Can I clear a blocked drain myself before calling someone?

For a local, recent blockage, a plunger or cleaning the trap is sometimes enough. If water backs up elsewhere, if several fixtures drain badly or if the blockage keeps coming back, it is better to call a professional. Avoid harsh chemical products, which can damage pipes and make the work harder afterwards.

Who pays for drain cleaning in a rented flat?

The split depends on the lease, the cause of the blockage and where it is located. A blockage in a shared stack is not treated like a sink trap clogged by the occupant. If in doubt, report the problem to the managing agent or landlord before ordering the work, unless it is an obvious emergency.

Is a camera inspection always necessary?

No. It is mainly useful when the blockage returns, when its cause is not obvious or when a damaged pipe is suspected. It lets you see the condition of the pipe rather than guess. The quote should state whether it is included and whether you will receive a report.

What warranty applies after drain cleaning?

The Code of Obligations (CO) provides five years for a defect in a building work (art. 371 CO) and two years for a movable work. Simple drain cleaning is first and foremost a service: ask in writing what the company will cover if the problem reappears. If the contract refers to the SIA 118 standard (the Swiss Society of Engineers and Architects' general conditions for construction work), it applies in addition.

What should I include in my request to get a useful quote?

State which fixture or pipe is affected, since when, whether the problem is constant or intermittent, and whether other flats are affected. Add the type of building and the access to the pipe. The more precise the description, the closer the quote will be to reality.

Drain Cleaning in French-Speaking Switzerland

A sink that empties slowly, a shower that stands full, a toilet that backs up: drain cleaning restores the flow of a blocked pipe. Depending on the case, it can be sorted in a few steps or may require specialist equipment and a diagnosis of the pipe.

This page explains what the trade covers, when to call a professional and how to prepare your request in western Switzerland. SOS Travaux is a neutral matching service: your request is passed to tradespeople and companies in the region, who contact you to prepare a free, no-obligation quote.

What drain cleaning covers

Drain cleaning means clearing a pipe that carries wastewater or rainwater. The most common situations:

a sink, washbasin or bath trap clogged by grease, hair or deposits;
a toilet pipe blocked by wipes, too much paper or a dropped object;
a shared stack in a building, affecting several homes;
a buried pipe or an inspection chamber in a garden, yard or garage blocked by roots, soil or leaves;
a rainwater downpipe or floor drain that overflows.

Methods vary with the nature of the blockage and the pipe: removing and cleaning the trap, a manual pump, a drain snake (a flexible rod or cable that breaks through or pulls out the obstruction), a blade machine for roots, and high-pressure water cleaning. A camera inspection can then be used to check the inside of the pipe.

When to call a professional

An isolated, accessible and recent blockage can be handled yourself. Call a specialist instead in the following cases:

water backs up into another fixture when you use one (for example, the shower fills up when the washing machine drains);
several water points drain badly at the same time;
the problem comes back regularly after a first cleaning;
persistent smells rise from the drains;
the backflow affects a basement, a cellar or a garage;
you do not know where the blockage is.

A blockage that keeps repeating is often not the real problem: it may point to insufficient slope, a sagging pipe, roots or a damaged pipe. A professional looks for the cause, not just the symptom.

What is different in Switzerland: training and the framework of the trade

Plumbing and sanitation trades are learned in Switzerland through vocational training, often ending in a Federal Certificate of Proficiency (CFC). A CFC attests to training, but does not replace your own checks: ask the company for its full name, its address and exactly which services the offer includes.

For simple drain cleaning, no authorisation is generally involved. Administrative questions arise when the intervention reveals a need to repair or replace a pipe: connection to public sewers, drainage of a plot and water run-off are governed by municipal and cantonal rules. Always check with your municipality or the competent cantonal service before starting work that changes the pipes.

