Plumbing Survey Before Buying an Older Paris Apartment

None of the mandatory reports in a French property sale covers the actual condition of the plumbing. Before buying an older Paris apartment, check the pipe material, pressure, first-run water, drainage, water heater, boiler, signs of old damp and the building's risers yourself, then get a professional survey if anything looks doubtful.

About to sign a preliminary sale agreement in Paris or the inner suburbs? Call +33 1 89 70 15 36 (01 89 70 15 36 from a French phone), 7 days a week, 24 hours a day, or write to us through the contact page or WhatsApp. Many of our plumbers speak English, which helps if you are buying from abroad. Our everyday plumbing service carries out pre-purchase surveys with a written report.

In an older Paris building, plumbing can be a significant item of work, and it appears in none of the documents handed over at the sale. Here is how to assess it.

What the mandatory reports do not tell you

The technical file (dossier de diagnostic technique) provided in a French sale is useful, but none of its parts covers whether the water system actually works well:

• the lead report (diagnostic plomb) is about paint, not pipes;
• the asbestos report covers building materials;
• the energy performance rating (DPE, France's equivalent of an EPC) assesses consumption, not the condition of installations;
• the gas and electricity reports cover the safety of those installations, not water.

So you can buy a flat with spotless reports and discover after moving in that the pipes are at the end of their life, the pressure is too low or the drains are undersized.

8 checks to make on viewings

None needs technical skill, and all are revealing.

1. The visible pipe material

Look under sinks, in utility cupboards, in the bathroom. Lead pipes, dull grey and slightly soft, or rusty galvanised steel point to an old network that needs replacing. Cast-iron stacks are common in pre-war buildings. Our article on replacing lead and cast-iron pipes in Paris explains the scale of that work.

2. Pressure and flow

Turn on several taps at once, shower included. Flow that collapses as soon as two outlets run points to scaled or undersized pipes.

3. Water colour on first run

Let the cold water run after it has stood unused. Brownish or cloudy water at first means internal corrosion, a sign of pipes at the end of their life.

4. Drainage

Run plenty of water in the sink, basin and shower. Slow draining, gurgling, smells coming up: the drains are clogged or poorly vented, a bigger problem than a simple blockage.

5. The water heater's age and condition

The rating plate usually shows the year of manufacture. Look for scale or rust around the safety valve too. Our article on the signs a water heater needs replacing helps you judge.

6. The boiler

Ask for the service certificates for recent years. Their absence tells you something: an unserviced appliance breaks down more often.

7. Signs of old damp

Ceilings, wall corners, under sinks: stains, blistered paint, patch repairs. A recent, isolated repaint on a ceiling can hide water damage that was never fixed at the source.

8. The common parts

The most overlooked point, and one of the costliest. Look at the risers in the cellars or accessible ducts. An ageing communal network means works voted at the owners' general meeting, and as a future co-owner you will pay your share.

Questions for the seller and the syndic

• The seller: history of water damage, plumbing work done, with invoices if possible.
• The building's property manager (syndic), through the seller or agent: the minutes of recent general meetings and the building's maintenance log (carnet d'entretien). They reveal works voted but not yet done, studies under way on the pipes and repeat incidents. Ask about the works fund (fonds de travaux) too, which shows whether the co-ownership can pay for these jobs without a special call for funds.

Watch out: check in the preliminary agreement (compromis de vente) who pays for riser works already voted. Our article on plumbing in co-ownership buildings explains what counts as a common part.

When to get a professional survey

A careful viewing is often enough. A survey before the preliminary agreement, or a condition precedent in it, is worth it if:

• the building is old and, as far as you know, the pipes have never been renewed;
• you noticed several of the warning signs above;
• the flat has been empty for a long time;
• you plan a renovation that will touch the plumbing anyway.

What the plumber checks

• pipe materials (lead, copper, PEX, PVC, cast iron, galvanised steel);
• the condition of accessible supply risers and drain stacks;
• whether connections and outlets are up to standard;
• pressure and the meter's condition;
• the water heater;
• active leaks and signs of chronic damp.

What you receive

• a written report with photos, item by item;
• an estimate of the works by item: pipes, bringing up to standard, urgent repairs;
• a clear opinion: what is urgent, what can wait, what can be negotiated.

The cost of the survey depends on the size of the flat and the complexity of the installation. Send us the address and floor area for a quote, or see our prices for a rough idea.

Using the survey to negotiate

A documented technical finding also helps you negotiate. A report showing that the pipes will need redoing soon gives you a costed basis, far stronger than an impression from a viewing. Do not count on any recourse after signing for wear you could have seen: what is not negotiated before the deed in practice stays your cost.

Before renovating, or to improve the energy rating

If you are buying to renovate, knowing the state of the pipes before you buy lets you cost the project realistically. Redoing old pipes while the walls are open always costs less than coming back to it later. Our guide to renovating a bathroom in the right order sets out the sequence.

Hot water and heating also weigh on the energy rating (DPE). A plumber and heating engineer does not carry out the DPE, but does the work the energy audit recommends:

• the water heater: replacing an old, oversized tank with a more efficient model, or a heat pump water heater where there is room;
• lagging hot water pipes that run through false ceilings or unheated spaces;
• the communal hot water loop, in buildings that have one: pump and insulation to check;
• heating: a condensing boiler where a heat pump is not possible, or a heat pump where it is;
• flushing a sludged heating system so it regains its efficiency.

To qualify for energy renovation grants (MaPrimeRénov', energy saving certificates known as CEE), the contractor generally needs the RGE label for the work concerned. Our article on plumber certifications in France explains how to check.

FAQ

Is a plumbing survey mandatory when selling a flat in France?

No. No regulatory report covers the condition of the water system. That is why your own checks, or a voluntary survey, are useful.

How much does it cost to redo all the plumbing in an older flat?

It depends on the floor area, the number of outlets and access to the pipes. An on-site estimate before buying is worth more than a generic figure.

Should I view the flat with a plumber?

For an older property whose pipes have never been renewed, yes: they see what a buyer does not, especially in the common parts and the scale of the work.

Can the report be used to negotiate the price?

Yes, that is often its main value. A report that costs the works is a serious argument with the seller.

Can you do the work after the purchase?

Yes. After the survey, we can take on the plumbing works.

Get the plumbing checked before you sign

Réseau Tubulure carries out pre-purchase plumbing surveys in Paris and the inner suburbs (92, 93, 94), with a written, costed report. We work 7 days a week, 24 hours a day. Many of our plumbers speak English.

• Phone: +33 1 89 70 15 36 (01 89 70 15 36 from a French phone)
• Form: contact us
• WhatsApp: from the button on the site

See our everyday plumbing service.