The residential building with commercial use as a quiet business on the ground floor is located at Bornholmer Straße 8 in 10439 Berlin-Prenzlauer Berg. It was built in 1906 as a closed masonry construction typical of the Wilhelminian period. Due to the S-shaped extension of the building, the front building, the 1. Side wing, the transverse building and the 2. Side wing with a rear building. The exterior facades and passageways are insulated to reduce heat losses. All windows / balcony doors are replaced with new plastic insulating windows according to the energy specifications of the building physicist. According to the ventilation concept according to DIN 1946-6, all windows/balcony doors of the apartments with sufficient supply air elements (window vents and ALDs in the front building) are used for controlled air exchange. The front doors are newly manufactured or repaired as carpentry according to the historical model. The attic is dismantled and rebuilt with a uniform roof pitch of DN = 60° in accordance with static specifications. For the new roof structure, a steel frame basic structure with steel pillars and overlying wooden construction (steep and flat roof rafters) is planned. The steep roof surfaces are designed as a ventilated tile roof, the flat roof areas as a warm roof with 2-layer flat roof sealing according to DIN 18531. All rainwater pipes are renewed, whereby the drainage of the roof terraces and VH balconies according to DIN 1986-100 must be managed separately from the main roof drainage. Within the roof, the 7 new utilisation units are separated by lightweight apartment partitions and massive stairwell walls. Technical building equipment: Dismantling of existing heaters, furnaces and all types of installation lines, installation of a hybrid heater (air heat pump on the roof with gas condensing boiler in the HAR), dismantling of ELT instantaneous water heaters and gas heaters), central water heating in the basement by means of a fresh water station in the flow principle (legionella prophylaxis), renewal of all kinds of distribution lines from KG technical rooms and risers according to specialist planning, new installation of CHP, WW and circulation lines and SW and the insulation of all hot water pipes. Electrical installation: The meter centralization in the KG, dismantling of existing meters in the stairwell, renewal of the electric piping and reinforcement of the main power system from the main distributions to the housing sub-distributors, according to installation condition UP / AP, renewal of the electrical system / circuits, installation of new electrical sub-distributors in the apartments including residual current protection switches (FI switches) and integrated multimedia field, separate protection for washing machine, dishwasher and stove, renewal & number of circuits, sockets and switches according to DIN / VDI guidelines, switch series after sampling, installation of a PV system on the roof (Solar Act Berlin). Type and scope of services Shell attic of this notice: Execution of the following works: demolition 350 m2 roof waterproofing + formwork demolition 250 m2 roof covering incl. roof truss room work 1965m truss roof truss room work 300 m2 attic ceiling incl. beam heads refurbish steel construction 33t steel structure roof wall work 150 m2 brick ceiling wall work 260 m2 interior wall insulation roofing 310 m2 hard covering clay roof tile roof waterproofing 490 m2 bituminous roof waterproofing roof waterproofing 37 m2 roof terraces execution period/duration: Start date: 04.11.2025, end: 26.02.2027 Evidence to be provided: Certificate of competence of the responsible site manager or supervisor in accordance with TRGS 519/521, certificate of competence TRGS 524 for employees, in accordance with the Hazardous Substances Ordinance of December 2024 Capacity: Minimum turnover of € 1.3 million net in the last 3 years per year References: 2 comparable references in the inventory with at least 850,000 € and 1 piece tower crane All services are carried out in accordance with VOB.
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