9 x 4 m rounded rectangle pool
pool plan
A full family pool: a shallow end where kids stand and games happen, a proper deep end for diving-free swimming, and enough length that two people can swim without negotiating. This is the most-built size class in private gardens for a reason.
A rounded rectangle keeps almost all of the rectangle's swimmable water but rounds the corners into generous fillets. The result reads softer in a garden, is gentler on swimmers, and the corners no longer trap debris the way sharp ones do. It's the shape we default to in the designer.
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9 × 4 m — shown to scale
The numbers, computed
- Water surface
- 381 sq ft
- Water volume
- 12,628 gal (52.7 tons)
- Perimeter
- 80′ 6″
- Depth
- 3′ 11″–5′ 11″
- Excavation approx.
- 105 cu yd
- Fill time (garden tap)
- 32 hours
- Skimmers needed
- 2×
- Heat pump size
- 58,000 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 | €31,000–€54,000 | Over a block or concrete shell; the least expensive route to any shape. |
| Tiled concrete | €48,000–€79,000 | A poured shell finished in tile; built to any shape, the most durable finish. |
| One-piece fiberglass | €28,000–€48,000 | 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 9 × 4 m pool hold?
- About 12,628 gal (52.7 tons of water) at 3′ 11″–5′ 11″ depth — computed from the actual pool outline, not a rule of thumb.
- How long does it take to fill?
- Roughly 32 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 381 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 9 × 4 m rounded rectangle pool cost to build?
- Roughly €28,000 to €79,000 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.
Similar pool plans
8 × 4 m · Rounded rectangle
Family pool11,175 gal · 338 sq ft
10 × 4 m · Rounded rectangle
Family pool14,121 gal · 424 sq ft
9 × 4.5 m · Rounded rectangle
Family pool14,143 gal · 427 sq ft
9 × 4 m · Rectangular
Family pool13,008 gal · 388 sq ft
8 × 4.5 m · Oval
Family pool10,284 gal · 303 sq ft
Ø 6 m · Round
Family pool9,877 gal · 303 sq ft
Go on — put a pool in your garden.
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