What length of shower drain is suitable for my shower enclosure
What length of linear shower drain is suitable for my shower enclosure?
Selecting the correct length of a linear shower drain is one of those decisions that seems simple at first glance – but in practice, it's surprisingly easy to make mistakes. I've seen projects where people bought a drain that was 10 cm shorter than needed and had to redo the entire slope layer of the floor. I've also seen the opposite case – a drain longer than the width of the bathroom, which the installer tried to "shorten" in an improvised way. Neither scenario is something you want to experience.
This article will help you correctly determine the length of a linear drain for your specific shower – whether you're building from scratch, renovating an existing space, or planning a modern walk-in shower without a bathtub. We'll go through all the key factors: shower dimensions, drain location, waterproofing, slope, connection to the waste system, and of course, aesthetics.
Why the length of the drain is more important than you think
A linear shower drain is not just a drainage element. It is an architectural detail that influences the entire water flow in the shower, the tiling method, the direction of the floor slope, and the visual impression of the entire bathroom space. Unlike a point drain, where water is collected at one point and the slope is created from all four sides, a linear drain directs the entire slope in only one direction – toward the drain. This simplifies the laying of long tile formats, but at the same time places greater emphasis on the correct selection of length.
If the drain is too short, part of the water flows outside its catchment area and accumulates in the corners or along the walls. If it is too long, it interferes with the load-bearing structure, complicates waterproofing, or visually "overgrows" the shower area into the dry zone of the bathroom. The length of the drain must be in line with the dimensions of the shower, the location of the drain, the tile format, and the diameter of the waste pipe.
Basic rule: drain and width of the shower enclosure
The simplest and most reliable rule is: the length of the linear drain should correspond to the width of the shower enclosure (or be 5–10 cm shorter if the drain does not reach both side walls). This applies in the case where the drain is placed along one wall – the most common situation in walk-in solutions and classic shower enclosures.
Examples from practice:
- Shower enclosure 80 × 80 cm → drain 700–800 mm (800 mm if it reaches from wall to wall, 700 mm if it is embedded in the tile)
- Shower enclosure 90 × 90 cm → drain 800–900 mm
- Shower enclosure 100 × 100 cm → drain 900–1000 mm
- Walk-in 120 × 80 cm → drain 1100–1200 mm (along the longer side), or 700–800 mm (along the shorter side)
- Walk-in 140 × 90 cm → drain 1200–1400 mm
This rule applies to so-called full drains – that is, when the drain collects water from the entire width of the shower. If you plan to shorten the drain or place it differently (e.g., diagonally, in the center, or only as a partial drain), the situation becomes more complicated and must be addressed individually with construction experts.
Drain location in the shower enclosure: three basic scenarios
Before selecting the length, you must know where the drain will go. There are three basic positions, and each of them affects the length you need.
1. Drain along the wall (most common option)
The drain is placed along one of the walls of the shower – either along the entrance wall (opposite the water), along a side wall, or along the back wall opposite the door. This is the most common situation in renovations and new builds. Drain length = width of the shower (minus the thickness of the tile on the side walls, which is usually 10–15 mm on each side).
For example: a 90 cm enclosure with 10 mm tile on each side → drain 880 mm, which is practically 900 mm, since the drain is installed before the tile and the tile is applied to it. If you have a choice between 800 mm and 900 mm, you choose 900 mm and adjust the final position during installation.
2. Drain in the center of the shower (less common)
Sometimes the drain is placed not along the wall, but directly in the center of the shower enclosure – especially in situations where you want a symmetrical slope from both sides, or when the enclosure is larger and the shower head is in the center. In this case, the drain can be shorter (covering only the central area), but the slope must be implemented from both sides – a more complex implementation.
3. Drain in the entrance area (walk-in without doors)
In modern walk-in solutions, the drain is often placed directly at the entrance to the shower – it is a visible design element and also functions as a natural barrier that prevents water from spilling into the dry area of the bathroom. Here, the drain must cover the entire width of the entrance. If the entrance is 100 cm, the drain must be at least 900–1000 mm. A shorter drain at the entrance = water on the bathroom floor.
Specific SLEEK Drain Lengths – For Whom Are They Intended?
The SLEEK linear shower drain series is available in several lengths, each designed for specific shower sizes. Let's take a closer look at them.
SLEEK 500 mm – For Small Shower Enclosures
The 500 mm drain is ideal for the smallest shower enclosures – typically 70 × 70 cm or 80 × 80 cm, where space is limited and every centimeter counts. In practice, I most often see it in panel housing bathrooms, where the original bathtub is being renovated into a shower, or in small guest bathrooms.
