Construction company Brunn am Gebirge just past Liesing, but under provincial law.

Why building in Brunn is not like building in Liesing

Between Atzgersdorf and the built-up area of Brunn, you hardly notice a border on the road. Legally, though, it is a clear one: on the Viennese side the Vienna Building Code applies, the building control authority is MA 37, and townscape questions end up with MA 19. A few hundred metres further on, the Province of Lower Austria sets the rules, and they are enforced by the municipality itself. This has practical consequences that many clients only notice once a plan has already been drawn.

The most important difference lies in how projects are classified. The Lower Austrian Building Code distinguishes between projects that need a building permit, those that only have to be notified to the authority, and those that require neither. A Viennese client is used to almost every change to load-bearing elements or to the external appearance going through a submission procedure. In the Mödling district the range is wider, and that is exactly why it pays to clarify the classification before the first draft. Anyone who plans too early sometimes plans for the wrong procedure.

The second difference is how close you are to the authority. In Vienna you face a large administration that works according to uniform procedures. In a market town such as Brunn or Perchtoldsdorf, the building office is small, the officials know the streets and often the history of a plot as well. That can be an advantage, because queries are answered more quickly. But it also means that local practice – for instance how strictly fences, roof shapes or outbuildings are assessed – carries more weight than the letter of the law alone.

Permit, notification or nothing at all: classification comes first

Whether a project needs a permit, needs to be notified or can be carried out freely depends not on the amount of money involved, but on what happens structurally. New builds, extensions and changes that affect structural stability, fire protection or neighbours' rights generally require a building permit in Lower Austria. This submission requires plans, a building description and, depending on the scope, an energy performance certificate and structural documents. Neighbours are involved and can raise objections insofar as the law grants them rights – for example regarding distances, building height or daylight.

In addition, there is a group of measures that must be reported to the municipality in writing beforehand. The authority then has a deadline within which it can prohibit the project or require a permit after all. Exactly which works fall into this group is laid down in the law and has changed over several amendments. We therefore do not rely on a list from memory but check with the building office before committing to a schedule. That costs a phone call and, in the worst case, saves months.

Finally, there remains a set of works that need no procedure – typically maintenance, replacing components like for like, or interior work that does not touch anything load-bearing. This is where the most common misconception lies: exempt from procedure does not mean that the Building Technology Ordinance, the OIB requirements or the distances to the neighbour do not apply. Anyone who, for example, changes the sill height when replacing a window, or whose façade insulation projects over the plot boundary, is quickly back in permit territory.

What building in Brunn am Gebirge costs in 2026

The following ranges are net guide prices for 2026 and are based on the prices on our Viennese service pages. For the Mödling district, a surcharge of 3 to 5% is added for travel, equipment and site set-up, as we also state on the page for southern and the rest of Lower Austria. A price only becomes binding after the site visit, because in houses from the seventies in particular there is often more behind the plaster and tiles than you can see from the outside.

Why the ranges are so wide can be shown with a roof. If only the covering on a terraced house is renewed, rafters, insulation and interior lining remain untouched, and the price is at the lower end. As soon as stripping reveals that the rafters at the eaves are rotten or the old mineral wool between the rafters has slumped, the re-covering turns into a roof renovation with insulation – and the price per square metre moves upwards. We therefore include open items for such findings in our quotations, instead of hiding them in a lump sum.

The travel surcharge to the south is comparatively low, because Brunn, Perchtoldsdorf and Maria Enzersdorf can be reached quickly from Vienna via Triester Straße or the A2 Südautobahn. It becomes noticeable mainly for short jobs with many trips, such as minor repairs, and on sloping sites in Gießhübl or Hinterbrühl, where not every lorry can get up to the house and material has to be brought in with smaller equipment.

Worked example: terraced house from the seventies, 120 m²

The following example is a model calculation, not an invoiced project. It shows how the costs of a typical terraced house in the Mödling district are made up when roof, windows, bathroom and building services all fall due together.

What kinds of houses stand in the Mödling district

The district's building stock is more varied than the view from the motorway would suggest. Anyone renovating should know when their house was built, because each construction period brings its own weak points and the order of work depends on them.

