Is It Worth Buying a Cement Mixer? (UK DIY Maths)
One-weekend driveway, garden wall, shed foundation — at what point does buying a cement mixer make sense versus renting one? The honest break-even numbers.
4 min read
The numbers
- Domestic 130L electric cement mixer, new from a high-street retailer: £200–£350
- DIY Toolshare peer-to-peer rental: ~£20–£30/day
- Break-even: 8–12 rental days
When owning makes sense
- You are doing a multi-phase project over months (extensive landscaping, full driveway, garden-wall reconstruction)
- You do garden projects every spring / autumn
- You have somewhere dry to store it (rust kills mixers)
- You are willing to rinse it fully after every batch. Unrinsed concrete in a drum = bin
When renting wins
- One-off weekend project (shed base, short wall, small patio)
- You have no garage / shed with space
- You want a petrol mixer for an off-grid site — petrol mixers are expensive (£400+) to buy and overkill for DIY
- You are not 100% sure you will use it again — 70% of DIYers who buy a mixer use it less than 3 times
Tips for the weekend rental
- Add water first, then aggregate, then cement. Dry-loading cement first creates lumps that never mix out.
- Rinse between batches. Hardened concrete in the drum is the main reason owners keep rental deposits.
- A 130L drum yields ~65L of wet concrete per batch. Plan your delivery and mixing order around that.
- Hire a wheelbarrow alongside. Moving wet concrete from mixer to site in 4-wheel garden trollies is not fun.
Frequently asked questions
Is a 130L cement mixer big enough for a driveway?
For a domestic driveway base (100mm depth of concrete over 30m²) you need ~3m³ of concrete. A 130L mixer yields ~65L per batch so that is ~46 batches — doable but long. Larger projects benefit from ready-mix delivery.
Can I mix concrete by hand instead of renting?
For anything under 0.25m³ (e.g., a small fence post batch), yes, with a mixing board and shovel. For more than that, your back will hate you and the mix quality drops.