Brown water in the morning, a pinhole leak in a copper pipe or a weak shower are familiar signs of ageing pipework. If you own a detached house in Finland, replacing the domestic water pipes (käyttövesiputkien uusiminen) is your own decision, and a well-planned job sorts the problem out in one go. This guide covers when the pipes are worth replacing, what the job includes, how long it takes and what affects the cost.
Domestic water pipes are the cold and hot water pipes running from the water meter to the taps (faucets) and other water points. Drains and heating pipes are separate systems and are not covered here.
When should the water pipes be replaced?
Water pipes last for decades, but not forever. A lifespan of 30–50 years is often quoted as a rule of thumb, but the real condition depends on the material, the water quality and the installation. The oldest houses often have galvanised steel pipes, which rust from the inside and gradually narrow the bore. Later, copper became the most common material, and its typical weakness is pitting corrosion, which causes tiny holes in the pipe wall.
Replacement is worth considering if you notice any of these signs:
- the water is brown or yellowish, especially in the morning or after you have been away
- the pressure has dropped at several water points, even though the tap aerators have been cleaned
- you have had pinhole leaks, or there is moisture and greenish oxidation on the joints
- the pipes are original and have not been replaced in decades
If only the hot water is brown, the cause may also be the water heater.
A single leak does not mean the whole system needs replacing; it can be fixed as a small plumbing job. Once leaks start to recur, full replacement often makes more sense than repeated patching and the risk of water damage. Also check your home insurance: many policies reduce the compensation for leaks from old pipework with an age deduction (ikävähennys).
Surface-mounted or concealed pipes?
New pipes can be installed in two ways, and you can combine them in the same house, for example surface-mounted pipes in the utility room and concealed pipes in the living areas.
Surface-mounted pipes (pinta-asennus) are fixed to the surface of the wall or ceiling. In living areas they can be boxed in or run behind a trim or panel. Little needs to be opened up, and any leak is noticed straight away.
Concealed pipes (uppoasennus) use a pipe-in-pipe system (putki-putkeen): the water pipe runs inside the structures in a protective sleeve pipe, typically from a manifold straight to the water point. The system is built so that any leaking water becomes visible, and a pipe can usually be replaced without opening up the structures.
| Feature | Surface-mounted | Concealed (pipe-in-pipe) |
|---|---|---|
| Where the pipes run | On the wall or ceiling, boxed in if needed | Inside the structures in a sleeve pipe |
| Building work | Little demolition and patching | Walls and floors are opened and closed |
| Spotting a leak | Visible on the pipe itself | Leaking water is directed into view |
| Appearance | Pipes or boxing are visible | No pipes in sight |
| Time and cost | Usually quicker and more affordable | Usually slower and more expensive |
| Best suited | When you want to avoid demolition | As part of a larger renovation |
Surface-mounted pipes are usually copper or composite pipe; concealed systems normally use PEX or composite pipe. Copper joints are soldered or made with press fittings, and soldering is hot work, for which the installer holds a hot work card (Tulityökortti). There is more about materials on our water pipe replacement page.
What does the job include?
The scope is always agreed for each house, but replacing the water pipes in a detached house usually goes like this:
- Survey and plan. The existing pipes and water points are checked, and the pipe routes, material and installation method are agreed.
- Water shut-off. The water is shut off at the water meter. When the new pipes are built first, the water is off mainly while the connections are switched over.
- New main lines from the water meter onwards: cold and hot water, the water heater connections and, where needed, a hot water circulation line.
- Branches to the water points: kitchen, bathroom, toilet, washing machine, dishwasher and outdoor tap.
- Shut-off and angle valves for each fixture, so a single tap can later be replaced without shutting off the water to the whole house.
- Pressure test (painekoe) before the system is put into use and before the pipes are boxed in or covered up.
- Flushing, commissioning and records. Every water point is checked. Keep the details of the materials, pipe routes and pressure test, plus photos taken before the pipes were covered.
Old pipes are removed or, if they run inside the structures, cut off and capped. No dead ends where water stands still should be left in the system.