The largest group are the detached and terraced houses of the post-war decades. They were built at a time when plots in the south of Vienna became affordable for many families and building had to happen fast. Typical features are hollow blocks or vertically perforated bricks without additional insulation, precast concrete ceilings, flat roofs or shallow-pitched gable roofs, and windows that could by now be replaced for the second time. The building services often still date from the original construction or from a first modernisation in the nineties.

These houses have one good quality: structurally they are usually straightforward and cope well with alterations. Their weakness is thermal performance, and the fact that roof, windows, heating and bathroom are all roughly the same age. Anyone who renews only one of them will open up the same areas again later. That is why, for these houses, we almost always recommend an overall plan, even if the work is then carried out in phases over several years. We describe how the measures interact under energy-efficient renovation.

Old village centres and winegrowers' houses

Wine has been grown along the Thermenlinie for centuries, and you can see it in the village centres. In Brunn, Perchtoldsdorf or Gumpoldskirchen there are one- to two-storey houses with a carriage entrance, a narrow courtyard and a cellar originally built for barrels and the press, not for living in. These houses are built of rubble stone or mixed masonry, often without waterproofing against the ground and with timber beam ceilings above the ground floor.

The most common problem is moisture drawn up from the ground into the walls. Over the decades, later owners sealed the walls with cement plaster, emulsion paint or tiles, so the water can no longer evaporate and rises higher. Before talking about new finishes, a measurement is needed: how damp is the masonry at what height, how high is the salt content, and where is the water coming from? Only then can you decide whether a horizontal damp-proof course, hacking off impermeable plaster or improving the drainage in the courtyard is the right first step. The options are described on our page on damp-proofing masonry.

A second issue is the townscape. Many municipalities in the district have requirements for their historic centres concerning roof shape, window divisions, colour schemes and materials, some in the development plan, some in separate ordinances. A uPVC window without glazing bars, or thick external insulation that swallows the cornice, may not be permitted there. If a building is listed, the Federal Monuments Office (Bundesdenkmalamt) must also be involved. We clarify this before windows are ordered or insulation boards are costed.

New housing along the Südbahn

Since the nineties, numerous residential complexes and rows of terraced houses have been built along the Südbahn railway and at the edges of the villages. For these buildings, owners and property managers ask less often for a complete renovation than for targeted work: leaking terraces above underground car parks, balconies with flaking surfaces, cracks at junctions between precast and in-situ concrete, or the conversion of a flat after a change of ownership.

With terraces above occupied rooms or garages in particular, the cause almost never lies in the surface but in the waterproofing underneath or at the junctions with the door and balustrade. New tiles on old, cracked waterproofing only shift the damage elsewhere. The sensible approach is to open up the build-up at one point, document the layers and then decide whether a partial repair is enough or whether the build-up must be renewed down to the structural slab. How such a renovation proceeds is explained on the terrace renovation page.

In condominium complexes there is an additional legal dimension. Whether a terrace is a common part or belongs to a particular flat determines who commissions and pays for the renovation. That is a question for the condominium agreement and the property management – we can provide the structural findings, but we cannot replace the legal assessment.

At the edge of the Vienna Woods: slopes, access and slope water

West of Brunn, the land rises towards the Vienna Woods. In Perchtoldsdorf, Gießhübl, Hinterbrühl and the upper parts of Mödling and Maria Enzersdorf, many houses stand on slopes, some with driveways that are wide enough for a car but not for an articulated lorry. For a building site this means: material often has to be delivered in smaller quantities, excavated soil moved with mini excavators and dumpers, and the crane positioned so that it does not block the road for longer than permitted.

Technically, on a slope, water is the main concern. Rain falling on the plot higher up seeps through the topsoil and flows downhill over denser layers – straight against the uphill basement wall. Pressurised water builds up there at times, even if there is no groundwater nearby. Internal waterproofing alone cannot hold this back in the long term. What works is a combination of external waterproofing, a drainage layer in front of the wall and a drain that carries the water away in a controlled manner, with the discharge to be agreed with the municipality.

Where ground has to be retained, retaining walls come into play. Above a certain height and depending on their position relative to the plot boundary, they require a permit and a structural calculation by a licensed designer. The drainage behind the wall is at least as important as the wall itself. Details of how they are built can be found on the retaining wall page.

