House-building glossary: technical terms from A to Z
62 terms around prefabricated houses, construction costs and the construction process — concisely explained, with references to the relevant guides and calculators.
A
- Ancillary construction costs (Baunebenkosten)
- Ancillary construction costs are all expenses around the house build that go beyond the pure building costs of the house itself. They include real estate transfer tax, notary and land register fees, development and surveying costs, the building permit and insurance. They often amount to 15 to 20 percent of the total costs and should be firmly planned into your financing. House-building costs at a glance See also: House connection costs (Hausanschlusskosten), Development / servicing (Erschließung), Real estate transfer tax (Grunderwerbsteuer)
B
- Building handover (Bauabnahme)
- At the building handover, you as the client confirm that the construction company has essentially delivered its work in accordance with the contract. It is a legally significant step, because it starts the warranty period and triggers the due date of the final payment. When in doubt, bring in an independent building surveyor to identify defects early. Guide: Building Handover & Warranty See also: Handover protocol (Abnahmeprotokoll), Warranty (Gewährleistung), Works contract (Werkvertrag)
- Building application (Bauantrag)
- The building application is the formal request for a building permit, submitted to the building supervisory authority. It includes, among other things, the site plan, construction drawings, structural calculations and the drainage plan. As a rule, an architect or civil engineer authorised to submit building documents must sign the application.See also: Building permit (Baugenehmigung), Development plan (Bebauungsplan), HOAI (fee scale for architects and engineers)
- Building permit (Baugenehmigung)
- The building permit is the official authorisation to carry out a construction project in accordance with the submitted plans. It is granted by the responsible building supervisory authority on the basis of the building application and checks conformity with the development plan and building regulations. Without a valid permit, you may generally not start building.See also: Development plan (Bebauungsplan), Building application (Bauantrag), Development / servicing (Erschließung)
- Blower door test (Blower-Door-Test)
- The blower door test is an airtightness measurement used to detect leaks in the building envelope. A fan creates positive and negative pressure and the air change is measured. For efficiency houses and subsidised KfW projects, proof of airtightness is generally mandatory.See also: Efficiency House (Effizienzhaus), Vapour barrier (Dampfbremse), U-value (U-Wert)
- Basement (Keller)
- The basement is a storey located wholly or partly below ground that creates additional usable or living space. It causes extra costs and requires load-bearing, ideally dry ground, which is why a soil survey is recommended. A plain floor slab is a possible alternative.See also: Floor slab (Bodenplatte), Soil survey (Bodengutachten), Shell / structural build (Rohbau)
C
- Construction specification (Baubeschreibung)
- The construction specification is the detailed description of works and materials that forms a binding part of the construction contract. It defines which building components, fittings and qualities are owed and serves as the benchmark for the later building handover. The more concrete the construction specification, the lower the risk of additional charges and disputes. Guide: Reviewing the Construction Contract See also: Construction contract (Bauvertrag), Sample selection (Bemusterung), Works contract (Werkvertrag)
- Construction financing (Baufinanzierung)
- Construction financing bundles the equity and loans with which you pay for the plot and the house build. Key levers are the interest rate, repayment, fixed-interest period and the amount of equity, which significantly influences the conditions. A careful stocktake of your finances and comparing several offers protect you from expensive wrong decisions. Construction Financing Calculator See also: Land charge (Grundschuld), Ancillary construction costs (Baunebenkosten), Funding (Förderung)
- Construction contract (Bauvertrag)
- The construction contract governs the contractual rights and obligations between you and the construction company, in particular the scope of works, price, deadlines and payment schedule. Since 2018, statutory consumer construction contract law has protected clients through, among other things, a mandatory construction specification and a right of withdrawal. Have the contract expertly reviewed before signing. Guide: Reviewing the Construction Contract See also: Works contract (Werkvertrag), Construction specification (Baubeschreibung), Building handover (Bauabnahme)
- Construction schedule (Bauzeitenplan)
