A cement block making business in Tanzania can start with about TSh 3 to 8 million (roughly USD 1,150 to 3,100) for a manual machine, a small yard and the first materials, or TSh 15 to 40 million and up for an electric or hydraulic machine that makes thousands of blocks a day. Using 2026 example prices, a 6-inch block costs about TSh 1,000 to 1,300 to make and sells for TSh 1,700 to 2,500, so a margin of TSh 400 to 900 per block is realistic if you sell in volume. The businesses that last get three things right: blocks that pass a drop test every time, a yard close to active building sites, and transport to deliver to the customer's plot.
Why block making works as a business
Tanzania's towns are growing fast. Dar es Salaam, Dodoma, Arusha, Mwanza and Mbeya add new neighbourhoods every year, and nearly every house, boundary wall and commercial building there uses cement blocks. Customers range from families building their first home to fundis, contractors and councils. The technology is simple; the discipline is not. Correct cement ratio, proper curing and on-time delivery separate a growing yard from one that closes after a season.
How much capital do you need?
| Item | Manual machine (example) | Electric or hydraulic machine (example) |
|---|---|---|
| Machine | TSh 1 to 3 million | TSh 10 to 30 million or more |
| Yard rental (per year) | TSh 0.5 to 2 million | TSh 2 to 6 million |
| First materials (cement, sand, water) | TSh 1 to 2 million | TSh 3 to 8 million |
| Water tank, wheelbarrows, sheeting, shade | TSh 0.5 to 1 million | TSh 1 to 3 million |
| Output per day (example) | 300 to 800 blocks | 2,000 to 6,000 blocks |
Examples only. Machine and land prices vary a lot by region.
Most owners start with a manual machine, build a customer base, save, and buy a larger machine after a year or two. That is safer than borrowing heavily before you know your market.
What does one block cost to make?
Example for a 6-inch (150 mm) block at Dar es Salaam prices in 2026:
- Cement: one 50 kg bag (about TSh 17,000 to 18,500) makes roughly 25 to 35 blocks with a sound mix. That is TSh 500 to 700 per block.
- Sand and water: about TSh 150 to 300 per block, depending on the local price of a truckload of sand.
- Labour: usually paid per block or per day, often TSh 100 to 200 per block.
- Overheads: yard rent, power, transport and breakages, about TSh 100 to 200 per block.
That totals roughly TSh 1,000 to 1,300 per block. Selling at TSh 1,800 to 2,200 at the yard gives a margin of TSh 500 to 900 per block before delivery. Selling 10,000 blocks a month could produce around TSh 5 to 9 million in profit, provided they actually sell. Run the numbers at your own local prices before you commit.
How to keep block quality high
- Measure the mix. Good blocks are typically made at about 1 cement to 6 to 8 sand by volume. Use a gauge box or buckets, never guesswork.
- Use clean sand. Avoid sand heavy with clay or salt. Never use beach sand.
- Cure the blocks. Spray them morning and evening for at least 7 days, under shade or plastic sheeting.
- Let them age. Do not sell blocks younger than 14 days; 28 days gives full strength.
- Drop-test daily. Drop a dry block from waist height onto hard ground. If it breaks into many pieces, fix the mix.
As you grow, consider lab testing for compressive strength and recognised quality certification, especially if you want to supply large contractors and public projects. For how blocks compare with fired bricks, read concrete blocks vs bricks.
Registration and permits
A formal block business usually needs business or company registration with BRELA, a TIN from TRA and a business licence from the council or relevant authority. The yard should be on land where the activity is allowed, and you should manage dust, waste water and worker safety. Check current requirements with your council and TRA.
How to find customers
- Location: a yard near areas under construction cuts transport costs and catches passing builders.
- Fundis and contractors: they tell clients where to buy. Give them good service, trade prices and on-time delivery.
- Delivery: owning a truck, or having a dependable arrangement with one, sets you apart. Most buyers want blocks delivered to the plot.
- Social media: photos of tidy stacks and a short drop-test video build trust. WhatsApp Business and Instagram are enough to start.
- Records: write down every sale, expense and debt. Block yards more often fail from unpaid credit than from a lack of customers.
Mistakes that kill block businesses
- Selling green blocks early to raise cash.
- Buying cement far ahead and letting it go hard in damp storage.
- Giving credit with nothing in writing.
- Starting with a big machine before you have a market.
- Having no reliable water; without water there is no curing and no production.
Frequently asked questions
How many blocks does one bag of cement make?
For 6-inch blocks, usually 25 to 35 depending on the mix and mould size. You get more 4-inch blocks per bag.
Which machine is best to start with?
A manual machine that makes 4, 5 and 6-inch blocks is enough to start. Buy from a supplier who stocks spare parts and offers service.
How many workers does a block yard need?
With a manual machine, 3 to 5 people: a mixer, a machine operator, a stacker and someone on curing. Larger machines need more.
When do block sales peak?
In the dry season, when most people build. During the heavy rains, keep producing and stock up for the next season.
Building, or need quality advice?
Vika Construction works with material suppliers across Tanzania and checks block quality on every project. Contact us. Kwa Kiswahili, soma biashara ya kufyatua matofali.
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