11 Tips for Planning a Downstairs Bathroom

Planning a downstairs bathroom? From finding room for a toilet to choosing the right fittings, these downstairs bathroom ideas will help you make the most of it.

That cupboard beneath the stairs might currently be home to the hoover, several carrier bags and, if you're the Dursleys, a young wizard. But it could make a rather handy downstairs loo.

Whether you're converting an unused corner of your home or updating an existing cloakroom, a downstairs toilet can make life considerably easier. No more sending guests upstairs or joining the queue for the family bathroom.

Before getting too carried away though, there are a few practical things to sort out. From plumbing and measurements to budgeting and decorating, here's how to plan a downstairs bathroom that looks good and works for everyday life.

How to Plan a Downstairs Toilet Step by Step

Step 1 - Find the Best Location for Your Downstairs Toilet

Under the stairs, beside the kitchen or tucked into a utility room are all potential locations for a downstairs toilet. The best choice is somewhere with enough usable floor space and a practical connection to your existing plumbing.

An under-stairs cupboard is a popular option, particularly when you want to add a cloakroom without changing your home's overall layout.

A cloakroom near the hallway is convenient for guests, while a downstairs toilet intended for someone with reduced mobility needs more careful consideration of access, doorway widths and movement around the room.

Step 2 - Check Your Plumbing and Drainage

Your downstairs toilet needs a suitable connection to the home's drainage system, along with water supplies for the toilet and handwashing basin.

The closer you are to suitable existing drainage, the more straightforward installation may be.

A plumber can assess the location of your soil pipe, the route for new waste pipes and whether the necessary pipe falls can be achieved. If conventional drainage isn't practical, they may discuss alternatives, although these aren't suitable for every installation.

Step 3 - Measure Your Downstairs Bathroom Properly

Measure the room's width, length and ceiling height before choosing any bathroom fittings. You'll also need to account for the door opening, toilet projection and the room required to stand, sit and wash your hands comfortably.

A particularly important consideration with under-stairs bathrooms is the sloping ceiling.

You might have plenty of floor space beneath the stairs, but that doesn't automatically mean there's enough room to stand up after using the toilet.

Make sure you check:

• Headroom: Can you comfortably stand up from the toilet without meeting the underside of the stairs?
• Door Clearance: Can the bathroom door open without hitting the toilet or basin? Would an outward-opening door suit the hallway better?
• Toilet Projection: How far does the toilet extend from the finished wall, including any concealed cistern boxing?
• Basin Depth: Is there enough room to wash your hands without squeezing past the basin?
• Storage Access: Can cupboards and drawers open without blocking the doorway or toilet?

One useful trick is to mark out the proposed fittings on the floor using masking tape. Then walk through the whole routine, from opening the door to washing your hands.

Step 4 - Choose the Right Toilet and Basin

fittings that suit the room's proportions makes a big difference.

There are plenty of cloakroom toilets to choose from, including compact close coupled, back to wall and wall hung designs.

A short-projection toilet can be particularly useful in a narrow cloakroom, giving you more clearance in front of the bowl.

Wall hung toilets also leave the floor visible beneath them, helping a small bathroom feel more open. Just remember that the concealed frame and cistern still need space behind the finished wall.

When choosing from our cloakroom basins, look carefully at the dimensions rather than just the style.

A compact corner basin could make use of an otherwise awkward part of your cloakroom, while a slim wall hung design may leave more room to move past.

Measure the basin's projection as well as its width. A narrow basin that extends too far into the bathroom can still make the layout awkward.

Not sure where to start? Check out our range of cloakroom suites that are perfect for smaller spaces.

Step 5 - Check Building Regulations, Ventilation and Privacy

Adding a downstairs toilet to an existing room usually doesn't require planning permission, although building regulations approval is likely to be needed for new plumbing, drainage, ventilation or other building work.

Extensions, structural alterations and listed buildings may have additional requirements.

Before installation, have your builder or bathroom fitter check the rules that apply to your property, including those covering sanitation, drainage, ventilation and access.

A downstairs toilet without a window will need particular attention to mechanical ventilation. Your installer should confirm the appropriate ventilation provision rather than relying on an open door.

Privacy matters too, especially if the cloakroom opens onto a busy hallway or sits close to the living room.

A solid door, suitable lock and sensible sound insulation can help guests feel comfortable. If there's a window, frosted glass or a suitable blind can provide privacy without sacrificing daylight.

Step 6 - Set Your Budget and Plan the Installation

Budgeting for a downstairs toilet means accounting for the complete installation, not just the cost of a toilet and basin.

When gathering quotes, make sure they cover:

• Plumbing and Drainage: New water supplies, waste connections and any alterations to existing pipes.
• Building Work: Partition walls, doorway changes, plastering and making good.
• Bathroom Fittings: The toilet, basin, taps, wastes and any required frames or cisterns.
• Ventilation and Electrics: Extractor fans, lighting and associated installation.
• Finishing Touches: Flooring, decorating, tiling, mirrors and accessories.
• Contingency: Some extra budget for unexpected work, particularly when converting an older part of the house.

A straightforward conversion might take around one to two weeks, although more extensive work can take longer.

Ask your installer for an itemised quote and a realistic schedule. It's also worth confirming when water supplies may need switching off and whether you'll still be able to use the hallway or adjoining rooms during the work.