- The construction schedule sets out the timing of all construction phases from excavation to handover. It serves as a control tool to coordinate trades, monitor deadlines and identify delays early. A binding construction schedule should be part of your construction contract. Guide: House-building Process See also: Construction contract (Bauvertrag), Shell / structural build (Rohbau), Topping-out ceremony (Richtfest)
D
- Development plan (Bebauungsplan)
- The development plan is a municipal statute that bindingly defines how a plot may be built on. It regulates, among other things, the type and extent of building use, the number of storeys, roof shape, building lines and sometimes colour or material requirements. Check it before buying a plot, as it can considerably restrict your design freedom. Plot prices 2026 See also: Building permit (Baugenehmigung), Land register (Grundbuch), Development / servicing (Erschließung)
- DIY work (Eigenleistung)
- DIY work, colloquially called a "sweat mortgage" (Muskelhypothek), refers to construction work that you carry out yourself instead of hiring tradespeople. It can noticeably reduce construction costs and is partly recognised by banks as a substitute for equity. Estimate the time required and your own ability realistically, as mistakes are expensive to correct later.See also: Shell-completion house (Ausbauhaus), Kit house (Bausatzhaus), Construction financing (Baufinanzierung)
- Development / servicing (Erschließung)
- Development, or servicing, ensures that a plot is connected to the road, sewer system, water, electricity and other utilities. A distinction is made between transport-related development and technical servicing with supply and disposal lines. The costs are usually borne by the plot owner and can amount to several tens of thousands of euros. Servicing a plot See also: House connection costs (Hausanschlusskosten), Ancillary construction costs (Baunebenkosten), Plot / building land (Grundstück)
- Drywall construction (Trockenbau)
- Drywall construction comprises non-load-bearing structures made of boards and stud frames, for example for walls, suspended ceilings or sloping roofs. It works without mortar or concrete, is quick to erect and provides space for insulation and installations. In prefabricated construction, drywall is a key component of the interior fit-out.See also: Interior fit-out (Innenausbau), Vapour barrier (Dampfbremse), Screed (Estrich)
E
- Efficiency House (Effizienzhaus)
- The Efficiency House is an energy standard set by the KfW that describes the energy demand of a building relative to a statutory reference building. The lower the figure, for example Efficiency House 40, the lower the energy demand and the higher the possible funding. The standard covers both the primary energy demand and the quality of the building envelope. Funding at a glance See also: KfW (state development bank), KfW 40 house (KfW-40-Haus), GEG (Building Energy Act)
- Energy certificate (Energieausweis)
- The energy certificate documents the energy quality of a building and classifies it into efficiency classes from A+ to H. For new builds, a demand-based certificate is created from the building data and must be presented on sale or rental. It helps you realistically assess the expected energy demand.See also: GEG (Building Energy Act), Efficiency House (Effizienzhaus), U-value (U-Wert)
- Energy consultant (Energieberater)
- An energy consultant plans and supervises energy-efficient new-build and renovation projects and issues the certificates required for funding. For many KfW and BAFA programmes, involving a certified expert is a prerequisite. They support you in choosing insulation, heating technology and funding. Funding at a glance See also: KfW (state development bank), Funding (Förderung), iSFP (individual renovation roadmap)
F
- Fit-out quality (Ausstattungsqualität)
- Fit-out quality describes the level of the materials and components installed, from floor coverings and sanitary fittings to building services. It has a strong effect on the price, living comfort and long-term value of your house and is defined in concrete terms during the sample selection. Always compare quotes on the basis of the same fit-out standards.See also: Sample selection (Bemusterung), Construction specification (Baubeschreibung), Show home (Musterhaus)
- Floor slab (Bodenplatte)
- The floor slab is the continuous, usually steel-reinforced concrete slab that serves as the base and foundation of the house. It transfers the building loads into the ground and also forms the floor of the ground floor if no basement is built. Its dimensioning is based on the soil survey and the structural analysis of the building.See also: Soil survey (Bodengutachten), Basement (Keller), Shell / structural build (Rohbau)
- Funding (Förderung)
- Funding consists of state grants or low-interest loans that financially support energy-efficient and age-appropriate building. Besides the KfW, the BAFA as well as individual federal states and municipalities also provide funds for new builds, heating replacement and accessibility. As a rule, submit funding applications before construction begins so as not to lose your entitlement. Funding at a glance See also: KfW (state development bank), Efficiency House (Effizienzhaus), Energy consultant (Energieberater)
