What Size Swimming Pool is Best for Your Garden?

Alex Price
What Size Swimming Pool is Best for Your Garden? - OutdoorToys

A garden swimming pool sounds like a brilliant idea… until you start comparing all the sizes.

Do you go for something compact that the kids can splash about in after school? Or a bigger pool with enough room for adults to cool off, too? And how much space do you actually need around it once the ladder, cover, filter pump, and garden furniture are all in the mix?

The best option isn’t always the biggest one. The right swimming pool size is one that fits your garden comfortably, suits your children's ages, and feels easy enough to use throughout summer rather than becoming another thing to clean, cover, and worry about.

In this guide, we’ll walk through the most common swimming pool sizes, how much space to leave around them, and which pool shapes work best for different gardens.

Swimming pool sizes at a glance

Here’s a simple guide to help you compare common garden swimming pool sizes before you buy.

Pool size Best for Garden space needed Good example
10ft Small gardens, younger kids, first-time buyers Compact gardens or patios (around 200–500 sq ft) with clear space around the pool Avenli 10ft x 6.8ft Rectangular Pool – £199.95
12ft–13ft Growing families, more splash space Small to medium gardens (around 500–1,000 sq ft) Avenli 13ft x 6.8ft Rectangular Pool – £249.95
14ft–16ft Families who want room for kids and adults Medium gardens (around 1,000–2,000 sq ft) Avenli 14ft x 9ft Oval Pool – £649.95
18ft Busy family gardens, older kids, entertaining Medium to large gardens (around 2,000–3,500 sq ft) Bestway Steel Pro Max 18ft x 9ft Pool – £1,199.95
20ft+ Big gardens, confident swimmers, summer gatherings Large gardens (3,500 sq ft+) with plenty of clearance Avenli 20ft x 12ft Oval Pool – £849.95

 

Note: These garden-size ranges act as a rough guide. The shape of your outdoor space matters just as much as square footage, so always measure the exact area where you want the pool to sit and leave safe clearance around the edges.

As a general rule, bigger pools give you more room to swim and relax, but they also need more water, more maintenance, and more garden space. So before you jump straight to the biggest option, it’s worth thinking about how your family will actually use it.

How much space do you need for a garden pool?

The pool size itself is only part of the equation. You also need space around it.

A pool might technically fit in your garden, but if it’s pushed right up against a fence, wall, shed, or patio furniture, it won’t feel practical or safe.

As a rough guide, allow at least 2–3ft of clear space around the pool where possible. This gives you room for:

  • Safe entry and exit

  • A pool ladder

  • Adults supervising children

  • Cleaning and maintenance

  • Pool covers and accessories

  • Moving around without squeezing past the frame

If you’re choosing a larger above-ground swimming pool, you’ll also want to think about where the filter pump will sit and how easy it will be to drain the pool at the end of the season.

A flat, level area is essential. Grass, patio, or decking can all work depending on the pool, but the ground needs to be stable, even, and free from sharp stones or debris.

→ Browse above-ground swimming pools at outdoortoys

Small pool sizes: best for compact gardens and younger kids

A smaller pool is often the smartest place to start if you have young children, limited space, or you’re buying your first garden pool.

The Avenli 10ft x 6.8ft Rectangular Steel Frame Pool is a great example. At £199.95, it gives families a proper steel frame pool without taking over the entire garden.

A smaller pool is ideal if you want:

  • Quick setup

  • Easier maintenance

  • Lower water use

  • A manageable size for younger children

  • More space left in the garden for other toys

Smaller pools are also easier to heat naturally in the sun, quicker to clean, and less intimidating for children who are still building confidence in the water.

If your main goal is paddling, splashing, and cooling off on warm days, you probably don’t need a huge pool. A compact rectangular pool can still feel exciting for kids while being much easier for parents to manage.

For toddlers or very young children, you might also want to explore paddling pools, which are shallower, easier to set up, and better suited to gentle supervised water play.

→ Explore paddling pools

Medium pool sizes: best for growing families

Medium-sized swimming pools are usually the sweet spot for many UK families.

They offer enough room for children to properly splash, float, and play, but they don’t require the same level of space as a 20ft pool.

Good examples include:

The Avenli 14ft x 9ft oval pool is especially useful for family gardens because its oval shape provides more usable swimming space while still fitting neatly into narrower outdoor areas.

Medium pools are best if:

  • You have more than one child

  • Adults want to use the pool too

  • You want space for pool inflatables

  • Your garden can handle a pool plus clearance space

  • You want something that will last beyond one summer

This is where above-ground pools really come into their own. They feel much more substantial than a paddling pool, but they’re still far more flexible than an in-ground pool.