Downstairs Bathroom Decorating Ideas

Once you've sorted the practicalities, it's time for the fun part.

A downstairs toilet might be the smallest room in your home, but that doesn't mean it needs to be the least interesting. In fact, having less wall and floor area to decorate can make it a brilliant place to experiment with something a little bolder.

Here are a few downstairs bathroom ideas to get you started.

1. Make a Statement with Wallpaper

A downstairs cloakroom is a lovely place to use the wallpaper you've admired for months but haven't quite dared to put in the living room.

Bold florals, botanical prints and geometric patterns can give an otherwise ordinary little loo plenty of personality.

You could wallpaper the upper walls and use painted panelling below for contrast, keeping the areas around the basin easier to wipe clean. Choose finishes suitable for the room's moisture levels.

Dark colours aren't off limits either. Deep green, navy or burgundy can look gorgeous in a small cloakroom, especially with warm lighting and brass details.

2. Keep a Modern Downstairs Bathroom Simple

Modern downstairs bathroom ideas work particularly well when you want a clean, uncluttered look.

Combine a compact toilet, wall hung basin and simple mirror with restrained colours such as warm white, charcoal or soft beige.

Matt black taps can introduce a striking contrast against white ceramics, while brushed brass taps bring a little warmth.

3. Introduce Traditional Cloakroom Details

A downstairs toilet can be a beautiful place to introduce a little old-fashioned charm.

Think traditional taps, decorative basin shapes, tongue-and-groove panelling and vintage-inspired floor tiles.

You could even choose an ornate mirror or floral wallpaper to make the room feel like a proper little Victorian powder room.

For more period-inspired looks, explore our traditional downstairs toilet ideas.

4. Give Your Bathroom Tiles a Job

Downstairs bathroom tile ideas don't have to involve covering every wall.

A tiled splashback behind the basin can protect against water splashes while bringing colour or pattern to the room. Small metro tiles, decorative patterns and rich glazed finishes all work particularly well.

You can also make the floor the main feature with patterned tiles, keeping the walls relatively simple.

Just make sure you choose products described specifically as ‘floor tiles’, rather than using wall-only tiles because the pattern caught your eye.

5. Make the Cloakroom Comfortable for Guests

A downstairs toilet is often the bathroom your visitors use most, so it's worth thinking about the little things they'll appreciate.

Keep a clean hand towel within easy reach of the basin, make sure there's somewhere obvious to find spare toilet roll and choose a lock that's straightforward to operate.

A small shelf or compact cabinet can keep cleaning products and spare toiletries out of sight.

If the downstairs toilet is also your everyday family cloakroom, you could use the extra storage for cleaning supplies and other household essentials.

Just don't let it become the cupboard of forgotten things all over again.

Can You Turn a Downstairs Toilet into a Full Bathroom?

If you have enough room, you could expand your downstairs toilet into a bathroom with a shower or even a bath.

A downstairs bathroom with a shower is particularly useful for busy families, overnight guests or households planning for changing mobility needs.

A small shower enclosure might fit into a larger utility room conversion, while a walk-in shower could work well if you're extending the house.

However, adding a shower brings several extra practical considerations:

• Shower Space: You'll need enough room for the enclosure, access and comfortable movement around the toilet and basin.
• Drainage: A shower requires appropriate waste drainage, with the floor construction and pipe routes affecting what's possible.
• Waterproofing: Shower areas need suitable waterproofing, while wet rooms require a carefully designed floor and drainage system.
• Ventilation: The additional moisture produced by showering makes effective extraction particularly important.
• Accessibility: If the bathroom is intended for someone with reduced mobility, plan the entrance, shower access and fitting positions around their specific requirements.

A downstairs shower room can also be handy for washing muddy children or rinsing off after gardening, rather than traipsing upstairs with half the garden still attached to your shoes.

If you're considering a full downstairs bathroom, speak to your installer before choosing the fittings. You'll need to establish whether the available room and existing services can accommodate the extra facilities safely and comfortably.

Frequently Asked Questions

Can a Downstairs Toilet Open Directly into a Kitchen?

Yes, in England a downstairs toilet can open directly into a domestic kitchen, provided suitable handwashing facilities are in the toilet room, and the spaces are separated by a door. A separate lobby isn't necessarily required, but your layout must meet the applicable building regulations.

Does Adding a Downstairs Toilet Increase House Value?

A downstairs toilet can make your home more attractive to potential buyers, particularly families looking for the convenience of a second WC. However, the increase in value isn't guaranteed and will depend on the property and quality of the conversion.

Find out more in our guide to how a downstairs toilet can add value to your home.

Can You Install a Downstairs Toilet Without a Window?

Yes, a downstairs toilet doesn't necessarily need a window, provided suitable ventilation is installed to meet the relevant building regulations. Your installer can advise on mechanical extraction and where the ventilation duct should run.

Make the Most of Your Downstairs Bathroom

A downstairs toilet can be a brilliant addition to your home, whether you're making use of an under-stairs cupboard or creating a brand-new cloakroom.

Get the plumbing, measurements and layout right first, then have a little fun with the decorating. With some careful planning, even the smallest downstairs loo can become one of the handiest rooms in the house.