In Tanzania, the Contractors Registration Board (CRB) registers contractors in categories, such as building works and civil works, and in classes that reflect each company's capacity. Class One is the highest and is allowed to take on the largest projects; the higher the class number, the smaller the maximum project value. When you hire a contractor, the class tells you whether the company is approved to carry out a project of your size and type.
What is the Contractors Registration Board?
The Contractors Registration Board is the government body that registers and regulates contractors in Tanzania. Its role is to make sure that companies carrying out construction works meet minimum standards of qualified staff, equipment and financial capacity, and to promote quality and ethical practice in the industry.
What are the main contractor categories?
CRB registers contractors in different categories depending on the type of work they do. The most common are:
- Building works: houses, offices, schools, commercial buildings and similar structures.
- Civil engineering works: roads, bridges, drainage, earthworks and similar infrastructure.
- Electrical and mechanical works: installations such as power, air conditioning and plumbing systems.
- Specialist works: specific trades such as foundations, steel structures or other specialised services.
A company may be registered in more than one category, and in a different class for each.
How do the classes work?
Within each category there are several classes. The general principle is simple:
| Class | What it means |
|---|---|
| Class One | Highest class, for the largest and most complex projects |
| Middle classes | Medium-sized projects, with a maximum contract value set by CRB |
| Lower classes | Smaller projects with lower maximum values |
Each class has requirements for qualified technical staff, equipment and finances, and a limit on the value of a single contract. The exact limits are set and updated by CRB, so check the current figures on the CRB website.
Why does the class matter to you?
- Legal compliance. A contractor should only take on projects within the limit of its class.
- Capacity. A higher class means the company has shown it has the people and resources for bigger work.
- Risk. Hiring a contractor beyond its capacity increases the risk of delays and poor quality.
- Tenders. Public and corporate clients often require a minimum CRB class to bid.
Is a higher class always better?
Not always. A higher class shows capacity, but the right contractor is one with the right experience for your type of project. A company that has built many bank branches may be the best choice for a fit-out, even if a larger company is available. Use the class as a minimum requirement, then compare experience, engineers and past projects. Our checklist on choosing a construction company helps with this.
How do contractors move up a class?
Contractors can apply to be upgraded when they meet the requirements of a higher class, for example by employing more qualified staff, completing larger projects and showing stronger finances. Upgrading reflects real growth in capacity.
Frequently asked questions
Which CRB class is the highest?
Class One is the highest class in each category and can take on the largest projects.
Can a building contractor do road works?
Only if it is also registered in the civil works category. Building and civil works are separate categories with separate classes.
Where can I check a contractor's registration?
With the Contractors Registration Board. Ask the contractor for its certificate and confirm the details with CRB.
Does CRB registration guarantee good quality?
No. Registration shows that a contractor meets minimum requirements, but quality still depends on the people, supervision and procedures on your site. Check past projects as well.
Work with a contractor you can check
Choosing a properly registered, experienced contractor protects your project from the start. Learn more about Vika Construction or talk to our team.