Soil, basements and damp in the Vienna Basin

East of the Thermenlinie the land becomes flat. In Vösendorf, Wiener Neudorf and the lower parts of Brunn, plots lie in the Vienna Basin, where gravel, sand and clay layers alternate. How much load the ground can bear and how high the groundwater is can differ even between two neighbouring plots. For a bathroom renovation this is irrelevant; for an extension with a basement or a new floor slab it is not.

For new foundations we therefore have a geotechnical engineer assess the ground before the structural design is fixed. Such a report costs a fraction of what wrongly sized foundations later cause in cracks and remedial work. In existing basements we distinguish between three causes of damp that are often confused: water rising by capillary action in the masonry, water pressing against the wall from outside, and condensation that forms on cool basement walls in summer when warm air is let in. Waterproofing does nothing against condensation; what helps is correct ventilation and, where necessary, insulation.

Another point concerns rainwater. For new builds and extensions, many municipalities in the district require roof water to be infiltrated or retained on your own plot. Whether a soakaway, a swale or a cistern with overflow is suitable depends on the soil and the municipality's requirements. We plan this in from the start, because a soakaway that is only installed after the garden has been laid out means twice the effort. If the basement itself is to be renovated, read on under basement renovation.

More space: extensions and additional storeys

When the family grows or a study is needed, an extension is the most common answer in the Mödling district. Moving house is expensive in the area, and many plots still have reserves – at least at first glance. Whether this reserve may actually be built on is determined by zoning, building density, type of development and the prescribed distances. With terraced houses on narrow gardens, the scope is often smaller than expected, because the permissible built-up area is already used up by the house, garage and garden shed.

That is why we do not start with a design but with a calculation: how much floor area is permitted under the development plan, how much is already built on, and how tall may the building be? Only once these figures are established is it worth asking whether a single-storey extension towards the garden or an additional storey is the better solution.

With an extension, the connection to the existing building determines the quality. Old and new foundations settle differently, and a rigid connection cracks within the first few years. A properly planned joint, adapted foundations and a well-thought-out roof junction prevent this. For an additional storey, the seventies bungalow is a rewarding candidate, provided the flat roof slab is made of reinforced concrete and is strong enough. A lightweight timber-frame structure puts considerably less load on it than brick and is weathertight within a few days. More on this on the extension and adding a storey pages.

Renovating existing buildings: roof, façade, bathroom, windows, terrace

Most of our work in the Mödling district is not about enlarging, but about renewing what is already there. The order of work matters more than any individual measure. Anyone who replaces the windows before insulating the façade puts the new windows in the wrong position in the reveal and has to rework the junctions later. Anyone who renews the bathroom before the risers will hack open the fresh tiles again when the pipes are replaced.

This sequence is not dogma. If the roof leaks, it is repaired first, whatever the plan says. But it shows why, with houses of this generation, we so often advise an overall concept that is then carried out in two or three construction phases. For the individual jobs we refer you to the specialist pages, for example on roof renovation or bathroom renovation.

Subsidies in Lower Austria

In Lower Austria there are provincial subsidies for thermal renovation and heating replacement, supplemented by federal programmes. The conditions, funding rates and deadlines change regularly, sometimes several times a year. We therefore do not give any amounts on this page, but refer you to the current guidelines of the Lower Austrian housing subsidy (NÖ Wohnbauförderung) from the Province of Lower Austria and to federal information, for example via oesterreich.gv.at.

What hardly changes over the years are the basic rules. First: timing matters. For many programmes the application, or at least a registration, must be made before work starts or before the contract is awarded. Second: as a rule, what is subsidised is a measurable effect, demonstrated by an energy performance certificate before and after the renovation. Third: usually only certain items are eligible, such as insulation, windows or the heating system, but not the new tiles in the bathroom.

For you this means: the eligible work should be shown separately in the quotation, so that you or your energy consultant can transfer it into the application without recalculating. We do this as standard. The application itself, and the assessment of which programme suits your case, belong in the hands of an energy consultant, not a construction company.

Commercial premises in Wiener Neudorf and Vösendorf

With the industrial centre in Wiener Neudorf and the retail space around Shopping City Süd in Vösendorf, the Mödling district is one of the densest business locations in Lower Austria. For businesses it is rarely about large new buildings, more often about tenant fit-outs, conversions after a change of tenant, new sanitary areas, drywall partitions, industrial floors or adapting to fire protection requirements.

