How to Hide Pipes Behind Toilet

Exposed soil pipes, supply pipes, and overflow pipes around a toilet are one of the most common bathroom eyesores. Fortunately, there are several practical ways to hide them, ranging from a simple boxed-in casing you can build in a day to a full wall-hung toilet installation that eliminates all visible pipework permanently. Which approach is right for you depends on your budget, bathroom layout, and how much disruption you are willing to take on.

Option 1: Boxing In With a Stud Frame

The most popular and affordable solution is to build a stud frame around the pipes and clad it in moisture-resistant board or pre-finished panels.

How It Works

A lightweight timber or metal stud frame is fixed to the floor and wall around the pipe run. The frame is then clad in 12.5 mm moisture-resistant (MR) plasterboard for tiling, or in pre-finished bathroom panels (PVC cladding or waterproof MDF) for a paint-ready finish.

What You’ll Need

• 47 mm x 47 mm C16 timber studs or 50 mm metal C-stud track
• 12.5 mm MR plasterboard (green board) or pre-finished PVC wall panel
• Screws, drywall screws, screw anchors for fixing to tile/brick
• Flexible sealant (sanitary silicone)
• Access panel (if the pipes need periodic inspection, e.g., if there is a solvent-weld joint behind the boxing)

Step-by-Step

1. Mark out the boxing, identify the widest pipe run and allow 20–30 mm clearance around it. The boxing should be as shallow as possible to minimise the space it takes.
2. Fix a sole plate to the floor and a head plate above (if running up to a shelf or ceiling). Use a spirit level to ensure they are plumb.
3. Build side returns where the boxing meets the wall, fixing studs with appropriate wall fixings for your wall type (plastic plugs and screws for solid masonry, timber fixings into stud locations for studwork walls).
4. Fix the cladding, for plasterboard, use drywall screws at 150 mm centres; for PVC panels, use the manufacturer’s adhesive or the panel’s own clip system.
5. Seal all edges with sanitary silicone between the boxing and floor/wall.
6. Install an access panel (a flush-fitting hatch, available for £15–£40 from plumbers’ merchants) if there are any joints, valves, or connections behind the boxing that may need future access.

Cost

The DIY total counts the plasterboard or the PVC panels, not both. At Selco, a 2400 × 1200 × 12.5 mm moisture-resistant board costs £23.86 inc. VAT.¹

Option 2: Pre-Made Pipe Boxing (PVC Extrusion)

For a single pipe run against a wall rather than a full corner boxing, snap-on PVC pipe boxing is the quickest solution. These are pre-formed plastic channels in standard sizes (typically 100 mm x 50 mm, 130 mm x 80 mm) that clip over the pipe and fix to the wall.

• Cost: £5–£15 per metre
• Suitable for: Single supply pipes, 15 mm or 22 mm diameter
• Not suitable for: 110 mm soil pipes (too large for standard clip boxing)
• Finish: Available in white or chrome-effect; can be painted

PVC pipe boxing is not waterproof at the joints so is best used in dry areas, or sealed with silicone if near the toilet.

Option 3: Wall-Hung Toilet With Concealed Cistern

The cleanest solution, and the one increasingly standard in new UK bathrooms, is a wall-hung toilet with the cistern concealed in a purpose-built frame (called an in-wall carrier frame or concealed cistern unit) built into a false wall.

The carrier frame holds the cistern, flush mechanism, and waste pipe connection, all hidden behind a plasterboard face wall. The toilet bowl hangs from the frame at a comfortable height.

Benefits

• No exposed pipes at all, supply, waste, and overflow are all hidden
• Easier to clean underneath (floor-mounted toilet contact area eliminated)
• Height-adjustable during installation (useful for accessibility)
• Modern look compatible with all tile and panel finishes

Drawbacks

• Significant upfront cost (see below)
• Reduces bathroom depth by roughly 120–200 mm: Ideal Standard’s ProSys concealed cistern, for example, is 150 mm deep, and the plasterboard and tiles add to that.²
• Future access to the cistern is via the flush actuator panel, more complex if the cistern develops a fault

Cost

For reference, Toolstation lists Ideal Standard’s ProSys WC frame with a 150 mm in-wall cistern at £287.99 inc. VAT.²

Option 4: Furniture and Decorative Screening

For renters or those not wanting permanent works, a toilet storage unit, freestanding cabinet, or decorative wicker basket screen can visually reduce the prominence of exposed pipes without any construction. This is not watertight or permanent but costs as little as £30–£80 for a suitable bathroom storage unit.

Building Regulations Considerations

Boxing in pipes is not a notifiable building works activity in England and does not require Building Control sign-off. However:

• Access panels are required wherever there are joints or valves on the water supply pipes behind the boxing: the Water Supply (Water Fittings) Regulations 1999 do not allow a joint, or a fitting that has to be operated or maintained, to be concealed where it cannot be reached.³
• Soil and waste pipes must stay reachable: Part H of the Building Regulations asks for rodding points on any length of pipe that cannot be cleared another way, and for all pipes to be reasonably accessible for repair, so never seal a rodding eye or access fitting permanently behind the boxing.⁴
• Fire-stopping: if the pipes and boxing pass through a fire-separating floor (e.g., in a flat), the opening must be fire-stopped, typically with a tested proprietary seal such as an intumescent pipe collar.⁵

Which Option Is Right for You?

For most homeowners doing a partial bathroom refresh, stud-frame boxing in moisture-resistant board is the best balance of cost, durability, and flexibility. It is a realistic DIY project for a confident builder; if you are tiling the face, a tiler will often incorporate the boxing into their scope.