- Floor plan (Grundriss)
- The floor plan is the scaled top view of a storey and shows the arrangement of rooms, walls, doors and windows. It is the basis for planning the living space and significantly influences living comfort, daylighting and later flexibility of use. Look for short routes, sensible zoning and sufficient storage areas.See also: Ground floor (Erdgeschoss), Living area (Wohnfläche), Sample selection (Bemusterung)
- Full storey (Vollgeschoss)
- A full storey is a storey that, under the state building regulations, has a certain minimum height over a sufficient share of its area. The permitted number of full storeys is set in the development plan and significantly determines the building volume. Attic storeys count as a full storey only under certain conditions.See also: Development plan (Bebauungsplan), Ground floor (Erdgeschoss), Roof pitch (Dachneigung)
G
- Ground floor (Erdgeschoss)
- The ground floor is the storey of a building located at the level of the surrounding terrain. It often houses the open living areas such as the kitchen, dining and living room and is particularly important in barrier-free planning. The permitted floor level may be prescribed by the development plan.See also: Floor slab (Bodenplatte), Floor plan (Grundriss), Development plan (Bebauungsplan)
- GEG (Building Energy Act)
- The Building Energy Act (Gebäudeenergiegesetz, GEG) consolidates the energy requirements for new and existing buildings in Germany. Since 2024 it stipulates, among other things, that new heating systems must increasingly be operated with renewable energies, and it defines minimum standards for thermal protection. For the new build of a prefabricated house, the GEG is decisive for insulation and heating technology. GEG for prefabricated houses 2026 See also: Efficiency House (Effizienzhaus), Heat pump (Wärmepumpe), Energy certificate (Energieausweis)
- General contractor (Generalunternehmer)
- A general contractor takes on the complete construction work from a single source and in turn engages the individual trades as subcontractors. For you as the client there is only one contractual partner, which simplifies coordination and warranty. Unlike the property developer, the general contractor builds on the plot you have already acquired.See also: Property developer (Bauträger), Works contract (Werkvertrag), Turnkey (Schlüsselfertig)
H
- Handover protocol (Abnahmeprotokoll)
- At the building handover, the handover protocol documents the condition of the building along with all identified defects and outstanding works. It is a key piece of evidence, because the handover starts the warranty period and shifts the burden of proof onto you as the client. Make sure to record every defect in writing and to sign the protocol only after careful inspection. Guide: Building Handover & Warranty See also: Building handover (Bauabnahme), Warranty (Gewährleistung), Notice of defects (Mängelrüge)
- House connection costs (Hausanschlusskosten)
- House connection costs arise for connecting your building to the public networks for electricity, water, sewage, gas and telecommunications. They are part of the development and are billed by the respective utility providers. Depending on the distance to the main lines, several thousand euros per connection may be incurred. Servicing a plot See also: Development / servicing (Erschließung), Ancillary construction costs (Baunebenkosten), Plot / building land (Grundstück)
- House catalogue (Hauskatalog)
- A house catalogue presents a provider's house types, floor plans and fit-out lines in one place. It serves as an initial orientation to compare construction methods, price ranges and design options. Catalogues are usually free and can be requested digitally or in print. Request house catalogues See also: Show home (Musterhaus), Prefabricated house (Fertighaus), Floor plan (Grundriss)
- HOAI (fee scale for architects and engineers)
- The Fee Scale for Architects and Engineers (Honorarordnung für Architekten und Ingenieure, HOAI) provides the framework for remunerating planning services. It divides projects into nine service phases from establishing the basics to project supervision. Since 2021, the fee tables have been non-binding and serve only as guidance, so fees can be freely agreed.See also: Building application (Bauantrag), Construction contract (Bauvertrag), General contractor (Generalunternehmer)
- Heat pump (Wärmepumpe)
- A heat pump extracts heat from the environment — from air, ground or groundwater — and raises it to a usable temperature level using electrical energy. It is regarded as a key technology for climate-friendly heating and meets the GEG requirements for renewable energies. Combined with underfloor heating and photovoltaics, it works particularly efficiently. GEG for prefabricated houses 2026 See also: GEG (Building Energy Act), Underfloor heating (Fußbodenheizung), Photovoltaics (Photovoltaik)
I
- Interior fit-out (Innenausbau)
