Last Updated on October 20, 2026 by Umar Farooq
Outdoor shower pavers make a firm, clean floor, but they only work if the water has somewhere to go, because pavers alone do not drain a shower. Use a compacted stone base, a gentle fall, and either a gravel margin or a drain pipe that carries the water away from the house. Skip any one of those and the pavers sit in a puddle. Below: how to build the pad, whether permeable pavers help, and the soap and permit questions that decide what you can legally do with the runoff. For the full picture, see paver patio permit.
Why outdoor shower pavers need a real drain
A shower sends a lot of water to one small spot, every day it's used. The Houzz guide I read puts the problem simply: an outdoor shower turns muddy without drainage, and its fix is a wide base, pavers set in the middle to stand on, and draining aggregate around them out to the edges so the water soaks away instead of pooling. It suggests excavating around 400 millimetres (about 16 inches) so there is room for road base, then compacting it before laying pavers.
This Old House points out the part that surprises people: proper drainage for an outdoor shower is often a code requirement, and a contractor quoted there says many showers violate code by draining straight into sand. So there are two reasons to build the drain properly. One is mud. The other is an inspector.
Build the pad: stone first, then pavers
A shower pad is a small patio with a drain, so the base follows the same logic as any other paver base. ICPI Tech Spec 2 calls for at least 4 inches of compacted base under pedestrian areas on well-drained soil, plus 2 to 4 inches more on wet or weak soil, and a surface slope of at least 1.5%. Belgard's technical guide asks for at least 2% to a drainage feature. Build to 2%. We have a separate page on paver pad for generator if you need the specifics.
A workable sequence for a shower pad:
- Call 811 a few days before you dig, and mark where the supply line will run.
- Excavate the pad, the gravel margin and the drain trench together, and keep the whole thing sloping away from the house.
- Compact the stone base in thin lifts. ICPI's 4 to 6 inch lifts assume a 7,000 lbf plate, so use thinner lifts with a smaller rental plate.
- Screed about 1 inch of bedding sand and lay the pavers with a fall toward the drain, not toward the house.
- Leave a gravel margin around the paver pad, so there is a soak-away at the edge of the surface.
The pavers are only the floor. The base and the drain are the shower. That's the same story as every patio on this site, but here the water makes it louder.
A drain trench or a gravel pit
The This Old House project is the best-documented version I found of what happens to the water afterwards. It used an underground drainage pipe, because the yard sloped away from the house, and left a drywell as the alternative. The project's numbers, which are one job and not a code:
- A trench about 2 feet wide and 18 inches deep.
- 6 inches of crushed stone in the bottom.
- 4-inch perforated pipe wrapped in non-woven geotextile fabric, pitched slightly away from the house.
- About 2 inches of crushed stone over the pipe, then landscape fabric and soil.
- An outlet about 30 feet from the house.
- About 10 inches of gravel in the shower enclosure itself.
If the soil is sandy and the shower is used lightly, a gravel pit under the margin may be enough. If you have clay or a high water table, the water won't soak in, so you need a pipe and an outlet. One plumbing contractor's guide lists the options as ground absorption, a gravel bed, a dry well or a French drain, and its first rule is to always direct drainage away from the foundation and basement. Our patio drainage guide goes through swales and outlets in more detail.
Permeable pavers or solid pavers with a fall?
Both work. The Houzz article names the choice: a permeable paver that drains through its joints, or a solid paver laid with a gentle fall. The joints and base are what differ.
Permeable systems use an open-graded build. The CMHA permeable guide specification calls for a No. 8 stone bedding layer 2 inches deep, over a No. 57 base 4 inches deep, over a No. 2 subbase. The joints are filled with clean stone, not sand, which would clog. Our guide to permeable concrete pavers explains the layers.
For a shower the trade-off is soap. A permeable pad sends shampoo into the soil under your feet, and some municipalities restrict greywater containing soap from draining into the ground. That makes a solid paver with a fall to a proper drain easier to defend, and easier to clean. If you use permeable pavers, use unscented, soap-free rinsing and ask your local office first.
Check soap, permits and winter before you pour stone
None of this is covered by a national outdoor-shower code, and the plumbing contractor I read says as much: rules are local. What is common:
- Permits. Permanent plumbing, hot water, sewer connections and structures over about six feet usually need one. A freestanding cold-water unit on a hose bib usually doesn't. That guide puts permit costs at roughly $50 to $200.
- Soap. If you use soap or shampoo, local rules may require a sewer connection. Confirm before you drain it into the ground.
- Backflow. A backflow prevention device on the supply is a code requirement in most jurisdictions, to keep outdoor water out of the house supply.
- Winter. Water left in exposed pipes will freeze and split them. Shut off the supply, drain the line and leave the valve open. Pavers don't mind frost, but the plumbing does.
Because pavers are involved, one more thing to check: which paver. A smooth, polished surface and a wet foot don't mix. Look at slip-resistant pavers before choosing a texture.
Build the drain first and lay the pavers last
Outdoor shower pavers are the easy part. The decision that counts is where the water goes: a pipe to an outlet if the soil is heavy, a gravel margin if it drains, and a conversation with your building department either way. Lay a compacted base with a 2% fall, keep the water away from the foundation, and the pavers will outlast the shower head. Buy the cheaper, simpler thing first: a freestanding cold-water unit with a gravel pad often does the job before you commit to a plumbed shower.
FAQ
What is the best base for an outdoor shower?
A compacted crushed-stone base under the pavers, with a gravel margin or perforated drain pipe beside it. ICPI's base minimum for pedestrian areas is at least 4 inches on well-drained soil, with more on wet or weak soil.
Do you need a drain for an outdoor shower?
In most cases, yes. Drainage is often a code requirement, and draining into sand is a common violation. Where the soil is sandy and the use is light, a gravel pit may be accepted locally, so ask.
Can you use pavers for an outdoor shower floor?
Yes. Use a compacted base, a fall of 2% toward the drain and a non-slip surface. Permeable pavers are an option, though soap rules can make a solid pad with a drain simpler.
Does an outdoor shower need a permit?
Permanent plumbing, hot water or a sewer connection usually does. A freestanding cold-water unit on a hose bib usually doesn't. Check with your local building department.
Can shower water drain onto the lawn?
Sometimes. Some municipalities restrict greywater containing soap or shampoo from draining into the ground, so confirm local rules before you decide.
