12 x 4 m rectangular pool
pool plan
A lap-class pool: long, narrow and uniformly deep, built for exercise. The constant depth makes flip turns predictable and halves the excavation surprises; the narrow width keeps volume — and therefore heating — in check for the length you get.
The rectangle is the default for a reason: it gives you the most swimmable water for a given footprint, plays well with modern architecture and lap swimming, and makes covers, solar blankets and automatic cleaners simple. Straight walls also keep formwork and tiling straightforward, which builders appreciate.
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12 × 4 m — shown to scale
The numbers, computed
- Water surface
- 517 sq ft
- Water volume
- 15,470 gal (64.6 tons)
- Perimeter
- 105′
- Depth
- 4′ 5″–4′ 5″
- Excavation approx.
- 133 cu yd
- Fill time (garden tap)
- 39 hours
- Skimmers needed
- 2×
- Heat pump size
- 72,000 BTU/h
Figures are computed from the sampled pool outline and the plan's depths — the same geometry the 3D designer uses. Excavation includes shell and working allowance; your site conditions may differ.
What it costs to build
A rough installed-cost range per construction type, at this size — the pool itself, with basic coping. Not a quote.
| Construction | Installed cost | Note |
|---|---|---|
| Liner or membrane | €38,000–€66,000 | Over a block or concrete shell; the least expensive route to any shape. |
| Tiled concrete | €59,000–€98,000 | A poured shell finished in tile; built to any shape, the most durable finish. |
| One-piece fiberglass | €34,000–€59,000 | Fastest to install; limited to sizes and shapes a mould exists for. |
Rough 2026 estimates for the pool installed with basic coping — excavation, shell and basic equipment. Excludes deck, fencing, landscaping, heating and permits, all of which vary by site and by builder; get real bids before budgeting from these figures.
Questions about this plan
- How much water does the 12 × 4 m pool hold?
- About 15,470 gal (64.6 tons of water) at 4′ 5″–4′ 5″ depth — computed from the actual pool outline, not a rule of thumb.
- How long does it take to fill?
- Roughly 39 hours from a standard garden tap (~6.6 GPM). A water delivery service fills it in a few hours.
- Is this size right for my garden?
- The water surface is 517 sq ft; plan roughly 1.5–2× that footprint including the surrounding deck. Open the plan in the designer and set your own deck margins to see the full footprint.
- Can I change the depth or edge type?
- Yes — open the plan in the designer and adjust depths, edge system (skimmer, deck-level overflow or raised), finishes and accessories freely.
- How much does the 12 × 4 m rectangular pool cost to build?
- Roughly €34,000 to €98,000 installed at this size, depending on construction type — before deck, fence, landscaping, heating or permits. See the cost table above for the range per type.
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Go on — put a pool in your garden.
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