Heating. Plumbing. Air Conditioning.

The clearest example is the combination of insulation and heating. A building's heat load follows from its envelope. If the facade or the basement ceiling is insulated first, the heat demand drops and the heat pump can be sized smaller. Anyone who replaces the system before insulating pays for capacity that is no longer needed afterwards, and runs it for years outside its most efficient range.

Dependencies like this exist in every project. Electrical cables have to be in the wall before drywall and plaster are closed up. The circuits of underfloor heating belong beneath the Estrich (floor screed), and the Estrich needs its drying time before tiles or parquet follow. If one step is brought forward, the next company opens up again what the previous one has just finished.

With separate contracts, the scheduling risk lies with you. If the Estrich slips by a week, you have to reschedule the tiler, the painter and the plumber. In our projects we carry that programme forward ourselves and move the following trades without you having to make a single phone call.

The second difference concerns liability. A damp patch next to the new shower tray can originate in the waterproofing, in the installation or in the Estrich. With four contracts, this is where the discussion about who caused it begins. With one contract, working that out is our job, not yours.

Funding also follows a sequence: the application and the placing of the order have to happen in the right order, and at the end the funding bank requires a Fachunternehmererklaerung (a specialist contractor's declaration) covering the measures carried out. We issue this evidence for the trades we have built.

From a single source means, for us: heating, plumbing, air conditioning and ventilation, electrical installations, drywall, Estrich (floor screed), painting, and the insulation of facade, roof and basement ceiling. Energy advice with an individueller Sanierungsfahrplan (individual refurbishment roadmap) is added to that. A flat refurbishment or the refurbishment of a period building is therefore covered in full as a rule, from strip out to the final coat of paint.

We draw the line where a different qualification is required. Interventions in load-bearing structures need a structural engineer, listed facades need clarification with the Landesdenkmalamt (the state heritage authority), and a geothermal borehole needs a permit under water law. We bring these specialists and permits into the project, but we do not pretend to replace them. We deliberately do not carry out internal insulation, because in Berlin's existing buildings the moisture risk often outweighs the benefit.

Not every project needs a main contractor. A heating service, hydraulic balancing or swapping the bath for a shower remain individual jobs that you can enquire about directly from the list on this page.

It starts with an appointment at the property. Without measuring up on site there is no reliable price, so we record the existing condition, the pipe and cable routes and the state of the installations ourselves and set them out in a report. From that comes a quotation with fixed items that names the trades involved and their sequence.

Once you place the order you receive a programme of works and a fixed point of contact for the construction period. Technical responsibility on site lies with the operations manager, a master heating engineer.

At the end we carry out the handover together. You receive documentation of the work carried out, test reports and the settings of the installed systems, plus the documents you need for funding, for the property manager or for later servicing.