- The interior fit-out comprises all works carried out inside the house after the shell is completed. These include screed, drywall, electrical and sanitary installation, tiling, interior doors as well as painting and flooring work. With a shell-completion house, you carry out parts of the interior fit-out yourself.See also: Shell / structural build (Rohbau), Screed (Estrich), Shell-completion house (Ausbauhaus)
- iSFP (individual renovation roadmap)
- The individual renovation roadmap (individueller Sanierungsfahrplan, iSFP) is a document prepared by energy consultants that shows step by step which energy measures make sense for an existing building. It primarily concerns renovations, but can increase the funding rate for accompanied measures. It is not required for new builds, but is often financially attractive for modernisers. Funding at a glance See also: GEG (Building Energy Act), Energy consultant (Energieberater), Funding (Förderung)
K
- Kit house (Bausatzhaus)
- A kit house is delivered as a prefabricated kit that you assemble yourself with extensive DIY work. It is the most cost-effective variant of prefabricated construction, but requires considerable practical skill and a large amount of time. The manufacturer provides the materials, construction plans and usually assembly instructions.See also: Shell-completion house (Ausbauhaus), Prefabricated house (Fertighaus), DIY work (Eigenleistung)
- KfW (state development bank)
- The KfW is a state development bank that grants low-interest loans and subsidies for energy-efficient building and renovation. For new builds, the programmes for efficiency houses and climate-friendly new construction are particularly relevant. The funding is tied to certain energy standards and usually to construction supervision by experts. Funding at a glance See also: Efficiency House (Effizienzhaus), KfW 40 house (KfW-40-Haus), Funding (Förderung)
- KfW 40 house (KfW-40-Haus)
- A KfW 40 house requires only about 40 percent of the primary energy of a statutory reference building and is therefore one of the most efficient new-build standards. It meets high requirements for insulation, airtightness and building services and is a prerequisite for many KfW funding programmes. A heat pump, ventilation system and photovoltaics are usually used. House type: KfW 40 house See also: Efficiency House (Effizienzhaus), KfW (state development bank), Heat pump (Wärmepumpe)
L
- Land register (Grundbuch)
- The land register is a public register that documents the ownership and legal status of a plot. It records, among other things, owners, encumbrances such as land charges, as well as rights of way or utility easements. Only with the entry in the land register do you become the legal owner of the property.See also: Land charge (Grundschuld), Real estate transfer tax (Grunderwerbsteuer), Notary (Notar)
- Land charge (Grundschuld)
- The land charge is a real property lien with which a property is encumbered as security for a loan. It is entered in the land register and entitles the bank to initiate a forced sale in the event of default. As a flexible security instrument, it remains in place even after repayment until it is deleted or used again. Construction Financing Calculator See also: Land register (Grundbuch), Construction financing (Baufinanzierung), Notary (Notar)
- Living area (Wohnfläche)
- The living area refers to the floor space of living rooms that is countable under the Living Space Ordinance (Wohnflächenverordnung). Areas under sloping roofs or in basements are counted only partially or not at all, which is why it differs from the gross floor area. It is an important comparison figure for price, running costs and living comfort.See also: Floor plan (Grundriss), Full storey (Vollgeschoss), Ground floor (Erdgeschoss)
N
- Notice of defects (Mängelrüge)
- With a notice of defects, you notify the construction company in writing of an identified building defect and demand rectification. It should describe the defect precisely, set a reasonable deadline and be documented for evidentiary reasons. If the company does not respond, further rights such as a price reduction or substitute performance may apply. Guide: Building Handover & Warranty See also: Warranty (Gewährleistung), Building handover (Bauabnahme), Handover protocol (Abnahmeprotokoll)
- Notary (Notar)
- The notary notarises the plot or property purchase contract, which is legally required in Germany. They ensure a legally secure process, arrange land register entries and neutrally safeguard the interests of both contracting parties. The notary fees are among the ancillary construction costs and depend on the purchase price.See also: Land register (Grundbuch), Real estate transfer tax (Grunderwerbsteuer), Ancillary construction costs (Baunebenkosten)
P
- Property developer (Bauträger)
- A property developer erects a house on a plot it owns and sells you the plot and the building together as a turnkey package. The purchase is governed by the Estate Agent and Property Developer Ordinance (Makler- und Bauträgerverordnung), which provides for instalment payments according to construction progress. Unlike a works contract, here you acquire a finished property from a single source.See also: Works contract (Werkvertrag), Turnkey (Schlüsselfertig), General contractor (Generalunternehmer)
