How Much Is The Cost of Garden Room with Shower and Toilet in the UK?

A garden room isn’t just an extra space for hobbies, work, or relaxation anymore. With the right design and construction, it can now function as a fully equipped living space, complete with a shower, toilet, and everything you’d expect from a well-built room inside your home.

As more UK homeowners look for flexible, multi-purpose spaces, garden rooms with full amenities are becoming an increasingly popular choice. Whether it’s for guests or a private retreat, having a functional bathroom takes the space to an entirely new level of comfort and usability.

But naturally, the next question is: How much does it cost to build a garden room with a shower and toilet in the UK?

In this guide, we'll go through the key cost factors of building one and introduce JML Garden Rooms as a trusted provider of SIPs rooms in Scotland and the UK.

Let’s get started!

How Much Is the Cost of a Garden Room with Shower and Toilet in the UK?

A garden room with a shower and toilet in the UK typically costs between £20,000 and £38,000. The final cost still depends on factors such as the size of the building, the quality of materials used, and the complexity of plumbing and electrical installations.

Elements like drainage, insulation, heating, and interior finishes also influence the overall cost. Adding a bathroom turns a simple garden room into a fully functional living space, so it needs a higher level of workmanship and compliance with regulations.

Why Choose a Garden Room with a Shower and Toilet?

A garden room with its own shower and toilet opens up far more possibilities than a standard outdoor workspace. With full bathroom facilities in place, your garden building becomes a versatile space that you can use as a private home office. a comfortable guest room, or even a glamping pod if you plan to use it as paid accommodation.

Here’s why more homeowners are choosing this setup:

Increased convenience & functionality

With a bathroom on-site, you don't need to walk back and forth to your main house. This makes the space far more practical for everyday use, long work hours, visiting guests, or overnight stays.

Adds independence for users

A fully equipped garden room offers privacy and autonomy, which is ideal for guests, older relatives, or remote workers.

Energy efficient

Modern, well-insulated builds guarantee year-round comfort while keeping energy costs low. This means your garden room remains warm, efficient, and cost-effective, regardless of the season.

Cost Breakdown: What You’re Paying For

Knowing what goes into your investment is important when considering a garden room. At JML Garden Rooms, we build and customise each space according to your needs.

So, if you want a garden room with a shower and toilet, we have several ranges that can accommodate this, depending on your layout, size, and intended use.

Our garden rooms with shower & toilet options

Lowlander (from £40,000 – complete with turnkey solution)

Ideal for use as a compact guest suite, our team can integrate a complete shower room even within this smaller footprint.

You can check out our Bespoke Lowlander project in Forteviot, where we created a garden guest room for a newly completed self-build home. The project included a beautifully designed walk-in shower room and coordinated interior finishes and fixtures to match the aesthetic of the client’s main house.

Garden Bothy (from £32,000)

Our Garden Bothy is a versatile option perfect as a spare room, writer’s retreat, or glamping pod.

Bothy Annexe (from £120,000)

Our larger annexe-style build, offering multiple rooms and generous internal space.

See our Bespoke Bothy Annexe project at Loch Fyne, where we designed a multifunctional building that can be used as an office or additional accommodation for family and friends.

This garden room features a mezzanine office, a ground-floor games room with a kitchenette, and a stylish shower room.

What’s included in your JML Garden Room investment

Every JML build, whether small or large, comes with premium specifications to ensure durability, comfort, efficiency, and long-term value:

• Ground screw foundation system
• Highly insulated SIP panel wall, floor, and roof structure
• Factory-finished double-glazed timber door system, fixed sidelights, and top swing window
• Engineered oak flooring
• MDF painted skirting
• Fully plastered walls, decorated in the colour of your choice
• Internal and external LED lightings
• RCD breaker for safe, compliant electrics
• Full erection and installation works

Ready to Build Your Own Garden Room with Shower and Toilet?

A well-designed garden room shouldn’t just look beautiful. It should be functional and comfortable too! At JML Garden Rooms, we combine quality SIP construction and over a decade of experience to deliver high-quality garden rooms that last for a long time.

Whether you’re creating a private guest suite, a workspace, or a luxurious glamping pod, our team can guide you through every step of the process.

If you’re ready to explore your options or want to understand what’s possible within your budget, we’d love to help.

Get in touch with us, and let’s start bringing your vision to life!