There are three realistic ways to start a concrete business in Tanzania. The cheapest is a mixer and pouring crew that mixes, carries and places concrete on the client's site, which can start with about TSh 6 to 20 million (roughly USD 2,300 to 7,700) for a mixer, a poker vibrator, wheelbarrows, transport and a crew of 6 to 12 people. The second is precast concrete products such as paving blocks, septic and latrine rings, fence posts and small culverts, starting at about TSh 5 to 40 million. The third is a ready-mix plant with a batching plant, transit mixers and a lab, which needs hundreds of millions to billions of shillings. Most successful concrete businesses we know started with the first or second route, built a reputation for quality, and grew from there.
Why is concrete a good business in Tanzania?
Almost every modern building in Tanzania uses concrete: foundations, ground slabs, columns, ring beams, lintels, suspended slabs, stairs, driveways and drains. A typical house slab needs 15 to 40 m³ of concrete, and a three-storey building needs several hundred. Storey buildings are going up in every growing town, and most owners and small builders have neither the machines nor a trained crew to place a whole slab in one day. That gap is the business.
| Route | Startup capital (example) | Main customers | Strengths | Challenges |
|---|---|---|---|---|
| Mixer and pouring crew | TSh 6 to 20 million | Homeowners, fundis, small contractors | Low capital, steady work in towns | Hard physical work, rain stops work, quality depends on the crew |
| Precast products | TSh 5 to 40 million | Builders, councils, contractors | You sell stock, not just labour | Needs a yard, moulds and curing time |
| Ready-mix plant | Hundreds of millions and up | Large contractors, high-rise and public projects | Big volumes, controlled quality | Heavy capital, lab, trucks, skilled staff |
All figures are rough 2026 examples. Prices vary by region and by whether you buy new or used equipment.
Route 1: running a mixer and pouring crew
The client buys the cement, sand, aggregate and steel. You bring the machine and the crew, then mix, carry, place and compact the concrete.
What you need:
- A one-bag or half-bag concrete mixer in good condition.
- A petrol or electric poker vibrator, plus a spare needle.
- 4 to 8 wheelbarrows, buckets, shovels and a gauge box for measuring by volume.
- Transport to move the mixer between sites, or a reliable arrangement with a pickup owner.
- Planks and runways for wheelbarrows on the slab, ladders, and safety gear.
- A crew of 6 to 12, led by a foreman who understands mix ratios and compaction.
How crews charge: most charge per bag of cement mixed, per m³, or a fixed price for the whole slab. In 2026 a common range is TSh 4,000 to 8,000 per bag. A 150-bag slab can bring in TSh 600,000 to 1,200,000 for one long day, before paying the crew, fuel and transport. These are examples; rates vary widely by town.
Quality is what wins you the next job
Clients hire the same crew again when the concrete has no honeycombing, the slab does not crack and the roof does not leak. These are the habits that make the difference:
- Batch by volume with a gauge box. For C20 a common site mix is 1 cement : 2 sand : 4 aggregate. For C25 it is roughly 1 : 1.5 : 3. Shovel counts are not a measurement.
- Keep the water down. Wet concrete is easy to place and weak when it sets. Adding water to speed up the pour is the most common mistake we see.
- Mix for long enough, usually 2 to 3 minutes per batch after all materials are in.
- Vibrate properly, especially in columns and where steel is congested. A few seconds per spot is enough; over-vibrating separates the mix.
- Never stop halfway. A long break mid-slab creates a weak cold joint.
- Tell the client about curing. Keep the concrete wet for at least 7 days. See how to cure concrete in hot weather.
For more on grades and mixes, read concrete grades and mix ratios explained.
Route 2: precast concrete products
Precast products sell every day and do not need you on a client's site for every sale.
| Product | Who buys | Main equipment |
|---|---|---|
| Paving blocks | Homes, car parks, hotels, councils | Vibrating table or press, moulds, pigments |
| Septic and latrine rings | Builders of toilets and septic tanks | Steel moulds, curing area |
| Small culverts | Estate roads, plot drainage | Large moulds, reinforcement |
| Fence posts | Wire fences, farms | Moulds, thin bars |
| Kerbs, ventilation blocks | Buildings, internal roads | Moulds |
Our guide to the paving blocks business covers that product line in detail.
Route 3: a ready-mix plant
A ready-mix plant weighs cement, sand, aggregate, water and admixtures by computer, and transit mixers deliver the concrete to site, often with a concrete pump for upper floors. The investment covers the batching plant, at least three transit mixers, a pump, a lab for cube testing, stockpile space and skilled staff. It suits established companies or investors with a pipeline of large projects, and it lives or dies on consistent quality backed by test results.
Example monthly numbers for a mixer crew
| Item | Example |
|---|---|
| Jobs per month | 10 to 16 slabs and foundations |
| Average bags per job | 80 to 150 |
| Rate per bag | TSh 5,000 |
| Revenue | TSh 4 to 12 million |
| Crew, fuel, transport, maintenance | 55 to 70 percent of revenue |
| Profit before tax | TSh 1.2 to 5 million |
An example only. The long rains cut the number of pours, so keep reserves for those months.
Registration and permits
For a formal business you will normally need business or company registration with BRELA, a TIN from TRA and a business licence. To work for larger contractors or public clients, CRB registration as a specialist contractor may be required; see CRB contractor classes. A precast yard or ready-mix plant must sit on land zoned for industrial use and manage dust, waste water and noise. Check current requirements with the relevant authorities.
Finding customers
- Fundis and small contractors need a reliable pouring crew every week.
- Hardware shops and cement dealers get asked "who pours slabs well?" every day.
- Social media: short videos of an organised pour, a crew in safety gear and a clean finished slab.
- Reliability: turn up on the day and hour you promised. A late crew wastes the client's other trades for the whole day.
Mistakes to avoid
- Adding water to finish faster.
- Accepting two big pours on the same day without enough people.
- Having no spare mixer or mechanic; a breakdown mid-slab is expensive for everyone.
- Letting the crew work on upper slabs without edge protection and safety gear. See construction site safety.
Frequently asked questions
How much concrete does one bag of cement make?
At a 1:2:4 mix, 6 to 7 bags of cement make about 1 m³ of concrete, so one bag makes roughly 0.15 m³.
How much does a concrete mixer cost in Tanzania?
A used one-bag or half-bag mixer starts at a few million shillings; new ones cost more. Compare spare parts availability and after-sales service, not just price.
What is the best time of day to pour a slab?
Early morning, so the concrete is placed before the midday heat, and never in heavy rain.
How many workers does a slab pour need?
For a typical house slab, 8 to 12: mixer operators, wheelbarrow runners, placers, a vibrator operator and a foreman.
Need a concrete crew or advice?
Vika Construction pours concrete with an engineer checking every slab. Contact us about your project. Kwa Kiswahili, soma biashara ya zege Tanzania.
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