- Prefabricated house (Fertighaus)
- A prefabricated house is produced in a factory from prefabricated components and assembled on site within a short time. This industrial prefabrication enables predictable costs, high quality standards and short construction times. Depending on the completion stage, prefabricated houses are available as turnkey, shell-completion or kit houses. Discover all houses See also: Solid house (Massivhaus), Turnkey (Schlüsselfertig), Shell-completion house (Ausbauhaus)
- Plot / building land (Grundstück)
- The plot is the spatially delimited area of land on which your house is built. Location, shape, soil condition and degree of development significantly influence both the price and the buildability. Before buying, check the development plan, the land register and any soil survey. Plot prices 2026 See also: Development / servicing (Erschließung), Development plan (Bebauungsplan), Soil survey (Bodengutachten)
- Photovoltaics (Photovoltaik)
- A photovoltaic system converts sunlight directly into electricity and reduces your energy costs for the household and heat pump. Combined with a battery storage system, you increase self-consumption and become more independent of the grid. For many Efficiency House standards, such a system is effectively a prerequisite. Funding at a glance See also: Heat pump (Wärmepumpe), Efficiency House (Effizienzhaus), Smart Home
R
- Roof pitch (Dachneigung)
- The roof pitch is the angle of the roof relative to the horizontal, given in degrees. It affects the appearance, the drainage of rain and snow, the usable roof space and the suitability for photovoltaics. The development plan often prescribes the permitted roof shapes and pitch ranges.See also: Development plan (Bebauungsplan), Photovoltaics (Photovoltaik), Shell / structural build (Rohbau)
- Real estate transfer tax (Grunderwerbsteuer)
- Real estate transfer tax is due on the purchase of a plot or property and is levied by the federal states. Depending on the state, the tax rate is between 3.5 and 6.5 percent of the purchase price. It is one of the ancillary construction costs, and only after it has been paid does the clearance certificate enable the entry in the land register. Plot prices 2026 See also: Ancillary construction costs (Baunebenkosten), Land register (Grundbuch), Notary (Notar)
S
- Shell-completion house (Ausbauhaus)
- With a shell-completion house, the manufacturer erects the house only up to an agreed shell condition, while you carry out part of the interior fit-out yourself. Typical DIY works include painting, floor coverings or the interior finishing of walls and ceilings. This lowers construction costs, but requires practical skill and sufficient time. House type: Shell-completion house See also: Kit house (Bausatzhaus), Turnkey (Schlüsselfertig), DIY work (Eigenleistung)
- Sample selection (Bemusterung)
- During the sample selection you choose the specific fit-out of your house, such as tiles, floor coverings, doors, sanitary objects and heating technology. It often takes place in a show home or the provider's sample selection centre and directly affects the final price. Clarify in advance which fittings are included in the base price and where surcharges arise.See also: Construction specification (Baubeschreibung), Show home (Musterhaus), Fit-out quality (Ausstattungsqualität)
- Soil survey (Bodengutachten)
- A soil survey, also called a ground survey, examines the load-bearing capacity, composition and groundwater level of the building ground. It provides the basis for planning the foundation and floor slab and reveals risks such as contamination or pressing water. Without a soil survey, you risk expensive rectifications and, in the event of damage, problems of proof.See also: Floor slab (Bodenplatte), Basement (Keller), Development / servicing (Erschließung)
- Screed (Estrich)
- Screed is the load-bearing or floating floor layer applied on the structural slab that forms the base for the later floor covering. It often accommodates the pipes of the underfloor heating and must dry sufficiently before laying the covering. Drying times that are too short lead to moisture damage and cracks.See also: Shell / structural build (Rohbau), Underfloor heating (Fußbodenheizung), Interior fit-out (Innenausbau)
- Solid house (Massivhaus)
- A solid house is built stone by stone from mineral building materials such as brick, sand-lime brick or concrete. It is considered particularly durable and value-stable and offers good sound and fire protection as well as a high heat storage capacity. Unlike the prefabricated house, it is mostly built directly on site.See also: Prefabricated house (Fertighaus), Shell / structural build (Rohbau), U-value (U-Wert)
- Show home (Musterhaus)