By canton: permits, energy, heritage

Drain cleaning does not in principle require a permit or any energy-related procedure. If the inspection leads to heavier work, the framework differs from one canton to another:

Geneva: building permits are issued by the canton (Office des autorisations de construire). Many rental buildings are managed by managing agents (régies), who are the natural contact for a shared stack. The old town and protected districts may require extra precautions.
Vaud: the building permit is issued by the municipality, with the file going through the cantonal permit centre (CAMAC) when cantonal services must give an opinion. In old towns and in the Lavaux vineyards, a UNESCO World Heritage site, protection constraints exist.
Valais: the building permit is issued by the commune within the building zone, and by a cantonal commission outside it. For chalets and second homes, the federal law on second homes may apply in the communes concerned.
Fribourg: permit applications go through the cantonal FRIAC platform; the permit is issued by the prefecture or the commune depending on the type of work. The canton is bilingual and its old towns are protected.
Neuchâtel: applications go through the cantonal SATAC desk, and the decision is made by the commune. The watchmaking heritage of La Chaux-de-Fonds and Le Locle, listed by UNESCO, may influence work on the buildings concerned.
Jura: the permit is issued by the commune or the canton depending on the scale of the project. The old towns of Delémont, Porrentruy and Saint-Ursanne call for particular attention.
Biel/Bienne and the canton of Bern: the permit is issued by the municipality or the prefecture depending on the project. Biel/Bienne is officially bilingual (French and German), which may matter for the language of the quote and of exchanges.

As for energy, each canton has a dedicated service or office and a subsidy programme, but this rarely concerns simple drain cleaning. In all cases, confirm the rules that apply to your situation with the municipality or the competent cantonal service.

Preparing your drain cleaning request

A clear description avoids unnecessary visits and makes quotes comparable. Gather the following before filling in the form:

the fixture or pipe concerned (sink, toilet, shower, stack, outdoor chamber);
when the problem appeared and whether it is constant or intermittent;
what you have already tried, including any products used;
the type of building, the floor, and whether a cellar or basement is affected;
access to the pipe and to any inspection chamber;
your status: owner, co-owner or tenant. A tenant must inform their landlord or managing agent, whose agreement may be needed depending on the scale of the work.

Photos of the inspection chamber, the drain and the affected area help to frame the request. If several homes are affected, say so: the work then often falls to the co-ownership or the building owner.

What a reliable quote spells out

A clear drain cleaning quote states, in writing:

the nature of the planned work (snake, machine, high pressure, camera);
the scope: which pipe, how far, and whether access to an inspection chamber is included;
travel and labour, and how time spent is counted;
any materials or consumables charged separately;
what happens if the cause of the blockage is discovered (damaged pipe, roots): a separate proposal, with prior agreement before any additional work;
the provision of a report or images in the case of a camera inspection;
what the company will cover if the blockage reappears.

Be wary of an offer that stays vague on scope: the difference between two quotes often comes from a service that is not the same.

What makes the cost vary

No figure is possible without knowing your situation, but several factors weigh on the price:

the nature and location of the blockage (accessible trap or buried pipe);
the difficulty of access: basement, high floor, inspection chamber hard to open;
the method required and the equipment used;
whether or not a camera inspection is included;
the length of pipe to be treated;
the conditions of the intervention, notably outside normal hours;
the discovery of a pipe defect that calls for repair.

The quote, free and without obligation through SOS Travaux, remains the only way to obtain a reliable amount.

Legal warranties after the work

The Code of Obligations (CO) governs defects in work. For a building work, the warranty is five years under art. 371 CO; for a movable work, it is two years. Simple drain cleaning is closer to a service: what is owed if the problem recurs depends on what was agreed. Have the conditions for a return visit put in writing.

If the contract refers to the SIA 118 standard, it forms part of the contractual framework. Report defects as soon as you notice them, preferably in writing, and keep invoices and reports.

Drain cleaning near you

City pages for this trade are not yet available. Consult your canton’s page for local information, then request a quote:

Updated 29 October 2026