Large pool sizes: best for bigger gardens and older kids

If you’ve got the space, a large above-ground pool can turn your garden into the place everyone wants to be during summer.

Larger options include:

These larger pool sizes work well for older children, teens, confident swimmers, and families who enjoy entertaining.

They give you enough room for:

  • Swimming short lengths

  • Floating and relaxing

  • Playing pool games

  • Multiple children using the pool at once

  • Adults joining in comfortably

The trade-off is that bigger pools need more planning. You’ll need enough clear space, more water, and more time for setup and maintenance. They’re brilliant if you’ll use them regularly, but probably more than you need for occasional toddler splashing.

→ Shop steel frame pools

Does pool depth matter?

Yes, and it’s just as important as length and width.

A pool might look like the right size from above, but the depth determines who it’s best suited to.

Shallow pools

Shallower pools are better for younger children and paddling. They’re easier to supervise and feel more approachable for little ones.

Mid-depth pools

Pools around 30–40 inches deep are a good middle ground for families. They offer enough water for older children to play properly while still being manageable for everyday use.

Deeper pools

Pools around 48 inches and above are better suited to older children, teens, and adults. They give a more proper swimming pool feel but require confident swimmers and close supervision.

No matter the depth, children should always be supervised in and around water.

Rectangular, oval, or round: which pool shape is best?

Pool shape can make a big difference to how well it fits your garden.

Rectangular pools

Rectangular pools are great for patios, narrow lawns, and gardens where you want a clean, space-saving shape. They’re also useful if kids want to swim short lengths or play games.

Oval pools

Oval pools are a brilliant choice for families because they offer generous swimming space without feeling as wide as some round pools. They’re often a good fit for UK gardens where space is limited, but you still want a roomy setup.

Round pools

Round pools can be great for casual splashing and younger kids, but they don’t always make the best use of narrow garden layouts.

If you’re unsure, measure your available space and mark it out with string before buying. It’s much easier to picture the pool when you can physically see how much room it will take up.

Don’t forget space for accessories

The pool is the main event, but accessories make summer much easier.

Depending on your pool, you may want:

  • A pool cover

  • A filter cartridge

  • A repair kit

  • A ladder

  • Pool inflatables

  • Armbands or swim aids

  • A sun canopy

  • Water games

outdoortoys stocks plenty of covers, filters & accessories, including Bestway Flowclear pool covers, repair patches, filter cartridges, and inflatable pool games.

If you’re creating a full summer setup, pool inflatables are an easy way to keep kids entertained once the pool is up. For extra garden fun, you can also add inflatable water slides or a slip and slide alongside your pool.

What size pool is best for your family?

Here’s the easiest way to decide.

Choose a small pool if:

  • You have a compact garden

  • You have younger children

  • You want easy setup and storage

  • You’re buying your first pool

  • You want something low-maintenance

A 10ft pool is a great starting point.

Choose a medium pool if:

  • You have a growing family

  • Adults want to use it too

  • You want space for inflatables

  • You’ll use it regularly in summer

  • You want the best balance of size and practicality

A 13ft–16ft pool is often the safest choice for many families.

Choose a large pool if:

  • You have a big garden

  • You have older children or teens

  • You want room for swimming

  • You entertain family and friends

  • You’re happy with more maintenance

An 18ft–20ft pool can feel like a proper garden swimming pool.

Alex McMullan, Product Desginer at outdoortoys, says:

“When choosing a swimming pool size, the biggest mistake families make is focusing only on the pool dimensions and forgetting about the space around it. You need enough room to move safely, use the ladder properly, and supervise children comfortably.

“It’s also worth being honest about how you’ll use the pool. If it’s mainly for younger children to splash and cool off, a smaller or mid-sized pool can be perfect. If older kids or adults want to swim, relax, and use inflatables, it may be worth sizing up.

“Above-ground pools are a brilliant option for UK gardens because they give families flexibility. You can choose a size that suits your space now, without committing to a permanent installation.”

Make the most of summer with outdoortoys

Choosing the right swimming pool size makes all the difference. Too small, and kids may outgrow it quickly. Too big, and it can become harder to manage than you expected.

The sweet spot is a pool that fits your garden comfortably, suits your child’s age and confidence, and feels easy enough to use again and again.

At outdoortoys, you’ll find above-ground swimming pools in a range of sizes, along with paddling pools, pool inflatables, and essential pool accessories to help you build the perfect summer setup.

Or, if you’re planning a full garden refresh, you can explore swings, climbing frames, garden toys, and more ways to keep kids playing outside all season long.