# 15x30 inground pool: size, cost and what it looks like

Updated 2026-10-10.

A 15x30 inground pool is 450 square feet of water with 90 feet of edge, and holds about 15,100 gallons at a 4.5 foot average depth. It is the middle of the family range, 3.8 fence panels long. The pool alone runs $40,000 to $115,000 at national planning rates.

## A 15x30 sits in the middle of the family range, and nothing in it feels cramped

Fifteen by thirty is the round-number family pool: 3.8 fence panels long and 1.9 wide. There is room to swim a length, a shallow ledge, and an end where kids can stand and play.

Both pictures are AI concept images of a pool in the 15x30 range, not measured drawings. One puts the pool in front of a white two-story house with a spa and a sun shelf; the other beside a hot tub on a deck with an ocean view. For true proportions use the scale plan on this page: thirty feet is long, and with deck on all sides it takes real yard.

## A 15x30 is 58 square feet bigger than a 14x28

Step up from the 14x28 and you add 58 square feet of water and 1,900 gallons. That buys another few feet of swim and space for a [spa](https://rendersplash.com/pool-features#spa) or a [sun shelf](https://rendersplash.com/pool-features#sun-shelf) alongside. Step up again to a 16x32 and the gain is similar, so the 15x30 is a sensible place to stop for most yards.

The yard sets the limit. One pool maker suggests keeping a pool to no more than about a quarter of the yard, which puts a 15x30 in a yard of about 1,800 square feet, before the deck and the fence. Mark the outline on the lawn before you commit.

Depth is the other half of the decision. Size guides give a shallow end of three to four feet and a deep end of five to six, so a 4.5 foot average is the fair middle, and a pool with a long shallow shelf holds fewer gallons than the figure above while one that is deep all the way holds more. Ask the builder for the depth profile, not only the outline.

If you are comparing it with a 12x24, the comparison page draws both outlines to one scale.

## Two quotes for the same 15x30 can differ a lot, and what is included explains most of it

Two quotes for the same size can differ by the spa, the finish and the deck, so a 15x30 with a spa, a pebble finish and a salt-finish deck is a different job from a plain one.

The table prices the pool alone, then each extra line, so you can see which lines your quote includes and which it leaves for you to buy later. Features such as a spa or a vanishing edge move the total a lot, and the cost page lists [what pushes the price up](https://rendersplash.com/inground-pool-cost#what-adds-cost).

## What a 15x30 inground pool costs, line by line

| Line | Planning range | How it is worked out |
|---|---|---|
| The pool | $41,000 to $113,000 | 450 sq ft of water at $90 to $250 a square foot (shell, excavation, plumbing, equipment, plaster). |
| Coping | $500 to $5,000 | 90 linear ft of water edge at $6 to $55 a foot, from plain concrete to travertine. |
| A 4 ft deck border all round | $1,500 to $34,000 | 424 sq ft at $3 to $80 a square foot installed, from pavers to composite decking. |
| Aluminum pool fence around that deck | $2,000 to $4,500 | 122 linear ft at $15 to $35 a foot installed. |
| All of the above, if your quote includes it | $45,000 to $160,000 | Rounded |

## Questions people ask

**How many gallons is a 15x30 pool?** About 15,100 gallons at a 4.5 foot average depth. At a 4 foot average it is about 13,500 gallons, and at 5 feet about 16,800.

**Is a 15x30 pool the same as a 15x30 above-ground pool?** No. A 15x30 is also a common above-ground oval size, and the two cost very differently. This page is about the inground rectangle, dug into the ground and finished with plaster, tile or a liner.

**How much does a 15x30 inground pool cost?** At national planning rates, the pool alone comes to $40,000 to $115,000, and with coping, a four foot deck border and a fence the range reaches $45,000 to $160,000. The [cost page](https://rendersplash.com/inground-pool-cost#line-items) breaks the lines down.

## Sources and date checked

Links checked 2026-10-06. A planning range from published sources, not a quote.

- [The California Pool & Spa Atelier, a California pool builder, swimming pool size chart, 2026](https://thecpsa.org/blog/swimming-pool-size-chart/)
- [Pool Research, pool volume, undated](https://poolresearch.com/pool-volume-calculator/)
- [Latham Pool, how small is too small, 2024](https://www.lathampool.com/blog/research/how-small-of-a-pool-is-too-small/)
- [HomeAdvisor, in-ground pool cost, 2026](https://www.homeadvisor.com/cost/swimming-pools-hot-tubs-and-saunas/inground-pool)
- [Fixr, gunite and concrete pool, 2025](https://www.fixr.com/costs/inground-gunite-concrete-swimming-pool)
- [Pool Research, plunge pool cost, undated](https://poolresearch.com/plunge-pool-cost/)
- [Pool Research, pool coping cost, 2026](https://poolresearch.com/coping-cost/)
- [HomeAdvisor, travertine pavers, 2026](https://www.homeadvisor.com/cost/outdoor-living/travertine-pavers-install/)
- [HomeAdvisor, pool deck cost, 2026](https://www.homeadvisor.com/cost/swimming-pools-hot-tubs-and-saunas/pool-deck)
- [Fixr, pool fence, 2025](https://www.fixr.com/costs/swimming-pool-fence)

Every picture on these pages is an AI concept image, not a built pool, and its proportions are not measured. Where a size has no picture of its own we show the closest one and say so in the text. Cost ranges are planning numbers from published guides at national rates, not quotes.

Pricing the whole job? See [inground pool cost, line by line](https://rendersplash.com/inground-pool-cost#line-items).

Will a 15x30 fit your yard? Try it in the planner: https://rendersplash.com/pool-sizes?s=15x30#size-planner

See a 15x30 in your own yard with the free visualizer: https://rendersplash.com/pool-visualizer