18 x 36 ft oval pool
pool plan
An estate-class pool: resort presence at home, with room for swimming, play and lounging at the same time. At this size the supporting decisions matter as much as the basin — plan generous decks, a solid heat source and an automatic cover from day one, because every square metre of water is heated, treated and covered.
The oval trades corners for one continuous curve. It sits beautifully in planted, informal gardens and among period houses, and the long axis still gives a proper swimming line. Circulation is excellent because there are no corners at all for water to stall in.
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18 × 36 ft — shown to scale
The numbers, computed
- Water surface
- 507 sq ft
- Water volume
- 17,369 gal (72.5 tons)
- Perimeter
- 87′ 1″
- Depth
- 3′ 11″–6′ 7″
- Excavation approx.
- 144 cu yd
- Fill time (garden tap)
- 44 hours
- Skimmers needed
- 2×
- Heat pump size
- 82,000 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.
Also in metric sizes: 10 × 5 m
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 |
|---|---|---|
| Vinyl liner | $45,000–$68,000 | Fastest and least expensive; the liner is replaced every 8–12 years. |
| Fiberglass | Not made at this size | One-piece shell, quick install; limited to sizes and shapes a mould exists for. |
| Concrete (gunite) | $71,000–$113,000 | Built to any shape or size; the slowest build and the most upkeep. |
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 18 × 36 ft pool hold?
- About 17,369 gal (72.5 tons of water) at 3′ 11″–6′ 7″ depth — computed from the actual pool outline, not a rule of thumb.
- How long does it take to fill?
- Roughly 44 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 507 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 18 × 36 ft oval pool cost to build?
- Roughly $45,000 to $113,000 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
18 × 36 ft · Rectangular
Estate pool23,353 gal · 648 sq ft
18 × 36 ft · Rounded rectangle
Estate pool22,470 gal · 635 sq ft
18 × 36 ft · Roman
Estate pool20,656 gal · 578 sq ft
18 × 36 ft · Grecian
Estate pool21,720 gal · 611 sq ft
18 × 36 ft · L-shape
Estate pool18,506 gal · 526 sq ft
18 × 36 ft · Lazy L
Estate pool19,906 gal · 592 sq ft
Go on — put a pool in your garden.
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