Different priorities apply here than in a detached house. A shop or hall that stands idle earns no money. We therefore plan backwards from the opening or handover date, work in sections or outside operating hours if necessary, and coordinate deliveries with the site's logistics. For changes to a commercial installation, the district authority (Bezirkshauptmannschaft) may be responsible in addition to the building authority; whether an amendment approval is needed should be clarified early by the operator and designer, because the schedule depends on it. More on conversions for retail and catering can be found under converting commercial premises.

How a project with us works

The step that affects the schedule most is the third. For a bathroom renovation that needs no procedure, work can start a few weeks after the go-ahead. If a building permit is needed, several months usually pass before construction can begin, depending on how complete the documents are, the involvement of neighbours and how busy the building office is. This time cannot be shortened, but it can be put to good use – for detailed planning, selecting samples and booking dates with the partner firms.

Once approved work is finished, completion must be notified to the building authority, together with the documents the law requires for this. Depending on the project, these include confirmations of proper execution, inspection reports on the chimney and electrical installation, and an updated energy performance certificate. We collect these certificates during the construction period so that they do not have to be laboriously chased up at the end.

Licensed partners for regulated trades

Skyline Bau is a general contractor. This means we take overall responsibility for planning the sequence of work, carrying out the building work and coordinating everyone involved. In Austria, however, some work may only be carried out by firms holding a specific trade licence. This includes electrical installations, gas and water installations, heating engineering, structural calculations and the preparation of planning submission drawings. With us, these services are provided by licensed partner firms with whom we work regularly.

For you, little changes as a result: you have one contract, one contact person and one schedule in which all trades are coordinated. The partner firms issue the inspection reports and test records prescribed for their trade, which you will later need for the authority, your insurer or a sale. Who provides which service is stated in the quotation, so that there is no uncertainty about licences and liability.

For property management companies and owners' associations

In the Mödling district, many property management companies look after mixed portfolios: older residential complexes, newer developments with underground car parks and individual tenement buildings in Mödling. Different things matter to them than to detached-house owners. Decisions are made at owners' meetings or by circular resolution, and that requires documents that are easy to follow. We provide quotations broken down into items that an owners' association can compare, with photos of the findings and an explanation of why a measure is necessary.

When a building remains occupied, informing the residents is also crucial. When will the water be turned off, when will the entrance be closed, when will the noise come? We announce such dates in good time by notice and keep to local quiet hours. For property managers with several smaller jobs in the region, it is worth bundling site visits. An overview of our services for residential complexes is given on the staircase renovation page.

Neighbours, plot boundaries and the building site

In the district's housing estates, houses stand close together, gardens adjoin directly and terraced houses share a party wall. Every building site therefore also affects the neighbours. In the permit procedure they are parties and can raise certain objections. Regardless of that, it pays to inform the neighbours before work starts and to document the condition of adjoining structures if vibration is expected – for example during demolition or excavation right at the boundary.

If the neighbouring plot has to be entered for scaffolding or work, an agreement with the owner is the cleanest way. Placing skips or material on municipal roads requires a permit from the municipality. We apply for it and plan the area so that driveways and footpaths remain usable.

When in the year to build

External work such as roof, façade and terrace belongs in the months with stable temperatures, because adhesives, renders and waterproofing need a minimum temperature to be applied. Spring is particularly in demand for this, so capacity is booked up early. If you plan in autumn and complete the submission in winter, you can start in March or April. Interior work such as bathrooms, floors or drywall can be carried out all year round and often has shorter lead times in winter.

Also in these municipalities

From Brunn we work throughout the Mödling district and in the adjoining parts of Vienna. The process is the same everywhere; the differences lie in the authority, the development plan and the access.

For places further north we refer you to the page building in Klosterneuburg, and for the whole surrounding area to construction company Lower Austria.

When you do not need us

Not every project needs a general contractor. If all you need is one room painted, a parquet floor sanded or a tap replaced, a local tradesperson is usually the cheaper choice, because there is no coordination effort or travel. Working with us makes sense as soon as several trades interlock, dates have to be coordinated or an authority is involved. A bathroom in which the plumber, electrician, tiler and painter work one after another is such a case. A house in which the roof, windows and heating are all being renewed at the same time, all the more so.

Frequently asked questions about building in Brunn am Gebirge

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