For an 80 × 80 cm enclosure with a 500 mm drain, it is important that the slope is sufficiently pronounced (at least 1.5–2%), as the shorter drain collects water from a smaller area and must be more efficient. If you are considering this option, take a look at Linear Shower Drain SLEEK 500 mm in black or SLEEK 500 mm in gun grey – both variants are distinguished exclusively by surface finish, functionally they are identical.
Important note for the 500 mm drain: in an 80 × 80 cm enclosure, you must place the drain exactly 10 cm from each side wall (if it is a symmetrical position), or shift the entire drain to one wall and leave the edge free on the other. Both are feasible, but require precise slope measurement even before tiling.
SLEEK 600 mm – A Universal Choice for Standard Showers
The 600 mm drain is among the most popular lengths, and for a good reason: it covers the needs of shower enclosures from 80 × 80 cm (with sufficient reserve) up to 90 × 90 cm. It is the golden middle path – not too short, not unnecessarily long.
If you are building or renovating a 90 × 90 cm shower, a 600 mm drain placed along one wall will cover more than two-thirds of the width. This is acceptable provided the slope is properly done and the water from the outer 15 cm at each wall has a real slope towards the drain. With a proper 2% slope, this is not a problem.
For a 100 × 100 cm enclosure, I would not recommend a 600 mm drain – it is a borderline situation and a longer variant would be better. SLEEK 600 mm in black and SLEEK 600 mm in gun grey are available in both surface finishes, just like the 500 mm variant.
SLEEK 700 mm – For Larger Showers and Walk-in Solutions
The 700 mm drain is suitable for shower enclosures from 90 × 90 cm up to 100 × 100 cm, where you want the certainty that the drain covers the entire or almost the entire width of the space. It is also the minimum length I would recommend for walk-in showers with an open entrance without doors, where the drain serves as a water barrier at the entrance.
SLEEK 700 mm in black is available as one of the top variants in this series. For larger showers (120 cm and more), you will need longer drains from other series – the SLEEK series covers smaller and medium sizes.
Tiling Format and Its Influence on Drain Length Selection
This is a detail that is almost forgotten in every project in practice – and yet it can significantly influence which drain length you choose. If you plan to use long format tiles (e.g. 1200 × 200 mm or 1000 × 200 mm), it is ideal if the drain length is a multiple of the tile width or if the tiles pass without cutting.
Example: you have a 90 × 90 cm shower and want to use 900 × 300 mm tiles. With a properly chosen 600 mm drain and tiling perpendicular to the drain, you will get three rows of tiles leading to the drain – without cutting. If you choose a 700 mm drain and 900 mm tiles, you will have to cut the tiles, which is an unnecessary complication.
Another example: a walk-in shower 120 × 80 cm, tile 120 × 120 cm in one piece → the drain on the shorter side must be 700–800 mm. If you wanted the drain on the longer side, you would need 1100–1200 mm – this is not covered by the SLEEK series and you would need to look for a longer variant.
The rule is simple: first design the tiling format and their laying direction, then choose the drain length so that it minimizes the number of cuts. This coordination will save you not only the cost of cutting, but also unsightly thin strips of tile next to the drain.
Connection to the drain and minimum space requirements
A linear drain means more than just choosing length and color – behind it lies an entire system of connection to the drain pipe. And it is precisely here that practical limitations arise, which can affect where you place the drain and thus also what length you choose.
The drain must be connected to a vertical drain pipe (or horizontal with sufficient slope). The minimum diameter of the drain pipe for a linear drain is DN 50 (50 mm internal diameter). For long drains (from 900 mm), DN 70 or DN 75 is recommended so that the drain can handle a higher water flow. The SLEEK series in lengths of 500–700 mm usually works with DN 50, but always check the technical specifications of the specific product.
It is also important where the trap is located. Most linear drains have a trap at one end (left or right), or in the center. This affects which end of the drain must be closer to the drain pipe. If you are renovating an existing bathroom with a fixed position of the drain pipe, you must align the position of the trap in the drain with the position of the vertical drain – and this can also affect the choice of length or direction of the drain.
Drain slope: how it affects the choice of length
A linear drain covering the entire width of the shower requires a one-way slope. This is elegant and simple – but it has a practical impact on how the drain is sized. The longer the drain (i.e., the larger the shower area), the longer the slope, which at the same slope (e.g., 2 %) means a greater height difference between the far corner and the drain.
