Chimney renovation Vienna without the chimney sweep's report it is guesswork.

Chimney renovation Vienna: costs 2026

Net guide values, as of 2026, per flue and up to about four storeys. Binding after report and measurement.

Unit prices and ancillary services

Chimney renovation in a detached house

In a detached house, chimney renovation is almost always the result of a heating replacement. The old chimney was built for an oil or gas boiler with a high flue gas temperature. A condensing appliance delivers 40 to 60 degrees — the flue gets wet; this is called sooting (Versottung).

In a detached house the order matters: first the chimney sweep with the report, then the decision on the heating system, then the renovation, then the appliance. Anyone who buys the appliance first may not get a sign-off.

A point many overlook: if the chimney is decommissioned because of a switch to a heat pump, it still has to be sealed tight and ventilated. Otherwise moisture is drawn into the house through the unused shaft. This costs 400 to 900 euros and is regularly forgotten.

How to recognise a chimney in need of renovation

How a chimney renovation works

Which method for which purpose

The six most common mistakes

• Condensing appliance on an old chimney. The flue gases condense and the chimney soots through from the inside. After one to three winters, brown stains appear in the apartment.
• Renovated without a report. The method does not suit the appliance, the chimney sweep does not approve – the work has to be repeated.
• Cross-section not calculated. Too large cools down, too small backs up. Both lead to faults in the appliance.
• Condensate drain forgotten. The water collects at the base of the chimney and escapes into the masonry.
• Only the inside renovated, head forgotten. Frost has its greatest effect above the roof. A crumbling head is a danger to passers-by.
• Old connection openings left open. Decommissioned connections in apartments must be sealed to fire protection standards.

Who may do what: chimney sweep, installer, building contractor

Several trades work on the chimney, and responsibilities are clearly divided. Knowing them saves you the round in which three firms refer you to each other.

Our role is that of the executing building contractor and coordinator: we take on the structural part – chimney head, masonry, roof connection, plaster, access and safety – and bring in licensed partner firms for the flue system and the heating side. The sign-off is always done by the chimney sweep.

Sooting: why old chimneys get wet

The most common damage in old Viennese buildings is sooting – brown, tarry stains that break through the wall from the inside and cannot be painted over.

The chimney head above the roof

The part of the chimney above the roof surface stands unprotected in the weather and is therefore almost always the first area to be damaged. In Vienna, many heads also still date from the time of construction.

If the head is being renewed anyway, it is worth looking at three points that are then settled for decades: a proper cowl, a cleanly executed roof connection with new sheet metal, and sufficient height above the roof surface. Retrofitting each of these later requires the same access all over again.

Which inner liner for which purpose

The cross-section is calculated, not estimated. A cross-section that is too large leads to sooting, one that is too small to flue gas backflow. The calculation costs 150 to 400 euros and is a prerequisite for approval by the chimney sweep.

The process in detail

The order of phases eight and nine is not negotiable: first the approval, then operation. Anyone who has the appliance connected beforehand has a problem with the insurance in the event of damage – and the installer will usually refuse anyway.

Typical cost traps

Decommissioning done properly

The fourth point is most often done wrong. A flue sealed airtight never dries out, and the trapped moisture works its way into the adjacent walls – the damage then looks like sooting, even though there has been no heating for years. The right solution is a cover that keeps rain out and lets air through.

Heating replacement and chimney

Most chimney renovations in Vienna today are not repairs but the result of an appliance change. What happens to the flue depends on what is newly installed.

Conversely: an existing, intact flue is an asset. Bricking it up unnecessarily during renovation takes away the building's option to connect a stove later or switch to another system. In tenement buildings with several flues, it is almost always worth keeping at least one operational.

Chimney in a tenement building: several parties, several flues

For the property management this means in concrete terms: before the next meeting, have an inventory of all flues prepared with report and cost range. Then a phased plan can be adopted instead of discussing it anew with every appliance replacement. How this interacts with the other measures on the building is explained on the tenement building renovation page.

Open fireplace, wood stove, tiled stove

Some enquiries do not come from a heating renovation but from the wish for a stove. The question is then not whether the chimney looks nice, but whether it can handle the appliance.

Then there is the supply air: a stove burns air from the room unless it is designed to be room-air independent. In tight, renovated apartments this is often not enough, and a separate supply air duct is needed. The chimney sweep also clarifies this in advance – and it is the point at which stove projects most often fail, not the chimney itself.

When the chimney runs through the loft conversion

The same question comes up with every conversion: the chimney stands in the middle of the new apartment. Three routes are common, and the decision is made in planning, not on site.

If the roof is raised, the required outlet height above the roof surface changes at the same time. The existing head is then usually too low and the extension is due anyway – a point that is regularly missing from the cost estimate of a conversion. Details on the conversion itself are on the loft conversion page.

