions Ne Ltd Newcastle Upon Tyne · Demolition

  Olympus Site Solutions NE Ltd: Specialist demolition & soft strip contractors for commercial, retail & industrial sites across the UK. CHAS & SafeCont

• O Om Barker Builders Ltd Bagshot · Extensions

  OM Barker Builders Ltd is an experienced building company undertaking house extensions, garage conversions and more in Bagshot, Bracknell and the surr

• O Omb Construction Ltd Pinner · Main contractor · 1-9 employees

  OMB Construction Ltd is a construction company based in Pinner, Middlesex. The company was incorporated in 2019.

• O Omega + Group Ltd London · Main contractor · 1-9 employees

  Omega Group is a leading construction and MEP contractor based in West London, delivering high-value projects across residential, commercial, and mixe

• O Omega Electrical Contractors (Crt) Ltd Evesham · Electrical

  Leading electrical contractor in the Midlands, offering outstanding service at competitive prices. Certified technicians for residential and commercia

• O Omega Lofts Ltd Nottingham · Loft conversions · 1-9 employees

  Omega Lofts Limited specialises in loft conversions, home extensions, and fitted bathrooms/kitchens in Nottingham. Established in 2012, they offer pro

• O Omel Group Wembley · Extensions

  Omel Group offers comprehensive construction solutions across London and the South East, specializing in extensions, renovations, general construction

• O Omfc Ltd London · Main contractor · 1-9 employees

  OMFC Ltd is a construction company based in London, undertaking a variety of projects across residential and commercial sectors. They focus on deliver

• O Omikon Construction Ltd London · Design & build

  Omikon Construction Limited is a London-based construction company offering quality, reliable, and sustainable services. We combine innovation and exp

• O Ominiworks Ltd Bridgwater · Roofing

  Ominiworks offers quality construction services in the South West, specialising in roofing, driveways, patios, decking, fencing, and landscaping. Cont

• O Omni Co. (Trading) Ltd Deal · Main contractor

  Omni Co. is a multi-disciplinary construction company with specialist divisions in Construction, Engineered Timber, and Joinery, offering a complete s

• O Omni Construction (Edin) Ltd Edinburgh · Refurbishment

  OMNI CONSTRUCTION (EDIN) LTD offers residential construction, repair, and refurbishment services. Specialising in home improvements, maintenance, and

• O Omnibrick Ltd Milton Keynes · Main contractor · 1-9 employees

  All aspects of Building and Construction for Residential, Commercial, Educational and Public Sectors. Omnibrick LTD is an emerging fast growing compan

• O Omniform Ltd London · Main contractor · 1-9 employees

  Omniform is a London construction partner for architect-designed homes: whole-house refurbishments, structural work, basements, and new build properti

• O Omniscience Care Ltd London · Main contractor · 10-49 employees

  Omniscience Care is a specialist partner in complex built-environment projects, aligning design, safety, and commercial outcomes for resilient, high-p

• O OMNYRA London · Main contractor

  OMNYRA provides execution-led leadership for high-risk industrial projects, shutdowns, and major hazard environments, restoring authority and control.

• O ON LEVEL CONSTRUCTION Manchester · House builder · 1-9 employees

  On Level Construction is a professional and highly regarded construction company based in Tameside, Manchester. With over 40 years collective experien

• O On Point Building & Joinery London · Main contractor · 1-9 employees

  On Point Building & Joinery Ltd offers expert building and joinery services in Blackpool and the North West. Quality craftsmanship for every project,

• O On Site Framing Ltd Redruth · Timber frame · 1-9 employees

  On Site Framing offer timber frame solutions across Cornwall. We provide cost effective timber frames which lower construction costs.

• O On The Verge Roofing Ltd Wrexham · Roofing

  Roofing Contractor Wrexham, North Wales, Shropshire and Surrounding Areas. Offering residential and commercial roofing solutions, roof repairs, slatin

• O On Time Builders Ltd London · Refurbishment · 1-9 employees

  Ontime Builders Ltd specialises in high-end full refurbishment, renovation, bathrooms, kitchens, painting, decorating, plumbing, electrical repairs, e

• O On Top Roofing Ltd Ayr · Roofing

  On Top Roofing Ltd provides the best roofing services across Ayrshire & nearby areas. Tiled, flat, felt, rubber or fibreglass roofs.

• O On Track Technicians Ltd Lisburn · Rail infrastructure · 50-249 employees

  A rail-only principal contractor delivering safe, reliable infrastructure solutions, skilled teams and proven framework programmes across NI, ROI & th

• O On-Top Roofing Norfolk Ltd Great Yarmouth · Roofing

  OnTop Roofing Norfolk offers comprehensive roofing services including flat roofs, repairs, pitched roofs, warm roofs, chimneys, and fascia & guttering

• O One Bloomsbury Ltd London · Extensions

  One Bloomsbury is a London-based construction and building company offering bespoke design, construction, and maintenance services for residential and

• O One Build Developments Ltd Wellingborough · Main contractor · 1-9 employees

  One Build Developments is a construction company based in Wellingborough, England. Contact us for your building needs.

• O One Call Roofing Solutions Bristol · Roofing

  One Call Roofing Solutions delivers expert roofing repair & installation in Bristol, from flat roof repair and roof tile repair to commercial roofing

• O One North Property Ltd Northallerton · House builder · 1-9 employees

  One North Property Ltd is a North Yorkshire based residential developer, specialising in building stunning new homes and barn conversions in rural loc

• O One Oak Construction Ltd Oxfordshire · Refurbishment · 1-9 employees

  One Oak Construction offers design-led construction, specialising in residential builds and heritage restorations. We deliver high-quality, tailored p

• O ONE SHOT UTILITIES LTD Wallington · Utilities

  One Shot Utilities is a Wallington based multi-utility company providing utilities upgrade and installation services, in nearby locations such as Bans

• O One Source Construction Services Ltd Telford · Bricklaying · 1-9 employees

  One Source Construction Services Ltd, based in Telford, offers a comprehensive range of building services across the Midlands, including new builds, r