The water meter belongs to the water utility (HSY in the Helsinki region), so removing or moving it is agreed with the utility. The service pipe from the plot boundary to the house (tonttivesijohto) is the owner's responsibility, but replacing it is separate groundwork. Permit practices vary between municipalities, so ask your local building control (rakennusvalvonta) in advance before any major changes.
How long does repiping a house take?
The duration depends on the size of the house, the number of water points and the installation method, so the schedule is agreed for each job. As a rough guide, replacing the water pipes in an ordinary detached house with surface-mounted pipes usually takes a few working days. Concealed pipes, opening up structures and boxing-in add time. If the pipes are replaced as part of a bathroom renovation, the whole project often takes weeks, because waterproofing, tiling and drying times take time of their own.
You can usually live in the house throughout. The water shut-offs are agreed in advance, but keep some water aside for drinking and cooking anyway.
Wet rooms and waterproofing
If a new pipe route goes through the wall or floor of a bathroom or other wet room, the job also affects the waterproofing. Damaged waterproofing is repaired according to the instructions of the waterproofing system's manufacturer, and pipe penetrations are sealed with the system's own penetration collars. That is why as few new penetrations as possible should be made into wet rooms.
Waterproofing is done by a qualified specialist, and there is a separate personal certification for wet-room waterproofers in Finland. Waterproofing, tiling and closing up structures are not part of the plumbing work; they are ordered separately.
What affects the cost of repiping?
There is no single fixed price for replacing water pipes, because two detached houses are rarely the same. The price is given as a quote after a site visit, and these factors affect it the most:
- Number of water points. Every tap, shower, toilet, washing machine and outdoor tap means its own branch, joints and valve.
- Pipe routes and length. Floors, a basement, a crawl space or the attic affect the routes, and pipes in cold spaces must be insulated against freezing.
- Installation method and material. Concealed pipes require more building work, and materials differ in both cost and installation time.
- Opening and closing structures. Demolition, boxing-in, patching and painting are often separate jobs.
- Wet rooms. If the waterproofing has to be touched, waterproofing and tiling work are added.
- Extra work done at the same time. Replacing taps or the toilet, for example, is worth doing while the water is off anyway.
The household tax credit lowers the cost
Replacing the water pipes in your detached house qualifies for the household tax credit (kotitalousvähennys). The credit is 35% of the labour cost, with a threshold (omavastuu) of €150 and a maximum of €1,600 per person per year. Because labour is a large share of a pipe renovation, the credit can reach the maximum, and if spouses pay the invoice together, each can claim the share they paid. Materials do not qualify, so ask for the labour part to be itemised in the quote and on the invoice.
The credit belongs to the year in which you pay the invoice. The government has proposed a temporary increase for 2026–2027, so check the current figures on vero.fi. Worked examples are in our household tax credit guide.
Terraced houses and flats: usually the housing company's job
In terraced and apartment buildings owned by a housing company (taloyhtiö), the domestic water pipes are usually the company's maintenance responsibility, and the pipes of the whole building are replaced in a pipe renovation (linjasaneeraus), the company's own project. Work that is the housing company's responsibility does not qualify for the tax credit. Plumbing work in your own flat needs a renovation notice (muutostyöilmoitus) to the housing company.
A detached house can also be owned through a housing company, for example a company of separate houses (erillistaloyhtiö). The split of responsibilities then follows the company's articles of association (yhtiöjärjestys), so check them before you order the work.
Summary
- Replace the water pipes when leaks keep recurring, the water is discoloured or the pressure has dropped and the pipes have not been renewed in decades.
- Surface-mounted pipes are usually quicker and more affordable; concealed pipes suit a larger renovation.
- The cost depends most on the water points, pipe routes, building work and wet rooms.
- The labour part qualifies for the household tax credit.
If the pipes in your house are nearing the end of their life, see our water pipe replacement page and contact us. At the site visit we go through the pipe routes and options, and you receive a quote with the labour part itemised.