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Guides/Indoor school and riding facility
A rider schooling dressage in a light indoor school with tall arched windows and a timber frame.
Guide · Indoor school

Indoor school and riding facility

How to plan an indoor school, outdoor arena and paddock: the right size, surface and drainage, lighting and watering – and what applies to planning permission for a riding facility.

8 min read·Updated July 2026

A well-built surface to ride on lengthens a horse's career and keeps schooling enjoyable all year. Whether you are planning an indoor school, an outdoor arena or a paddock, quality sits in the surface and the drainage. Here we go through sizes, how the layers are built, and what to settle before you start work.

Indoor school or outdoor arena?

An indoor school lets you train in any weather and through every season – but it is a serious investment. An outdoor arena costs less and will take you a long way if the drainage is sound and you can light the dark winter evenings. Many people start with a well-drained outdoor arena and add the indoor school later.

Typical sizes
  • 20 × 40 m – the standard for dressage and all-round schooling
  • 20 × 60 m – for more advanced dressage and larger jumping courses
  • Fit the length to need, plot and budget – the width is rarely worth compromising

Surface and construction

A good surface is built in layers: a stable, draining base and an elastic top layer that cushions and gives grip. The footing – often sand mixed with fibre or other additives – should hold moisture without turning heavy or dusty.

  1. A levelled, compacted subgrade with the right fall
  2. A draining base course that carries water away
  3. A separation or membrane fabric, if needed
  4. An elastic top layer with the right particle size and fibre
Drainage is everything

Most problems with riding surfaces come down to poor drainage. An arena that turns boggy after rain or hard after drought wears on the horse's legs. Put the money into drainage from the start – it is expensive and awkward to put right later.

Lighting and watering

To ride through the year you need even, glare-free lighting – especially through the dark months. A watering system keeps a sand surface just moist enough to bind without kicking up dust.

  • Even, glare-free LED lighting across the whole surface
  • Watering that spreads evenly across the arena
  • Regular harrowing keeps the surface even and open

Paddock and loose housing

A hardstanding, well-drained paddock takes pressure off the grazing and still lets the horse move when the fields are wet. Build it in layers just as you would an arena, and keep the surface clear of droppings to limit wear and parasites.

Planning permission and siting

An indoor school is a large building and normally needs planning permission. Inside a detailed development plan (detaljplan) it is always required. Outside one, an indoor school can, exceptionally, be exempt as an agricultural building – but only if it genuinely belongs to a farm. An indoor school for a stand-alone training or hire business needs permission (see RÅ 2005:53, which concerned a riding hall). Outdoor arenas and paddocks can also need permission, depending on the site, the size and the groundworks. Always check with the municipality first.

Before you build
  • Check whether an indoor school and any larger groundworks need planning permission
  • Look at the detailed development plan, shoreline protection and distances to neighbours
  • Site it with sun, wind, drainage and access in mind
  • Get separate quotes for the building and the surface

Frequently asked questions

What size should an indoor school be?

The usual sizes are 20 × 40 metres for all-round schooling and dressage, and 20 × 60 metres for more advanced dressage or larger jumping courses. The 20-metre width is rarely worth compromising; fit the length to need, plot and budget.

What matters most for a good riding surface?

The drainage. A surface is built in layers, with a draining base and an elastic top layer. Most problems come from poor drainage that leaves the arena boggy in rain or hard in drought. Invest in the base construction from the start.

Do I need planning permission for an indoor school or outdoor arena?

An indoor school normally needs planning permission, and inside a detailed development plan it is always required. Outside one it can, exceptionally, be exempt as an agricultural building – but only if it belongs to a farm. A stand-alone riding business usually still needs permission. Outdoor arenas and paddocks can need permission depending on the site, the size and the groundworks. Always check with the municipality before you start.

Does a sand surface need watering?

Yes. Most sand-based surfaces need to stay just moist enough to bind and not dust. A watering system that spreads evenly, together with regular harrowing, keeps the arena in good order.

Read on

Building a horse property—Stables and box sizes—Buying a horse property

Sources

  • Boverket – What is an agricultural building?
  • Boverket – Agricultural building (new build)