- A show home is a fully furnished display house in which providers let you experience the construction method, floor plans and fit-out variants. It helps you get a feel for the spatial effect, material quality and technology before you decide. Note that show homes are often presented with a higher-end fit-out that may involve surcharges. House type: Show home See also: Prefabricated house (Fertighaus), Sample selection (Bemusterung), House catalogue (Hauskatalog)
- Shell / structural build (Rohbau)
- The shell comprises the load-bearing and bracing components of a house such as the foundation, walls, ceilings and roof truss. Once completed, the building is weatherproof but not yet habitable, as the interior fit-out follows. The completion of the shell is often celebrated with the topping-out ceremony. Guide: House-building Process See also: Interior fit-out (Innenausbau), Topping-out ceremony (Richtfest), Floor slab (Bodenplatte)
- Smart Home
- A smart home is a residential building in which technology such as heating, lighting, shading and security is networked and controlled automatically. The systems can be operated via app, voice or time schedule and can optimise energy consumption. Planning the wiring early during the shell stage saves later retrofitting costs. Smart home in a prefabricated house See also: Photovoltaics (Photovoltaik), Heat pump (Wärmepumpe), Interior fit-out (Innenausbau)
- Structural analysis (Statik)
- Structural analysis calculates the load-bearing capacity and stability of a building under all expected loads. A structural engineer prepares the structural calculations, which are part of the building application and determine the dimensioning of load-bearing components. Faulty structural analysis endangers safety and must be checked before construction begins.See also: Building application (Bauantrag), Floor slab (Bodenplatte), Shell / structural build (Rohbau)
T
- Topping-out ceremony (Richtfest)
- The topping-out ceremony is a traditional occasion that marks the completion of the shell and the roof truss. It serves as a thank-you to the tradespeople involved in the build and as a small milestone in the construction process. Customarily, the client invites everyone for a drink while the topping-out speech is read out.See also: Shell / structural build (Rohbau), Construction schedule (Bauzeitenplan), Roof pitch (Dachneigung)
- Turnkey (Schlüsselfertig)
- A turnkey house is handed over by the provider ready for occupancy, so you can move in directly after the handover. The exact scope of works follows from the construction specification, as turnkey is not a legally fixed term. Therefore, check carefully which works, such as outdoor facilities or floor coverings, are actually included. Guide: Reviewing the Construction Contract See also: Shell-completion house (Ausbauhaus), Construction specification (Baubeschreibung), Prefabricated house (Fertighaus)
U
- Underfloor heating (Fußbodenheizung)
- Underfloor heating emits heat over a large area through the floor and works with low flow temperatures. It works especially well with heat pumps and is therefore standard in modern efficiency houses. Its advantages are an even heat distribution and the absence of visible radiators.See also: Heat pump (Wärmepumpe), Screed (Estrich), Efficiency House (Effizienzhaus)
- U-value (U-Wert)
- The U-value, also called the thermal transmittance coefficient, indicates how much heat is lost through a component, measured in watts per square metre and kelvin. The lower the value, the better the insulating effect of a wall, roof or window. It is a key figure for energy efficiency and for meeting the GEG requirements.See also: Efficiency House (Effizienzhaus), GEG (Building Energy Act), Vapour barrier (Dampfbremse)
V
- Vapour barrier (Dampfbremse)
- A vapour barrier is a film or membrane that regulates the passage of water vapour from the interior into the insulation, thereby preventing moisture damage. It must be sealed airtight and bonded professionally to avoid condensation and mould in the structure. In timber construction it is a key component of moisture protection.See also: Blower door test (Blower-Door-Test), U-value (U-Wert), Efficiency House (Effizienzhaus)
W
- Warranty (Gewährleistung)
- The warranty obliges the construction company to remedy defects within the statutory period, which for buildings is generally five years from handover. If a defect appears, you should report it in writing and set a reasonable deadline for rectification. After the period expires, you bear the risk of hidden defects yourself. Guide: Building Handover & Warranty See also: Building handover (Bauabnahme), Notice of defects (Mängelrüge), Handover protocol (Abnahmeprotokoll)
- Works contract (Werkvertrag)
- The works contract obliges the contractor to produce a specific work, while you owe the agreed remuneration. In house building it is the legal basis when you commission a construction firm to build on your own plot. Key effects such as handover, warranty and the due date of payment are governed by works contract law. Guide: Reviewing the Construction Contract See also: Construction contract (Bauvertrag), Building handover (Bauabnahme), General contractor (Generalunternehmer)
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