Maintenance: what keeps the chimney going for a long time

The visual inspection of the head can be combined at no extra cost with the roof inspection that makes sense anyway. Anyone looking after a building should have both done in the same appointment – the access via rope or roof hatch is the same, and the most common damage lies exactly at this interface between chimney, sheet metal and roof covering.

Price examples from practice

Fire protection and safety

What you can prepare

• Obtain the chimney sweep's report: it is the basis for every offer and states which flue is in which condition.
• Know what is to be connected: appliance type and output determine system and cross-section.
• Survey all flues in the building: number, location, which are still used, which have been dead for years.
• Clarify access to the attic and the outlet: keys, roof hatch, existing anchor points.
• Organise access to the affected apartments: especially with connection openings in several units.
• Collect old documents: earlier reports, renovations, plans showing the chimney routing.
• Plan early: there are usually weeks between report, offer, resolution and execution.

How to recognise proper workmanship

How this differs from our other services

When you do not need us

The chimney sweep, not a building contractor, is responsible for the annual sweeping and the report. If they raise no objections and no appliance replacement is planned, there is nothing to renovate. Contact us if the report shows defects, if a new appliance is to be connected or if the chimney head is visibly deteriorating.

Chimney renovation in a detached house

In a detached house, chimney renovation is usually the result of a heating replacement: the old flue was built for an oil or gas boiler with a high flue gas temperature; the new condensing appliance needs a tight, moisture-resistant flue.

We carry out chimney renovation in Vienna and nearby Lower Austria. For the rest of Austria we do not act as an agent and tell you openly that a firm near you will be faster and cheaper.

Chimney renovation: understanding the costs before the first offer arrives

In Austria, the flue in the masonry is actually called a Rauchfang; "Kamin" is the word that came over from Germany and here often stands for the open fireplace in the living room. In renovation, both terms mean the same thing: the flue is repaired so that it is tight, frost-resistant and suitable for the connected appliance.

The costs of a chimney renovation fall into three blocks that should be considered separately. First, the diagnosis: report and camera survey together usually cost a few hundred euros and decide which method is possible at all. Second, the actual work on the flue – liner, coating or new head. Third, access to the roof, which is the biggest unknown in Vienna. A tenement building with a steep metal roof, no roof hatch and a narrow street in front needs scaffolding or a cherry picker, and for the cherry picker often a temporary no-parking zone. According to our table, this item ranges between €650 and €3,800 net and can be more expensive than the liner itself for a short chimney. Anyone comparing offers should therefore first check whether roof access is included at all.

Chimney grinding: what the method achieves and where it stops

During grinding, a rotating head with milling or grinding tools travels through the flue and removes loose joints, sooting crusts and projections. This makes the cross-section even again and creates space for what comes next. That is exactly the point many offers keep quiet about: grinding alone does not make a leaking chimney tight. It is the preparation for a mineral inner coating or an inserted liner that would otherwise not pass through narrow points.

For grinding and coating, our cost table gives €2,500 to €6,500 net per flue. The range depends on the length, the number of offsets – the angled sections common in old Viennese buildings – and how much material has to come off. Because a lot of dust is produced, all connection openings in the apartments are sealed beforehand. In a tenement building this means: every party on the same flue must be informed in advance and provide access. If a liner goes in after grinding, the method is a supplement, not an alternative.

Inserting a stainless steel liner into an old chimney: what the price per metre depends on

The inserted stainless steel liner is the most common solution when switching to a condensing appliance, because it is moisture-resistant and safely carries the condensate down. For a double-wall liner we calculate €120 to €260 net per running metre for material and insertion. Where you end up within this range is decided by four things: the diameter according to the cross-section calculation, whether the flue runs straight or is offset and therefore needs a flexible liner, whether grinding is needed beforehand and how many fittings are added for connection, cleaning door and condensate drain. A rigid liner is more robust and easier to clean; the flexible liner is the compromise for flues with offsets. Which one fits is determined by the chimney sweep in the report. If the boiler is replaced at the same time as the liner, we coordinate the appointment with the installer – more on building services on the heating and plumbing in Vienna page.

In the area around Vienna too: get an offer for chimney renovation on a detached house in Lower Austria

A large share of detached houses with old chimneys are not in Vienna but just outside, for example in Mödling, Baden, Purkersdorf, Tulln or around Korneuburg. We work there just as we do in the city. To get a reliable offer and not just a rough estimate, a few documents help: the current report or inspection record from your chimney sweep, photos of the chimney head above the roof and of the cleaning opening in the basement, the number of storeys and which heating appliance will be connected in future.

Why the appliance is so important: the diameter and material of the inner liner depend on it, as does whether a condensate drain is needed. A detached house also often has an advantage over a tenement building, because roof access via a ladder or roof window is enough and no scaffolding is needed in the courtyard. Whether your town is in our area can be seen on the construction company Lower Austria page; send documents via the enquiry form.

Frequently asked questions about chimney renovation in Vienna

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