For a 90 × 90 cm corner and a 2 % slope, the height difference is 18 mm (0.9 m × 0.02 = 0.018 m = 18 mm). This is a real height that you must consider when building the slope layer and when choosing the thickness of the tiles and adhesive. If you have a limited construction height (e.g., renovation without demolishing the original waterproofing), a shorter drain may be advantageous precisely because the slope layer is thinner.
More about the technique of slope implementation can be found in the article Drain slope for linear drains – how to properly build and tile, where this issue is analyzed in detail including calculations for different corner sizes.
Dimension tables: quick overview for common situations
The following table summarizes recommended drain lengths for the most common shower sizes in everyday practice. The values are calculated with a one-way slope and placement of the drain along one wall.
| Corner size | Recommended drain length | Suitable SLEEK model | Note |
|---|---|---|---|
| 70 × 70 cm | 500–600 mm | SLEEK 500 mm | Small corner, minimum slope of 2 % required |
| 80 × 80 cm | 600–700 mm | SLEEK 600 mm | 500 mm usable, less ideal |
| 90 × 90 cm | 700–800 mm | SLEEK 700 mm | Standard standard corner |
| 100 × 100 cm | 800–1000 mm | SLEEK 700 mm / other series | 700 mm is minimum, 900+ recommended |
| 120 × 80 cm | 700 mm (short side) / 1100 mm (long side) | SLEEK 700 mm (short side) | Walk-in, depends on drain orientation |
| 140 × 90 cm | 900 mm (short side) / 1200+ mm (long side) | Other series | Large walk-in, SLEEK series not sufficient |
Aesthetics vs. functionality: where lies the compromise?
Many customers choose the length of the drain also based on aesthetics – they want the drain to either blend with one wall or, on the contrary, create a striking architectural accent. Both approaches are fine, but they must be in line with functionality.
A shorter drain (e.g., 500 mm in a 90 × 90 cm corner) can look more discreet – it is less noticeable and, if it is black and placed against the wall, it almost blends with the tiling. But it can be risky functionally if the slope is not perfect. A longer drain (700 mm) is visually more prominent, but functionally more reliable.
From an aesthetic point of view, it also makes sense to match the color of the drain with other bathroom elements – the faucet, holders, shelves. If you have a black faucet and black accessories, the logical choice is a black drain. If you prefer an industrial or grey tone, the gun grey variants of the SLEEK series are an excellent alternative. Learn more about this decision in the article Surface finish of a shower drain: black vs. gun grey – what lasts longer.
Mistakes in choosing the length that I have seen in practice
Over the years of working with the installation and sale of bathroom equipment, I have encountered several recurring mistakes. Here are the most common ones:
- Purchasing a drain before verifying the dimensions of the shower on site. A customer chooses a drain based on the planned size of the corner, but on site it turns out that the walls are not straight and the actual width is 4 cm smaller. The drain then either overhangs or is too short.
- Ignoring the thickness of waterproofing and tiling. The final clear width of the shower can be up to 4–6 cm smaller than the rough width of the corner. This must always be taken into account.
- Selecting a drain without considering the position of the trap. The trap must be on the side where the waste pipe is located. If you buy a drain with a left-side trap and the waste is on the right, installation becomes complicated or impossible.
- Underestimating the slope for shorter drains. A shorter drain requires a more precise slope, because any deviation will cause water not to drain into the drain and instead remain on the floor.
- Forgetting about the access opening for the trap. Some drain lengths have the trap accessible only from below – if there is no access to the trap from the bathroom, cleaning is impossible without demolition. Always check how a specific drain is cleaned and maintained – more in the article Cleaning and maintenance of the linear shower drain SLEEK.
Practical steps: how to measure and correctly determine the drain length
If you are just in the decision-making phase, here is a practical procedure I recommend to every customer before ordering:
- Measure the actual dimensions of the shower – not from the project documentation, but directly on site or in the renovated space. Measure at floor level and at 100 cm height (walls may not be vertical).
- Subtract the thickness of waterproofing and tiling – usually 10–15 mm on each wall where tiling is applied. This is the final clear width of the shower.
- Decide on the position of the drain – which wall will it be on? Where is the waste pipe? Where will the drain trap be?
- Check the tile format – match the drain length with the tile format to minimize cuts.
- Select the drain length – ideally, it should be the same as the clear width of the shower (for a drain along the wall). If that is not possible, choose the nearest shorter size and ensure a proper slope.
- Verify compatibility with the waste – diameter, position, trap.
