Digging a pool with a mini excavator is the most efficient way to excavate your pool — shell, concrete or kit. Compared with hand digging (unrealistic for 30 to 50 m³) or a standard excavator (too big for a garden), the mini excavator offers the ideal compromise.
Why a mini excavator to dig a pool?
- Compact: fits through a gate from 90 cm and manoeuvres without wrecking the garden
- Ample power: a 1.8 to 2.5 t digs a pool hole in 1 to 2 days
- Precision: the articulated arm meets the pool installer's exact dimensions
- Versatility: then reusable for trenches, pipes, gardening
Hiring a contractor for the excavation costs €1,500 to €4,000. Renting comes to €250 to €400/day. Buying a new machine from €11,666 excl. VAT (24-month warranty) pays off if you have other projects ahead.
Pool types and their impact on excavation
Polyester shell pool
The fastest to install, delivered in one piece. Standardised sizes (5×2.5 m to 12×5 m), fixed depths (1.40 to 1.50 m). The excavation must meet centimetre-accurate dimensions and include a 20 cm sand bed. The manufacturer's plan simplifies the work, but tolerances are tight.
Concrete pool
The most customisable, but a more complex excavation: allow 60 to 80 cm of clearance on each side for the formwork and rebar, plus the slab thickness (15–20 cm) and the gravel bed (15 cm). A 9×4.5 m pool can require an 11×6.5 m excavation 2 m deep — 70 to 80 m³ of spoil (mini excavator 2.5 to 3 t).
Kit pool
Intermediate in complexity, with more forgiving tolerances. Often chosen by DIY builders — buying or renting a mini excavator is especially relevant here.
What weight class to dig a pool?
- 1.5 to 1.8 tonne: small pools (up to 6×3 m), easy ground. Max depth ~2.5 m
- 2 to 2.5 tonnes: the optimal choice for most standard pools (8×4 m), ideal in clay or stony ground
- 3 tonnes and up: large pools (10×5 m+) or very hard ground needing a breaker
For the vast majority of projects, a 1.8 to 2.5 tonne mini excavator is the best choice.
Excavation dimensions to plan for
The hole is always bigger than the pool: add 50 to 80 cm on each side, 15 to 20 cm below the deepest point (draining gravel), and allow a slight batter to the walls. Example: for an 8×4 m shell 1.50 m deep, the excavation is ~9.5×5.5 m by 1.70 m — ~28 m³ of soil to remove.
Regulations and paperwork
Permit or declaration (France): under 10 m² = no formalities; 10 to 100 m² = a prior declaration (Cerfa 13703, 1 month); over 100 m² or a cover > 1.80 m = a building permit (2 months). Check your local planning rules (distances to boundaries, visible finishes). A utility-location request is mandatory before any digging. Remember to notify your home insurer.
Never dig without locating buried networks, even on private land: a damaged gas pipe or electrical cable can cause a fatal accident and engages your civil and criminal liability.
The digging steps
- Setting out and pegging: exact outline with pegs and string lines
- Topsoil stripping: 20 to 30 cm of topsoil with a wide bucket
- Digging in passes: 40 to 50 cm layers, from the centre outwards
- Shaping the walls: a narrower bucket
- Removal: trailer or mini dumper
- Finishing: compacting the base, geotextile, draining gravel bed
Spoil management
For an 8×4 m pool, you remove 25 to 50 m³. Calculate: length × width × depth × bulking factor (1.2 to 1.4). A 30 m³ volume can become 36 to 42 m³ once bulked. Options: reuse on site (the cheapest, with topsoil set aside separately), waste facility (free for clean soil), a mini dumper as a complement (from €3,894 excl. VAT — the excavator+dumper pairing lets you work continuously), or a rubble skip (€250 to €400 for 8 m³). Do not stockpile soil closer to the edge than half the excavation depth.
The ideal pairing for a pool
Mini excavator + mini dumper: the excavator loads straight into the skip that hauls it away. Continuous work.
Common mistakes to avoid
- Not locating buried networks: the most serious mistake, even on your own land
- Underestimating the excavation dimensions: allow for the pool installer's margins
- Ignoring the water table: plan for a pump in wet areas
- Forgetting the service conduits (filtration, electricity) before the slab
- Working alone: a second person guides the dimensions and removal
- An undersized machine: prefer a slightly larger model
Which CZN models for a pool?
| Model | Weight | Max depth | Price from excl. VAT |
|---|---|---|---|
| XC18S Pro | 1.8 t | 2.60 m | €11,666 |
| CL20S | 2 t | 2.27 m | €14,963 |
| XC25S | 2.5 t | 2.60 m | €23,399 |
Rent or buy for the pool?
Excavation by a professional costs €1,500 to €4,000. Renting a 2 t comes to €250–400/day (€500 to €1,200 for 2–3 days). Buying (from €11,666 excl. VAT, financing over 12 to 60 months) becomes worthwhile if you have other work planned, all the more so since the machine keeps 60 to 70% of its value after 3 years.
Pool + mini excavator FAQ
How many days to dig a pool?
For an 8×4 m, allow 1 to 2 full days (7 to 14 h) with a 1.8 to 2.5 t. In soft ground, one day may be enough; in compact clay, allow 2 days.
Can you dig a pool without a CACES?
Yes. The CACES is only mandatory in a professional context. For private use on your own land, no certification is required. CZN includes a 30-minute handover on delivery.
What digging depth for a pool?
For 1.50 m of water, the excavation must reach 1.70 to 1.90 m (depth + 20 cm draining bed). The 1.8 to 2.5 t machines easily reach these depths.
What to do with the excavated soil?
Reuse it to level, create mounds or backfill. The surplus goes to a waste facility (free for clean soil) or via material-donation sites.
Does the pool have to be declared for tax?
Yes (in France). It raises the cadastral value (higher property tax). Declare within 90 days via the Cerfa 6704 form. Some municipalities grant an exemption for the first two years.