Please ask for Site Supervisor Patrick Seiler Toni Seiler Baugeschaeft AG was founded 1993 in Oberwil. The company engages about 15 employees and is a family business. Our fields of activity are both, customer masonry work, as well as building construction and civil engineering works: · Annex and modification of existing buildings · Restoration of single and multi-family houses · Add panels · All customer masonry works · Concrete refurbishment · Maintenance of common external areas (walls, front ports with composite stones, garage drive ways, perch etc.) · Road construction · Fire protection (certified processor) · Civil engineering surface · Civil engineering underground · Masonry works · Annex to existing buildings · Modifications · Restoration of single and multi-family houses · Kitchen restoration · Bath restoration · Customer mason · Exposed brickwork · Concrete refurbishment · Formwork and concrete works · Bearing walls with steel support · Fireplace restoration · Abrasions · Storefront insulation · Storefront patchwork · Storefront renovations · Storefront isolation · Plastering · Dust protection walls for dust-free constructions · Sealing of floors, walls, ceilings and joints · Winter garden fundament · Winter garden base · Exterior staircase with natural or artificial stone covering · Breakthroughs · Wall breakthroughs · Demolition · Maintenance of common external areas such as: · Walls, front ports with composite stones, garage drive ways, perch · Plant management construction · Plant management · Sewerage · Sewer rehabilitation · Composite stones · Natural stones Personal advice, professional planning and execution characterizes reflects ourselves, true and links us to our slogan "Building with Seiler".

Founded in 1807 in Basel, the construction company has been located in the traditional Gellert quarter since 1893. We build above-ground structures for industry, trade, and residential developments. Our core competencies include all craftsmanship work and site management. We coordinate all executing companies, thereby avoiding duplication of effort. Our employees specialize in: • Master builder work • Customer masonry • Conversions • Additions • Renovations • New builds • Concrete restoration • Insulations • Plasterwork • Natural stone works • Earthquake strengthening • Asbestos removal • Roof service • Drilling & milling Put us to the test; we will gladly advise you on your future construction projects. We look forward to hearing from you. Customer masonry Our customer masons are all-rounders on the construction site, both in shell construction and interior finishing. We carry out the following works for you: • Plastering • Coating work • Setting work, joint work • Tile laying • Drywall • Plastering • Attic conversion • Specialized stone masonry • Flowing screed • Abrasions, white plaster • Concrete restoration • Waterproofing Conversion / Renovations With our experienced yet innovative team we handle very complex and technically demanding construction projects. We are accustomed to working in protected heritage and occupied buildings. Conversion and renovation are multi-layered projects with high complexity. Reasons for a conversion can be: • Improving insulation / external façades of the building • Changes in floor plan • Renovation of the existing building fabric • Renovation of building services • Renovation of wet rooms (bathrooms, kitchens, etc.) • Re-purposing of the building • Safety • Earthquake strengthening • Regulatory requirements, etc. New construction New constructions in the area of residential, industrial, and commercial building. Our work is defined by thinking in terms of quality, awareness of costs, and versatility. Flexibility and adherence to deadlines are very important to us. We also place the greatest importance on quality and reliability when selecting suppliers and any subcontractors. General contracting Project management with schedule, quality, and cost guarantee. In all projects, our top priority is to pay equal attention to quality, cost, and timelines in accordance with the client’s specifications. Only when the goals in all three aspects are met can a project be considered successful. The prerequisite for this is strong project control capability, which is continually demonstrated in numerous turnkey planner mandates. Achieving the project goals on one hand through functional and aesthetically demanding architecture, and on the other hand in terms of cost and deadlines, we consider our central mission. Construction supervision Planning and building cannot be goals in themselves, because it is about optimally fulfilling the client’s needs. As a construction service provider we are committed to your wishes. But often the client does not know all possibilities and variants. We develop and procure the necessary basis for decision-making for a realizable project. Clarifications with authorities and offices, feasibility studies, project planning, detailed planning and construction supervision. We carry out construction supervision of any size. Through contacts with various contractors and suppliers, we help the client make the right selection. Daily site inspections are unavoidable for a smooth progression of your construction project. Of course, we also take on smaller areas of construction supervision: • Estimations • Awarding contracts • Work contracts • Construction supervision • Cost monitoring • Construction accounting • Handover of the finished work to the client • Acceptance of warranty works Everything the client needs to realize a construction project successfully.

Sehr zufrieden mit der Arbeit. Sehr zuverlässig und kompetent. Der Umbau unserer Wohnung entspricht total unseren Erwartungen. Können wir nur weiterempfehlen.

Prisma Bauunternehmung GmbH was founded in 2023 and has since established itself as a reliable, high-performing partner in the construction industry. Our experienced team of qualified professionals stands for the highest quality, sustainability, and a consistent customer focus. We realize new construction, renovation, and excavation projects efficiently, precisely, and on schedule. Thanks to sound expertise, modern technology, and meticulous planning, we implement individual construction projects economically and sustainably. From the initial concept to completion, we provide our clients with expert and transparent support. Our aim is to create durable, functional, and high-quality buildings.