We disclose what others keep quiet. Our GISA number is right here. Check it.
About Skyline Bau: Skyline Bau is a brand of Bling Bling GmbH — a building trade business under § 99 GewO (Austrian Trade Regulation Act), GISA 37945732. Not a licensed master builder (konzessionierter Baumeister). And we do not claim to be one.
On the Viennese construction market, “Baumeister” (master builder) appears on the business cards of firms that never obtained the licence under § 94 Z 5 GewO. That is no minor slip but a breach of § 99 Abs. 5 GewO — and it misleads clients.
We do not play along. This page sets out what we are allowed to do, what we are not allowed to do, who will be working on your site and who answers for it if things go wrong. And our GISA number, so that you can check it.
Who we are in legal terms
Skyline Bau is not a separate legal entity. It is the brand name of the construction and renovation division of Bling Bling GmbH (company register no. FN 611990k, VAT ID ATU80299348).
Bling Bling GmbH is a restricted building trade business under § 99 GewO, GISA number 37945732. All quotations, contracts, invoices and the warranty run through this company. You have one contractual partner — not five.
We are not a master builder. And we do not claim to be.
What we carry out ourselves — and what we do not
This distinction is not a formality. It determines who is standing in your flat and who is liable if damage occurs.
Our own people
Stripping-out, demolition, drywall construction, screed, waterproofing to ÖNORM B 3407, floor build-ups, painting and filling work, site logistics, site management (operational control).
Licensed partner firms
Master builder services (§ 94 Z 5): structural engineering, preparation of plans, submission to the building authority (MA 37), construction supervision. Electrical engineering (§ 94 Z 16). Gas and plumbing (§ 94 Z 25). Tiling (§ 94 Z 38).
What you gain from it
Clear responsibilities. You know who is liable for what. You receive the partner firms’ proof of licence before the contract is signed — not only when you ask for it.
Site management is not statutory construction supervision
Two terms that are constantly confused — even by contractors who ought to know better.
- Statutory construction supervision (Bauführung) (§ 94 Z 5 GewO) — the legal responsibility towards the building authority MA 37: compliance with the Vienna Building Code, the OIB guidelines and the Austrian standards (ÖNORMs). The responsible supervisor signs the notice of completion. Only a licensed master builder may do this. We bring in a partner firm for it.
- Site management (Bauleitung) (not a regulated trade) — operational control: scheduling, sequencing of trades, material logistics, quality control, handovers, defect management. This is done by our own people, every day.
Reference: Austrian Parliament Building, Vienna
- Parliament Building, Vienna 1010 — renovation 2022 — On the second basement level of the Austrian Parliament Building (Dr.-Karl-Renner-Ring 3), Skyline Bau carried out drywall, painting and filling work as well as floor upgrades. Regulated trades — electrical engineering (§ 94 Z 16) and tiling (§ 94 Z 38) — were carried out by licensed partner firms. Client: W+R Schirmungstechnik GmbH. Reference letter dated 17.10.2022. View PDF
- What this proves — Security requirements, access controls, tight time windows and a handover inspection that lets nothing slip through. A team that passes there can also handle an occupied period apartment building with 30 households.
- And what it does not prove — It has not made us a licensed master builder. There, too, the regulated trades were handled by authorised partner firms. That is not a weakness; it is how the law is structured.
Why we disclose this
Because you should be able to check it.
Anyone who puts “Baumeister” on their website without holding the licence has no interest in you knowing the difference. We do have that interest. Because once you know which authorisation is needed for what, you can scrutinise every quotation — ours included.
And then the winner is not whoever shouts “master builder” the loudest, but whoever produces the paperwork.
What you receive before signing the contract
1. The GISA number
37945732. Publicly searchable in GISA, the Austrian trade register — checked in thirty seconds. A firm that is unwilling to give you its number has a reason for it.
2. The partners’ proof of licence
For structural engineering, electrics, gas/plumbing and tiling. Before the contract is signed — not on request, not later.
3. The fixed price under ÖNORM B 2110
With a bill of quantities that also lists what is not included. Variations only with your written consent.
Our location
Bling Bling GmbH · Skyline Bau brand
FN 611990k · ATU80299348 · GISA 37945732
Contact details in the legal notice
We work in all 23 districts of Vienna. The district says little about the price but a great deal about the building fabric — and that is what determines the effort involved.
How an enquiry works with us
So that you know what happens after you click send, here is the path from first contact to quotation.
- Your enquiry: Use the enquiry form to describe what it is about and attach photos. A few sentences are enough.
- Follow-up questions: If something essential is missing, we get back to you with specific questions instead of guessing a lump-sum figure.
- Site visit: On site we take measurements and clarify which work we carry out ourselves and where a licensed partner firm is required.
- Quotation: You receive a bill of quantities with quantities, unit prices and a list of what is not included.
What you should send us
The more we can see in advance, the more accurate even the first estimate will be. Helpful items are:
- photos of every affected room, plus close-ups of damage, connections and meters
- existing plans, including old planning submission drawings or a simple sketch with dimensions
- details of the floor, lift, access and whether the property is occupied
- for multi-occupancy buildings: who is placing the order – owner, property management or owners' association
- your preferred date and any fixed deadlines such as moving in or a change of tenant
Who carries out which work and which documents you receive before the contract is signed is set out further up this page. An overview of all our work can be found under Services.
Frequently asked questions about Skyline Bau
Who is Skyline Bau?
Is Skyline Bau a master builder (Baumeister)?
What does Skyline Bau carry out itself?
What do the licensed partner firms do?
Where can I find your trade licence?
What references do you have?
Who is my contractual partner?
Why do you disclose all of this?
How do I get a quotation?
Related services
Building and cleaning from a single source.
Our construction services are rounded off by the post-construction clean from our partner company Bling Premium Reinigung — timed to the handover date. More at bling-bling.at.
Send enquiry
Free site visit anywhere in Vienna. Fixed price after measurement. Written enquiries answered within 2 working days.
Check us out. And everyone else too.
GISA 37945732. Publicly searchable. Thirty seconds.
Legal notice: Skyline Bau is the brand name of the construction and renovation division of Bling Bling GmbH (FN 611990k, ATU80299348) and not a separate legal entity. The sole contracting party is Bling Bling GmbH — a restricted building trade business under § 99 GewO, GISA 37945732, not a licensed master builder.
Under § 99 (5) GewO, the title “Baumeister” (master builder) is reserved exclusively for licensed businesses under § 94 Z 5 GewO. Regulated trades — master builder services (§ 94 Z 5), electrical engineering (§ 94 Z 16), gas and plumbing (§ 94 Z 25), tiling (§ 94 Z 38) — are carried out exclusively by authorised, licensed partner firms.