Planning a bathroom to Swedish standard: a practical guide

Most of what determines whether a bathroom is excellent or merely expensive is decided before any demolition begins. Layout, drainage, waterproofing approach, materials and the order of trades are planning decisions — and once the walls are open, changing them is costly. A good plan is the cheapest quality you will ever buy.

Start with water, not tiles

It is tempting to begin with the look — the tile, the vanity, the brassware. Build the plan the other way around, starting with how water moves through the room:

• Where is the floor drain, and can the floor fall cleanly to it from every wet area?
• Where are the wet zones, and which surfaces therefore need full waterproofing?
• How will pipes run so that connections stay accessible and any leak shows itself?
• Where does the ventilation come from to clear moisture after every shower?

Settle these first, and the finishes have a sound system to sit on. Settle them last, and the finishes are decoration over a compromise.

Layout and the things you cannot move

Some choices are easy to change on paper and painful to change later: moving the drain, relocating the WC, shifting a wet wall. Decide early whether the existing layout works or whether the cost of moving services is justified. A wall-hung WC, a walk-in shower, a wall-adjacent drain — each has implications for the structure and waterproofing that are best designed in from the start, not bolted on.

Choose systems, then products

Under the Swedish approach, waterproofing, tiling and painted surfaces are systems — tested combinations of components that must be used together. Decide which approved system the room will use before choosing the decorative finish, so the tile, adhesive and membrane are compatible. Pick materials suited to heavy use and humidity, and resist the false economy of substituting a cheaper component into a system that was approved as a whole.

Plan the order of trades

A wet room is built by several trades whose work must protect the next: structure and substrate, plumbing and electrical first fix, waterproofing, tiling or painting, then second fix. The sequence matters, and so do the inspection points built into it — especially the check of the waterproofing before tiling. Planning the order, with hold points for inspection, is what keeps the trades from undoing each other's work.

Decide what "done" includes

Finally, agree up front what handover means: the finished room, yes, but also the quality documents, the plumbing certificate, the electrical records, the warranties and the care instructions. Building those into the plan from day one is how you make sure they actually arrive at the end.

How M5 plans with you

We start every project with the water, the layout and the systems before we talk tiles — then build a sequence with inspection points and a defined handover. It makes the build calmer, the cost clearer, and the result something that performs for years rather than just photographing well on day one.