For more on the entire selection process including technical parameters, see the article How to choose a linear shower drain for a shower corner, where all key criteria are analyzed in detail, including materials and flow capacities.
Walk-in showers without a bathtub: a special case when choosing the length
Walk-in corners without a bathtub are extremely popular today – and at the same time, they are situations where most people make the wrong choice when selecting the drain length. The main reason: with an open entrance without doors (or with one fixed glass wall), the drain is not only a drainage element, but also the only barrier preventing water from reaching the bathroom floor.
This means that in a walk-in shower with an open entrance, the drain must be placed at the entrance and its length must cover the entire width of the entrance – without exception. If the entrance is 90 cm and you install a 600 mm drain, you will have 15 cm on each side where water freely flows out of the bathroom. With every shower, this is a load on the floor and a potential source of moisture under the tiles.
I recommend the following for walk-in showers with an open entrance:
– Entrance up to 70 cm: 600–700 mm drain
– Entrance 80–90 cm: 700–900 mm drain
– Entrance 100 cm and more: 900 mm and longer drain
For inspiration and technical solutions for walk-in showers, see the article Integrating a linear drain into a walk-in shower without a bathtub, where other details such as the height of the shower head, selection of the glass wall, and waterproofing solutions are also discussed.
Most frequently asked questions (FAQ)
Can I use a 500 mm drain in a 90 × 90 cm shower corner?
Technically it is possible, but functionally risky. With a 90 cm wide shower and a 500 mm drain, there will be more than 20 cm on each side where water does not directly flow into the drain, but must collect by the slope of the floor. This places exceptionally high demands on the accuracy of the slope. In practice, with a standard slope of 1.5–2 %, water puddles form near the side walls. I recommend a minimum of a 700 mm drain for a 90 × 90 cm corner.
What if my shower corner has non-standard dimensions, e.g. 85 × 95 cm?
In such a case, choose the drain length according to the side along which the drain will be placed. If it is along the 85 cm wall, look for a 700–800 mm drain. If along the 95 cm wall, look for an 800–900 mm drain. Always measure the actual clear width after subtracting tiling and waterproofing. Standard lengths (500, 600, 700 mm) cover most situations with a reasonable margin.
Is it better to choose a longer or shorter drain if I am between two sizes?
In most cases, the rule is: better longer. A longer drain has a larger catchment area, tolerates smaller slope inaccuracies, and catches water even from the edge areas of the shower. A shorter drain requires a more precise slope and any deviation in the floor can lead to standing water and problems. Exception: if a longer drain would encroach on the dry area of the bathroom or on a load-bearing structure.
Can I shorten the drain if the available length is larger than needed?
Some drains allow shortening – but the SLEEK series is not primarily designed for this and shortening could void the warranty or damage the sealing. Always check the product technical documentation before purchase to see if the manufacturer allows shortening. A much safer alternative is to choose the correct length from the start.
What impact does the drain length have on the drainage capacity?
The length of the drain directly affects the area of the grate through which water flows. A longer drain = larger area = higher drainage capacity. For standard home showering, the drainage capacity of the SLEEK series (even in the 500 mm variant) is more than sufficient. Drainage capacity becomes a critical factor with rain shower heads with high flow rates (over 20 l/min) or with multiple heads used simultaneously.
Does the drain have to be the same length as the shower wall, or can it be shorter and freely placed within the shower area?
The drain can be shorter than the wall – this is a common situation especially in larger corners, where the SLEEK series does not cover the full width. Important is that the slope is properly implemented and that water from the entire shower area gravitationally flows toward the drain. If the drain does not extend to both side walls, the ends of the drain must be bordered by tiling or a finishing profile so that no gap remains where dirt can accumulate.
Conclusion: measure twice, buy once
Selecting the length of a linear shower drain is not rocket science, but it does require a bit of systematic thinking. The key parameters are always three: the actual clear width of the shower, the position of the drain, and the tile format. If you have these three things clear, selecting the correct length is straightforward.
The SLEEK linear shower drain series covers a range from 500 to 700 mm, which corresponds to standard shower corners from 70 × 70 cm to 100 × 100 cm. For larger walk-in solutions, you will need longer variants, but for most standard bathrooms, this series is ideal – a combination of professional processing, easy maintenance, and modern design in black or gun grey surface finish.
If you are unsure which model to choose for your corner, also see the article Common questions about the SLEEK linear shower drains, where you will find answers to further technical details, or follow the procedure from the article Installation of a linear shower drain step by step, where the entire process including measuring is explained practically from start to finish.
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