Our mechanical and electrical engineers have a lot of experience in planning, designing and installing systems – which integrate seamlessly within each building.

We’re always looking to evolve the range of services we offer, to include new and emerging technologies so that we can deliver energy efficient solutions to meet the new building regulations.


  • All heating installations
  • Mechanical ventilation
  • Heat recovery systems
  • Fire protection systems
  • Air conditioning systems
  • Compressed air systems
  • Hot and cold-water plumbing
  • Sanitaryware installations
  • Natural ventilation


  • Internal and external lighting
  • Data and IT installations
  • CCTV and security systems
  • PA and voice installations
  • Fire detection and alarms
  • Access control systems
  • HV/transformer installation
  • Maintenance and PAT testing
  • Mains and sub distribution

Electrics and Lighting

Most fit-out and refurbishment projects have some element of work that calls for an electrician, even if the existing installation simply needs testing. Our team of engineers provide quality solutions which are fully tested and documented to conform to current standards. We only use NICEIC approved engineers.

  • Power installation
  • Lighting installation
  • Emergency lighting
  • Fire alarm systems
  • Security alarm systems
  • Structured cable networks
  • Testing and commissioning
  • Emergency repairs
  • Cable management

Data and Networks

We provide all network cabling solutions along with a reconfiguration of your computer network infrastructures, from small office user sites to large organisations.

We install high grade, fully tested and documented structured network cabling systems. All projects are installed by our highly experienced engineers using quality materials, with the most up-to-date terminating and testing procedures.

  • Structured network cabling
  • Fibre optic cabling
  • Relocation of equipment
  • Cable management
  • Cabinets and enclosures
  • Outlets and patch panels
  • Door entry data points

Air Conditioning

With offices, factories and retail spaces packed with heat-producing equipment and hotter summers, buildings are becoming super-heated. This means cooling them is more important than ever, whether its air conditioning, ventilation or new heat recovery systems.

Air conditioning units no longer have to be old, bulky or unattractive – they can be replaced by slim stylish, discreet units that can be an attractive addition to any building.

Onyx Interiors can provide commercial and industrial air conditioning systems. And, because no two workplaces are the same, our specialist contractors will talk to you to find out what you want and need, before recommending an air-conditioning system for you.

  • Wall mounted units
  • 4-way ceiling mounted units
  • 1-way ceiling cassette units
  • Ceiling suspended units
  • Above ceiling hidden units
  • Large capacity ducted units
  • Outdoor units