SOA specialised works categories
The SOA categories represent the different types of works provided for in the Public Contracts Code. They are divided into OG (General Works) categories and OS (Specialised Works) categories, and serve to define the technical scope within which a company is authorised to operate in public procurement.
Go to the OS listOS categories identify specialised works that complete a project: systems, special structures, finishes, signage, remediation. Each category has its own value classification.
List of OS categories
39 categories
OS1
Earthworks
OS2-A
Decorated surfaces of real estate forming part of the cultural heritage and movable cultural assets of historical, artistic, archaeological and ethno-anthropological interest
OS2-B
Movable cultural assets of archival and library interest
OS3 Water and sanitary systems, kitchens, laundries
OS4 Electromechanical conveyor systems
OS5
Pneumatic and intruder alarm systems
OS6
Finishes for general works in wood, plastic, metal and glass
OS7
Building and technical finishes for general works
OS8
Waterproofing works
OS9
Illuminated signage and traffic safety systems
OS10
Non-illuminated road signage
OS11
Special structural devices
OS12-A
Road safety barriers
OS12-B
Rockfall barriers, snow fences and similar
OS13
Precast reinforced concrete structures
OS14
Waste disposal and recovery plants
OS15
Cleaning of sea, lake and river waters
OS16
Systems for power generation plants
OS17
Telephone lines and telephone systems
OS18-A Steel structural components
OS18-B Curtain wall components
OS19 Telecommunication and data transmission network systems
OS20-A
Topographic surveys
OS20-B
Geognostic surveys
OS21 Special structural works
OS22
Water treatment and purification plants
OS23
Demolition works
OS24
Green spaces and street furniture
OS25
Archaeological excavations
OS26
Special paving and superstructures
OS27
Electric traction systems
OS28 Heating and air-conditioning systems
OS29
Railway track
OS30 Internal electrical, telephone, radiotelephone and television systems
OS31
Cable transport systems
OS32 Timber structures
OS33
Special roofing
OS34
Noise reduction systems for transport infrastructure
OS35 Low environmental impact works
SOA Categories,
classifications and requirements
The category specifies the types of work the company is authorised to carry out, whilst the classification determines the maximum value of such work.
OG
1 — 13
General works categories
Complete works: structure, services and finishes of a building, a road or a dam.
OS
1 — 35
Specialised works categories
Specific works that complete the project: services, special structures, specific finishes.
VIII
CLASSIFICATIONS
Classifications and value limits
I to VIII: indicate the maximum value of works for which the contractor is qualified.
